View MCF5272_6942765.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

coldfire ? microcontrollers freescale.com MCF5272 coldfire ? integrated microprocessor user?s manual MCF5272um rev. 3 03/2007

overview coldfire core hardware multiply/accumulate (mac) unit local memory debug support system integration module (sim) interrupt controller chip-select module sdram controller dma controller module ethernet module universal serial bus (usb) physical layer interface controller (plic) queued serial peripheral interface (qspi) module timer module uart modules general-purpose i/o module pulse-width modulation (pwm) module signal descriptions bus operation appendix b: buffering and impedence matching index appendix a: list of memory maps 1 2 3 4 5 7 8 9 10 11 12 13 14 15 16 17 18 19 a 6 20 b ind 21 23 22 ieee 1149.1 test access port (jtag) mechanical data electrical characteristics
overview coldfire core hardware multiply/accumulate (mac) unit local memory debug support system integration module (sim) interrupt controller chip-select module sdram controller dma controller module ethernet module universal serial bus (usb) physical layer interface controller (plic) queued serial peripheral interface (qspi) module timer module uart modules general-purpose i/o module pulse-width modulation (pwm) module signal descriptions bus operation appendix b: buffering and impedence matching index appendix a: list of memory maps 1 2 3 4 5 7 8 9 10 11 12 13 14 15 16 17 18 19 a 6 20 b ind 21 23 22 ieee 1149.1 test access port (jtag) mechanical data electrical characteristics
MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor v list of figures figure page number title number 1-1 MCF5272 block diagram ....................................................................................................... .1-2 2-1 coldfire pipeline........................................................................................................... .......... 2-2 2-2 coldfire multiply-accumulate f unctionality diagram.............................................................. 2-3 2-3 coldfire programming model ................................................................................................. 2 -5 2-4 condition code register (ccr).............................................................................................. 2 -6 2-5 status register (sr) ........................................................................................................ ....... 2-8 2-6 vector base register (vbr) .................................................................................................. .2-8 2-7 organization of integer data formats in data registers ...................................................... 2-10 2-8 organization of integer data formats in address registers................................................. 2-10 2-9 memory operand addressing ............................................................................................... 2-11 2-10 exception stack frame form................................................................................................ 2 -27 3-1 coldfire mac multiplication and accumulation ...................................................................... 3-1 3-2 mac programming model....................................................................................................... 3-2 4-1 sram base address register (rambar) ............................................................................. 4-3 4-2 rom base address register (rombar).............................................................................. 4-5 4-3 instruction cache block diagram............................................................................................ 4 -8 4-4 cache control register (cacr) ........................................................................................... 4-12 4-5 access control register format (acrn) .............................................................................. 4-14 5-1 processor/debug module interface......................................................................................... 5-1 5-2 pstclk timing ............................................................................................................... ....... 5-2 5-3 example jmp instruction output on pst/ddata .................................................................. 5-5 5-4 debug programming model .................................................................................................... 5 -6 5-5 address attribute trigger register (aatr)............................................................................. 5-7 5-6 address breakpoint registers (ablr, abhr)........................................................................ 5-9 5-7 configuration/status register (csr) .................................................................................... 5-10 5-8 data breakpoint/mask registers (dbr and dbmr) ............................................................. 5-12 5-9 program counter breakpoint register (pbr) ....................................................................... 5-13 5-10 program counter breakpoint mask register (pbmr)........................................................... 5-13 5-11 trigger definition register (tdr).......................................................................................... 5-14 5-12 bdm serial interface timing ................................................................................................ .5-17 5-13 receive bdm packet ......................................................................................................... ... 5-18 5-14 transmit bdm packet ........................................................................................................ ... 5-18 5-15 bdm command format ........................................................................................................ 5 -20 5-16 command sequence diagram.............................................................................................. 5-21 5-17 rareg / rdreg command format .......................................................................................... 5-22 5-18 rareg / rdreg command sequence...................................................................................... 5-22 5-19 wareg / wdreg command format ......................................................................................... 5-23 5-20 wareg / wdreg command sequence .................................................................................... 5-23 5-21 read command/result formats ........................................................................................... 5-24 5-22 read command sequence ................................................................................................... 5-24
MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 vi freescale semiconductor list of figures (continued) figure page number title number 5-23 write command format....................................................................................................... 5-25 5-24 write command sequence .................................................................................................. 5-26 5-25 dump command/result formats.......................................................................................... 5-27 5-26 dump command sequence................................................................................................... 5-27 5-27 fill command format ......................................................................................................... 5-28 5-28 fill command sequence...................................................................................................... 5-29 5-29 go command format............................................................................................................ 5-29 5-30 go command sequence....................................................................................................... 5-29 5-31 nop command format.......................................................................................................... 5-30 5-32 nop command sequence ..................................................................................................... 5-30 5-33 rcreg command/result formats......................................................................................... 5-30 5-34 rcreg command sequence ................................................................................................. 5-31 5-35 wcreg command/result formats ........................................................................................ 5-31 5-36 wcreg command sequence ................................................................................................ 5-31 5-37 rdmreg bdm command/result formats .............................................................................. 5-32 5-38 rdmreg command sequence............................................................................................... 5-32 5-39 wdmreg bdm command format.......................................................................................... 5-33 5-40 wdmreg command sequence .............................................................................................. 5-33 5-41 recommended bdm connector ........................................................................................... 5-41 6-1 sim block diagram ........................................................................................................... ...... 6-1 6-2 module base address register (mbar)................................................................................. 6-4 6-3 system configuration register (scr) .................................................................................... 6-5 6-4 system protection register (spr).......................................................................................... 6- 6 6-5 power management register (pmr) ...................................................................................... 6-7 6-6 activate low-power register (alpr) ................................................................................... 6-10 6-7 device identification register (dir) ...................................................................................... 6- 11 6-8 watchdog reset reference regi ster (wrrr) ..................................................................... 6-12 6-9 watchdog interrupt reference register (wirr)................................................................... 6-12 6-10 watchdog counter register (wcr)...................................................................................... 6-13 6-11 watchdog event register (wer).......................................................................................... 6-13 7-1 interrupt controller block diagram.......................................................................................... 7-2 7-2 interrupt control register 1 (icr1) ......................................................................................... 7-4 7-3 interrupt control register 2 (icr2) ......................................................................................... 7-5 7-4 interrupt control register 3 (icr3) ......................................................................................... 7-5 7-5 interrupt control register 4(icr4) .......................................................................................... 7-5 7-6 interrupt source register (isr)............................................................................................. .. 7-6 7-7 programmable interrupt transition register (pitr) ............................................................... 7-7 7-8 programmable interrupt wakeup register (piwr)................................................................. 7-8 7-9 programmable interrupt vector register (pivr)..................................................................... 7-9 8-1 chip select base registers (csbrn) ..................................................................................... 8-3 8-2 chip select option registers (csorn) ................................................................................. 8-5 9-1 sdram controller signals.................................................................................................... .. 9-2 9-2 54-pin tsop sdram pin definition....................................................................................... 9-3 9-3 sdram configuration register (sdcr).................................. ............................................... 9-6
MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor vii list of figures (continued) figure page number title number 9-4 sdram timing register (sdtr)............................................................................................ 9-8 9-5 example setup time violation on sdram data input during write ..................................... 9-12 9-6 timing refinement with inverted sdclk.............................................................................. 9-13 9-7 timing refinement with true cas latency and inverted sdclk ........................................ 9-13 9-8 timing refinement with effective cas latency.................................................................... 9-14 9-9 sdram burst read, 32-bit port, page miss, access = 9-1-1-1 ........................................... 9-16 9-10 sdram burst read, 32-bit port, page hit, access = 5-1-1-1 .............................................. 9-17 9-11 sdram burst write, 32-bit port, page miss, access = 7-1-1-1 ........................................... 9-18 9-12 sdram burst write, 32-bit port, page hit, access = 3-1-1-1 .............................................. 9-19 9-13 sdram refresh cycle........................................................................................................ .. 9-20 9-14 enter sdram self-refresh mode......................................................................................... 9-21 9-15 exit sdram self-refresh mode ........................................................................................... 9-22 10-1 dma mode register (dmr) .................................................................................................. 10 -2 10-2 dma interrupt register (dir)............................................................................................... .10-4 10-3 dma source address register (dsar)................................................................................ 10-5 10-4 dma destination address regi ster (ddar) ......................................................................... 10-6 10-5 dma byte count register (dbcr) ....................................................................................... 10-6 11-1 ethernet block diagram ..................................................................................................... ... 11-2 11-2 fast ethernet module block diagram ................................................................................... 11-2 11-3 ethernet frame format...................................................................................................... ... 11-4 11-4 ethernet address recognition flowchart. ............................................................................. 11-7 11-5 ethernet control register (ecr)......................................................................................... 11- 11 11-6 interrupt event register (eir)............................................................................................. 11-12 11-7 interrupt mask register (eimr) ......................................................................................... 11- 13 11-8 interrupt vector status register (ivsr) .............................................................................. 11-14 11-9 receive descriptor active register (rdar) ....................................................................... 11-15 11-10 transmit descriptor active register (tdar) ...................................................................... 11-16 11-11 mii management frame register (mmfr) ......................................................................... 11-17 11-12 mii speed control register (mscr).................................................................................. 11-18 11-13 fifo receive bound register (frbr) .............................................................................. 11-19 11-14 fifo receive start register (frsr)................................................................................. 11-20 11-15 transmit fifo watermark (tfwr).................................................................................... 11-21 11-16 fifo transmit start register (tfsr) ................................................................................. 11-22 11-17 receive control register (rcr) ................................... ........................................... ........... 11- 23 11-18 maximum frame length register (mflr).......................................................................... 11-24 11-19 transmit control register (tcr) ........................................................................................ 11- 25 11-20 ram perfect match address low (malr).......................................................................... 11-26 11-21 ram perfect match address high (maur) ........................................................................ 11-27 11-22 hash table high (htur) ................................................................................................... 11-28 11-23 hash table low (htlr) .................................................................................................... 11-29 11-24 pointer-to-receive descriptor ring (erdsr)..................................................................... 11-30 11-25 pointer-to-transmit descriptor ring (etdsr) .................................................................... 11-31 11-26 receive buffer size (emrbr) ............................................................................................ 11- 32 11-27 receive buffer descriptor (rxbd) ...................................................................................... 11-3 5
MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 viii freescale semiconductor list of figures (continued) figure page number title number 11-28 transmit buffer descriptor (txbd)..................................................................................... 11- 37 12-1 the usb ?tiered star? topology........................................................................................... 12 -2 12-2 usb module block diagram.................................................................................................. 1 2-3 12-3 usb frame number register (fnr) .................................................................................... 12-9 12-4 usb frame number match regi ster (fnmr)....................................................................... 12-9 12-5 usb real-time frame monitor register (rfmr)............................................................... 12-10 12-6 usb real-time frame monitor matc h register (rfmmr)................................................. 12-11 12-7 usb function addr ess register (far)............................................................................... 12-11 12-8 usb alternate settings register (asr) .............................................................................. 12-12 12-9 usb device request data 1 r egister (drr1) ................................................................... 12-13 12-10 usb device request data 2 register (drr2) ................................................................... 12-13 12-11 usb specification number regi ster (specr) ............. ........................................... ........... 12-14 12-12 usb endpoint 0 status register (ep0sr).......................................................................... 12-14 12-13 usb endpoint 0 in configuration register (iep0cfg) ...................................................... 12-15 12-14 usb endpoint 0 out configurat ion register ..................................................................... 12-16 12-15 usb endpoint 1?7 configuration register.......................................................................... 12-16 12-16 usb endpoint 0 control register (ep0ctl)....................................................................... 12-17 12-17 usb endpoint 1-7 control register (epnctl) ................................................................... 12-20 12-18 usb endpoint 0 interrupt mask (ep0imr) and general/endpoint 0 interrupt registers (ep0isr) ....................................................... 12-22 12-19 usb endpoints 1?7 interrupt status registers (epnisr)................................................... 12-25 12-20 usb endpoint 1-7 interrupt mask registers (epnimr) ...................................................... 12-26 12-21 usb endpoint 0-7 data registers (epndr) ....................................................................... 12-27 12-22 usb endpoint 0-7 data present registers (epndpr) ....................................................... 12-28 12-23 example usb configuration desc riptor structure .............................................................. 12-29 12-24 recommended usb line interface..................................................................................... 12-36 12-25 usb protection circuit .................................................................................................... .... 12-37 13-1 plic system diagram........................................................................................................ ... 13-2 13-2 gci/idl receive data flow .................................................................................................. 13-3 13-3 gci/idl b-channel receive data register demultiplexing.................................................. 13-4 13-4 gci/idl transmit data flow ................................................................................................. 13-4 13-5 gci/idl b data transmit register multiplexing.................................................................... 13-5 13-6 b-channel unencoded and hdlc encoded data ................................................................ 13-6 13-7 d-channel hdlc encoded and unencoded data. ............................................................... 13-7 13-8 d-channel contention ....................................................................................................... ... 13-8 13-9 gci/idl loopback mode ...................................................................................................... 13-9 13-10 periodic frame interrupt .................................................................................................. ... 13-10 13-11 plic internal timing signal routing ................................................................................... 13-1 2 13-12 plic clock generator ...................................................................................................... ... 13-12 13-13 b1 receive data registers p0b1rr?p3b1rr .................................................................. 13-15 13-14 b2 receive data registers p0b2rr ? p3b2rr ................................................................ 13-16 13-15 d receive data registers p0drr?p3drr ....................................................................... 13-16 13-16 b1 transmit data registers p0b1tr?p3b1tr.................................................................. 13-17 13-17 b2 transmit data registers p0b2tr?p3b2tr.................................................................. 13-17
MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor ix list of figures (continued) figure page number title number 13-18 d transmit data registers p0dtr?p3dtr ....................................................................... 13-18 13-19 port configuration registers (p0cr?p3cr) ...................................................................... 13-18 13-20 loopback control register (plcr)..................................................................................... 13-20 13-21 interrupt configuration registers (p0icr?p3icr).............................................................. 13-20 13-22 periodic status registers (p0psr?p3psr)....................................................................... 13-22 13-23 aperiodic status register (pasr) ........... ........................................... ................................ 13-2 3 13-24 gci monitor channel receive regi sters (p0gmr?p3gmr) ............................................. 13-24 13-25 gci monitor channel transmit registers (p0gmt?p3gmt) ............................................. 13-25 13-26 gci monitor channel transmit abort register (pgmta) ................................................... 13-26 13-27 gci monitor channel transmit status register (pgmts).................................................. 13-27 13-28 gci c/i channel receive registers (p0gcir?p3gcir) ................................................... 13-28 13-29 gci c/i channel transmit registers (p0gcit?p3gcit) ................................................... 13-29 13-30 gci c/i channel transmit status register (pgcitsr)...................................................... 13-30 13-31 d-channel status register (pdcsr) ................................................................................. 13-31 13-32 d-channel request registers (pdrqr) ............................................................................ 13-32 13-33 sync delay registers (p0sdr?p3sdr) ............................................................................ 13-33 13-34 clock select register (pcsr) ............................................................................................ 13 -34 13-35 port 1 configuration register (p1cr)................................................................................. 13-36 13-36 port 1 interrupt configuration register (p1icr) ................................................................. 13-37 13-37 isdn soho pabx example .............................................................................................. 13-38 13-38 standard idl2 10-bit mode ................................................................................................ 1 3-39 13-39 isdn soho pabx example .............................................................................................. 13-40 13-40 standard idl2 10-bit mode ................................................................................................ 1 3-41 13-41 two-line remote access ................................................................................................... 1 3-41 13-42 standard idl2 8-bit mode .................................................................................................. 13-42 14-1 qspi block diagram ......................................................................................................... .... 14-2 14-2 qspi ram model............................................................................................................. ..... 14-5 14-3 qspi mode register (qmr) ................................................................................................. 14 -9 14-4 qspi clocking and data transfer example........................................................................ 14-10 14-5 spi modes timing........................................................................................................... .... 14-11 14-6 qspi delay register (qdl yr) ........................................................................................... 14-11 14-7 qspi wrap register (qwr) ............................................................................................... 14-1 2 14-8 qspi interrupt register (qir) ............................................................................................. 1 4-13 14-9 qspi address register ...................................................................................................... . 14-14 14-10 qspi data register ........................................................................................................ .... 14-14 14-11 command ram registers (qcr0?qcr15) ....................................................................... 14-15 15-1 timer block diagram........................................................................................................ ..... 15-2 15-2 timer mode registers (tmr0?tmr3).................................................................................. 15-3 15-3 timer reference registers (t rr0?trr3) ........................................................................... 15-4 15-4 timer capture registers (tc ap0?tcap3) .......................................................................... 15-4 15-5 timer counter (tcn0?tcn3) ............................................................................................... 15- 4 15-6 timer event registers (ter 0?ter3)................................................................................... 15-5 16-1 simplified block diag ram ................................................................................................... ... 16-1 16-2 uart mode registers 1 (umr1n)........................................................................................ 16-4
MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 x freescale semiconductor list of figures (continued) figure page number title number 16-3 uart mode register 2 (umr2n) ......................................................................................... 16-6 16-4 uart status registers (usrn) ............................................................................................ 16- 7 16-5 uart clock-select register s (ucsrn) ............................................................................... 16-8 16-6 uart command registers (ucrn) ..................................................................................... 16-9 16-7 uart receiver buffer (urbn)............................................................................................ 16-1 0 16-8 uart transmitter buffers (utbn) ...................................................................................... 16-11 16-9 uart input port change registers (uipcrn) ................................................................... 16-11 16-10 uart auxiliary c ontrol registers (uacrn) ....................................................................... 16-12 16-11 uart interrupt status/mask regi sters (uisrn/uimrn)..................................................... 16-13 16-12 uart divider upper registers (udun) .............................................................................. 16-14 16-13 uart divider lower register s (udln)............................................................................... 16-14 16-14 uart autobaud upper registers (uabun)........................................................................ 16-14 16-15 uart autobaud lower registers (uabln) ........................................................................ 16-14 16-16 uart transmitter fifo regist ers (utfn) ......................................................................... 16-15 16-17 uart receiver fifo registers (urfn) ............................................................................. 16-16 16-18 uart fractional precis ion divider control regist ers (ufpdn).......................................... 16-17 16-19 uart input port registers (uipn) ...................................................................................... 16-1 7 16-20 uart output port command regi sters (uop1/uop0) ..................................................... 16-18 16-21 uart block diagram showing external and internal interface signals ............................. 16-18 16-22 uart/rs-232 interface ..................................................................................................... . 16-19 16-23 clocking source diagram ................................................................................................... 16-20 16-24 transmitter and receiver functi onal diagram.................................................................... 16-22 16-25 transmitter timing ........................................................................................................ ...... 16-23 16-26 receiver timing ........................................................................................................... ....... 16-24 16-27 automatic echo ............................................................................................................ ....... 16-27 16-28 local loop-back ........................................................................................................... ...... 16-27 16-29 remote loop-back .......................................................................................................... ... 16-28 16-30 multidrop mode timing diagram ......................................................................................... 16-2 9 16-31 uart mode programming flowchart (sheet 1 of 5) .......................................................... 16-30 17-1 port a control register (pacnt).......................................................................................... 17 -3 17-2 port b control register (pbcnt).......................................................................................... 17 -5 17-3 port d control register (pdcnt) ......................................................................................... 17- 8 17-4 port a data direction register (paddr) ............................................................................ 17-10 17-5 port b data direction register (pbddr) ............................................................................ 17-10 17-6 port c data direction regist er (pcddr)...................... ........................................... ........... 17-11 17-7 port x data register (padat, pbdat, and pcdat) ......................................................... 17-11 18-1 pwm block diagram (3 identical modules)........................................................................... 18-1 18-2 pwm control registers (pwcrn) ........................................................................................ 18-3 18-3 pwm width register (pwwdn)............................................................................................ 18-4 18-4 pwm waveform exampl es (pwcrn[en] = 1)...................................................................... 18-4 19-1 MCF5272 block diagram with signal interfaces................................................................... 19-2 20-1 internal operand representation.......................................................................................... 20 -5 20-2 MCF5272 interface to various port sizes............................................................................. 20-5 20-3 longword read; ebi = 00; 32-bit por t; internal termination................................................ 20-8
MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor xi list of figures (continued) figure page number title number 20-4 word write; ebi = 00; 16-/32-bit por t; internal termination ................................................. 20-9 20-5 longword read with address setup; ebi = 00 ; 32-bit port; internal termination................ 20-9 20-6 longword write with address setup; ebi = 00; 32-bit port; internal termination .............. 20-10 20-7 longword read with address hold; ebi = 00; 32-bit port; internal termination................ 20-10 20-8 longword write with address hold; ebi = 00; 32-bit port; internal termination ................ 20-11 20-9 longword read; ebi = 00; 32-bit port; term inated by ta with one wait state ................ 20-11 20-10 longword read; ebi=11; 32-bit por t; internal termination................................................ 20-12 20-11 word write; ebi=11; 16/32-bit por t; internal termination .................................................. 20-13 20-12 read with addre ss setup; ebi=11; 32-bit port; in ternal termination................................. 20-14 20-13 longword write with address setup; ebi=11; 32-bit port; internal termination ................ 20-14 20-14 read with addre ss hold; ebi=11; 32-bit port; inte rnal termination................................... 20-15 20-15 longword write with addres s hold; ebi=11; 32-bit port; in ternal termination .................. 20-15 20-16 longword read with address setup and address hold; ebi = 11; 32-bit port, internal termination ......................................................................... 20-16 20-17 longword write with address setup and address hold; ebi = 11; 32-bit port, internal termination ......................................................................... 20-17 20-18 example of a misaligned longword transfer...................................................................... 20-18 20-19 example of a misaligned word transfer ............................................................................. 20-18 20-20 longword write access to 32-bit port terminated with tea timing................................. 20-20 20-21 master reset timing ....................................................................................................... .... 20-22 20-22 normal reset timing ....................................................................................................... ... 20-23 20-23 software watchdog timer reset timing ............................................................................ 20-24 20-24 soft reset timing ......................................................................................................... ...... 20-25 21-1 test access port block diagram........................................................................................... 21 -2 21-2 tap controller state machine............................................................................................... 21-3 21-3 output cell (o.cell) (bc?1) ................................................................................................ .. 21-4 21-4 input cell (i.cell). observe only (bc?4)................................................................................ 21- 5 21-5 output control cell (en.cell) (bc?4) .................................................................................... 21- 5 21-6 bidirectional cell (io.ce ll) (bc?6)........................................................................................ .21-6 21-7 general arrangement for bidirectional pins.......................................................................... 21-6 21-8 bypass register ............................................................................................................ ........ 21-8 22-1 MCF5272 pinout (196 mapbga) ......................................................................................... 22-1 22-2 196 mapbga package dimensions (case no. 1128a-01) .................................................. 22-2 23-1 clock input timing diagram................................................................................................. .23-5 23-2 general input timing requirements ..................................................................................... 23-7 23-3 read/write sram bus ti ming.............................................................................................. 23- 9 23-4 sram bus cycle terminated by ta ................................................................................... 23-10 23-5 sram bus cycle terminated by tea................................................................................. 23-11 23-6 reset and mode select/hiz conf iguration timing.............................................................. 23-12 23-7 real-time trace ac timing................................................................................................ 23 -13 23-8 bdm serial port ac timing................................................................................................. 2 3-13 23-9 sdram signal timing ........................................................................................................ 23-15 23-10 sdram self-refresh cycle timing .................................................................................... 23-16 23-11 mii receive signal timing diagram.................................................................................... 23-17
MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 xii freescale semiconductor list of figures (continued) figure page number title number 23-12 mii transmit signal timing diagram................................................................................... 23-18 23-13 mii async inputs timing diagram ....................................................................................... 23-1 9 23-14 mii serial management channel timing diagram .............................................................. 23-20 23-15 timer timing .............................................................................................................. ......... 23-21 23-16 uart timing............................................................................................................... ........ 23-22 23-17 idl master timing......................................................................................................... ...... 23-23 23-18 idl slave timing.......................................................................................................... ....... 23-25 23-19 gci slave mode timing ..................................................................................................... . 23-26 23-20 gci master mode timing .................................................................................................... 23-27 23-21 general-purpose i/o port timing........................................................................................ 23- 28 23-22 usb interface timing ...................................................................................................... .... 23-29 23-23 ieee 1149.1 (jtag) ti ming.......................................... ................................ ...................... 2 3-30 23-24 qspi timing............................................................................................................... ......... 23-31 23-25 pwm timing................................................................................................................ ........ 23-32 b-1 buffering and termination................................................................................................... ....b-2
MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor xiii table of contents paragraph page number title number chapter 1 overview 1.1 MCF5272 key feat ures ....................................................................................................... .......... 1-1 1.2 MCF5272 archit ecture ....................................................................................................... ........... 1-4 1.2.1 version 2 coldfire core .................................................................................................. ... 1-4 1.2.2 system integration module (sim) ...................................................................................... 1-5 1.2.2.1 external bus interface .......................................................................................... 1-5 1.2.2.2 chip select and wait state generation ................................................................. 1-5 1.2.2.3 system configuration and protection ................................................................... 1-5 1.2.2.4 power manageme nt .............................................................................................. 1-6 1.2.2.5 parallel input/out put ports ................................................................................... 1-6 1.2.2.6 interrupt i nputs ..................................................................................................... 1- 6 1.2.3 uart modul e .............................................................................................................. ...... 1-6 1.2.4 timer modul e ............................................................................................................. ........ 1-7 1.2.5 test access port ......................................................................................................... ........ 1-7 1.3 system design ............................................................................................................. ................. 1-7 1.3.1 system bus conf iguration ................................................................................................. .1-7 1.4 MCF5272-specific f eatures .................................................................................................. ........ 1-7 1.4.1 physical layer interface c ontroller (pli c) ....................................................................... 1-7 1.4.2 pulse-width modulation (pwm) unit ............................................................................... 1-8 1.4.3 queued serial peripheral interface (qspi) ........................................................................ 1-8 1.4.4 universal serial bus (usb) module .................................................................................. 1-8 chapter 2 coldfire core 2.1 features and enha ncements .................................................................................................. ......... 2-1 2.1.1 decoupled pipe lines ...................................................................................................... ..... 2-1 2.1.1.1 instruction fetch pipe line (ifp) ............................................................................ 2-2 2.1.1.2 operand execution pipe line (oep) ...................................................................... 2-2 2.1.1.2.1 illegal opcode handling .............................................................................. 2-3 2.1.1.2.2 hardware multiply/accu mulate (mac) unit.............................................. 2-3 2.1.1.2.3 hardware divi de unit.................................................................................. 2-4 2.1.2 debug module enhan cements ............................................................................................ 2-4 2.2 programming model .......................................................................................................... ............ 2-4 2.2.1 user programmi ng model .................................................................................................. 2 -4 2.2.1.1 data registers (d0?d7) ....................................................................................... 2-5
MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 xiv freescale semiconductor table of contents (continued) paragraph page number title number 2.2.1.2 address registers (a0?a6) .................................................................................. 2-5 2.2.1.3 stack pointer (a7, sp) .......................................................................................... 2-5 2.2.1.4 program counter (pc) .......................................................................................... 2-6 2.2.1.5 condition code regist er (ccr) ........................................................................... 2-6 2.2.1.6 mac programming model ................................................................................... 2-7 2.2.2 supervisor program ming model ........................................................................................ 2-7 2.2.2.1 status register (sr) .............................................................................................. 2-8 2.2.2.2 vector base register (vbr) ................................................................................. 2-8 2.2.2.3 cache control regist er (cacr) .......................................................................... 2-9 2.2.2.4 access control register s (acr0?acr1) ............................................................ 2-9 2.2.2.5 rom base address regist er (rombar) ........................................................... 2-9 2.2.2.6 ram base address regist er (rambar) ........................................................... 2-9 2.2.2.7 module base address regi ster (mbar) ............................................................. 2-9 2.3 integer data formats ....................................................................................................... .............. 2-9 2.4 organization of data in registers .......................................................................................... ...... 2-10 2.4.1 organization of integer data formats in registers .......................................................... 2-10 2.4.2 organization of integer data formats in memory ........................................................... 2-11 2.5 addressing mode summary .................................................................................................... .... 2-12 2.6 instruction set summary .................................................................................................... ......... 2-13 2.6.1 instruction set summary .................................................................................................. 2-15 2.7 instruction timing ......................................................................................................... ............... 2-19 2.7.1 move instruction ex ecution times ................................................................................ 2-20 2.7.2 execution timings?one-opera nd instructions .............................................................. 2-22 2.7.3 execution timings?two-opera nd instructions .............................................................. 2-22 2.7.4 miscellaneous instruction execution times ..................................................................... 2-24 2.7.5 branch instruction ex ecution times ................................................................................ 2-25 2.8 exception processi ng overview .............................................................................................. .... 2-25 2.8.1 exception stack fram e definition ................................................................................... 2-27 2.8.2 processor exce ptions ..................................................................................................... ... 2-28 chapter 3 hardware multiply/accumulate (mac) unit 3.1 overview ................................................................................................................... ..................... 3-1 3.1.1 mac programming model ................................................................................................. 3-2 3.1.2 general oper ation ........................................................................................................ ...... 3-3 3.1.3 mac instruction set summary .......................................................................................... 3-4 3.1.4 data represen tation ...................................................................................................... ...... 3-4 3.2 mac instruction execution timings .......................................................................................... ... 3-4
MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor xv table of contents (continued) paragraph page number title number chapter 4 local memory 4.1 interactions between local memory modules .............................................................................. 4-1 4.2 local memory registers ..................................................................................................... ........... 4-2 4.3 sram overview .............................................................................................................. ............. 4-2 4.3.1 sram operation ........................................................................................................... ..... 4-2 4.3.2 sram programming model .............................................................................................. 4-2 4.3.2.1 sram base address regi ster (rambar) ......................................................... 4-3 4.3.2.2 sram initializat ion ............................................................................................. 4-4 4.3.2.3 programming rambar for power management ............................................... 4-4 4.4 rom overview ............................................................................................................... ............... 4-5 4.4.1 rom operat ion ............................................................................................................ ...... 4-5 4.4.2 rom programming model ................................................................................................. 4-5 4.4.2.1 rom base address regist er (rombar) ........................................................... 4-5 4.4.2.2 programming rombar for power management ............................................... 4-6 4.5 instruction cache overview ................................................................................................. ......... 4-7 4.5.1 instruction cache physic al organization ........................................................................... 4-7 4.5.2 instruction cache operation .............................................................................................. .4-8 4.5.2.1 interaction with ot her modules ............................................................................ 4-8 4.5.2.2 cache coherency and invalidation ....................................................................... 4-8 4.5.2.3 caching mode s ..................................................................................................... 4-9 4.5.2.3.1 cacheable accesses ..................................................................................... 4-9 4.5.2.3.2 cache-inhibited accesses ............................................................................ 4-9 4.5.2.4 reset .................................................................................................................. .4-10 4.5.2.5 cache miss fetch algorit hm/line fills ............................................................. 4-10 4.5.3 instruction cache progr amming model ........................................................................... 4-12 4.5.3.1 cache control regist er (cacr) ........................................................................ 4-12 4.5.3.2 access control registers (acr0 and acr1) .................................................... 4-14 chapter 5 debug support 5.1 overview ................................................................................................................... ..................... 5-1 5.2 signal description ......................................................................................................... ................. 5-2 5.3 real-time trace support .................................................................................................... ........... 5-3 5.3.1 begin execution of taken branch (pst = 0x5) ................................................................. 5-4 5.4 programming model .......................................................................................................... ............ 5-5 5.4.1 revision a shared de bug resources ................................................................................. 5-7 5.4.2 address attribute trigger register (aat r) ...................................................................... 5-7 5.4.3 address breakpoint register s (ablr, abhr) ................................................................. 5-9 5.4.4 configuration/status re gister (csr ) ............................................................................... 5-10
MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 xvi freescale semiconductor table of contents (continued) paragraph page number title number 5.4.5 data breakpoint/mask regist ers (dbr, dbmr ) ............................................................ 5-12 5.4.6 program counter brea kpoint/mask registers (pbr, pbmr) ................................................................................................................... ......... 5-13 5.4.7 trigger definition regi ster (tdr) ................................................................................... 5-14 5.5 background debug mode (bdm) ............................................................................................... 5 -15 5.5.1 cpu halt ................................................................................................................. ......... 5-16 5.5.2 bdm serial in terface ..................................................................................................... .. 5-17 5.5.2.1 receive packet format ....................................................................................... 5-18 5.5.2.2 transmit packet format ...................................................................................... 5-18 5.5.3 bdm command set ......................................................................................................... 5 -19 5.5.3.1 coldfire bdm command format ...................................................................... 5-20 5.5.3.1.1 extension words as required .................................................................... 5-20 5.5.3.2 command sequence di agrams ........................................................................... 5-21 5.5.3.3 command set descri ptions ................................................................................ 5-22 5.5.3.3.1 read a/d register ( rareg / rdreg )........................................................... 5-22 5.5.3.3.2 write a/d register ( wareg / wdreg ) ........................................................ 5-23 5.5.3.3.3 read memory location ( read ) ................................................................. 5-24 5.5.3.3.4 write memory location ( write )............................................................... 5-25 5.5.3.3.5 dump memory block ( dump ) ................................................................... 5-27 5.5.3.3.6 fill memory block ( fill ) .......................................................................... 5-28 5.5.3.3.7 resume execution ( go ) ............................................................................. 5-29 5.5.3.3.8 no operation ( nop ).................................................................................... 5-30 5.5.3.3.9 read control register ( rcreg ).................................................................. 5-30 5.5.3.3.10 write control register ( wcreg ).............................................................. 5-31 5.5.3.3.11 read debug module register ( rdmreg )................................................. 5-32 5.5.3.3.12 write debug module register ( wdmreg )............................................... 5-33 5.6 real-time debu g support .................................................................................................... ....... 5-33 5.6.1 theory of op eration ...................................................................................................... .... 5-34 5.6.1.1 emulator mode ................................................................................................... 5-35 5.6.2 concurrent bdm and pro cessor operation ...................................................................... 5-35 5.7 processor status, dda ta definition ......................................................................................... .. 5-36 5.7.1 user instruction set ..................................................................................................... ..... 5-36 5.7.2 supervisor instru ction set ............................................................................................... .5-40 5.8 freescale-recommended bdm pinout ....................................................................................... 5-41 chapter 6 system integration module (sim) 6.1 features ................................................................................................................... ....................... 6-1 6.2 programming model .......................................................................................................... ............ 6-2 6.2.1 sim register memo ry map ................................................................................................ 6- 2 6.2.2 module base address regi ster (mbar) ........................................................................... 6-3
MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor xvii table of contents (continued) paragraph page number title number 6.2.3 system configuration re gister (scr) ............................................................................... 6-5 6.2.4 system protection regi ster (spr) ...................................................................................... 6-6 6.2.5 power management regi ster (pmr) .................................................................................. 6-7 6.2.6 activate low-power regi ster (alpr) ............................................................................ 6-10 6.2.7 device identification re gister (dir) ............................................................................... 6-11 6.2.8 software watchdog timer ................................................................................................ 6- 11 6.2.8.1 watchdog reset reference re gister (wrrr) ................................................... 6-12 6.2.8.2 watchdog interrupt reference register (wirr) ................................................ 6-12 6.2.8.3 watchdog counter register (wcr) ................................................................... 6-13 6.2.8.4 watchdog event regist er (wer) ....................................................................... 6-13 chapter 7 interrupt controller 7.1 overview ................................................................................................................... ..................... 7-1 7.2 interrupt controller registers ............................................................................................. ........... 7-2 7.2.1 interrupt controller registers ........................................................................................... .. 7-3 7.2.2 interrupt control regist ers (icr1?icr4) .......................................................................... 7-4 7.2.2.1 interrupt control regist er 1 (icr1) ..................................................................... 7-4 7.2.2.2 interrupt control regist er 2 (icr2) ..................................................................... 7-5 7.2.2.3 interrupt control regist er 3 (icr3) ..................................................................... 7-5 7.2.2.4 interrupt control regist er 4 (icr4) ..................................................................... 7-5 7.2.3 interrupt source re gister (isr) .......................................................................................... 7-6 7.2.4 programmable interrupt transiti on register (pitr) .......................................................... 7-7 7.2.5 programmable interrupt wakeup register (piwr) ............................................................ 7-8 7.2.6 programmable interrupt vector register (pivr) ............................................................... 7-9 chapter 8 chip select module 8.1 overview ................................................................................................................... ..................... 8-1 8.1.1 features ................................................................................................................. .............. 8-1 8.1.2 chip select usage ........................................................................................................ ....... 8-1 8.1.3 boot cs0 oper ation ....................................................................................................... .... 8-2 8.2 chip select registers ...................................................................................................... ............... 8-2 8.2.1 chip select base regist ers (csbr0?csbr7) ................................................................... 8-3 8.2.2 chip select option regist ers (csor0?cso r7) ............................................................... 8-5
MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 xviii freescale semiconductor table of contents (continued) paragraph page number title number chapter 9 sdram controller 9.1 overview ................................................................................................................... ..................... 9-1 9.2 sdram controller signals ................................................................................................... ........ 9-1 9.3 interface to sdra m devices ................................................................................................. ....... 9-4 9.4 sdram banks, page hits, and page misses ................................................................................ 9-6 9.5 sdram registers ............................................................................................................ ............. 9-6 9.5.1 sdram configuration regi ster (sdcr) .......................................................................... 9-6 9.5.2 sdram timing register (sdtr) ..................................................................................... 9-8 9.6 auto initia lization ........................................................................................................ .................. 9-9 9.7 power-down and se lf-refresh ................................................................................................ ...... 9-9 9.8 performance ................................................................................................................ ................. 9-10 9.9 solving timing issues with sdcr[inv] .................................................................................... 9-1 2 9.10 sdram interface ........................................................................................................... ........... 9-14 9.10.1 sdram read accesses ................................................................................................. 9-15 9.10.2 sdram write acce sses .............................................. .................................................. 9-18 9.10.3 sdram refresh ti ming ................................................................................................ 9-20 chapter 10 dma controller 10.1 dma data transfer types ................................................................................................... ...... 10-1 10.2 dma address modes ......................................................................................................... ....... 10-2 10.3 dma controller registers .................................................................................................. ....... 10-2 10.3.1 dma mode register (dmr) ......................................................................................... 10-2 10.3.2 dma interrupt regist er (dir) ....................................................................................... 10-4 10.3.3 dma source address regi ster (dsar) ........................................................................ 10-5 10.3.4 dma destination address register (ddar) ................................................................ 10-6 10.3.5 dma byte count regist er (dbcr) ............................................................................... 10-6 chapter 11 ethernet module 11.1 overview .................................................................................................................. .................. 11-1 11.1.1 features ................................................................................................................ ........... 11-1 11.2 module operation .......................................................................................................... ............ 11-1 11.3 transceiver c onnection .................................................................................................... ......... 11-3 11.4 fec frame tran smission .................................................................................................... ....... 11-4 11.4.1 fec frame re ception .................................................................................................... 1 1-5 11.4.2 cam interface ........................................................................................................... ..... 11-6 11.4.3 ethernet address recognition ........................................................................................ 11-6 11.4.4 hash table al gorithm .................................................................................................... . 11-8
MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor xix table of contents (continued) paragraph page number title number 11.4.5 interpacket gap time .................................................................................................... . 11-8 11.4.6 collision ha ndling ...................................................................................................... .... 11-8 11.4.7 internal and external loopback ..................................................................................... 11-8 11.4.8 ethernet error-handl ing procedure ................................................................................ 11-9 11.4.8.1 transmission errors .......................................................................................... 11-9 11.4.8.2 reception errors ............................................................................................... 11-9 11.5 programming model ......................................................................................................... ....... 11-10 11.5.1 ethernet control regi ster (ecr) ...................................................................................11-11 11.5.2 interrupt event register (eir) ..................................................................................... 11-12 11.5.3 interrupt mask register (eimr) .................................................................................. 11-13 11.5.4 interrupt vector status register (ivsr) ....................................................................... 11-14 11.5.5 receive descriptor active register (rdar) ............................................................... 11-15 11.5.6 transmit descriptor active register (tdar) ............................................................. 11-16 11.5.7 mii management frame re gister (mmfr) ................................................................. 11-17 11.5.8 mii speed control regi ster (mscr) ........................................................................... 11-18 11.5.9 fifo receive bound regi ster (frbr) ........................................................................ 11-19 11.5.10 fifo receive start register (frsr) ......................................................................... 11-20 11.5.11 transmit fifo watermark (tfwr) ........................................................................... 11-21 11.5.12 fifo transmit start register (tfsr) ........................................................................ 11-22 11.5.13 receive control register (rcr) ................................................................................ 11-23 11.5.14 maximum frame length re gister (mflr) ............................................................... 11-24 11.5.15 transmit control register (tcr) ............................................................................... 11-25 11.5.16 ram perfect match addres s low (malr) .............................................................. 11-26 11.5.16.1 ram perfect match address high (maur) ............................................... 11-27 11.5.17 hash table high (htur) ........................................................................................... 11-28 11.5.18 hash table low (htlr) ............................................................................................ 11-29 11.5.19 pointer-to-receive descriptor ring (erdsr) ........................................................... 11-30 11.5.20 pointer-to-transmit descri ptor ring (etdsr) .......................................................... 11-31 11.5.21 receive buffer size register (emrbr) .................................................................... 11-32 11.5.22 initialization sequence ............................................................................................... 1 1-33 11.5.22.1 hardware initialization ................................................................................. 11-33 11.5.23 user initialization (prior to asserting ether_en) .................................................. 11-33 11.5.24 fec initiali zation ..................................................................................................... .. 11-34 11.5.24.1 user initializat ion (after setting ether_en) .............................................. 11-34 11.6 buffer descriptors ........................................................................................................ ............ 11-34 11.6.1 fec buffer descript or tables ...................................................................................... 11-35 11.6.1.1 ethernet receive buffer de scriptor (rxbd) .................................................. 11-35 11.6.1.2 ethernet transmit buff er descriptor .............................................................. 11-37 11.7 differences between MCF5272 fec and mpc860t fec ...................................................... 11-39
MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 xx freescale semiconductor table of contents (continued) paragraph page number title number chapter 12 universal serial bus (usb) 12.1 introduction .............................................................................................................. .................. 12-1 12.2 module operation .......................................................................................................... ............ 12-2 12.2.1 usb module archit ecture .............................................................................................. 12- 2 12.2.1.1 usb transceiver in terface ................................................................................ 12-3 12.2.1.2 clock generator ................................................................................................ 12-4 12.2.1.3 usb control l ogic ........................................................................................... 12-4 12.2.1.4 endpoint contro llers ......................................................................................... 12-5 12.2.1.5 usb request proc essor .................................................................................... 12-5 12.3 register description and programming model ......................................................................... 12-7 12.3.1 usb memory map ......................................................................................................... 1 2-7 12.3.2 register descri ptions ................................................................................................... ... 12-9 12.3.2.1 usb frame number register (fnr) ............................................................... 12-9 12.3.2.2 usb frame number match register (fnmr) ................................................. 12-9 12.3.2.3 usb real-time frame monito r register (rfmr) ........................................ 12-10 12.3.2.4 usb real-time frame monitor ma tch register (rfmmr) ......................... 12-11 12.3.2.5 usb function address re gister (far) .......................................................... 12-11 12.3.2.6 usb alternate settings register (asr ) ......................................................... 12-12 12.3.2.7 usb device request data 1 and 2 registers (drr1/ 2) ............................... 12-13 12.3.2.8 usb specification number register (specr) .............................................. 12-14 12.3.2.9 usb endpoint 0 status re gister (ep0sr) ...................................................... 12-14 12.3.2.10 usb endpoint 0 in configura tion register (iep0cfg) ............................. 12-15 12.3.2.11 usb endpoint 0 out configurat ion register (oep0cfg) ........................ 12-16 12.3.2.12 usb endpoint 1?7 configurati on register (epncfg) ................................ 12-16 12.3.2.13 usb endpoint 0 control re gister (ep0ctl) .............................................. 12-17 12.3.2.14 usb endpoint 1?7 control re gister (epnctl) .......................................... 12-20 12.3.2.15 usb endpoint 0 interrupt mask (ep0im r) and general/end point 0 interrupt registers (ep0is r) .......................................................................................................... 12 -22 12.3.2.16 usb endpoints 1?7 status / interr upt registers (epnisr) .......................... 12-25 12.3.2.17 usb endpoint 1?7 interrupt mask registers (epnimr) ............................. 12-26 12.3.2.18 usb endpoint 0?7 data re gisters (epndr) ................................................ 12-27 12.3.2.19 usb endpoint 0?7 data presen t registers (epndpr) ................................. 12-28 12.3.3 configuration ram ...................................................................................................... 1 2-28 12.3.3.1 configuration ram content .......................................................................... 12-28 12.3.3.2 usb device configurat ion example .............................................................. 12-29 12.3.4 usb module access times .......................................................................................... 12-30 12.3.4.1 registers ......................................................................................................... 12-3 0 12.3.4.2 endpoint fifo s .............................................................................................. 12-30 12.3.4.3 configuration ram ........................................................................................ 12-30
MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor xxi table of contents (continued) paragraph page number title number 12.4 software architecture and application no tes ......................................................................... 12-31 12.4.1 usb module initiali zation ........................................................................................... 12-3 1 12.4.2 usb configuration and interface changes .................................................................. 12-31 12.4.3 fifo configur ation ...................................................................................................... 12-32 12.4.4 data flow ............................................................................................................... ...... 12-32 12.4.4.1 control, bulk, and inte rrupt endpoints .......................................................... 12-33 12.4.4.1.1 in endpoint s .......................................................................................... 12-33 12.4.4.1.2 out endpoint s ...................................................................................... 12-33 12.4.4.2 isochronous endp oints .................................................................................... 12-33 12.4.4.2.1 in endpoint s .......................................................................................... 12-34 12.4.4.2.2 out endpoint s ...................................................................................... 12-34 12.4.5 class- and vendor-specific request operat ion ............................................................ 12-34 12.4.6 remote wakeup and resume operation ......................................................................... 12-35 12.4.7 endpoint halt feature ................................................................................................... 12-35 12.5 line interface ............................................................................................................ ............... 12-36 12.5.1 attachment dete ction ................................................................................................... 1 2-36 12.5.2 pcb layout recommendations ................................................................................... 12-36 12.5.3 recommended usb protec tion circuit ........................................................................ 12-37 chapter 13 physical layer interface controller (plic) 13.1 introduction .............................................................................................................. .................. 13-1 13.2 gci/idl block ............................................................................................................. ............. 13-3 13.2.1 gci/idl b- and d-channel rece ive data registers ..................................................... 13-3 13.2.2 gci/idl b- and d-channel tran smit data registers ................................................... 13-4 13.2.3 gci/idl b- and d-channe l bit alignment ................................................................... 13-5 13.2.3.1 b-channel unencode d data ............................................................................. 13-5 13.2.3.2 b-channel hdlc enc oded data ...................................................................... 13-6 13.2.3.3 d-channel hdlc enc oded data ..................................................................... 13-6 13.2.3.4 d-channel unencode d data ............................................................................. 13-7 13.2.3.5 gci/idl d-channel contention ..................................................................... 13-8 13.2.4 gci/idl looping m odes ............................................................................................... 13-8 13.2.4.1 automatic echo mode ...................................................................................... 13-9 13.2.4.2 local loopback mode ...................................................................................... 13-9 13.2.4.3 remote loopback mode ................................................................................... 13-9 13.2.5 gci/idl inte rrupts ...................................................................................................... ... 13-9 13.2.5.1 gci/idl periodic fram e interrupt ................................................................... 13-9 13.2.5.2 gci aperiodic status interrupt ...................................................................... 13-10 13.2.5.3 interrupt control ............................................................................................. 13-11 13.3 plic timing ge nerator ..................................................................................................... ...... 13-11
MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 xxii freescale semiconductor table of contents (continued) paragraph page number title number 13.3.1 clock synthe sis ......................................................................................................... ... 13-11 13.3.2 super frame sync generation ...................................................................................... 13-13 13.3.3 frame sync synt hesis ................................................................................................... 1 3-13 13.4 plic register me mory map .................................................................................................. . 13-13 13.5 plic registers ............................................................................................................ ............. 13-15 13.5.1 b1 data receive registers (p0b1rr?p3b1rr) ......................................................... 13-15 13.5.2 b2 data receive registers (p0b2rr?p3b2rr) ......................................................... 13-16 13.5.3 d data receive registers (p0drr?p3drr) .............................................................. 13-16 13.5.4 b1 data transmit register s (p0b1tr?p3b1tr) ......................................................... 13-17 13.5.5 b2 data transmit register s (p0b2tr?p3b2tr) ........................................................ 13-17 13.5.6 d data transmit register s (p0dtr?p3dtr) ............................................................. 13-18 13.5.7 port configuration regist ers (p0cr?p3cr) ............................................................... 13-18 13.5.8 loopback control regi ster (plcr) ............................................................................. 13-20 13.5.9 interrupt configuration regi sters (p0icr?p3icr) ..................................................... 13-20 13.5.10 periodic status register s (p0psr?p3psr) ................................................................ 13-22 13.5.11 aperiodic status regi ster (pasr) .............................................................................. 13-23 13.5.12 gci monitor channel receive registers (p0gmr?p3gmr) ................................... 13-24 13.5.13 gci monitor channel transmit registers (p0gmt?p3gmt) .................................. 13-25 13.5.14 gci monitor channel transmit abort register (pgmta) ....................................... 13-26 13.5.15 gci monitor channel transmit st atus register (pgmts) ....................................... 13-27 13.5.16 gci c/i channel receive regi sters (p0gcir?p3gcir) .......................................... 13-28 13.5.17 gci c/i channel transmit regi sters (p0gcit?p3g cit) ......................................... 13-29 13.5.18 gci c/i channel transmit stat us register (pgcitsr) ............................................ 13-30 13.5.19 d-channel status regi ster (pdcsr) ......................................................................... 13-31 13.5.20 d-channel request regi ster (pdrqr) ..................................................................... 13-32 13.5.21 sync delay registers (p0sdr?p3sdr) .................................................................... 13-33 13.5.22 clock select regist er (pcsr) .................................................................................... 13-34 13.6 application ex amples ...................................................................................................... ........ 13-35 13.6.1 introduction ............................................................................................................ ...... 13-35 13.6.2 plic initiali zation ..................................................................................................... ... 13-35 13.6.2.1 port configurati on example ........................................................................... 13-35 13.6.2.2 interrupt configura tion example .................................................................... 13-37 13.6.3 example 1: isdn soho pbx wi th ports 0, 1, 2, and 3 .............................................. 13-38 13.6.4 example 2: isdn soho pbx wi th ports 1, 2, and 3 .................................................. 13-40 13.6.5 example 3: two-line remote a ccess with ports 0 and 1 ........................................... 13-41
MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor xxiii table of contents (continued) paragraph page number title number chapter 14 queued serial peripheral interface (qspi) module 14.1 overview .................................................................................................................. .................. 14-1 14.2 features .................................................................................................................. .................... 14-1 14.3 module descri ption ........................................................................................................ ........... 14-1 14.3.1 interface and pins ...................................................................................................... ..... 14-3 14.3.2 internal bus in terface .................................................................................................. ... 14-3 14.4 operati on ................................................................................................................. .................. 14-3 14.4.1 qspi ram ................................................................................................................ ..... 14-4 14.4.1.1 receive ram ................................................................................................... 14-5 14.4.1.2 transmit ra m .................................................................................................. 14-6 14.4.1.3 command ram ............................................................................................... 14-6 14.4.2 baud rate se lection ..................................................................................................... .. 14-6 14.4.3 transfer delays ......................................................................................................... ...... 14-7 14.4.4 transfer le ngth ......................................................................................................... ..... 14-8 14.4.5 data transfer ........................................................................................................... ....... 14-8 14.5 programming m odel ......................................................................................................... ......... 14-9 14.5.1 qspi mode register (qmr) . ......................................................................................... 14-9 14.5.2 qspi delay register (qdlyr) ................................................................................... 14-11 14.5.3 qspi wrap register (qwr) ........................................................................................ 14-12 14.5.4 qspi interrupt regi ster (qir) ...................................................................................... 14-13 14.5.5 qspi address regist er (qar) ..................................................................................... 14-14 14.5.6 qspi data register (qdr) .......................................................................................... 14-14 14.5.7 command ram registers (qcr0?qcr15) ............................................................... 14-15 14.5.8 programming exam ple ................................................................................................. 14-1 6 chapter 15 timer module 15.1 overview .................................................................................................................. .................. 15-1 15.2 timer oper ation ........................................................................................................... .............. 15-1 15.3 general-purpose time r register s ........................................................................................... ... 15-3 15.3.1 timer mode registers (tmr0?tmr3) .......................................................................... 15-3 15.3.2 timer reference register s (trr0?trr3) .................................................................... 15-4 15.3.3 timer capture registers (tcap0?tcap3) ................................................................... 15-4 15.3.4 timer counters (tcn 0?tcn3) ..................................................................................... 15-4 15.3.5 timer event registers (ter0?ter3) ........................................................................... 15-5
MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 xxiv freescale semiconductor table of contents (continued) paragraph page number title number chapter 16 uart modules 16.1 overview .................................................................................................................. .................. 16-1 16.2 serial module overview .................................................................................................... ........ 16-2 16.3 register desc riptions ..................................................................................................... ............ 16-2 16.3.1 uart mode register s 1 (umr1n) ............................................................................... 16-4 16.3.2 uart mode register 2 (umr2n) ................................................................................. 16-6 16.3.3 uart status registers (usrn) ..................................................................................... 16-7 16.3.4 uart clock-select regi sters (ucsrn) ........................................................................ 16-8 16.3.5 uart command regist ers (ucrn) .............................................................................. 16-9 16.3.6 uart receiver buffers (urbn) ................................................................................. 16-10 16.3.7 uart transmitter buff ers (utbn) ............................................................................. 16-11 16.3.8 uart input port change re gisters (uipcrn) ............................................................ 16-11 16.3.9 uart auxiliary control re gisters (uacrn ) ............................................................. 16-12 16.3.10 uart interrupt status/mask re gisters (uisrn/uimrn) .......................................... 16-12 16.3.11 uart divider upper/lower re gisters (udun/udln) ............................................ 16-14 16.3.12 uart autobaud registers (uabun/uabln) .......................................................... 16-14 16.3.13 uart transmitter fifo re gisters (utfn) ............................................................... 16-15 16.3.14 uart receiver fifo re gisters (urfn) ................................................................... 16-16 16.3.15 uart fractional precision divider control registers (ufpdn) .............................. 16-17 16.3.16 uart input port regi sters (uipn) ............................................................................ 16-17 16.3.17 uart output port command registers (uop1n/uop0n) ....................................... 16-18 16.4 uart module signal de finitions ........................................................................................... 1 6-18 16.5 operati on ................................................................................................................. ................ 16-19 16.5.1 transmitter/receiver clock source .............................................................................. 16-19 16.5.1.1 programmable di vider .................................................................................... 16-20 16.5.1.2 calculating baud rates ................................................................................... 16-20 16.5.1.2.1 clkin baud ra tes ................................................................................ 16-20 16.5.1.2.2 external cl ock........................................................................................ 16-21 16.5.1.2.3 autobaud det ection ............................................................................... 16-21 16.5.2 transmitter and receiver operating mode s ................................................................. 16-22 16.5.2.1 transmitting ................................................................................................... 16-22 16.5.2.2 receiver ................... ....................................................................................... 16-2 4 16.5.2.3 transmitter fi fo ............................................................................................ 16-25 16.5.2.4 receiver fifo ............................................................................................... 16-25 16.5.3 looping modes ........................................................................................................... .. 16-26 16.5.3.1 automatic echo mode .................................................................................... 16-27 16.5.3.2 local loop-back mode .................................................................................. 16-27 16.5.3.3 remote loop-back mode ............................................................................... 16-27 16.5.4 multidrop m ode .......................................................................................................... .. 16-28
MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor xxv table of contents (continued) paragraph page number title number 16.5.5 bus operation ........................................................................................................... .... 16-29 16.5.5.1 read cycles .................................................................................................... 16-29 16.5.5.2 write cycles ................................................................................................... 16-29 16.5.5.3 interrupt acknowledge cycles ....................................................................... 16-29 16.5.6 programming ............................................................................................................. ... 16-30 16.5.6.1 uart module initializat ion sequence .......................................................... 16-30 chapter 17 general purpose i/o module 17.1 overview .................................................................................................................. .................. 17-1 17.2 port control registers .................................................................................................... ............ 17-2 17.2.1 port a control regist er (pacnt) .................................................................................. 17-3 17.2.2 port b control regist er (pbcnt) .................................................................................. 17-5 17.2.3 port c control register ................................................................................................. . 17-8 17.2.4 port d control regist er (pdcnt) ................................................................................. 17-8 17.3 data direction registers .................................................................................................. ........ 17-10 17.3.1 port a data direction re gister (paddr) .................................................................... 17-10 17.3.2 port b data direction re gister (pbddr) .................................................................... 17-10 17.3.3 port c data direction re gister (pcddr) .................................................................... 17-11 17.4 port data registers ....................................................................................................... ........... 17-11 17.4.1 port data register (pxdat) ......................................................................................... 17-11 chapter 18 pulse-width modula tion (pwm) module 18.1 overview .................................................................................................................. .................. 18-1 18.2 pwm opera tion ............................................................................................................. ............ 18-2 18.3 pwm programming model ..................................................................................................... .. 18-2 18.3.1 pwm control register (pwcrn) .................................................................................. 18-3 18.3.2 pwm width register (pwwdn) ................................................................................... 18-4 chapter 19 signal descriptions 19.1 MCF5272 block diagram with signal interfaces ..................................................................... 19-1 19.2 signal list ............................................................................................................... ................... 19-3 19.3 address bus (a[22:0] /sda[13:0]) .......................................................................................... 1 9-19 19.4 data bus (d[31:0]) ........................................................................................................ .......... 19-19 19.4.1 dynamic data bus sizing ............................................................................................ 19-19 19.5 chip selects (cs7/sdcs, cs[6:0]) ......................................................................................... 1 9-19 19.6 bus control signals ....................................................................................................... .......... 19-20 19.6.1 output enable/rea d (oe/rd) ...................................................................................... 19-20
MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 xxvi freescale semiconductor table of contents (continued) paragraph page number title number 19.6.2 byte strobes (b s[3:0]) ................................................................................................. 1 9-20 19.6.3 read/write (r/w) ........................................................................................................ . 19-21 19.6.4 transfer acknowledge (ta/pb5) ................................................................................. 19-22 19.6.5 hi-z .................................................................................................................... .......... 19-22 19.6.6 bypass .................................................................................................................. ......... 19-22 19.6.7 sdram row address stro be (ras0) ........................................................................ 19-22 19.6.8 sdram column address st robe (cas0) ................................................................... 19-22 19.6.9 sdram clock (sdc lk) ............................................................................................. 19-22 19.6.10 sdram write enable (sdwe) ................................................................................. 19-22 19.6.11 sdram clock enable (sdclke) ............................................................................ 19-22 19.6.12 sdram bank selects (s dba[1:0]) .......................................................................... 19-23 19.6.13 sdram row address 10 (a10)/a10 precharge (a10_prechg) .......................... 19-23 19.7 cpu clock and rese t signals ............................................................................................... ... 19-23 19.7.1 rsti ............................................................................................................................. 19 -23 19.7.2 dreseten .................................................................................................................. 19-23 19.7.3 cpu external cloc k (clkin) ..................................................................................... 19-23 19.7.4 reset output (r sto) ................................................................................................... 19 -23 19.8 interrupt request input s (int[6:1]) ....................................................................................... .. 19-23 19.9 general-purpose i/o (gpio) ports .......................................................................................... 19-24 19.10 uart0 module signals and pb[4:0] .................................................................................... 19-24 19.10.1 transmit serial data outp ut (urt0_txd/pb0) ........................................................ 19-24 19.10.2 receive serial data input (urt0_rxd/pb1) ............................................................ 19-25 19.10.3 clear-to-send (urt0_cts/pb2) ............................................................................... 19-25 19.10.4 request to send (urt0_rts /pb3) ............................................................................ 19-25 19.10.5 clock (urt0_clk/p b4) ........................................................................................... 19-25 19.11 usb module signals and pa[6:0] ......................................................................................... 19 -25 19.11.1 usb transmit serial data ou tput (usb_tp/pa 0) .................................................... 19-25 19.11.2 usb receive serial data input (usb_rp/pa 1) ........................................................ 19-25 19.11.3 usb receive data negati ve (usb_rn/pa2) ............................................................ 19-25 19.11.4 usb transmit data negati ve (usb_tn/pa3) ........................................................... 19-26 19.11.5 usb suspend driver (u sb_susp/pa4) .................................................................... 19-26 19.11.6 usb transmitter output enab le (usb_txen/pa5) .................................................. 19-26 19.11.7 usb rx data output (usb_rxd/pa6) ..................................................................... 19-26 19.11.8 usb_d+ and us b_d- ................................................................................................ 19-26 19.11.9 usb_clk ................................................................................................................ .. 19-26 19.11.10 int1/usb wake-on-ri ng (usb_wor) ................................................................. 19-26 19.12 timer module si gnals ..................................................................................................... ....... 19-27 19.12.1 timer input 0 (t in0) .................................................................................................. 1 9-27 19.12.2 timer output (tou t0)/pb7 ...................................................................................... 19-27 19.12.3 timer input 1 (tin1)/pwm mode output 2 (pwm_out2) .................................... 19-27 19.12.4 timer output 1 (tout1)/pwm mode output 1 (pwm_out1) .............................. 19-27
MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor xxvii table of contents (continued) paragraph page number title number 19.13 ethernet module signals .................................................................................................. ...... 19-27 19.13.1 transmit clock (e_txclk) ....................................................................................... 19-27 19.13.2 transmit data (e _txd0) ..... ....................................................................................... 19-28 19.13.3 collision (e_col) ..................................................................................................... 1 9-28 19.13.4 receive data valid (e_rxdv) ................................................................................... 19-28 19.13.5 receive clock (e_r xclk) ........................................................................................ 19-28 19.13.6 receive data (e_r xd0) ............................................. ................................................ 19-28 19.13.7 transmit enable (e _txen) . ....................................................................................... 19-28 19.13.8 transmit data (e_txd[3 :1]/pb[10:8]) ...................................................................... 19-28 19.13.9 receive data (e_rxd[3:1 ]/pb[13:11]) ...................................................................... 19-28 19.13.10 receive error (e_r xer/pb14) ................................................................................ 19-29 19.13.11 management data clock (e_mdc/pb15) ............................................................... 19-29 19.13.12 management data (e_mdio) .................................................................................. 19-29 19.13.13 transmit error (e _txer) ......................................................................................... 19-29 19.13.14 carrier receive se nse (e_crs) ............................................................................... 19-29 19.14 pwm module signals (pwm_ out0?pwm_out2]) ......................................................... 19-29 19.15 queued serial peripheral inte rface (qspi) signa ls ............................................................... 19-29 19.15.1 qspi synchronous serial data ou tput (qspi_dout/wsel) .................................... 19-30 19.15.2 qspi synchronous serial data input (qspi_din) ..................................................... 19-30 19.15.3 qspi serial clock (qsp i_clk/busw1) .................................................................. 19-30 19.15.4 synchronous peripheral chip sel ect 0 (qspi_cs0/busw0) ................................... 19-30 19.15.5 synchronous peripheral chip sel ect 1 (qspi_cs1/pa11) ........................................ 19-30 19.15.6 synchronous peripheral chip select 2 (qspi_cs2/urt1_cts ) .............................. 19-30 19.15.7 synchronous peripheral chip select 3 (pa7/dout3/qspi_cs3) ............................ 19-30 19.16 physical layer interface controller tdm ports and uart 1 .............................................. 19-31 19.16.1 gci/idl tdm port 0. ................................................ ................................................ 19-3 1 19.16.1.1 frame sync (fsr0/ fsc0/pa8) .................................................................... 19-31 19.16.1.2 d-channel grant (d gnt0/pa9) .................................................................. 19-31 19.16.1.3 data clock (dcl0/ urt1_clk) .................................................................. 19-31 19.16.1.4 serial data input (d in0/urt1_rxd) .......................................................... 19-31 19.16.1.5 uart1 cts (urt1_cts /qspi_cs2) ........................................................ 19-32 19.16.1.6 uart1 rts (urt1_rts /int5) ................................................................. 19-32 19.16.1.7 serial data output (d out0/urt1_txd) ................................................... 19-32 19.16.1.8 d-channel request(dr eq0/pa10) ............................................................. 19-32 19.16.1.9 qspi chip select 1 (q spi_cs1/pa11) ........................................................ 19-32 19.16.2 gci/idl tdm port 1 ................................................................................................. 19-3 2 19.16.2.1 gci/idl data clock (dcl1/gdcl1_out) ............................................... 19-32 19.16.2.2 gci/idl data ou t (dout1) ....................................................................... 19-33 19.16.2.3 gci/idl data in (din1) .............................................................................. 19-33 19.16.2.4 gci/idl frame sync ( fsc1/fsr1/dfsc1) ............................................... 19-33 19.16.2.5 d-channel request (d req1/pa14) ............................................................ 19-33
MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 xxviii freescale semiconductor table of contents (continued) paragraph page number title number 19.16.2.6 d-channel grant (dgnt1_i nt6/pa15_int6) ........................................... 19-33 19.16.3 gci/idl tdm ports 2 and 3 ...................................................................................... 19-34 19.16.3.1 gci/idl delayed frame s ync 2 (dfsc2/pa12) ......................................... 19-34 19.16.3.2 gci/idl delayed frame s ync 3 (dfsc3/pa13) ......................................... 19-34 19.16.3.3 qspi_cs3, port 3 gci/idl data ou t 3, pa7 (pa7/dout3/qspi_cs3) ... 19-34 19.16.3.4 int4 and port 3 gci/idl data in (int4/din3) ......................................... 19-35 19.17 jtag test access port a nd bdm debug po rt ...................................................................... 19-35 19.17.1 test clock (tck/ pstclk) ........................................................................................ 19-35 19.17.2 test mode select and force breakpoint (tms/b kpt) .............................................. 19-35 19.17.3 test and debug data ou t (tdo/dso) ...................................................................... 19-36 19.17.4 test and debug data in (tdi/dsi) ............................................................................ 19-36 19.17.5 jtag trst and bdm data clock (trst/dsclk) ................................................ 19-36 19.17.6 freescale test mode se lect (mtmod ) ..................................................................... 19-36 19.17.7 debug transfer error ac knowledge (tea) ............................................................... 19-36 19.17.8 processor status output s (pst[3:0]) .......................................................................... 19-36 19.17.9 debug data (ddata[3 :0]) ........................................................................................ 19-37 19.17.10 device test enable (test) ...................................................................................... 19-37 19.18 operating mode config uration pins ...................................................................................... 19 -37 19.19 power supply pins ........................................................................................................ ......... 19-38 chapter 20 bus operation 20.1 features .................................................................................................................. .................... 20-1 20.2 bus and control signals ................................................................................................... ......... 20-1 20.2.1 address bus (a [22:0]) ................................................................................................... 20-2 20.2.2 data bus (d[ 31:0]) ...................................................................................................... ... 20-2 20.2.3 read/write (r/w) ........................................................................................................ ... 20-2 20.2.4 transfer acknowledge (ta) ........................................................................................... 20-2 20.2.5 transfer error acknow ledge (tea) ............................................................................... 20-3 20.3 bus exception: doubl e bus fault ........................................................................................... ... 20-3 20.4 bus characteristics ....................................................................................................... ............. 20-3 20.5 data transfer mechanism ................................................................................................... ....... 20-4 20.5.1 bus sizing .............................................................................................................. ......... 20-4 20.6 external bus interface types .............................................................................................. ....... 20-7 20.6.1 interface for flash/sram devices with byte strobes ............................................... 20-8 20.6.2 interface for flash/sram devices without byte strobes ........................................ 20-12 20.7 burst data transfers ...................................................................................................... .......... 20-17 20.8 misaligned operands ....................................................................................................... ........ 20-18 20.9 interrupt cycles .......................................................................................................... .............. 20-19 20.10 bus errors ............................................................................................................... ............... 20-19 20.11 bus arbitr ation .......................................................................................................... ............. 20-21
MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor xxix table of contents (continued) paragraph page number title number 20.12 reset operation .......................................................................................................... ............ 20-21 20.12.1 master reset ........................................................................................................... .... 20-22 20.12.2 normal reset ........................................................................................................... ... 20-23 20.12.3 software watchdog timer re set operation ............................................................... 20-24 20.12.4 soft reset op eration ................................................................................................... 20-25 chapter 21 ieee 1149.1 test access port (jtag) 21.1 overview .................................................................................................................. .................. 21-1 21.2 jtag test access port a nd bdm debug port .......................................................................... 21-2 21.3 tap controller ............................................................................................................ ............... 21-3 21.4 boundary scan re gister .................................................................................................... ......... 21-4 21.5 instruction register ...................................................................................................... .............. 21-7 21.6 restrictions .............................................................................................................. .................. 21-8 21.7 non-ieee 1149.1 op eration ................................................................................................. ..... 21-8 chapter 22 mechanical data 22.1 pinout .................................................................................................................... ..................... 22-1 22.2 package dime nsions ........................................................................................................ .......... 22-2 chapter 23 electrical characteristics 23.1 maximum ratings ........................................................................................................... ........... 23-1 23.1.1 supply, input voltage, and st orage temperat ure ........................................................... 23-1 23.1.2 operating temp erature ................................................................................................... 23-2 23.1.3 resistance .............................................................................................................. ......... 23-2 23.2 dc electrical sp ecifications .............................................................................................. ........ 23-3 23.2.1 output driver capabili ty and loading ........................................................................... 23-3 23.3 ac electrical sp ecifications .............................................................................................. ........ 23-5 23.3.1 clock input and output timi ng specificatio ns .............................................................. 23-5 23.3.2 processor bus input timi ng specifications .................................................................... 23-6 23.3.3 processor bus output timi ng specifications ................................................................. 23-8 23.4 debug ac timing spec ifications ............................................................................................ 23-13 23.5 sdram interface timing specifications ................................................................................ 23-14 23.6 fast ethernet ac timi ng specifications ................................................................................. 23- 17 23.6.1 mii receive signal timing (e_rxd[3:0], e_rxdv, e_rxer, and e_rxclk) ........ 23-17 23.6.2 mii transmit signal timing (e_txd[3:0 ], e_txen, e_txer, e_txclk) .............. 23-18 23.6.3 mii async inputs signal timi ng (crs and co l) ....................................................... 23-19 23.6.4 mii serial management channe l timing (mdio a nd mdc) ..................................... 23-20
MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 xxx freescale semiconductor table of contents (continued) paragraph page number title number 23.7 timer module ac timing specifications ................................................................................ 23-21 23.8 uart modules ac timing sp ecifications ............................................................................. 23-22 23.9 plic module: idl and gci interf ace timing specifi cations ................................................ 23-23 23.10 general-purpose i/o port ac timing specificat ions ............................................................ 23-28 23.11 usb interface ac timi ng specifications .............................................................................. 23-29 23.12 ieee 1149.1 (jtag) ac timing specifications ................................................................... 23-30 23.13 qspi electrical spec ifications ........................................................................................... .... 23-31 23.14 pwm electrical sp ecifications ............................................................................................ .. 23-32 appendix a list of memory maps a.1 list of memory map tables.................................................................................................. .......... a-1 appendix b buffering and impedance matching index 1
MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor xxxi list of tables table page number title number 2-1 ccr field descriptions ...................................... .......................................... ...................... .... 2-6 2-2 movec register map.......................................................................................................... ... 2-7 2-3 status field descriptions ................................................................................................... ..... 2-8 2-4 integer data formats ........................................................................................................ ...... 2-9 2-5 coldfire effective addressing modes .................................................................................. 2-12 2-6 notational conventions ..................................................................................................... ... 2-13 2-7 user-mode instruction set summary .................................................................................... 2-15 2-8 supervisor-mode instruction set summary ......................................................................... 2-18 2-9 misaligned operand references.......................................................................................... 2-19 2-10 move byte and word execution times ................................................................................. 2-20 2-11 move long execution times................................................................................................ 2 -21 2-12 move execution times...................................................................................................... ... 2-21 2-13 one-operand instruction exec ution times ........................................................................... 2-22 2-14 two-operand instruction exec ution times ........................................................................... 2-22 2-15 miscellaneous instruction execution times .......................................................................... 2-24 2-16 general branch instruction execution times........................................................................ 2-25 2-17 bcc instruction execution times .......................................................................................... 2 -25 2-18 exception vector assignments ............................................................................................. 2- 26 2-19 format field encoding ...................................................................................................... .... 2-27 2-20 fault status encodings ..................................................................................................... .... 2-28 2-21 mcf5 272 exceptions .......................................................................................................... 2-28 3-1 mac instruction summary ..................................................................................................... .3-4 4-1 memory map of instruction cache registers .......................................................................... 4-2 4-2 rambar field description .................................................................................................... .4-3 4-3 examples of typical rambar settings.................................................................................. 4-4 4-4 rombar field description.................................................................................................... .4-6 4-5 examples of typical rombar settings ................................................................................. 4-6 4-6 instruction cache operation as defi ned by cacr[cenb,ceib].......................................... 4-11 4-7 memory map of instruction cache registers ........................................................................ 4-12 4-8 cacr field descriptions ..................................................................................................... .4-13 4-9 acrn field descriptions ..................................................................................................... .. 4-14 5-1 debug module signals ........................................................................................................ .... 5-2 5-2 processor status encoding................................................................................................... .. 5-3 5-3 bdm/breakpoint registers.................................................................................................... .. 5-6 5-4 rev. a shared bdm/breakpoint hardware ............................................................................. 5-7 5-5 aatr field descriptions ..................................................................................................... .... 5-7 5-6 ablr field description ...................................................................................................... ..... 5-9 5-7 abhr field description ...................................................................................................... .... 5-9 5-8 csr field descriptions ...................................................................................................... ... 5-10 5-9 dbr field descriptions ...................................................................................................... ... 5-12
MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 xxxii freescale semiconductor list of tables (continued) table page number title number 5-10 dbmr field descriptions .................................................................................................... .. 5-12 5-11 access size and operand data location ............................................................................. 5-12 5-12 pbr field descriptions ..................................................................................................... .... 5-13 5-13 pbmr field descriptions .................................................................................................... .. 5-13 5-14 tdr field descriptions ..................................................................................................... .... 5-14 5-15 receive bdm packet field description ................................................................................ 5-18 5-16 transmit bdm packet field description ............................................................................... 5-18 5-17 bdm command summary .................................................................................................... 5-19 5-18 bdm field descriptions..................................................................................................... .... 5-20 5-19 control register map ....................................................................................................... ..... 5-30 5-20 definition of drc encoding?read ....................................................................................... 5-32 5-21 ddata[3:0]/csr[bstat] breakpoint response ................................................................. 5-34 5-22 pst/ddata specification for user-mode instructions ......................................................... 5-37 5-23 pst/ddata specification for supervisor-mode instructions................................................ 5-40 6-1 sim registers ............................................................................................................... .......... 6-3 6-2 mbar field descriptions .................................................................................................... ... 6-4 6-3 scr field descriptions ...................................................................................................... ..... 6-5 6-4 spr field descriptions ...................................................................................................... ..... 6-6 6-5 pmr field descriptions...................................................................................................... ..... 6-8 6-6 usb and usart power down modes ................................................................................... 6-9 6-7 exiting sleep and stop modes .............................................................................................. 6- 10 6-8 dir field descriptions ...................................................................................................... .... 6-11 6-9 wrrr field descriptions ................................... .......................................... ........................ 6-12 6-10 wirr field descriptions .................................................................................................... ... 6-13 6-11 wer field descriptions ..................................................................................................... ... 6-13 7-1 interrupt controller registers .............................................................................................. .... 7-2 7-2 interrupt and power management register mnemonics......................................................... 7-3 7-3 icr field descriptions ...................................................................................................... ...... 7-4 7-4 isr field descriptions...................................................................................................... ....... 7-6 7-5 pitr field descriptions ..................................................................................................... ..... 7-7 7-6 piwr field descriptions ..................................................................................................... .... 7-8 7-7 pivr field descriptions ..................................................................................................... ..... 7-9 7-8 MCF5272 interrupt vector table........................................................................................... 7-1 0 8-1 cscr and csor values after reset ..................................................................................... 8-2 8-2 csbrn field descriptions.................................................................................................... ... 8-3 8-3 output read/write strobe levels versus chip select ebi code ............................................ 8-4 8-4 chip select memory address dec oding priority ..................................................................... 8-5 8-5 csorn field descriptions .................................................................................................... .. 8-5 9-1 sdram controller signal descriptions................................................................................... 9-2 9-2 connecting bs[3:0] to dqmx .................................................................................................. 9-4 9-3 configurations for 16-bit data bus.......................................................................................... 9-4 9-4 configurations for 32-bit data bus.......................................................................................... 9-4 9-5 internal address mult iplexing (16-bit data bus) ..................................................................... 9-5 9-6 internal address mult iplexing (32-bit data bus) ..................................................................... 9-5
MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor xxxiii list of tables (continued) table page number title number 9-7 sdcr field descriptions ..................................................................................................... ... 9-7 9-8 sdtr field descriptions..................................................................................................... .... 9-8 9-9 sdram controller performance, 32-bit port, (rcd = 0, rp = 1) or (rcd = 1, rp = 0) ...... 9-10 9-10 sdram controller performance, 32?bit port, (rcd = 0, rp = 0)........................................ 9-10 9-11 sdram controller performance (rcd = 1, rp = 1), 16-bit port.......................................... 9-11 9-12 sdram controller performance, 16-bit port, (rcd=0, rp=1) or (rcd=1, rp = 0)9-11 9-13 sdram controller performance, 16-bi t port, (rcd=0, rp=0)............................................. 9-12 10-1 dma data transfer matrix ................................................................................................... .10-1 10-2 dmr field descriptions ..................................................................................................... ... 10-2 10-3 dir field descriptions ..................................................................................................... ..... 10-4 11-1 mii mode ................................................................................................................... ............ 11-3 11-2 seven-wire mode configuration ........................................................................................... 11- 4 11-3 ethernet address recogn ition .............................................................................................. 1 1-7 11-4 transmission errors ........................................................................................................ ...... 11-9 11-5 reception errors ........................................................................................................... ........ 11-9 11-6 fec register memory map................................................................................................. 11- 10 11-7 ecr field descriptions ..................................................................................................... .. 11-11 11-8 eir field descriptions..................................................................................................... .... 11-12 11-9 eimr register field descriptions ....................................................................................... 11-1 3 11-10 ivsr field descriptions ................................................................................................... ... 11-14 11-11 rdar register field descriptions ...................................................................................... 11-1 5 11-12 tdar field descriptions................................................................................................... .. 11-16 11-13 mmfr field descriptions................................................................................................... . 11-17 11-14 mscr field descriptions ................................................................................................... . 11-18 11-15 programming examples for mscr register....................................................................... 11-19 11-16 frbr field descriptions................................................................................................... .. 11-19 11-17 frsr field descriptions................................................................................................... .. 11-20 11-18 tfwr field descriptions ................................................................................................... . 11-21 11-19 tfsr field descriptions ................................................................................................... .. 11-22 11-20 rcr field descripti ons............................ ........................................... ............................. ... 11-23 11-21 mflr field descriptions................................................................................................... .. 11-24 11-22 tcr field descriptions .................................................................................................... ... 11-25 11-23 malr field descriptions................................................................................................... .. 11-26 11-24 maur field descriptions ................................................................................................... . 11-27 11-25 htur field descriptions................................................................................................... .. 11-28 11-26 htlr field descriptions ................................................................................................... .. 11-29 11-27 erdsr field descriptions .................................................................................................. 11-30 11-28 etdsr field descriptions .................................................................................................. 11-31 11-29 emrbr field descriptions.................................................................................................. 11-32 11-30 hardware initialization................................................................................................... ...... 11-33 11-31 ether_en = 0.............................................................................................................. ..... 11-33 11-32 user initialization process ( before ether_en) ................................................................. 11-33 11-33 user initialization (after ether_en) .................................................................................. 11-3 4
MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 xxxiv freescale semiconductor list of tables (continued) table page number title number 11-34 rxbd field descriptions ................................................................................................... .. 11-36 11-35 txbd field descriptions................................................................................................... ... 11-37 12-1 usb device requests........................................................................................................ ... 12-5 12-2 usb memory map............................................................................................................. .... 12-7 12-3 fnr field descriptions ..................................................................................................... .... 12-9 12-4 fnmr field descriptions .................................................................................................... .. 12-9 12-5 rfmr field descriptions .................................................................................................... 12-10 12-6 rfmmr field descriptions ................................................................................................. 12 -11 12-7 far field descriptions ..................................................................................................... .. 12-11 12-8 asr field descriptions ..................................................................................................... .. 12-12 12-9 specr field descripti ons ....................... ........................................... ................................ 1 2-14 12-10 ep0sr field descriptions.................................................................................................. . 12-14 12-11 iep0cfg field descriptions ............................................................................................... 1 2-15 12-12 ep0ctl field descriptions ................................................................................................. 12-17 12-13 epnctl field descriptions ................................................................................................. 12-20 12-14 ep0imr and ep0isr field descriptions ............................................................................ 12-22 12-15 epnisr field descriptions................................................................................................. . 12-25 12-16 epnimr field descriptions ................................................................................................. 12-26 12-17 epndr field descriptions.................................................................................................. . 12-27 12-18 epndpr field descriptions ................................................................................................ 1 2-28 12-19 usb fifo access timing ................................................................................................... 1 2-30 12-20 example fifo setup ........................................................................................................ .. 12-32 13-1 plic module memory map ................................................................................................. 13-1 3 13-2 p0cr?p3cr field descriptions ......................................................................................... 13-19 13-3 plcr field description..................................................................................................... .. 13-20 13-4 p0icr?p3icr field descriptions ....................................................................................... 13-21 13-5 p0psr?p3psr field descriptions ..................................................................................... 13-22 13-6 pasr field descripti ons.......................... ........................................... ............................... . 13-23 13-7 p0gmr?p3gmr field descriptions ................................................................................... 13-24 13-8 p0gmt?p3gmt field descri ptions.................................................................................... 13-25 13-9 pgmta field descriptions.................................................................................................. 1 3-26 13-10 pgmts field descriptions.................................................................................................. 13-27 13-11 p0gcir?p3gcir field descriptions.................................................................................. 13-28 13-12 p0gcit?p3gcit field descriptions................................................................................... 13-29 13-13 pgcitsr field descriptions............................................................................................... 1 3-30 13-14 pdcsr field descriptions .................................................................................................. 13-31 13-15 pdrqr field descriptions.................................................................................................. 13-32 13-16 p0sdr?p3sdr field descriptions..................................................................................... 13-33 13-17 pcsr field descriptions................................................................................................... .. 13-34 14-1 qspi input and output signals and functions ..................................................................... 14-3 14-2 qspi_clk frequency as function of cpu clock and baud rate ....................................... 14-7 14-3 qmr field descriptions ..................................................................................................... ... 14-9 14-4 qdlyr field descriptions .................................................................................................. 1 4-11 14-5 qwr field descriptions..................................................................................................... . 14-12
MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor xxxv list of tables (continued) table page number title number 14-6 qir field descriptions ..................................................................................................... ... 14-13 14-7 qcr0?qcr15 field descriptions....................................................................................... 14-15 15-1 tmrn field descriptions.................................................................................................... ... 15-3 15-2 tern field descriptions .................................................................................................... ... 15-5 16-1 uart module programming model ...................................................................................... 16-3 16-2 umr1n field descriptions ................................................................................................... .16-5 16-3 umr2n field descriptions ................................................................................................... .16-6 16-4 usrn field descriptions .................................................................................................... ... 16-7 16-5 ucsrn field descriptions ................................................................................................... .16-8 16-6 ucrn field descripti ons.......................... ........................................... ............................... ... 16-9 16-7 uipcrn field descriptions ................................................................................................. 1 6-11 16-8 uacrn field descriptions .................................................................................................. 1 6-12 16-9 uisrn/uimrn field descriptions........................................................................................ 16-13 16-10 utfn field descriptions................................................................................................... ... 16-15 16-11 urfn field descriptions ................................................................................................... .. 16-16 16-12 ufpdn field descriptions.................................................................................................. . 16-17 16-13 uipn field descriptions................................................................................................... .... 16-17 16-14 uop1/uop0 field descriptions .......................................................................................... 16-1 8 16-15 uart module signals....................................................................................................... .. 16-19 16-16 transmitter fifo status bits.............................................................................................. . 16-25 16-17 receiver fifo status bits................................................................................................. .. 16-26 17-1 gpio signal multiplexing ................................................................................................... ... 17-1 17-2 gpio port register memory map ......................................................................................... 17-2 17-3 pacnt field descriptions ................................................................................................... .17-3 17-4 port a control register f unction bits ................................................................................... 17- 5 17-5 pbcnt field descriptions ................................................................................................... .17-6 17-6 port b control register f unction bits ................................................................................... 17- 7 17-7 pdcnt field descriptions ................................................................................................... .17-8 17-8 port d control register f unction bits ................................................................................... 17- 9 17-9 paddr field descriptions .................................................................................................. 1 7-10 18-1 pwm module memory map................................................................................................... 18- 2 18-2 pwcrn field descriptions................................................................................................... .18-3 18-3 pwwdn field descriptions................................................................................................... 18-4 19-1 signal descriptions sorted by function ................................................................................ 19-3 19-2 signal name and description by pin number..................................................................... 19-11 19-3 byte strobe operation for 32-bit data bus ......................................................................... 19-20 19-4 byte strobe operation for 16-bit data bus?sram cycles19-21 19-5 byte strobe operation for 16-bit data bus?sdram cycles19-21 19-6 connecting bs[3:0] to dqmx .............................................................................................. 19- 21 19-7 processor status encoding................................................................................................. 1 9-37 19-8 MCF5272 bus width selection19-38
MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 xxxvi freescale semiconductor list of tables (continued) table page number title number 19-9 MCF5272 cs0 memory bus width selection19-38 19-10 MCF5272 high impedance mode selection19-38 20-1 coldfire bus signal summary ............................................................................................. 20 -1 20-2 chip select memory address decoding priority20-4 20-3 byte strobe operation for 32-bit data bus ........................................................................... 20-6 20-4 byte strobe operation for 16-bit data bus?sram cycles20-6 20-5 byte strobe operation for 16-bit data bus?sdram cycles20-6 20-6 data bus requirement for read/write cycles...................................................................... 20-7 20-7 external bus interface codes for csbrs ............................................................................. 20-8 21-1 jtag signals ............................................................................................................... ......... 21-2 21-2 instructions............................................................................................................... ............. 21-7 23-1 maximum supply, input voltage and storage temperature ................................................. 23-1 23-2 operating temperature...................................................................................................... ... 23-2 23-3 thermal resistance ......................................................................................................... ..... 23-2 23-4 dc electrical specifications .............................................................................................. ... 23-3 23-5 i/o driver capability ...................................................................................................... ........ 23-3 23-6 clock input and output timing specifications ...................................................................... 23-5 23-7 processor bus input timing specifications........................................................................... 23-6 23-8 processor bus output timing specifications ........................................................................ 23-8 23-9 debug ac timing specification .......................................................................................... 23-1 3 23-10 sdram interface timing specifications ............................................................................. 23-14 23-11 mii receive signal timing ................................................................................................. . 23-17 23-12 mii transmit signal ti ming ................................................................................................ . 23-18 23-13 mii async inputs signal timing........................................................................................... 2 3-19 23-14 mii serial management channel timing............................................................................. 23-20 23-15 timer module ac timing specifications ............................................................................. 23-21 23-16 uart modules ac timing spec ifications........................................................................... 23-22 23-17 idl master mode timing, plic po rts 1, 2, and 3 ............................................................... 23-23 23-18 idl slave mode timing, plic ports 0?3 ............................................................................ 23-24 23-19 gci slave mode timing, plic ports 0?3............................................................................ 23-25 23-20 gci master mode timing, plic ports 1, 2, 3 .................................................................. 23-26 23-21 general-purpose i/o port ac timing specifications .......................................................... 23-28 23-22 usb interface ac timing spec ifications............................................................................. 23-29 23-23 ieee 1149.1 (jtag) ac timing specifications ............ ........................................... ........... 23-30 23-24 qspi modules ac timing spec ifications ............................................................................ 23-31 23-25 pwm modules ac timing specifications............................................................................ 23-32 a-1 on-chip module base address offsets from mbar...............................................................a-1 a-2 cpu space registers memory map .......................................................................................a-2 a-3 on-chip peripherals and configuration registers memory map ............................................a-2
MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor xxxvii list of tables (continued) table page number title number a-4 interrupt control register memory map..................................................................................a-2 a-5 chip select register memory map .........................................................................................a-3 a-6 gpio port register memory map ...........................................................................................a-3 a-7 qspi module memory map.....................................................................................................a -4 a-8 pwm module memory map.....................................................................................................a- 4 a-9 dma module memory map .....................................................................................................a- 4 a-10 uart0 module memory map..................................................................................................a- 5 a-11 uart1 module memory map..................................................................................................a- 6 a-12 sdram controller memory map.............................................................................................a-7 a-13 timer module memory map .................................................................................................... a-7 a-14 plic module memory map ..................................................................................................... a-8 a-15 ethernet module memory map................................................................................................a -9 a-16 usb module memory map ....................................................................................................a- 10
MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 xxxviii freescale semiconductor
MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor xxxix freescale? and the freescale logo are trade marks of freescale semiconductor, inc. ? freescale semiconductor, inc., 2005. all rights reserved. MCF5272 coldfire ? integrated microprocessor user?s manual to provide the most up-to-date information, the re vision of our documents on the world wide web will be the most current. your printed copy may be an earlier revision. to ve rify you have the latest information available, refer to: http://www.freescale.com/ the following revision history ta ble summarizes changes containe d in this document. for your convenience, the page number designators have been linked to the appropriate location. document revision history rev. no. substantive change(s) 2.1 updated to meet freescale identity guidelines. 3 ? formatting, layout, spelling, and grammar corrections. ? corrected the txfifo bit description in table 16-9 (was ?once set, this bit is cleared by reading utb n ?, is ?after being set, this bit is cleared by writing utb n ?). ? corrected figure 20-12 (oe signal was asserting on the third s dclk clock cycle, is asserting on the second sdclk clock cycle). ? corrected figure 20-13 (r/w and bs signals were asserting on the third sdclk clock cycle, are asserting on the second sdclk clock cycle). ? corrected figure 20-16 (oe signal was asserting on the third s dclk clock cycle, is asserting on the second sdclk clock cycle). ? corrected figure 20-17 (r/w and bs signals were asserting on the third sdclk clock cycle, are asserting on the second sdclk clock cycle).
MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 xl freescale semiconductor about this book the primary objective of this user?s manual is to define the functiona lity of the MCF5272 processors for use by software and hardware developers. the information in this book is subjec t to change without notic e, as described in the disclaimers on the title page of this book. as with any technical documentation, it is the readers? responsibility to be sure he is using the most recent vers ion of the documentation. to locate any published errata or updates for th is document, refer to the world-wide web at http://www.freescale.com . audience this manual is intended for system software and hardware developers and applications programmers who want to develop products with the MCF5272. it is assumed that the re ader understands operating systems, microprocessor system design, basic principles of software and hard ware, and basic details of the coldfire ? architecture. organization following is a summary and br ief description of the major sections of this manual: ? chapter 1, ?overview ,? includes general descrip tions of the modul es and features incorporated in the MCF5272, focussing in particular on new features. ? chapter 2, ?coldfire core ,? provides an overview of the microprocessor core of the MCF5272. the chapter describes the organization of the vers ion 2 (v2) coldfire 5200 processor core and an overview of the program-visible registers (the programming model) as they are implemented on the MCF5272. it also includes a full description of exception handling and a table of instruction timings. ? chapter 3, ?hardware multiply/accumulate (mac) unit ,? describes the MCF5272 multiply/accumulate unit, which executes in teger multiply, multiply-accumulate, and miscellaneous register instructi ons. the mac is integrated into the operand execution pipeline (oep). ? chapter 4, ?local memory .? this chapter describes the mcf5 272 implementation of the coldfire v2 local memory specification. it consis ts of three major se ctions, as follows. ? section 4.3, ?sram overview ,? describes the MCF5272 on- chip static ram (sram) implementation. it covers genera l operations, configurat ion, and initializati on. it also provides information and examples of how to minimi ze power consumption when using the sram. ? section 4.4, ?rom overview ,? describes the MCF5272 on-ch ip static rom. the rom module contains tabular data that the coldfire core can access in a single cycle. ? section 4.5, ?instruc tion cache overview ,? describes the MCF5272 cache implementation, including organization, configurat ion, and coherency. it describes cache operations and how the cache interacts with other memory structures.
MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor xli ? chapter 5, ?debug support ,? describes the revision a hard ware debug support in the MCF5272. ? chapter 6, ?system integration module (sim) ,? describes the sim programming model, bus arbitration, power management, and syst em-protection functions for the MCF5272. ? chapter 7, ?interrupt controller ,? describes operation of the interr upt controller portion of the sim. includes descriptions of the registers in the in terrupt controller memory map and the interrupt priority scheme. ? chapter 8, ?chip select module ,? describes the MCF5272 chip-s elect implementation, including the operation and programming model, which includes the chip-select address, mask, and control registers. ? chapter 9, ?sdram controller ,? describes configuration a nd operation of the synchronous dram controller component of the sim, includi ng a general description of signals involved in sdram operations. it provides in terface information for memory configurations using most common sdram devices for both 16- and 32-bit-wide data buses. the chapter concludes with signal timing diagrams. ? chapter 10, ?dma controller ,? provides an overview of the MCF5272?s one-channel dma controller intended for memory-to-me mory block data transfers. this chapter describes in detail its signals, registers, and operating modes. ? chapter 11, ?ethernet module ,? describes the MCF5272 fast et hernet media access controller (mac). this chapter begins with a feature- set overview, a functional block diagram, and transceiver connection informati on for both mii and seven-wire se rial interfaces. the chapter concludes with detailed descriptions of operation and the programming model. ? chapter 12, ?universal serial bus (usb) ,? provides an overview of the usb module of the MCF5272, including detailed operation info rmation and the usb programming model. connection examples and circuit board la yout considerations are also provided. ? the usb specification, revision 1.1 is a recommended supplement to this chapter. it can be downloaded from http://www.usb.org . chapter 2 of this specification, terms and abbreviations , provides definitions of ma ny of the words found here. ? chapter 13, ?physical layer in terface controller (plic) ,? provides detailed information about the MCF5272?s physical layer interface controller, a module intended to support isdn applications. the chapter begins with a description of operation and a series of related block diagrams starting with a high-level overview. each successive diag ram depicts progressively more internal detail. the chapter then describes timing generation and the programming model and concludes with three application examples. ? chapter 14, ?queued serial peri pheral interface (qspi) module ,? provides a feature-set overview and description of operation, including details of the qspi?s internal ram organization. the chapter concludes with the progr amming model and a timing diagram. ? chapter 15, ?timer module ,? describes configuration and ope ration of the four general-purpose timer modules, timer 0, 1, 2 and 3. ? chapter 16, ?uart modules ,? describes the use of the universal asynchronous/synchronous receiver/transmitters (uarts) implemented on the MCF5272, including example register values for typical configurations.
MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 xlii freescale semiconductor ? chapter 17, ?general purpose i/o module ,? describes the operation and programming model of the three general purpose i/o (g pio) ports on the MCF5272. the ch apter details pin assignment, direction-control, and data registers. ? chapter 18, ?pulse-width modulation (pwm) module ,? describes the conf iguration and operation of the pulse-width modulation (p wm) module. it includes a bloc k diagram, programming model, and timing diagram. ? chapter 19, ?signal descriptions ,? provides a listing and brief description of all the MCF5272 signals. specifically, it shows which are inputs or outputs, how they are multiplexed, and the state of each signal at reset. the fi rst listing is organized by f unction, with signals appearing alphabetically within each functi onal group. this is followed by a second listing sorted by pin number. ? chapter 20, ?bus operation ,? describes the functioning of th e bus for data-transfer operations, error conditions, bus arbitration, and reset operations. it includes detailed timing diagrams showing signal interaction. operation of th e bus is defined for transfers initiated by the MCF5272 as a bus master. the MCF5272 does not support ex ternal bus masters. note that chapter 9, ?sdram controller ,? describes dram cycles. ? chapter 21, ?ieee 1149.1 test access port (jtag) ,? describes configura tion and operation of the MCF5272 joint test action group (jtag) implemen tation. it describes t hose items required by the ieee 1149.1 standard and provides additiona l information specific to the MCF5272. for internal details and sample appl ications, see the ieee 1149.1 document. ? chapter 22, ?mechanical data ,? provides a functional pin listing and package diagram for the MCF5272. ? chapter 23, ?electrical characteristics ,? describes ac and dc elec trical specifications and thermal characteristics for the MCF5272. because additional speeds may have become available since the publication of this book, cons ult freescale?s coldfire web page, http://www.freescale.com , to confirm that this is the latest information. this manual includes the following two appendixes: ? appendix a, ?list of memory maps ,? provides the entire address-map for MCF5272 memory-mapped registers. ? appendix b, ?buffering an d impedance matching ,? provides some suggestions regarding interface circuitry betw een the MCF5272 and sdrams. this manual also includes an index.
MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor xliii suggested reading this section lists additional reading that provides bac kground for the information in this manual as well as general information about the coldfire architecture. general information the following documentation provides useful information about the cold fire architecture and computer architecture in general: coldfire documentation the coldfire documentation is available from the s ources listed on the back cover of this manual. document order numbers are included in parentheses for ease in ordering. ? coldfire programmers reference manual, r1.0 (mcf5200prm/ad) ? user?s manuals?these books provide details about indivi dual coldfire implementations and are intended to be used in conjunction with the coldfire programmers reference manual. these include the following: ? coldfire mcf5102 user?s manual (mcf5102um/ad) ? coldfire mcf5202 user?s manual (mcf5202um/ad) ? coldfire mcf5204 user?s manual (mcf5204um/ad) ? coldfire mcf5206 user?s manual (mcf5206eum/ad) ? coldfire mcf5206e user?s manual (mcf5206eum/ad) ? coldfire mcf5307 user?s manual (mcf5307um/ad) ? coldfire mcf5407 user?s manual (mcf5407um/ad) ? coldfire programmers reference manual, r1.0 (mcf5200prm/ad) ? using microprocessors and microcom puters: the motorola family, william c. wray, ross bannatyne, joseph d. greenfield additional literature on co ldfire implementations is being released as new pro cessors become available. for a current list of coldfire documen tation, refer to the world wide web at http://www.freescale.com .
MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 xliv freescale semiconductor conventions this document uses the foll owing notational conventions: mnemonics in text, instruction mn emonics are shown in uppercase. mnemonics in code and tables, instruction mnemonics are shown in lowercase. italics italics indicate variable command parameters. book titles in text are set in italics. 0x0 prefix to denote hexadecimal number 0b0 prefix to denote binary number reg[field] abbreviations for regist ers are shown in uppercase. sp ecific bits, fields, or ranges appear in brackets. for example, rambar [ba] identifies the base address field in the ram base address register. nibble a 4-bit data unit byte an 8-bit data unit word a 16-bit data unit 1 longword a 32-bit data unit x in some contexts, such as signal encodings, x indicates a don?t care. n used to express an undefined numerical value ? not logical operator & and logical operator | or logical operator 1. the only exceptions to this appear in the discussion of serial communication modules that support variable-length data transmission units. to simplify the discussion these un its are referred to as words regardless of length.
MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor xlv acronyms and abbreviations table i lists acronyms and abbreviati ons used in this document. table i. acronyms and abbreviated terms term meaning adc analog-to-digital conversion alu arithmetic logic unit avec autovector bdm background debug mode bist built-in self test bsdl boundary-scan description language codec code/decode dac digital-to-analog conversion dma direct memory access dsp digital signal processing ea effective address edo extended data output (dram) fifo first-in, first-out gpio general-purpose i/o i 2 c inter-integrated circuit ieee institute for electrical and electronics engineers ifp instruction fetch pipeline ipl interrupt priority level jedec joint electron device engineering council jtag joint test action group lifo last-in, first-out lru least recently used lsb least-significant byte lsb least-significant bit mac multiply accumulate unit, also media access controller mbar memory base address register msb most-significant byte msb most-significant bit mux multiplex nop no operation
MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 xlvi freescale semiconductor oep operand execution pipeline pc program counter pclk processor clock plic physical layer interface controller pll phase-locked loop plru pseudo least recently used por power-on reset pqfp plastic quad flat pack pwm pulse-width modulation qspi queued serial peripheral interface risc reduced instruct ion set computing rx receive sim system integration module sof start of frame tap test access port ttl transistor transistor logic tx transmit uart universal asynchronous/synchronous receiver transmitter usb universal serial bus table i. acronyms and abbreviated terms (continued) term meaning
MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor xlvii terminology conventions table ii shows terminology conventions used throughout this document. table ii. notational conventions instruction operand syntax opcode wildcard cc logical condition (example: ne for not equal) register specifications an any address register n (example: a3 is address register 3) ay,ax source and destination address registers, respectively dn any data register n (example: d5 is data register 5) dy,dx source and destination data registers, respectively rc any control register (example vbr is the vector base register) rm mac registers (acc, mac, mask) rn any address or data register rw destination register w (used for mac instructions only) ry,rx any source and destination registers, respectively xi index register i (can be an address or data register: ai, di) register names acc mac accumulator register ccr condition code register (lower byte of sr) macsr mac status register mask mac mask register pc program counter sr status register port name ddata debug data port pst processor status port miscellaneous operands # immediate data following the 16-b it operation word of the instruction effective address
MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 xlviii freescale semiconductor y,x source and destination effective addresses, respectively assembly language program label list of registers for mo vem instruction (example: d3?d0) shift operation: shift left (<<), shift right (>>) operand data size: byte (b), word (w), longword (l) bc both instruction and data caches dc data cache ic instruction cache # identifies the 4-bit vect or number for trap instructions <> identifies an indirect data address referencing memory identifies an absolute address referencing memory d n signal displacement value, n bits wide (example: d16 is a 16-bit displacement) sf scale factor (x1, x2, x4 for indexed addressing mode, <<1n>> for mac operations) operations + arithmetic addition or postincrement indicator ? arithmetic subtraction or predecrement indicator x arithmetic multiplication / arithmetic division ~ invert; operand is logically complemented & logical and | logical or ^ logical exclusive or << shift left (example: d0 << 3 is shift d0 left 3 bits) >> shift right (example: d0 >> 3 is shift d0 right 3 bits) source operand is moved to destination operand two operands are exchanged sign-extended all bits of the upper portion are made equal to the high-order bit of the lower portion if then else test the condition. if true, the operations after ?then? are performed. if the condition is false and the optional ?else? clause is present, the operations after ?else? are performed. if the condition is false and else is omitted, the instruction performs no operation. refe r to the bcc instruction description as an example. table ii. notational conventions (continued) instruction operand syntax
MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor xlix subfields and qualifiers {} optional operation () identifies an indirect address d n displacement value, n-bits wide (example: d 16 is a 16-bit displacement) address calculated effective address (pointer) bit bit selection (example: bit 3 of d0) lsb least significant bit (example: lsb of d0) lsb least significant byte lsw least significant word msb most significant bit msb most significant byte msw most significant word condition code register bit names ccarry n negative voverflow x extend zzero table ii. notational conventions (continued) instruction operand syntax
MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 l freescale semiconductor register identifiers register identifiers in this user?s manual were changed from names used in early versions of the manual released under non-disclosure agreement (nda). because a si gnificant amount of collateral documentation, such as source code, was de veloped using the ol d register names, table iii through table xvi list the new register names and mnemonics as they should appear in the data book, along with the old ones. identifiers that have changed are displa yed in boldface type. those that have not changed are marked ?no change? in the ?new mnemonic? column. table iii. on-chip peripherals and configuration registers memory map mbar offset register name old mnemonic new mnemonic 0x0000 module base address register, read only mbar no change 0x0004 system configuratio n register scr no change 0x0006 system protection register spr no change 0x0008 power management register pmr no change 0x000e activate low power register alpr no change 0x0010 device identification register dir no change table iv. interrupt control register memory map mbar offset register name old mnemonic new mnemonic 0x0020 interrupt control register 1 icr1 no change 0x0024 interrupt control register 2 icr2 no change 0x0028 interrupt control register 3 icr3 no change 0x002c interrupt control register 4 icr4 no change 0x0030 interrupt source register isr no change 0x0034 programmable interrupt tr ansition register pitr no change 0x0038 programmable interrupt wakeup register piwr no change 0x003f programmable interrupt vector register pivr no change table v. chip select register memory map mbar offset register name old mnemonic new mnemonic 0x0040 cs base register 0 csbr0 no change 0x0044 cs option register 0 csor0 no change 0x0048 cs base register 1 csbr1 no change 0x004c cs option register 1 csor1 no change
MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor li 0x0050 cs base register 2 csbr2 no change 0x0054 cs option register 2 csor2 no change 0x0058 cs base register 3 csbr3 no change 0x005c cs option register 3 csor3 no change 0x0060 cs base register 4 csbr4 no change 0x0064 cs option register 4 csor4 no change 0x0068 cs base register 5 csbr5 no change 0x006c cs option register 5 csor5 no change 0x0070 cs base register 6 csbr6 no change 0x0074 cs option register 6 csor6 no change 0x0078 cs base register 7 csbr7 no change 0x007c cs option register 7 csor7 no change table vi. gpio port register memory map mbar offset register name old mnemonic new mnemonic 0x0080 port a control register pacnt no change 0x0084 port a data direction register paddr no change 0x0086 port a data register padat no change 0x0088 port b control register pbcnt no change 0x008c port b data direction register pbddr no change 0x008e port b data register pbdat no change 0x0094 port c data direction register pcddr no change 0x0096 port c data register pcdat no change 0x0098 port d control register pdcnt no change table vii. qspi module memory map mbar offset register name old mnemonic new mnemonic 0x00a0 qspi mode register spmode qmr 0x00a4 qspi delay register spdelay qdlyr 0x00a8 qspi wrap register spwrap qwr table v. chip select register memory map (continued) mbar offset register name old mnemonic new mnemonic
MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 lii freescale semiconductor 0x00ac qspi interrupt register spint qir 0x00b0 qspi address register spaddr qar 0x00b4 qspi data register spdata qdr table viii. pwm module memory map mbar offset register name old mnemonic new mnemonic 0x00c0 pwm control register 0 pwmcr1 pwcr0 0x00c4 pwm control register 1 pwmcr2 pwcr1 0x00c8 pwm control register 2 pwmcr3 pwcr2 0x00d0 pwm pulse-width register 0 pwmwd1 pwwd0 0x00d4 pwm pulse-width register 1 pwmwd2 pwwd1 0x00d8 pwm pulse-width register 2 pwmwd3 pwwd2 table ix. dma module memory map mbar offset register name old mnemonic new mnemonic 0x00e0 dma mode register dcmr no change 0x00e6 dma interrupt r egister dcir no change 0x00e8 dma byte count register dbcr no change 0x00ec dma source address register dsar no change 0x00f0 dma destination address register ddar no change table x. uart0 module memory map mbar offset register name old mnemonic new mnemonic 0x0100 uart0 mode register 1/2 u1mr1/u1mr2 u0mr1/u0mr2 0x0104 uart0 status u1sr u0sr 0x0104 uart0 clock select register u1csr u0csr 0x0108 uart0 command register u1cr u0cr 0x010c uart0 receive buffer u1rxb u0rxb 0x010c uart0 transmit buffer u1txb u0txb table vii. qspi module memory map (continued) mbar offset register name old mnemonic new mnemonic
MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor liii 0x0110 uart0 cts change register u1ccr u0ccr 0x0110 uart0 auxiliary control register u1acr u0acr 0x0114 uart0 interrupt status register u1isr u0isr 0x0114 uart0 interrupt mask register u1imr u0imr 0x0118 uart0 baud prescaler msb u1bg1 u0bg1 0x011c uart0 baud prescaler lsb u1bg2 u0bg2 0x0120 uart0 autobaud msb register u1abr1 u0abr1 0x0124 uart0 autobaud lsb register u1abr2 u0abr2 0x0128 uart0 txfifo control/ status register u1txfcsr u0txfcsr 0x012c uart0 rxfifo control/ status register u1rxfcsr u0rxfcsr 0x0134 uart0 cts unlatched input u1ip u0ip 0x0138 uart0 rts o/p bit set command register u1op1 u0op1 0x013c uart0 rts o/p bit reset command register u1op0 u0op0 table xi. uart1 module memory map mbar offset register name old mnemonic new mnemonic 0x0140 uart1 mode register 1/2 u2mr1/u2mr2 u1mr1/u1mr2 0x0144 uart1 status u2sr u1sr 0x0144 uart1 clock select register u2csr u1csr 0x0148 uart1 command register u2cr u1cr 0x014c uart1 receive buffer u2rxb u1rxb 0x014c uart1 transmit buffer u2txb u1txb 0x0150 uart1 cts change register u2ccr u1ccr 0x0150 uart1 auxiliary control register u2acr u1acr 0x0154 uart1 interrupt status register u2isr u1isr 0x0154 uart1 interrupt mask register u2imr u1imr 0x0158 uart1 baud prescaler msb u2bg1 u1bg1 0x015c uart1 baud prescaler lsb u2bg2 u1bg2 0x0160 uart1 autobaud msb register u2abr1 u1abr1 0x0164 uart1 autobaud lsb register u2abr2 u1abr2 0x0168 uart1 txfifo control/ status register u2txfcsr u1txfcsr table x. uart0 module memory map (continued) mbar offset register name old mnemonic new mnemonic
MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 liv freescale semiconductor 0x016c uart1 rxfifo control/ status register u2rxfcsr u1rxfcsr 0x0174 uart1 cts unlatched input u2ip u1ip 0x0178 uart1 rts o/p bit set command register u2op1 u1op1 0x017c uart1 rts o/p bit reset command register u2op0 u1op0 table xii. sdram controller memory map mbar offset register name old mnemonic new mnemonic 0x0182 sdram configuration register sdccr sdcr 0x0186 sdram timing register sdctr sdtr table xiii. timer module memory map mbar offset register name old mnemonic new mnemonic 0x0200 timer 0 mode register tmr1 tmr0 0x0204 timer 0 reference register trr1 trr0 0x0208 timer 0 capture register tcr1 tcap0 0x020c timer 0 counter register tcn1 tcn0 0x0210 timer 0 event register ter1 ter0 0x0220 timer 1 mode register tmr2 tmr1 0x0224 timer 1 reference register trr2 trr1 0x0228 timer 1 capture register tcr2 tcap1 0x022c timer 1 counter register tcn2 tcn1 0x0230 timer 1 event register ter2 ter1 0x0240 timer 2 mode register tmr3 tmr2 0x0244 timer 2 reference register trr3 trr2 0x0248 timer 2 capture register tcr3 tcap2 0x024c timer 2 counter register tcn3 tcn2 0x0250 timer 2 event register ter3 ter2 0x0260 timer 3 mode register tmr4 tmr3 0x0264 timer 3 reference register trr4 trr3 0x0268 timer 3 capture register tcr4 tcap3 table xi. uart1 module memory map (continued) mbar offset register name old mnemonic new mnemonic
MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor lv 0x026c timer 3 counter register tcn4 tcn3 0x0270 timer 3 event register ter4 ter3 0x0280 watchdog reset reference register wrrr no change 0x0284 watchdog interrupt reference register wirr no change 0x0288 watchdog counter register wcr no change 0x028c watchdog event register wer no change table xiv. plic module memory map mbar offset register name old mnemonic new mnemonic 0x0300 port0 b1 data receive plrb10 p0b1rr 0x0304 port1 b1 data receive plrb11 p1b1rr 0x0308 port2 b1 data receive plrb12 p2b1rr 0x030c port3 b1 data receive plrb13 p3b1rr 0x0310 port0 b2 data receive plrb20 p0b2rr 0x0314 port1 b2 data receive plrb21 p1b2rr 0x0318 port2 b2 data receive plrb22 p2b2rr 0x031c port3 b2 data receive plrb23 p3b2rr 0x0320 port0-3 d data receive plrd0 plrd1 plrd2 plrd3 p0drr p1drr p2drr p3drr 0x0328 port0 b1 data transmit pltb10 p0b1tr 0x032c port1 b1 data transmit pltb11 p1b1tr 0x0330 port2 b1 data transmit pltb12 p2b1tr 0x0334 port3 b1 data transmit pltb13 p3b1tr 0x0338 port0 b2 data transmit pltb20 p0b2tr 0x033c port1 b2 data transmit pltb21 p1b2tr 0x0340 port2 b2 data transmit pltb22 p2b2tr 0x0344 port3 b2 data transmit pltb23 p3b2tr 0x0348 port0-3 d data transmit pltd0 pltd1 pltd2 pltd3 p0dtr p1dtr p2dtr p3dtr table xiii. timer module memory map (continued) mbar offset register name old mnemonic new mnemonic
MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 lvi freescale semiconductor 0x0350 port0-1 gci/idl configuration register plcr0 plcr1 p0cr p1cr 0x0354 port2-3 gci/idl configuration register plcr2 plcr3 p2cr p3cr 0x0358 port0-1 interrupt configuration register plicr0 plicr1 p0icr p1icr 0x035c port2-3 interrupt configuration register plicr2 plicr3 p2icr p3icr 0x0360 port0-1 gci monitor rx plgmr0 plgmr1 p0gmr p1gmr 0x0364 port2-3 gci monitor rx plgmr2 plgmr3 p2gmr p3gmr 0x0368 port0-1 gci monitor tx plgmt0 plgmt1 p0gmt p1gmt 0x036c port2-3 gci monitor tx plgmt2 plgmt3 p2gmt p3gmt 0x0370 gci monitor tx status gci monitor tx abort plgmts plgmta pgmts pgmta 0x0374 port0-3 gci c/i rx plgcir0 plgcir1 plgcir2 plgcir3 p0gcir p1gcir p2gcir p3gcir 0x0378 port0-3 gci c/i tx plgcit0 plgcit1 plgcit2 plgcit3 p0gcit p1gcit p2gcit p3gcit 0x037c gci c/i tx status pgcitsr no change 0x0384 port0-1 periodic status plpsr0 plpsr1 p0psr p1psr 0x0388 port2-3 periodic status plpsr2 plpsr3 p2psr p3psr 0x038c aperiodic interrupt status register; loop back control plasr pllcr pas r plcr 0x0392 d channel request pldrq pdrqr 0x0394 port0-1 sync delay plsd0 plsd1 p0sdr p1sdr 0x0398 port2-3 sync delay plsd2 plsd3 p2sdr p3sdr 0x039c clock select plcksel pcsr table xiv. plic module memory map (continued) mbar offset register name old mnemonic new mnemonic
MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor lvii table xv. ethernet module memory map mbar offset register name old mnemonic new mnemonic 0x0840 ethernet control register ecntrl ecr 0x0844 ethernet in terrupt event register ievent eir 0x0848 ethernet interrupt mask register imask eimr 0x084c ethernet interrupt vector status ivec ivsr 0x0850 ethernet rx ring updated flag r_des_active rdar 0x0854 ethernet tx ring updated flag x_des_active tdar 0x0880 ethernet mii data register mii_data mmfr 0x0884 ethernet mii speed register mii_speed mscr 0x08cc ethernet receive bound register r_bound frbr 0x08d0 ethernet rx fifo start address r_fstart frsr 0x08e4 transmit fifo watermark x_wmrk tfwr 0x08ec ethernet tx fifo start address x_fstart tfsr 0x0944 ethernet rx control register r_cntrl rcr 0x0948 maximum frame length register max_frm_len mflr 0x0984 ethernet tx control register x_cntrl tcr 0x0c00 ethernet address (lower) addr_low malr 0x0c04 ethernet address (upper) addr_high maur 0x0c08 ethernet hash table (upper) hash_table_high htur 0x0c0c ethernet hash table (lower) hash_table_low htlr 0x0c10 ethernet rx descriptor ring r_des_start erdsr 0x0c14 ethernet tx descriptor rin x_des_start etdsr 0x0c18 ethernet rx buffer size r_buff_size emrbr 0x0c40? 0x0dff fifo ram e_fifo efifo table xvi. usb module memory map mbar offset register name old mnemonic new mnemonic 0x1002 usb frame number register usbfnr fnr 0x1006 usb frame number match register usbfnmr fnmr 0x100a usb real-time frame monitor register usbrtfmr rfmr 0x100e usb real-time frame monitor match register usbrtfmmr rfmmr
MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 lviii freescale semiconductor 0x1013 usb function address register usbfar far 0x1014 usb alternate se tting register usbasr asr 0x1018 usb device request data1 register usbdrr1 drr1 0x101c usb device request data2 register usbdrr2 drr2 0x1022 usb specification number register usbspecr specr 0x1026 usb endpoint 0 status register usbepsr0 ep0sr 0x1028 usb endpoint 0 in config register usbepicfg0 iep0cfg 0x102c usb endpoint 0 out config register usbepocfg0 oep0cfg 0x1030 usb endpoint 1 config uration register usbepcfg1 ep1cfg 0x1034 usb endpoint 2 config uration register usbepcfg2 ep2cfg 0x1038 usb endpoint 3 config uration register usbepcfg3 ep3cfg 0x103c usb endpoint 4 config uration register usbepcfg4 ep4cfg 0x1040 usb endpoint 5 config uration register usbepcfg5 ep5cfg 0x1044 usb endpoint 6 config uration register usbepcfg6 ep6cfg 0x1048 usb endpoint 7 config uration register usbepcfg7 ep7cfg 0x104c usb endpoint 0 c ontrol register usbepctl0 ep0ctl 0x1052 usb endpoint 1 c ontrol register usbepctl1 ep1ctl 0x1056 usb endpoint 2 c ontrol register usbepctl2 ep2ctl 0x105a usb endpoint 3 c ontrol register usbepctl3 ep3ctl 0x105e usb endpoint 4 c ontrol register usbepctl4 ep4ctl 0x1062 usb endpoint 5 c ontrol register usbepctl5 ep5ctl 0x1066 usb endpoint 6 c ontrol register usbepctl6 ep6ctl 0x106a usb endpoint 7 c ontrol register usbepctl7 ep7ctl 0x106c usb general/endpoi nt 0 interrupt status register usbepisr0 ep0isr 0x1072 usb endpoint 1 interrupt status register usbepisr1 ep1isr 0x1076 usb endpoint 2 interrupt status register usbepisr2 ep2isr 0x107a usb endpoint 3 interrupt status register usbepisr3 ep3isr 0x107e usb endpoint 4 interrupt status register usbepisr4 ep4isr 0x1082 usb endpoint 5 interrupt status register usbepisr5 ep5isr 0x1086 usb endpoint 6 interrupt status register usbepisr6 ep6isr 0x108a usb endpoint 7 interrupt status register usbepisr7 ep7isr 0x108c usb endpoint 0 interrupt mask register usbepimr0 ep0imr table xvi. usb module memory map (continued) mbar offset register name old mnemonic new mnemonic
MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor lix note the mbar offset column corresponds to the tables found in appendix a, ?list of memory maps .? 16- and/or 8-bit wide registers may be offset by 0, 1, 2, or 3 bytes from the offset address shown above. refer to the appropriate discussions in this docum ent for actual positioning of 16- or 8-bit registers in a 32-bit long word. 0x1092 usb endpoint 1 interrupt mask register usbepimr1 ep1imr 0x1096 usb endpoint 2 interrupt mask register usbepimr2 ep2imr 0x109a usb endpoint 3 interrupt mask register usbepimr3 ep3imr 0x109e usb endpoint 4 interrupt mask register usbepimr4 ep4imr 0x10a2 usb endpoint 5 interrupt mask register usbepimr5 ep5imr 0x10a6 usb endpoint 6 interrupt mask register usbepimr6 ep6imr 0x10aa usb endpoint 7 interrupt mask register usbepimr7 ep7imr 0x10ac usb endpoint 0 data register usbepdat0 ep0dr 0x10b0 usb endpoint 1 da ta register usbepdat1 ep1dr 0x10b4 usb endpoint 2 da ta register usbepdat2 ep2dr 0x10b8 usb endpoint 3 data register usbepdat3 ep3dr 0x10bc usb endpoint 4 data register usbepdat4 ep4dr 0x10c0 usb endpoint 5 da ta register usbepdat5 ep5dr 0x10c4 usb endpoint 6 data register usbepdat6 ep6dr 0x10c8 usb endpoint 7 data register usbepdat7 ep7dr 0x10ce usb endpoint 0 data present register usbepdp0 ep0dpr 0x10d2 usb endpoint 1 data present register usbepdp1 ep1dpr 0x10d6 usb endpoint 2 data present register usbepdp2 ep2dpr 0x10da usb endpoint 3 data present register usbepdp3 ep3dpr 0x10de usb endpoint 4 data present register usbepdp4 ep4dpr 0x10e2 usb endpoint 5 data present register usbepdp5 ep5dpr 0x10e6 usb endpoint 6 data present register usbepdp6 ep6dpr 0x10ea usb endpoint 7 data present register usbepdp7 ep7dpr 0x1400? 0x17ff usb configuration ram, 1 k bytes usb_cfg_ram no change table xvi. usb module memory map (continued) mbar offset register name old mnemonic new mnemonic
MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 lx freescale semiconductor
MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 1-1 chapter 1 overview this chapter provides an overview of the mc f5272 microprocessor features, including the major functional components. 1.1 MCF5272 key features a block diagram of the MCF5272 is shown in figure 1-1 . the main features are as follows: ? static version 2 coldfire va riable-length risc processor ? 32-bit address and data path on-chip ? 66-mhz processor core and bus frequency ? sixteen general-purpose 32-bit data and address registers ? multiply-accumulate unit (mac) for dsp and fast multiply operations ? on-chip memories ? 4-kbyte sram on cpu internal bus ? 16-kbyte rom on cpu internal bus ? 1-kbyte instruction cache ? power management ? fully-static operation with proces sor sleep and whole-chip stop modes ? very rapid response to interrupts from th e low-power sleep mode (wake-up feature) ? clock enable/disable for each peripheral when not used ? software-controlled disable of external clock input for virt ually zero power consumption (low-power stop mode) ? two universal asynchronous/synchronous receiver transmitters (uarts) ? full-duplex operation ? based on mc68681 dual-uart (duart) programming model ? flexible baud rate generator ? modem control signals available (cts and rts ) ? processor interrupt and wakeup capability ? enhanced tx, rx fifos, 24 bytes each
overview MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 1-2 freescale semiconductor figure 1-1. MCF5272 block diagram jtag v2 coldfire processor complex 4-kbyte sram 1-kbyte sram controller rambar 4-entry store buffer 31 0 local memory local data bus instruction cache acr0 acr1 cacr local memory instruction unit cache controller 16-kbyte rom rom controller rombar instruction fetch fifo instruction buffer (3 x 32) decode, select, operand fetch address generation, execute ifp oep d[31:0] instruction address generation memory instruction bus sdram controller external bus interface system integration module (sim) 32-bit address bus 32-bit data bus interrupt controller cs [7:0] 88 8 4 icrs mbar piwr csors csbrs int [6:1] 6 dram controller outputs pivr pitr isr wrrr wirr alpr pmr system control base address dir identification sdram control sdcr parallel port four two uarts dma ethernet general- purpose timers control signals chip select module spr scr wcr wer usb qspi plic pac n t ? pdcnt paddr? pcddr pa d r ? pcdr sdram timer sdtr pwm
overview MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 1-3 ? ethernet module ? 10 baset capability, half or full duplex ? 100 baset capability, half duplex a nd limited throughput full duplex (MCF5272) ? on-chip transmit and receive fifos ? off-chip flexible buffer descriptor rings ? media-independent interface (mii) ? universal serial bus (usb) module ? 12 mbps (full speed) ? fully compatible wi th usb 1.1 specifications ? eight endpoints (control, bul k, interrupt rx, isochronous) ? endpoint fifos ? selectable on-chip analog interface ? external memory interface ? external glueless 8, 16, and 32- bit sram and rom interface bus ? sdram controller sup ports 16?256 mbit devices ? external bus configurable for 16 or 32 bits width for sdram ? glueless interface to sram devices with or without byte strobe inputs ? programmable wait state generator ? queued serial peripheral interface (qspi) ? full-duplex, three-wire synchronous transfer ? up to four chip selects available ? master operation ? programmable master bit rates ? up to 16 preprogrammed transfers ? timer module ? 4x16-bit general-purpo se multi-mode timer ? input capture and output compar e pins for timers 1 and 2 ? programmable prescaler ? 15-ns resolution at 66-mhz clock frequency ? software watchdog timer ? software watchdog can generate interrupt before reset ? processor interrupt for each timer ? pulse-width modulation (pwm) unit ? three identical channels ? independent prescaler tap point ? period/duty range variable
overview MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 1-4 freescale semiconductor ? system integration module (sim) ? system configuration including intern al and external address mapping ? system protection by hardware watchdog ? versatile programmable ch ip-select signals with wa it-state generation logic ? up to three 16-bit para llel input/output ports ? latchable interrupt inputs with progr ammable priority and edge triggering ? programmable interrupt vect ors for on-chip peripherals ? physical layer interfac e controller (plic) ? allows connection using general circuit interface (gci) or inte rchip digital link (idl) physical layer protocols for 2b + d data ? three physical interfaces ? four time-division multiplex (tdm) ports ? ieee 1149.1 boundary-scan test access port (jtag) for board-level testing ? operating voltage: 3.3 v 0.3 v ? operating temperature: 0 ?70 c ? operating frequency: dc to 66 mhz, from external cmos oscillator ? compact ultra low-profile 196 ball-molded plastic ball -grid array package (pgba) 1.2 MCF5272 architecture this section briefly describes the MCF5272 core, sim, uart, and timer modules, and test access port. 1.2.1 version 2 coldfire core based on the concept of variable-length risc te chnology, coldfire combines the simplicity of conventional 32-bit risc architectures with a memory-saving, variable-l ength instruction set. the main features of the MCF5272 core are as follows: ? 32-bit address bus directly addre sses up to 4 gbytes of address space ? 32-bit data bus ? variable-length risc ? optimized instruction set for high-level language constructs ? sixteen general-purpose 32-bit data and address registers ? mac unit for dsp applications ? supervisor/user modes for system protection ? vector base register to re locate exception-vector table ? special core interfacing sign als for integrated memories ? full debug support
overview MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 1-5 the version 2 coldfire core has a 32-bit address bus and a 32-bit data bus. the addr ess bus allows direct addressing of up to 4 gbytes. it supports misaligned data accesses and a bus arbi tration unit for multiple bus masters. the version 2 coldfire s upports an enhanced subset of the 68000 instruction set. the mac provides new instructions for dsp applications ; otherwise, version 2 coldfire user code runs unchanged on 68020, 68030, 68040, and 68060 processors. the rem oved instructions include bcd, bit field, logical rotate, decrement and branch, integer divisi on, and integer multiply with a 64- bit result. also, four indirect addressing modes have been eliminated. the coldfire 2 core incorporates a complete de bug module that provides real-time trace, background debug mode, and real-time debug support. 1.2.2 system integration module (sim) the MCF5272 sim provides the external bus interface for the coldfire 2 architectur e. it also eliminates most or all of the glue lo gic that typically supports the microprocessor and its in terface with the peripheral and memory system. the sim provi des programmable circui ts to perform address-decoding and chip selects, wait-state insertion, in terrupt handling, clock generation, discrete i/o, and power management features. 1.2.2.1 external bus interface the external bus interface (ebi) handl es the transfer of information betw een the internal core and memory, peripherals, or other processing elemen ts in the external address space. 1.2.2.2 chip select and wait state generation programmable chip select outputs provide signals to enable exte rnal memory and peripheral circuits, providing all handshaking a nd timing signals for automatic wait-s tate insertion and data bus sizing. base memory address and bl ock size are programmable, with some re strictions. for example, the starting address must be on a boundary that is a multiple of th e block size. each chip se lect is general purpose; however, any one of the chip selects can be programmed to provide read and write enable signals suitable for use with most popular static rams and periphera ls. data bus width (8-bit , 16-bit, or 32-bit) is programmable on all chip selects, and further decodi ng is available for protection from user mode access or read-only access. 1.2.2.3 system configuration and protection the sim provides configuration regi sters that allow general system functions to be controlled and monitored. for example, all on-chip registers can be relo cated as a block by pr ogramming a module base address, power management modes can be selected, and the source of the most recent reset or berr can be checked. the hardware watchdog features can be enabled or disa bled, and the bus time-out period can be programmed. a software watchdog timer is also provided for system protection. if pr ogrammed, the timer causes a reset to the MCF5272 if it is not re freshed periodically by software.
overview MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 1-6 freescale semiconductor 1.2.2.4 power management the sleep and stop power manageme nt modes reduce power consumpti on by allowing software to shut down the core, peripherals, or the whole device dur ing inactive periods. to reduce power consumption further, software can individually disable internal clocks to the on-chip peripheral modules. the power-saving modes are described as follows: ? sleep mode uses interrupt control logic to allow any interrupt condition to wake the processor. as the MCF5272 is fully static, sleep mode is simply the di sabling of the core?s clock after the current instruction completes. an interrupt from any inte rnal or external source causes on-chip power management logic to reenable th e core?s clock; execution resumes with the next instruction. this allows rapid return from power -down state as compared to a dynamic implementation that must perform power-on reset processing before software can handle the interrupt request. if interrupts are enabled at the appropriate priority level, progra m control passes to the re levant interrupt service routine. ? stop mode is entered by the disabl ing of the external clock input a nd is achieved by software setting a bit in a control register. program execution st ops after the current instruction. in stop mode, neither the core nor peripherals are active. the MCF5272 consumes ve ry little power in this mode. to resume normal operation, the external inte rrupts cause the power management logic to re-enable the external clock input. the mcf 5272 resumes program execu tion from where it entered stop mode (if no interrupt are pending), or starts interrupt exception processing if interrupts are pending. 1.2.2.5 parallel input/output ports the MCF5272 has up to three 16-bit gene ral-purpose parallel ports, each li ne of which can be programmed as either an input or output. some port lines have dedicated pins and ot hers are shared with other MCF5272 functions. some outputs have high drive current capability. 1.2.2.6 interrupt inputs the MCF5272 has flexible latched in terrupt inputs each of which can generate a separate, maskable interrupt with programmable interrupt priority level and triggering e dge (falling or rising). each interrupt has its own interrupt vector. 1.2.3 uart module the MCF5272 has two full-duplex uart modules with an on-chip baud rate generator providing both standard and non-standard baud rates up to 5 mbps. the module is functionally equivalent to the mc68681 duart with enhanced features incl uding 24-byte tx and rx fifos. data formats can be 5, 6, 7, or 8 bits with even, odd, or no parity and up to 2 stop bits in 1/16-bit increments. re ceive and transmit fifos minimize cpu service calls. a wide variety of erro r detection and maskable interrupt capability is provided. using a programmable prescaler or an external source, the MCF5272 system cloc k supports various baud rates. modem support is provi ded with request-to-send (rts ) and clear-to-send (cts ) lines available externally. full-duplex autoecho l oopback, local loopback, and remote loopback modes can be selected.
overview MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 1-7 the uart can be programmed to interrupt or wake up the cpu on various normal or abnormal events. to reduce power consumption, the uart can be disabled by softwa re if not in use. 1.2.4 timer module the timer module contains five timers arrange d in two submodules. one submodule contains a programmable software watc hdog timer. the other contains four i ndependent, identical general-purpose timer units, each containing a free-running 16-bit timer for use in various m odes, including capturing the timer value with an external event, counting external events, or triggering an external signal or interrupting the cpu when the timer reaches a set value. each un it has an 8-bit prescaler fo r deriving the clock input frequency from the system clock or external clock input. the output pi n associated with each timer has programmable modes. to reduce power consumption, the timer module can be disabled by software. 1.2.5 test access port for system diagnostics and manufac turing testing, the MCF5272 includes us er-accessible test logic that complies with the ieee 1149.1 standard for boundary scan testing, often re ferred to as jtag (joint test action group). the ieee 1149.1 standard provides more information. 1.3 system design this section presents issues to consider when designing with the MCF5272. it describes differences between the MCF5272 (core and peri pherals) and various other standard components that are replaced by moving to an integrated device like the MCF5272. 1.3.1 system bus configuration the MCF5272 has flexibility in its system bus interf acing due to the dynamic bus sizing feature in which 32-,16-, and 8-bit data bus si zes are programmable on a per-chip sele ct basis. the progr ammable nature of the strobe signals (including oe /rd , r/w , bs [3:0], and cs n ) should ensure that exte rnal decode logic is minimal or nonexistent. configurat ion software is required upon power -on reset before chip-selected devices can be used, except for chip select 0 (cs0 ), which is active after pow er-on reset until programmed otherwise. busw1 and busw0 select the initial data bus width for cs0 only. a wake-up from sleep mode or a restart from stop mode does not require reconfiguration of the chip select registers or other system configuration registers. 1.4 MCF5272-specific features this section describes featur es peculiar to the MCF5272. 1.4.1 physical layer inte rface controller (plic) the physical layer interface controlle r (plic) allows the MCF5272 to c onnect at a physical level with external codecs and other periphera l devices that use either the gene ral circuit interface (gci), or
overview MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 1-8 freescale semiconductor interchip digital link (idl), physical layer protocols. this module is primarily intended to facilitate designs that include isdn interfaces. 1.4.2 pulse-width modulation (pwm) unit the pwm unit is intended for use in c ontrol applications. with a suitable lo w-pass filter, it can be used as a digital-to-analog converter. this module generates a synchronous series of pulses. the duty cycle of the pulses is under software control. its main features include the following: ? double-buffered width register ? variable-divide prescale ? three identical, inde pendent pwm modules ? byte-wide width register provides programmable contro l of duty cycle. the pwm implements a simple free-r unning counter with a width register and comparator such that the output is cleared when the counter exceeds the value of the width register. when the counter wraps around, its value is not greater than the wi dth register value, and the output is set high. with a suitable low-pass filter, the pwm can be used as a digital-to-analog converter. 1.4.3 queued serial peripheral interface (qspi) the qspi module provides a serial pe ripheral interface with queued tran sfer capability. it supports up to 16 stacked transfers at a time, making cpu interv ention between transfers u nnecessary. transfer rams in the qspi are indirectly accessible using address and da ta registers. functionality is similar to the qspi portion of the qsm (queued serial module) implemented in the mc68332. the qspi has the following features: ? programmable queue to support up to 16 transfers without user intervention ? supports transfer sizes of 8 to 16 bits in 1-bit increments ? four peripheral chip-select lines for control of up to 15 devices ? baud rates from 129.4 kbps to 33 mbps at 66 mhz. ? programmable delays before and after transfers ? programmable clock phase and polarity ? supports wrap-around mode for continuous transfers 1.4.4 universal serial bus (usb) module the usb controller on the MCF5272 supports devi ce mode data communications with a usb host (typically a pc). one host and up to 127 attach ed peripherals share usb bandwidth through a host-scheduled, token-based pr otocol. the usb uses a tier ed star topology with a hub at the center of each star. each wire segment is a point-to-point conne ction between the host connector and a peripheral connector.
MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 2-1 chapter 2 coldfire core this chapter provides an overview of the microproce ssor core of the MCF5272. the chapter describes the v2 programming model as it is implemented on the MCF5272. it also includes a full description of exception handling, data formats, an instruction set summary, and a table of instruction timings. 2.1 features and enhancements the MCF5272 is the most highly-inte grated v2 standard product, cont aining a variety of communications and general-purpose peripherals. the v2 core was designed to maximi ze code density and performance while minimizing die area. the following list summ arizes MCF5272 features: ? variable-length risc vers ion 2 microprocessor core ? two independent, decoupled pipelines?two-stage instruction fetch pipeli ne (ifp) and two-stage operand execution pipeline (oep) ? three longword fifo buffer provides decoupling between the pipelines ? 32-bit internal address bus supporti ng 4 gbytes of linear address space ? 32-bit data bus ? 16 user-accessible, 32-bit-wi de, general-purpose registers ? supervisor/user modes for system protection ? vector base register to re locate exception-vector table ? optimized for high-level language constructs 2.1.1 decoupled pipelines the ifp prefetches instructions. th e oep decodes instructions, fetche s required operands, then executes the specified function. the two inde pendent, decoupled pipeline struct ures maximize performance while minimizing core size. pipeli ne stages are shown in figure 2-1 and are summarized as follows: ? two-stage ifp (plus optional instruction buffer stage) ? instruction address genera tion (iag) calculates the next prefetch address. ? instruction fetch cycle (ic) initiates prefet ch on the processor?s local instruction bus. ? instruction buffer (ib) optional stage uses fifo queue to minimize effects of fetch latency. ? two-stage oep ? decode, select/operand fetch (dsoc) decode s the instruction and selects the required components for the effective address cal culation, or the operand fetch cycle. ? address generation/execute (age x) calculates the operand addr ess, or performs the execution of the instruction.
coldfire core MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 2-2 freescale semiconductor figure 2-1. coldfire pipeline 2.1.1.1 instruction fetch pipeline (ifp) the ifp generates instruction addresses and fetche s. because the fetch and execution pipelines are decoupled by a three longword fifo buffer, the ifp ca n prefetch instructions be fore the oep needs them, minimizing stalls. 2.1.1.2 operand execution pipeline (oep) the oep is a two-stage pipeline feat uring a traditional risc datapath with a register file feeding an arithmetic/logic unit (alu). for simp le register-to-register instruct ions, the first stage of the oep performs the instruction decode and fetching of the required register operands (oc), while the actual instruction execution is perfor med in the second stage (ex). for memory-to-register instructions , the instruction is effectively staged through the oep twice in the following way: ? the instruction is decoded and the component s of the operand addres s are selected (ds). ? the operand address is generate d using the execute engine (ag). ? the memory operand is fetched while any regi ster operand is simulta neously fetched (oc). ? the instruction is executed (ex). instruction instruction fifo decode & select, address data[31:0] iag ic ib dsoc agex address [31:0] instruction buffer address generation fetch cycle generation, execute operand fetch operand execution pipeline instruction fetch pipeline
coldfire core MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 2-3 for register-to-memory operations, the stage func tions (ds/oc, ag/ex) are effectively performed simultaneously allowing single-cycle execution. fo r read-modify-write instructions, the pipeline effectively combines a memory-to-regi ster operation with a store operation. 2.1.1.2.1 illegal opcode handling on version 2 coldfire implementations, only so me illegal opcodes (0x0000 and 0x4afc) are decoded and generate an illegal instruction exception. additionally, attempting to ex ecute an illegal line a or line f opcode generates unique exception types. if any other unsupported opcode is executed, the resulting operation is undefined. 2.1.1.2.2 hardware multiply /accumulate (mac) unit the mac is an optional unit in vers ion 2 that provides hard ware support for a limite d set of digital signal processing (dsp) operations used in embedded code, while supporting the in teger multiply instructions in the coldfire microprocessor family. the mac features a three-stage ex ecution pipeline, optimized for 16 x 16 multiplies. it is tightly coupled to the oe p, which can issue a 16 x 16 multiply with a 32-bit accumulation plus fetch a 32-bit ope rand in a single cycle. a 32 x 32 mu ltiply with a 32-bit accumulation requires three cycles before the next instruction can be issued. figure 2-2 shows basic functionality of the mac. a full set of instructions are provided for signed and unsigned integers plus signed, fixe d-point fractiona l input operands. figure 2-2. coldfire multiply-accumulate functionality diagram the mac provides functionality in the following three related areas, which are described in detail in chapter 3, ?hardware multiply/accumulate (mac) unit .? ? signed and unsigned integer multiplies ? multiply-accumulate oper ations with signed and unsigned fractional operands ? miscellaneous register operations x +/- operand y operand x shift 0,1,-1 accumulator
coldfire core MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 2-4 freescale semiconductor 2.1.1.2.3 hardware divide unit the hardware divide unit performs the following integer division operations: ? 32-bit operand/16-bit operand producing a 16- bit quotient and a 16-bit remainder ? 32-bit operand/32-bit opera nd producing a 32-bit quotient ? 32-bit operand/32-bit operand producing a 32-bit remainder 2.1.2 debug module enhancements the coldfire processor core debug interface supports system integration in c onjunction with low-cost development tools. real-time tra ce and debug information can be acce ssed through a standard interface, which allows the processor and system to be debugged at full speed without costly in-circuit emulators. on-chip breakpoint resources include the following: ? configuration/status register (csr) ? bus attributes and mask register (aatr) ? breakpoint registers. these can be used to de fine triggers combining address, data, and pc conditions in single- or dual-level de finitions. they include the following: ? pc breakpoint register (pbr) ? pc breakpoint mask register (pbmr) ? data operand address breakpoi nt registers (abhr/ablr) ? data breakpoint register (dbr) ? data breakpoint mask register (dbmr) ? trigger definition register (tdr) can be programmed to generate a processor halt or initiate a debug interrupt exception these registers can be accessed thr ough the dedicated debug serial comm unication channel, or from the processor?s supervisor programming m odel, using the wdebug instruction. 2.2 programming model the MCF5272 programming model consists of three instruction and register groups?user, mac (also user-mode), and supervisor, shown in figure 2-2 . user mode programs are re stricted to user and mac instructions and programming models . supervisor-mode system software can reference al l user-mode and mac instructions and registers and a dditional supervisor instructions a nd control registers. the user or supervisor programming model is selected based on sr[s]. the follow ing sections descri be the registers in the user, mac, and supervisor programming models. 2.2.1 user programming model as figure 2-3 shows, the user programming model consists of the following registers: ? 16 general-purpose 32-bit re gisters, d0?d7 and a0?a7 ? 32-bit program counter ? 8-bit condition code register
coldfire core MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 2-5 figure 2-3. coldfire programming model 2.2.1.1 data registers (d0?d7) registers d0?d7 are used as data re gisters for bit, byte (8-bit), wo rd (16-bit), and longword (32-bit) operations. they may also be used as index registers. 2.2.1.2 address registers (a0?a6) the address registers (a0?a6) can be used as software stack pointer s, index registers, or base address registers and may be used for word and longword operations. 2.2.1.3 stack pointer (a7, sp) the processor core supports a single hardware stack po inter (a7) used during st acking for subroutine calls, returns, and exception handling. the stack pointer is implicitly referenced by cer tain operations and can be explicitly referenced by any instruction specifying an address register. the initia l value of a7 is loaded 31 0 d0 data registers d1 d2 d3 d4 d5 d6 d7 31 0 a0 address registers a1 a2 a3 a4 a5 a6 a7 stack pointer pc program counter ccr condition code register 31 0 macsr mac status register acc mac accumulator mask mac mask register 15 31 19 (ccr) sr status register must be zeros vbr vector base register cacr cache control register acr0 access control register 0 acr1 access control register 1 rombar rom base address register rambar ram base address register mbar module base address register user registers supervisor registers
coldfire core MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 2-6 freescale semiconductor from the reset exception vector, a ddress 0x0000. the same register is used for user and s upervisor modes, and may be used for word and longword operations. a subroutine call saves the pr ogram counter (pc) on the st ack and the return restores the pc from the stack. the pc and the status re gister (sr) are saved on the stack during exception a nd interrupt processing. the return from exception instruction restor es sr and pc values from the stack. 2.2.1.4 program counter (pc) the pc holds the address of the executing instru ction. for sequential instructions, the processor automatically increments the pc. when program flow changes, the pc is updated with the target instruction. for some instructions, the pc specifies the ba se address for pc-relative operand addressing modes. 2.2.1.5 condition code register (ccr) the ccr, figure 2-4 , occupies sr[7?0], as shown in figure 2-3 . ccr[4?0] are indicator flags based on results generated by arithmetic operations. 76543210 field ? x n z v c reset 000 undefined r/w r r/w r/w r/w r/w r/w figure 2-4. condition code register (ccr) ccr fields are described in table 2-1 . table 2-1. ccr field descriptions bits name description 7?5 ? reserved, should be cleared. 4 x extend condition code bit. assigned the value of th e carry bit for arithmetic operations; otherwise not affected or set to a specified result. also used as an input operand for multiple-precision arithmetic. 3 n negative condition code bit. set if the ms b of the result is set; otherwise cleared. 2 z zero condition code bit. set if the result equals zero; otherwise cleared. 1 v overflow condition code bi t. set if an arithmetic overflow occurs , implying that the result cannot be represented in the operand size; otherwise cleared. 0 c carry condition code bit. set if a carry-out of the data operand msb occurs for an addition or if a borrow occurs in a subtraction; otherwise cleared.
coldfire core MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 2-7 2.2.1.6 mac programming model figure 2-3 shows the registers in the mac portion of th e user programming model. these registers are described as follows: ? accumulator (acc)?this 32-bit, re ad/write, general-purpose regist er is used to accumulate the results of mac operations. ? mask register (mask)?this 16-bi t general-purpose register provid es an optional address mask for mac instructions that fetch operands from memory. it is useful in the implementation of circular queues in operand memory. ? mac status register (macsr)? this 8-bit register defines c onfiguration of the mac unit and contains indicator flags affected by mac instructions. unless not ed otherwise, macsr indicator flag settings are based on the fi nal result, that is, the result of the final operation involving the product and accumulator. 2.2.2 supervisor programming model the MCF5272 supervisor programming model is shown in figure 2-3 . typically, system programmers use the supervisor programming model to implement operating system functi ons and provide memory and i/o control. the supe rvisor programming mode l provides access to the user regi sters and additional supervisor registers, which include the upper byte of the status register (sr), the vector base register (vbr), and registers for configuring attributes of the address space connected to the version 2 processor core. most supervisor-mode registers are accessed by using th e movec instruction with the control register definitions in table 2-2 . table 2-2. movec register map rc[11?0] register definition 0x002 cache control register (cacr) 0x004 access control register 0 (acr0) 0x005 access control register 1 (acr1) 0x801 vector base register (vbr) 0xc00 rom base address register 0xc04 ram base address register (rambar) 0xc0f module base address register (mbar)
coldfire core MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 2-8 freescale semiconductor 2.2.2.1 status register (sr) the sr stores the processor status, the interrupt priority ma sk, and other control bits . supervisor software can read or write the en tire sr; user software can read or write only sr[7?0], described in section 2.2.1.5, ?condition code register (ccr) .? the control bits indi cate processor states?trace mode (t), supervisor or user mode (s), and master or in terrupt state (m). sr is set to 0x27 xx after reset. table 2-3 describes sr fields. 2.2.2.2 vector base register (vbr) the vbr holds the base address of the exception ve ctor table in memory. the displacement of an exception vector is added to the va lue in this register to access th e vector table. vbr[19?0] are not implemented and are assumed to be zero, forcing th e vector table to be a ligned on a 0-modulo-1-mbyte boundary. 15 8 7 0 system byte condition code register (ccr) field t ? s m ? i ? x n z v c reset00100 111 000 ????? r/w r/w r r/w r/w r r/w r r/w r/w r/w r/w r/w figure 2-5. status register (sr) table 2-3. status field descriptions bits name description 15 t trace enable. when t is set, the processor pe rforms a trace exception after every instruction. 13 s supervisor/user state. indicates whether th e processor is in supervisor or user mode 0 user mode 1 supervisor mode 12 m master/interrupt state. cleared by an interrupt exc eption. it can be set by software during execution of the rte or move to sr instructions so the os can emulate an interrupt stack pointer. 10?8 i interrupt priority mask. defines the current interrupt priority. interrupt requests are inhibited for all priority levels less than or equal to the current priority, except the edge-sensitive level-7 request, which cannot be masked. 7?0 ccr condition code register. see figure 2-4 . 31 20 19 0 field exception vector table base address ? reset 0000_0000_0000_0000_0000_0000_0000_0000 r/w written from a bdm serial command or from the cpu using the movec instruct ion. vbr can be read from the debug module only. the upper 12 bits are returned, the low-order 20 bits are undefined. rc[11?0] 0x801 figure 2-6. vector base register (vbr)
coldfire core MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 2-9 2.2.2.3 cache control register (cacr) the cacr controls operation of the instruction and data cache memory. it includes bits for enabling, freezing, and invalidating cache contents. it also incl udes bits for defining the default cache mode and write-protect fields. see section 4.5.3.1, ?cache cont rol register (cacr) .? 2.2.2.4 access control registers (acr0?acr1) the access control registers (acr0?a cr1) define attributes for tw o user-defined memory regions. attributes include definition of cache mode, write protect, and buffer write enables. see section 4.5.3.2, ?access control regist ers (acr0 and acr1) .? 2.2.2.5 rom base address register (rombar) the rombar base address register determines th e base address of the internal rom module and indicates the types of references mapped to it. the rombar includes a base addr ess, write-pr otect bit, address space mask bits, and an enable. note that the MCF5272 rom contains data for the hdlc module and is not user programmable. see section 4.4.2.1, ?rom base address register (rombar) .? 2.2.2.6 ram base address register (rambar) the rambar register determines th e base address location of the internal sram module and indicates the types of references mapped to it. the rambar includes a base addr ess, write-protect bit, address space mask bits, and an enable. the ram base addr ess must be aligned on a 0-modulo-4-kbyte boundary. see section 4.3.2.1, ?sram base address register (rambar) .? 2.2.2.7 module base address register (mbar) the module base address register (mbar) defines the logical base a ddress for the memory-mapped space containing the control registers for the on-chip peripherals. see section 6.2.2, ?module base address register (mbar) .? 2.3 integer data formats table 2-4 lists the integer operand data formats. integer operands can reside in registers, memory, or instructions. the operand size for each instruction is either explicitly encoded in the instruction or implicitly defined by the instruction operation. table 2-4. integer data formats operand data format size bit 1 bit byte integer 8 bits word integer 16 bits longword integer 32 bits
coldfire core MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 2-10 freescale semiconductor 2.4 organization of data in registers the following sections describe data organization within the data, address, and control registers. 2.4.1 organization of integer data formats in registers figure 2-7 shows the integer format for data registers. each integer data re gister is 32 bits wide. byte and word operands occupy the lower 8- and 16-bit portions of integer data registers, respectively. longword operands occupy the entire 32 bits of integer data regist ers. a data register that is either a source or destination operand only uses or changes the appropria te lower 8 or 16 bits in byte or word operations, respectively. the remaining high-orde r portion does not change. the least significant bit (lsb) of all integer sizes is zero, the most-significant bit (msb) of a l ongword integer is 31, the msb of a word integer is 15, and the msb of a byte integer is 7. the instruction set encodings do not allow the use of address registers for byt e-sized operands. when an address register is a source opera nd, either the low-order word or th e entire longword operand is used, depending on the operation size. word-l ength source operands are sign-exte nded to 32 bits and then used in the operation with an address regi ster destination. when an address re gister is a destination, the entire register is affected, regard less of the operation size. figure 2-8 shows integer formats for address registers. the size of control registers varies according to function. some have undefined bits reserved for future definition by freescale. those partic ular bits read as zeros and must be written as zeros for future compatibility. all operations to the sr and ccr ar e word-size operations. for all ccr operations, the upper byte is read as all zeros and is ignored when wr itten, regardless of privilege mode. 31 30 1 0 msb lsb bit (0 e bit number e 31) 31 87610 not used msb low order byte lsb byte (8 bits) 31 16 15 14 1 0 not used msb lower order word lsb word (16 bits) 31 30 1 0 msb longword lsb longword (32 bits) figure 2-7. organization of integer data formats in data registers 31 16 15 0 sign-extended 16-bit address operand 31 0 full 32-bit address operand figure 2-8. organization of integer data formats in address registers
coldfire core MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 2-11 2.4.2 organization of intege r data formats in memory all coldfire processors use a bi g-endian addressing scheme. the byte-addressable organization of memory allows lower addresses to correspond to hi gher order bytes. the address n of a longword data item corresponds to the address of th e high-order word. the lower order word is located at address n + 2. the address n of a word data item corresponds to th e address of the high-order byte. the lower order byte is located at address n + 1. th is organization is shown in figure 2-9 . 31 24 23 16 15 8 7 0 longword 0x0000_0000 word 0x0000_0000 word 0x0000_0002 byte 0x0000_0000 byte 0x0000_0001 byte 0x0000_0002 byte 0x0000_0003 longword 0x0000_0004 word 0x0000_0004 word 0x0000_0006 byte 0x0000_0004 byte 0x0000_0005 byte 0x0000_0006 byte 0x0000_0007 . . . longword 0xffff_fffc word 0xffff_fffc word 0xffff_fffe byte 0xffff_fffc byte 0xffff_fffd byte 0xffff_fffe byte 0xffff_ffff figure 2-9. memory operand addressing
coldfire core MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 2-12 freescale semiconductor 2.5 addressing mode summary addressing modes are categorized by how they are used. data addres sing modes refer to data operands. memory addressing modes refer to memory operands . alterable addressing modes refer to alterable (writable) data operands. c ontrol addressing modes refer to memory operands without an associated size. these categories sometimes combine to form more re strictive categories. two combined classifications are alterable memory (both alterable and memory) and data alterable (bot h alterable and data). twelve of the most commonly used effective addressing mode s from the m68000 family ar e available on coldfire microprocessors. table 2-5 summarizes these mode s and their categories. table 2-5. coldfire effective addressing modes addressing modes syntax mode field reg. field category data memory control alterable register direct data address dn an 000 001 reg. no. reg. no. x ? ? ? ? ? x x register indirect address address with postincrement address with predecrement address with displacement (an) (an)+ ?(an) (d 16 , an) 010 011 100 101 reg. no. reg. no. reg. no. reg. no. x x x x x x x x x ? ? x x x x x address register indirect with scaled index 8-bit displacement (d 8 , an, xi*sf) 110 reg. no. x x x x program counter indirect with displacement (d 16 , pc) 111 010 x x x ? program counter indirect with scaled index 8-bit displacement (d 8 , pc, xi*sf) 111 011 x x x ? absolute data addressing short long (xxx).w (xxx).l 111 111 000 001 x x x x x x ? ? immediate # 111 100 x x ? ?
coldfire core MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 2-13 2.6 instruction set summary the coldfire instruction set is a simplified version of the m68000 instruction set. the removed instructions include bcd, bit field, logical rotate, decrement and branc h, and integer multiply with a 64-bit result. nine new mac instru ctions have been added. table 2-6 lists notational conventions used throughout this manual. table 2-6. notational conventions instruction operand syntax opcode wildcard cc logical condition (example: ne for not equal) register specifications an any address register n (example: a3 is address register 3) ay,ax source and destination address registers, respectively dn any data register n (example: d5 is data register 5) dy,dx source and destination data registers, respectively rc any control register (example vbr is the vector base register) rm mac registers (acc, mac, mask) rn any address or data register rw destination register w (used for mac instructions only) ry,rx any source and destination registers, respectively xi index register i (can be an address or data register: ai, di) register names acc mac accumulator register ccr condition code register (lower byte of sr) macsr mac status register mask mac mask register pc program counter sr status register port names ddata debug data port pst processor status port miscellaneous operands # immediate data following the 16-b it operation word of the instruction effective address
coldfire core MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 2-14 freescale semiconductor y,x source and destination effective addresses, respectively assembly language program label list of registers for mo vem instruction (example: d3?d0) shift operation: shift left (<<), shift right (>>) operand data size: byte (b), word (w), longword (l) bc instruction cache # identifies the 4-bit vect or number for trap instructions <> identifies an indirect data address referencing memory identifies an absolute address referencing memory dn signal displacement value, n bits wide (example: d16 is a 16-bit displacement) sf scale factor (x1, x2, x4 for indexed addressing mode, <<1n>> for mac operations) operations + arithmetic addition or postincrement indicator ? arithmetic subtraction or predecrement indicator x arithmetic multiplication / arithmetic division ~ invert; operand is logically complemented & logical and | logical or ^ logical exclusive or << shift left (example: d0 << 3 is shift d0 left 3 bits) >> shift right (example: d0 >> 3 is shift d0 right 3 bits) source operand is moved to destination operand two operands are exchanged sign-extended all bits of the upper portion are made equal to the high-order bit of the lower portion if then else test the condition. if the condition is true, the operatio ns in the then clause are performed. if the condition is false and the optional else clause is present, the operations in the else clause are performed. if the condition is false and the else clause is omitted, th e instruction performs no operation. refer to the bcc instruction description as an example. table 2-6. notational conventions (continued) instruction operand syntax
coldfire core MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 2-15 2.6.1 instruction set summary table 2-7 lists implemented user-mode instructions by opcode. subfields and qualifiers {} optional operation () identifies an indirect address d n displacement value, n-bits wide (example: d 16 is a 16-bit displacement) address calculated effective address (pointer) bit bit selection (example: bit 3 of d0) lsb least significant bit (example: lsb of d0) lsb least significant byte lsw least significant word msb most significant bit msb most significant byte msw most significant word condition code register bit names ccarry n negative voverflow x extend zzero table 2-7. user-mode instruction set summary instruction operand synt ax operand size operation add dy,x y,dx .l .l source + destination destination adda y,ax .l source + destination destination addi #,dx .l immediate data + destination destination addq #,x .l immediate data + destination destination addx dy,dx .l source + destination + x destination and dy,x y,dx .l .l source & destination destination andi #,dx .l immediate data & destination destination asl dy,dx #,dx .l .l x/c (dx << dy) 0 x/c (dx << #) 0 asr dy,dx #,dx .l .l msb (dx >> dy) x/c msb (dx >> #) x/c bcc .b,.w if condition true, then pc + 2 + d n pc table 2-6. notational conventions (continued) instruction operand syntax
coldfire core MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 2-16 freescale semiconductor bchg dy,x #,x .b,.l .b,.l ~( of destination) z, bit of destination bclr dy,x #,x .b,.l .b,.l ~( of destination) z; 0 bit of destination bra .b,.w pc + 2 + d n pc bset dy,x #,x .b,.l .b,.l ~( of destination) z; 1 bit of destination bsr .b,.w sp ? 4 sp; next sequential pc (sp); pc + 2 + d n pc btst dy,x #,x .b,.l .b,.l ~( of destination) z clr y,dx .b,.w,.l 0 destination cmp y,ax .l destination ? source cmpa y,dx .l destination ? source cmpi y,dx .l destination ? immediate data divs y,dx y,dx .w .l dx /y dx {16-bit remainder; 16-bit quotient} dx /y dx {32-bit quotient} signed operation divu y,dx dy,x .w .l dx /y dx {16-bit remainder; 16-bit quotient} dx /y dx {32-bit quotient} unsigned operation eor dy,x .l source ^ destination destination eori #,dx .l immediate data ^ destination destination ext #,dx .b .w .w .l sign-extended destination destination extb dx .b .l sign-extended destination destination halt 1 none unsized enter halted state jmp y unsized address of pc jsr y unsized sp ? 4 sp; next sequential pc (sp); pc lea y,ax .l ax link ax,# .w sp ? 4 sp; ax (sp); sp ax; sp + d16 sp lsl dy,dx #,dx .l .l x/c (dx << dy) 0 x/c (dx << #) 0 lsr dy,dx #,dx .l .l 0 (dx >> dy) x/c 0 (dx >> #) x/c mac ry,rxsf .l + (.w .w) .l .l + (.l .l) .l acc + (ry rx){<< 1 | >> 1} acc acc + (ry rx){<< 1 | >> 1} acc; (y{&mask}) rw macl ry,rxsf,y,rw .l + (.w .w) .l, .l .l + (.l .l) .l, .l acc + (ry rx){<< 1 | >> 1} acc acc + (ry rx){<< 1 | >> 1} acc; (y{&mask}) rw move y,x .b,.w,.l y x table 2-7. user-mode instruction set summary (continued) instruction operand synt ax operand size operation
coldfire core MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 2-17 move from mac mask,rx acc,rx macsr,rx .l rm rx macsr,ccr .l macsr ccr move to mac ry,acc ry,macsr ry,mask .l ry rm #,acc #,macsr #,mask .l # rm move from ccr ccr,dx .w ccr dx move to ccr dy,ccr #,ccr .b dy ccr # ccr movea y,ax .w,.l .l source destination movem #,x y,# .l .l listed registers destination source listed registers moveq #,dx .b .l sign-extended immediate data destination msac ry,rxsf .l - (.w .w) .l .l - (.l .l) .l acc ? (ry rx){<< 1 | >> 1} acc msacl ry,rxsf,y,rw .l - (.w .w) .l, .l .l - (.l .l) .l, .l acc ? (ry rx){<< 1 | >> 1} acc; (y{&mask}) rw muls y,dx .w x .w .l .l x .l .l source destination destination signed operation mulu y,dx .w x .w .l .l x .l .l source destination destination unsigned operation neg dx .l 0 ? destination destination negx dx .l 0 ? destination ? x destination nop none unsized synchronize pipelines; pc + 2 pc not dx .l ~ destination destination or y,dx dy,x .l source | destination destination ori #,dx .l immediate data | destination destination pea y .l sp ? 4 sp; address of (sp) pulse none unsized set pst= 0x4 rems ,dx .l dx/y dw {32-bit remainder} signed operation remu ,dx .l dx/y dw {32-bit remainder} unsigned operation rts none unsized (sp) pc; sp + 4 sp scc dx .b if condition true, then 1s ? destination; else 0s destination table 2-7. user-mode instruction set summary (continued) instruction operand synt ax operand size operation
coldfire core MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 2-18 freescale semiconductor table 2-8 describes supervisor-mode instructions. sub y,dx dy,x .l .l destination ? source destination suba y,ax .l destination ? source destination subi #,dx .l destination ? immediate data destination subq #,x .l destination ? immediate data destination subx dy,dx .l destination ? source ? x destination swap dx .w msw of dx lsw of dx trap # unsized sp ? 4 sp;pc (sp); sp ? 2 sp;sr (sp); sp ? 2 sp; format (sp); vector address pc trapf none # unsized .w .l pc + 2 pc pc + 4 pc pc + 6 pc tst y .b,.w,.l set condition codes unlk ax unsized ax sp; (sp) ax; sp + 4 sp wddata y .b,.w,.l y ddata port 1 by default the halt instruction is a supervisor-mode instructi on; however, it can be configur ed to allow user-mode execution by setting csr[uhe]. table 2-8. supervisor-mode instruction set summary instruction operand syntax operand size operation cpushl (bc),(ax) unsized invalidate instruction cache line halt 1 1 the halt instruction can be configured to al low user-mode execution by setting csr[uhe]. none unsized enter halted state move from sr sr, dx .w sr dx move to sr dy,sr #,sr .w source sr movec ry,rc .l ry rc rc register definition 0x002 cache control register (cacr) 0x004 access control register 0 (acr0) 0x005 access control register 1 (acr1) 0x801 vector base register (vbr) 0xc00 rom base address register (rombar) 0xc04 ram base address register (rambar) 0xc0f module base address register (mbar) rte none unsized (sp+2) sr; sp+4 sp; (sp) pc; sp + formatfield ? sp stop # .w immediate data sr; enter stopped state wdebug y .l y debug module table 2-7. user-mode instruction set summary (continued) instruction operand synt ax operand size operation
coldfire core MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 2-19 2.7 instruction timing the timing data presented in this section assumes the following: ? the oep is loaded with the opword and all requ ired extension words at the beginning of each instruction execution. this implies that the oe p spends no time waiting for the ifp to supply opwords and/or extension words. ? the oep experiences no sequence-related pipe line stalls. for the MCF5272,the most common example of this type of stall involves c onsecutive store operations, excluding the movem instruction. for all store operations (except m ovem), certain hardware resources w ithin the processor are marked as busy for two clock cycl es after the final dsoc cycle of the store instruction. if a subsequent store instruction is encountered within this two-cycle window, it is stalled until the resource again becomes available. thus, the ma ximum pipeline stall involving consecutive store operations is two cycles. ? the oep can complete all memory accesses wit hout memory causing any stall conditions. thus, timing details in this section assume an infinite zero-wait state memory attached to the core. ? all operand data accesses are a ssumed to be aligned on the same byte boundary as the operand size: ? 16-bit operands aligned on 0-modulo-2 addresses ? 32-bit operands aligned on 0-modulo-4 addresses operands that do not meet th ese guidelines are misaligned. table 2-9 shows how the core decomposes a misaligned operand referenc e into a series of aligned accesses. table 2-9. misaligned operand references a[1:0] size bus operatio ns additional c(r/w) 1 1 each timing entry is presented as c(r/w), described as follows: c is the number of processor clock cycles, including all applicable operand fetches and writes, as well as all internal core cycles required to complete the instruction execution. r/w is the number of operand reads (r) and writes (w) required by the instruction. an operation performing a read-modify write function is denoted as (1/1). x1 word byte, byte 2(1/0) if read 1(0/1) if write x1 long byte, word, byte 3(2/0) if read 2(0/2) if write 10 long word, word 2(1/0) if read 1(0/1) if write
coldfire core MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 2-20 freescale semiconductor 2.7.1 move instruction execution times the execution times for the mo ve.{b,w,l} instructions are shown in the next tables. table 2-12 shows the timing for the other generic move operations. note for all tables in this s ection, the execution time of any instruction using the pc-relative effective addressing modes is equivalent to the time using comparable an-relative mode. et with { = (d16,pc)} equals et with { = (d16,an)} et with { = (d8,pc,xi*sf)} equals et with { = (d8,an,xi*sf)} the nomenclature ?(xxx).wl? refers to both forms of absolute addressing, (xxx).w and (xxx).l. table 2-10 lists execution times for move.{b,w} instructions. table 2-10. move byte and word execution times source destination rx (ax) (ax)+ ?(ax) (d16,ax) (d8,ax,xi*sf) (xxx).wl dy 1(0/0) 1(0/1) 1(0/1) 1( 0/1) 1(0/1) 2(0/1) 1(0/1) ay 1(0/0) 1(0/1) 1(0/1) 1( 0/1) 1(0/1) 2(0/1) 1(0/1) (ay) 3(1/0) 3(1/1) 3(1/1) 3( 1/1) 3(1/1) 4(1/1) 3(1/1) (ay)+ 3(1/0) 3(1/1) 3(1/1) 3 (1/1) 3(1/1) 4(1/1) 3(1/1) ?(ay) 3(1/0) 31/1) 3(1/1) 3(1/1) 3(1/1) 4(1/1) 3(1/1) (d16,ay) 3(1/0) 3(1/1) 3(1/1) 3(1/1) 3(1/1) ? ? (d8,ay,xi*sf) 4(1/0) 4 (1/1) 4(1/1) 4(1/1) ? ? ? (xxx).w 3(1/0) 3(1/1) 3(1/1) 3(1/1) ? ? ? (xxx).l 3(1/0) 3(1/1) 3(1/1) 3(1/1) ? ? ? (d16,pc) 3(1/0) 3(1/1) 3(1/1) 3(1/1) 3(1/1) ? ? (d8,pc,xi*sf) 4(1/0) 4 (1/1) 4(1/1) 4(1/1) ? ? ? # 1(0/0) 3(0/1) 3(0/1) 3(0/1) ? ? ?
coldfire core MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 2-21 table 2-11 lists timings for move.l. table 2-12 gives execution times for move.l instructio ns accessing program-visible registers of the mac unit, along with other move.l timings. execu tion times for moving contents of the acc or macsr into a destination location repr esent the best-case scenario when the store instruction is executed and no load, mac, or msac instructions are in th e mac execution pipeline. in general, these store operations require only one cycle for execution, but if they are preceded immediately by a load, mac, or msac instruction, the mac pipeline depth is exposed and execution time is three cycles. table 2-11. move long execution times source destination rx (ax) (ax)+ ?(ax) (d16,ax) (d8,ax,xi*sf) (xxx).wl dy 1(0/0) 1(0/1) 1(0/1) 1( 0/1) 1(0/1) 2(0/1) 1(0/1) ay 1(0/0) 1(0/1) 1(0/1) 1( 0/1) 1(0/1) 2(0/1) 1(0/1) (ay) 2(1/0) 2(1/1) 2(1/1) 2( 1/1) 2(1/1) 3(1/1) 2(1/1) (ay)+ 2(1/0) 2(1/1) 2(1/1) 2 (1/1) 2(1/1) 3(1/1) 2(1/1) ?(ay) 2(1/0) 2(1/1) 2(1/1) 2 (1/1) 2(1/1) 3(1/1) 2(1/1) (d16,ay) 2(1/0) 2(1/1) 2(1/1) 2(1/1) 2(1/1) ? ? (d8,ay,xi*sf) 3(1/0) 3(1/1) 3(1/1) 3(1/1) ? ? ? (xxx).w 2(1/0) 2(1/1) 2(1/1) 2(1/1) ? ? ? (xxx).l 2(1/0) 2(1/1) 2(1/1) 2(1/1) ? ? ? (d16,pc) 2(1/0) 2(1/1) 2(1/1) 2(1/1) 2(1/1) ? ? (d8,pc,xi*sf) 3(1/0) 3(1/1) 3(1/1) 3(1/1) ? ? ? # 1(0/0) 2(0/1) 2(0/1) 2(0/1) ? ? ? table 2-12. move execution times opcode effective address rn (an) (an)+ ?(an) (d16,an) (d 8,an,xi*sf) (xxx).wl # move.l ,acc 1(0/0) ? ? ? ? ? ? 1(0/0) move.l ,macsr 2(0/0) ? ? ? ? ? ? 2(0/0) move.l ,mask 1(0/0) ? ? ? ? ? ? 1(0/0) move.l acc,rx 1(0/0) ? ? ? ? ? ? ? move.l macsr,ccr 1(0/0) ? ? ? ? ? ? ? move.l macsr,rx 1(0/0) ? ? ? ? ? ? ? move.l mask,rx 1(0/0) ? ? ? ? ? ? ?
coldfire core MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 2-22 freescale semiconductor 2.7.2 execution timings?one-operand instructions table 2-13 shows standard timings for single-operand instructions. 2.7.3 execution timings?two-operand instructions table 2-14 shows standard timings fo r two-operand instructions. table 2-13. one-operand instruction execution times opcode effective address rn (an) (an)+ -(an) (d16,an) (d8,an,xi*sf) (xxx).wl #xxx clr.b 1(0/0) 1(0/1) 1(0/1) 1(0/1) 1(0/1) 2(0/1) 1(0/1) ? clr.w 1(0/0) 1(0/1) 1(0/1) 1(0/1) 1(0/1) 2(0/1) 1(0/1) ? clr.l 1(0/0) 1(0/1) 1(0/1) 1(0/1) 1(0/1) 2(0/1) 1(0/1) ? ext.w dx 1(0/0) ? ? ? ? ? ? ? ext.l dx 1(0/0) ? ? ? ? ? ? ? extb.l dx 1(0/0) ? ? ? ? ? ? ? neg.l dx 1(0/0) ? ? ? ? ? ? ? negx.l dx 1(0/0) ? ? ? ? ? ? ? not.l dx 1(0/0) ? ? ? ? ? ? ? scc dx 1(0/0) ? ? ? ? ? ? ? swap dx 1(0/0) ? ? ? ? ? ? ? tst.b 1(0/0) 3(1/0) 3(1/0) 3( 1/0) 3(1/0) 4(1/0) 3(1/0) 1(0/0) tst.w 1(0/0) 3(1/0) 3(1/0) 3( 1/0) 3(1/0) 4(1/0) 3(1/0) 1(0/0) tst.l 1(0/0) 2(1/0) 2(1/0) 2( 1/0) 2(1/0) 3(1/0) 2(1/0) 1(0/0) table 2-14. two-operand instruction execution times opcode effective address rn (an) (an)+ ?(an) (d16,an) (d8,an,xi*sf) (xxx).wl # add.l ,rx 1(0/0) 3(1/0) 3(1/0) 3 (1/0) 3(1/0) 4(1/0) 3(1/0) 1(0/0) add.l dy, ? 3(1/1) 3(1/1) 3(1/1) 3(1/1) 4(1/1) 3(1/1) ? addi.l #imm,dx 1(0/0) ? ? ? ? ? ? ? addq.l #imm, 1(0/0) 3(1/1) 3(1/ 1) 3(1/1) 3(1/1) 4(1/1) 3(1/1) ? addx.l dy,dx 1(0/0) ? ? ? ? ? ? ? and.l ,rx 1(0/0) 3(1/0) 3(1/0) 3 (1/0) 3(1/0) 4(1/0) 3(1/0) 1(0/0) and.l dy, ? 3(1/1) 3(1/1) 3(1/1) 3(1/1) 4(1/1) 3(1/1) ? andi.l #imm,dx 1(0/0) ? ? ? ? ? ? ? asl.l ,dx 1(0/0) ? ? ? ? ? ? 1(0/0) asr.l ,dx 1(0/0) ? ? ? ? ? ? 1(0/0) bchg dy, 2(0/0) 4(1/1) 4(1/1) 4(1/1) 4(1/1) 5(1/1) 4(1/1) ? bchg #imm, 2(0/0) 4(1/1) 4(1/1) 4(1/1) 4(1/1) ? ? ?
coldfire core MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 2-23 bclr dy, 2(0/0) 4(1/1) 4(1/1) 4(1/1) 4(1/1) 5(1/1) 4(1/1) ? bclr #imm, 2(0/0) 4(1/1) 4(1/1) 4(1/1) 4(1/1) ? ? ? bset dy, 2(0/0) 4(1/1) 4(1/1) 4(1/1) 4(1/1) 5(1/1) 4(1/1) ? bset #imm, 2(0/0) 4(1/1) 4(1/1) 4(1/1) 4(1/1) ? ? ? btst dy, 1(0/0) 3(1/0) 3(1/0) 3(1/0) 3(1/0) 4(1/0) 3(1/0) ? btst #imm, 1(0/0) 3(1/0) 3(1/0) 3(1/0) 3(1/0) ? ? ? cmp.l ,rx 1(0/0) 3(1/0) 3(1/0) 3 (1/0) 3(1/0) 4(1/0) 3(1/0) 1(0/0) cmpi.l #imm,dx 1(0/0) ? ? ? ? ? ? ? divs.w ,dx 20(0/0) 23(1/0) 23(1/0) 23(1/0) 23(1/0) 24(1/0) 23(1/0) 20(0/0) divu.w ,dx 20(0/0) 23(1/0) 23(1/0) 23(1/0) 23(1/0) 24(1/0) 23(1/0) 20(0/0) divs.l ,dx 35(0/0) 38(1/0) 38(1/0) 38(1/0) 38(1/0) ? ? ? divu.l ,dx 35(0/0) 38(1/0) 38(1/0) 38(1/0) 38(1/0) ? ? ? eor.l dy, 1(0/0) 3(1/1) 3(1/ 1) 3(1/1) 3(1/1) 4(1/1) 3(1/1) ? eori.l #imm,dx 1(0/0) ? ? ? ? ? ? ? lea ,ax ? 1(0/0) ? ? 1(0/0) 2(0/0) 1(0/0) ? lsl.l ,dx 1(0/0) ? ? ? ? ? ? 1(0/0) lsr.l ,dx 1(0/0) ? ? ? ? ? ? 1(0/0) mac.w ry,rx 1(0/0) ? ? ? ? ? ? ? mac.l ry,rx 3(0/0) ? ? ? ? ? ? ? msac.w ry,rx 1(0/0) ? ? ? ? ? ? ? msac.l ry,rx 3(0/0) ? ? ? ? ? ? ? mac.w ry,rx,ea,rw ? 3(1/0 ) 3(1/0) 3(1/0) 3(1/0) ? ? ? mac.l ry,rx,ea,rw ? 5(1/0 ) 5(1/0) 5(1/0) 5(1/0) ? ? ? moveq #imm,dx ? ? ? ? ? ? ? 1(0/0) msac.w ry,rx,ea,rw ? 3(1/0) 3(1/0) 3(1/0) 3(1/0) ? ? ? msac.l ry,rx,ea,rw ? 5(1/0) 5(1/0) 5(1/0) 5(1/0) ? ? ? muls.w ,dx 4(0/0) 6(1/0) 6(1/0) 6 (1/0) 6(1/0) 7(1/0) 6(1/0) 4(0/0) mulu.w ,dx 4(0/0) 6(1/0) 6(1/0) 6 (1/0) 6(1/0) 8(1/0) 6(1/0) 4(0/0) muls.l ,dx 6(0/0) 8(1/0) 8(1/0) 8(1/0) 8(1/0) ? ? ? mulu.l ,dx 6(0/0) 8(1/0) 8(1/0) 8(1/0) 8(1/0) ? ? ? or.l ,rx 1(0/0) 3(1/0) 3(1/0) 3 (1/0) 3(1/0) 4(1/0) 3(1/0) 1(0/0) or.l dy, ? 3(1/1) 3(1/1) 3(1/1) 3(1/1) 4(1/1) 3(1/1) ? or.l #imm,dx 1(0/0) ? ? ? ? ? ? ? rems.l ,dx 35(0/0) 38(1/0) 38(1/0) 38(1/0) 38(1/0) ? ? ? remu.l ,dx 35(0/0) 38(1/0) 38(1/0) 38(1/0) 38(1/0) ? ? ? sub.l ,rx 1(0/0) 3(1/0) 3(1/0) 3 (1/0) 3(1/0) 4(1/0) 3(1/0) 1(0/0) table 2-14. two-operand instruction execution times (continued) opcode effective address rn (an) (an)+ ?(an) (d16,an) (d8,an,xi*sf) (xxx).wl #
coldfire core MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 2-24 freescale semiconductor 2.7.4 miscellaneous instruction execution times table 2-15 lists timings for miscellaneous instructions. sub.l dy, ? 3(1/1) 3(1/1) 3(1/1) 3(1/1) 4(1/1) 3(1/1) ? subi.l #imm,dx 1(0/0) ? ? ? ? ? ? ? subq.l #imm, 1(0/0) 3(1/1) 3(1/ 1) 3(1/1) 3(1/1) 4(1/1) 3(1/1) ? subx.l dy,dx 1(0/0) ? ? ? ? ? ? ? table 2-15. miscellaneous instruction execution times opcode effective address rn (an) (an)+ ?(an) (d16,an) (d8,an,xi*sf) (xxx).wl # cpushl (ax) ? 11(0/1) ? ? ? ? ? ? link.w ay,#imm 2(0/1) ? ? ? ? ? ? ? move.w ccr,dx 1(0/0) ? ? ? ? ? ? ? move.w ,ccr 1(0/0) ? ? ? ? ? ? 1(0/0) move.w sr,dx 1(0/0) ? ? ? ? ? ? ? move.w ,sr 7(0/0) ? ? ? ? ? ? 7(0/0) movec ry,rc 9(0/1) ? ? ? ? ? ? ? movem.l 1 1 n is the number of registers moved by the movem opcode. ,&list ? 1+n(n/0) ? ? 1+n(n/0) ? ? ? movem.l &list, ? 1+n(0/n) ? ? 1+n(0/n) ? ? ? nop 3(0/0) ? ? ? ? ? ? ? pea ? 2(0/1) ? ? 2(0/1) 2 2 pea execution times are the same for (d16,pc). 3(0/1) 3 3 pea execution times are the same for (d8,pc,xi*sf). 2(0/1) ? pulse 1(0/0) ? ? ? ? ? ? ? stop #imm ? ? ? ? ? ? ? 3(0/0) 4 4 the execution time for stop is the time required until t he processor begins sampling continuously for interrupts. trap #imm ? ? ? ? ? ? ? 15(1/2) trapf 1(0/0) ? ? ? ? ? ? ? trapf.w 1(0/0) ? ? ? ? ? ? ? trapf.l 1(0/0) ? ? ? ? ? ? ? unlk ax 2(1/0) ? ? ? ? ? ? ? wddata.l ? 3(1/0) 3(1/0) 3( 1/0) 3(1/0) 4(1/0) 3(1/0) ? wdebug.l ? 5(2/0) ? ? 5(2/0) ? ? ? table 2-14. two-operand instruction execution times (continued) opcode effective address rn (an) (an)+ ?(an) (d16,an) (d8,an,xi*sf) (xxx).wl #
coldfire core MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 2-25 2.7.5 branch instruction execution times table 2-16 shows general branch instruction timing. table 2-17 shows timing for bcc instructions. 2.8 exception processing overview exception processing for coldfire pr ocessors is streamlined for perfor mance. differences from previous m68000 family processors include the following: ? a simplified exception vector table ? reduced relocation capabilities us ing the vector base register ? a single exception stack frame format ? use of a single, self-a ligning system stack pointer coldfire processors use an instruction restart ex ception model but require more software support to recover from certain access errors. see table 2-18 for details. exception processing can be defined as the time from the detection of the fault condition until the fetch of the first handler instruction has b een initiated. it is comprised of the following four major steps: 1. the processor makes an internal copy of the sr and then enters supervisor mode by setting sr[s] and disabling trace mode by clearing sr[t]. the oc currence of an interrupt exception also forces sr[m] to be cleared and the interrupt priority mask to be set to the level of the current interrupt request. 2. the processor determines the exception vector number. for all faults except interrupts, the processor performs this calculation based on th e exception type. for interrupts, the processor performs an interrupt-acknowl edge (iack) bus cycle to obtain the vector number from a peripheral device. the iack cycle is mapped to a special acknowledge a ddress space with the interrupt level encoded in the address. table 2-16. general branch instruction execution times opcode effective address rn (an) (an)+ ?(an) (d16,an) (d8 ,an,xi*sf) (xxx).wl # bra ? ? ? ? 2(0/1) ? ? ? bsr ? ? ? ? 3(0/1) ? ? ? jmp ? 3(0/0) ? ? 3(0/0) 4(0/0) 3(0/0) ? jsr ? 3(0/1) ? ? 3(0/1) 4(0/1) 3(0/1) ? rte ? ? 10(2/0) ? ? ? ? ? rts ? ? 5(1/0) ? ? ? ? ? table 2-17. bcc instruction execution times opcode forward taken forward not taken backward taken backward not taken bcc 3(0/0) 1(0/0) 2(0/0) 3(0/0)
coldfire core MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 2-26 freescale semiconductor 3. the processor saves the current context by creating an exception stack frame on the system stack. coldfire processors support a singl e stack pointer in the a7 address register; therefore, there is no notion of separate supervisor an d user stack pointers. as a resu lt, the exception stack frame is created at a 0-modulo-4 address on the top of the current system stack. additionally, the processor uses a simplified fixed-length stack frame for all exceptions. the exception type determines whether the program counter in the exception st ack frame defines the address of the faulting instruction (fault) or of the next instruction to be executed (next). 4. the processor acquires the addres s of the first instruction of th e exception handler. the exception vector table is aligned on a 1-mbyte boundary. th is instruction address is obtained by fetching a value from the table at the addre ss defined in the vector base regi ster. the index into the exception table is calculated as 4 x vector_number. when the index value is gene rated, the vector table contents determine the address of the first instruct ion of the desired handler. after the fetch of the first opcode of the handler is initiated, except ion processing terminates and normal instruction processing continue s in the handler. coldfire processors support a 1024-byte vector table aligned on any 1-mbyte address boundary; see table 2-18 . the table contains 256 excepti on vectors where the first 64 ar e defined by freescale; the remaining 192 are user-def ined interrupt vectors. table 2-18. exception vector assignments vector numbers vector offset (hex) stacked program counter 1 assignment 0 000 ? initial stack pointer 1 004 ? initial program counter 2 008 fault access error 3 00c fault address error 4 010 fault illegal instruction 5 014 fault divide by zero 6?7 018?01c ? reserved 8 020 fault privilege violation 9 024 next trace 10 028 fault unimplemented line-a opcode 11 02c fault unimplemented line-f opcode 12 030 next debug interrupt 13 034 ? reserved 14 038 fault format error 15 03c next uninitialized interrupt 16?23 040?05c ? reserved 24 060 next spurious interrupt 25?31 064?07c next level 1?7 autovectored interrupts 32?47 080?0bc next trap #0?15 instructions 48?60 0c0?0f0 ? reserved
coldfire core MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 2-27 coldfire processors inhibit samplin g for interrupts during the first inst ruction of all exception handlers. this allows any handler to effectively disable interr upts, if necessary, by raising the interrupt mask level contained in the status register. 2.8.1 exception stack frame definition the exception stack frame is shown in figure 2-10 . the first longword of th e exception stack frame contains the 16-bit format/vector wo rd (f/v) and the 16-bit status regi ster. the second longword contains the 32-bit program counter address. the 16-bit format/vector word contains three unique fields: ? format field?this 4-bit field at the top of the system stack is always written with a value of {4,5,6,7} by the processor indicating a 2-longword frame format. see table 2-19 . this field records any longword misalignment of the stack pointer that may have existed when the exception occurred. ? fault status field?the 4-bit fiel d, fs[3?0], at the top of the system stack is defined for access and address errors along with interr upted debug service routines. see table 2-20 . 61 0f4 fault unsupported instruction 62?63 0f8?0fc ? reserved 64?255 100?3fc next user-defined interrupts 1 the term ?fault? refers to the pc of the instruction that caused the exception. the term ?next? refers to the pc of the instruction that immediately foll ows the instruction that caused the fault. 31 28 27 26 25 18 17 16 15 0 a7 format fs[3?2] vector[7?0] fs[1?0] status register + 0x04 program counter [31?0] figure 2-10. exception stack frame form table 2-19. format field encoding original a7 at time of exception, bits 1?0 a7 at first instruction of handler format field bits 31?28 00 original a[7?8] 0100 01 original a[7?9] 0101 10 original a[7?10] 0110 11 original a[7?11] 0111 table 2-18. exception vector assignments (continued) vector numbers vector offset (hex) stacked program counter 1 assignment
coldfire core MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 2-28 freescale semiconductor ? vector number?this 8-bit field, vector[7?0], de fines the exception type. it is calculated by the processor for internal faults and is s upplied by the peripheral for interrupts. see table 2-18 . 2.8.2 processor exceptions table 2-21 describes MCF5272 exceptions. table 2-20. fault status encodings fs[3?0] definition 0000-001x reserved 0100 error on instruction fetch 0101?011x reserved 1000 error on operand write 1001 attempted write to write-protected space 101x reserved 1100 error on operand read 1101?111x reserved table 2-21. MCF5272 exceptions exception description access error caused by an error when accessing memory. for an access error on an instruction fetch, the processor postpones the error reporting until the in struction at the faulted reference is executed. thus, faults that occur during instruction prefetches that are followed by a c hange of instruction flow do not generate an exception. when the processor attempts to execute an instruction with a faulted opword or extension word, the access error is signaled, and the instruction is aborted. for this type of exception, the programming model is not altered by the faulted instruction. if an access error occurs on an operand read, the pr ocessor immediately aborts the current instruction execution and initiates exception processing. in this case, any address register changes caused by the auto-addressing modes, (an)+ and -(an), have already occurred. in addition, if an access error occurs during the execution of a movem instruction loading from memo ry, registers updated before the fault occurs contain the memory operand. due to the processor pipeline implem entation, a write cycle may be decou pled from the execution of the instruction causing the write. thus, if an access error occurs on an operand write, the signaling of the error is imprecise. accordingly, the pc contained in the except ion stack frame represents the location in the program when the access error is signaled, not necessarily the in struction causing the fault. all programming model updates associated with the write inst ruction are complete. the nop instru ction can be used to help identify write access errors. a nop is not executed until all previous operations, including any pending writes are complete. thus if any previous write terminates with an access error, it is guaranteed to be reported on the nop. address error caused by an attempted execution transferring cont rol to an odd instruction address (that is, if bit 0 of the tar get address is set), an attempted use of a word-sized index register (xi.w) or a scale factor of 8 on an indexed effective addressing mode, or attempted execution of an instruction with a full-format indexed addressing mode.
coldfire core MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 2-29 illegal instruction on version 2 coldfire implementations, only some illegal opcodes (0x0000 and 0x4afc) are decoded and generate an illegal instruction exception. additionally, attempting to execute an illegal line a or line f opcode generates unique exception types: vectors 10 and 11, respectively. if any other nonsupported opcode is executed, the resulting operation is undefined. coldfire processors do not provide illegal instruction de tection on extension words of any instruction, including movec. attempting to execute an instruction with an illegal extension word causes undefined results. divide by zero attempted division by zero causes an exception (vector 5, offset = 0x014) except when the pc points to the faulting instruction (divu, divs, remu, rems). privilege violation caused by attempted execution of a supervisor mode instruction while in user mode. the coldfire programmer?s reference manual lists supervisor- and user-mode instructions. tr a c e exception coldfire processors provide instruction-by-instruc tion tracing. while the processor is in trace mode (sr[t] = 1), instruction completion signals a trace ex ception. this allows a debugger to monitor program execution. the only exception to this definition is the stop instru ction. if the processor is in trace mode, the instruction before the stop executes and then generates a trace exce ption. in the exception st ack frame, the pc points to the stop opcode. when the trace handler is exited, the stop instruction is ex ecuted, loading the sr with the immediate operand from the instruction. the proce ssor then generates a trace exception. the pc in the exception stack frame points to the instruction af ter stop, and the sr reflects the just-loaded value. if the processor is not in trace mode and executes a st op instruction where the im mediate operand sets the trace bit in the sr, hardware loads the sr and generates a trace exception. the pc in the exception stack frame points to the instruction after stop, and the sr reflects the just-loaded value. because coldfire processors do not support hardware stacking of multiple exceptions, it is the responsibility of the operating system to check for trace mode after processing ot her exception types. as an example, consider a trap instruction executing in trace mode. the processor in itiates the trap exception and passes control to the corresponding handler. if the system requires that a trace exception be processed, the trap exception handler must check for this condition (sr[15] in the exception stack frame asserted) and pass control to the trace handler before returning from the original exception. debug interrupt caused by a hardware breakpoint register trigger. rather than generating an iack cycle, the processor internally calculates the vector number (12). additionally, the m bit and the interrupt priority mask fields of the sr are unaffected by the interrupt. see section 2.2.2.1, ?status register (sr) .? rte and format error exceptions when an rte instruction executes, the processor first exam ines the 4-bit format field to validate the frame type. for a coldfire processor, any attempted execution of an rte where the format is not equal to {4,5,6,7} generates a format error. the exception stack frame for the format error is created without disturbing the original exception frame and the stacked pc points to rte.the selection of the form at value provides limited debug support for porting code from m68000 applications. on m68000 family processors, the sr was at the top of the stack. bit 30 of the longw ord addressed by the system stack point er is typically zero; so, attempting an rte using this old format generates a format error on a coldfire processor. if the format field defines a valid type, the processor does the following: 1 reloads the sr operand. 2 fetches the second longword operand. 3 adjusts the stack pointer by adding the format value to the auto-incremented address after the first longword fetch. 4 transfers control to the instruction address defined by the second longword operand in the stack frame. trap executing trap always forces an exception and is useful for implementing system calls. the trap instruction may be used to change from user to supervisor mode. table 2-21. MCF5272 exceptions (continued) exception description
coldfire core MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 2-30 freescale semiconductor if a coldfire processor encounters a ny type of fault during the exception processing of another fault, the processor immediately halt s execution with the catast rophic fault-on-fault conditi on. a reset is required to force the processor to exit this halted state. interrupt exception interrupt exception processing, with interrupt recogniti on and vector fetching, includes uninitialized and spurious interrupts as well as those where the r equesting device supplies the 8-bit interrupt vector. reset exception asserting the reset input signal (rsti ) causes a reset exception. reset has the highest exception priority; it provides for system initialization and recovery from catastrophic failure. when assertion of rsti is recognized, current processing is aborted and cannot be recovered. the reset exception places t he processor in supervisor mode by setting sr[s] and disables tracing by clearing sr[t]. this exception also clears sr[m] and sets the processor?s interrupt priority mask in the sr to the highest level (level 7). next, the vbr is initialized to 0x0000_0000. configuration registers controlling the operation of all processor-local memories (cache and ram modules on the MCF5272) are invalidated, disabling the memories. note: other implementation-specific supervisor registers are al so affected. refer to each of the modules in this manual for details on these registers. if the processor is not halted and it has ownership of the bus, it initiates the reset exception by performing two longword read bus cycles. the longword at address 0 is loaded into the stack pointer and the longword at address 4 is loaded into the pc. after the initial instru ction is fetched from memory, program execution begins at the address in the pc. if an access error or address error occurs before the first instruction executes, the processor enters the fault-on-fault halted state. table 2-21. MCF5272 exceptions (continued) exception description
MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 3-1 chapter 3 hardware multiply/accumulate (mac) unit this chapter describes the MCF5272 multiply/accumula te (mac) unit, which executes integer multiply, multiply-accumulate, and miscellane ous register instructions. the ma c is integrated into the operand execution pipeline (oep). 3.1 overview the mac unit provides hardware support for a limited set of digital signal pro cessing (dsp) operations used in embedded code, while supporti ng the integer multiply instructions in the coldfire microprocessor family. the mac unit provides signal proces sing capabilities for the MCF5272 in a variety of applications including digital audio and se rvo control. integrated as an executi on unit in the processor?s oep, the mac unit implements a three-stage arithm etic pipeline optimized for 16 x 16 multiplies. both 16- and 32-bit input operands are supported by this de sign in addition to a full set of extensions for signed and unsigned integers plus signed, fixed-poi nt fractional input operands. the mac unit provides functiona lity in three related areas: ? signed and unsigned integer multiplies ? multiply-accumulate operati ons supporting signed, unsigned, a nd signed fractional operands ? miscellaneous register operations each of the three areas of support is addressed in deta il in the succeeding sections. logic that supports this functionality is contained in a mac module, as shown in figure 3-1 . figure 3-1. coldfire mac multiplication and accumulation x +/- operand y operand x shift 0,1,-1 accumulator
hardware multiply/accumulate (mac) unit MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 3-2 freescale semiconductor the mac unit is tightly coupled to the oep and feat ures a three-stage execution pipeline. to minimize silicon costs, the coldfire mac is optimized for 16 x 16 multiply instructions. the oep can issue a 16 x 16 multiply with a 32-bit accumulation and fe tch a 32-bit operand in the same cycle. a 32 x 32 multiply with a 32-bit accumulation takes three cycl es before the next inst ruction can be issued. figure 3-1 shows the basic functionality of the coldfire mac. a full set of inst ructions is provided for signed and unsigned integers plus signed, fixe d-point, fractiona l input operands. the mac unit is an extension of the basic multipli er found on most micropro cessors. it can perform operations native to signal processing algorithms in an acceptable number of cycles, given the application constraints. for example, small dig ital filters can tolerate some variance in the execution time of the algorithm; larger, more complicated algorithms such as orthogonal transforms may have more demanding speed requirements exceeding the sc ope of any processor ar chitecture and requiring a fully developed dsp implementation. the m68000 architecture was not de signed for high-speed signal proc essing, and a large dsp engine would be excessive in an embedded environment. in striking a middle ground between speed, size, and functionality, the coldfire mac unit is optimized for a small set of ope rations that involve multiplication and cumulative additions. specifically, the multipli er array is optimized for single-cycle, 16 x 16 multiplies producing a 32-bit result, with a possible accumulation cycl e following. this is common in a large portion of signal processing a pplications. in addition, the coldfire core architecture has been modified to allow for an operand fetch in parallel with a multiply, increasi ng overall performance for certain dsp operations. 3.1.1 mac programming model figure 3-2 shows the registers in the mac por tion of the user programming model. figure 3-2. mac programming model these registers are described as follows: ? accumulator (acc)?this 32-bit, re ad/write, general-purpose regist er is used to accumulate the results of mac operations. ? mask register (mask)?this 16-bi t general-purpose register provid es an optional address mask for mac instructions that fetch operands from memory. it is useful in the implementation of circular queues in operand memory. ? mac status register (macsr)? this 8-bit register defines c onfiguration of the mac unit and contains indicator flags affected by mac instruct ions. unless noted otherwise, the setting of macsr indicator flags is ba sed on the final result, that is, the result of the final operation involving the product and accumulator. 31 0 macsr mac status register acc mac accumulator mask mac mask register
hardware multiply/accumulate (mac) unit MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 3-3 3.1.2 general operation the mac unit supports the coldfire integer multiply instructions (muls and mulu) and provides additional functionality for multiply -accumulate operations. the added ma c instructions to the coldfire isa provide for the multiplication of two numbers, foll owed by the addition or subtraction of this number to or from the value contained in the accumulator. the produc t may be optionally shif ted left or right one bit before the addition or subtract ion takes place. hardware support for saturation arithmetic may be enabled to minimize software overh ead when dealing with potential overflow conditions using signed or unsigned operands. these mac operations treat the operands as one of the following formats: ? signed integers ? unsigned integers ? signed, fixed-point , fractional numbers to maintain compactness, the mac module is optimized for 16-bit mu ltiplications. two 16-bit operands produce a 32-bit product. longword ope rations are performed by reusing th e 16-bit multiplier array at the expense of a small amount of extr a control logic. again, the product of two 32-bit operands is a 32-bit result. for longword integer operations , only the least significa nt 32 bits of the pr oduct are calculated. for fractional operations, the entire 63-bit product is calcula ted and then either truncat ed or rounded to a 32-bit result using the round-to-nearest (even) method. because the multiplier array is implem ented in a 3-stage pipeline, mac in structions can have an effective issue rate of one clock for word operations, three for longword integer operations, and four for 32-bit fractional operations. arithme tic operations use register-based in put operands, and summed values are stored internally in the accumulator. thus, an additi onal move instruction is neces sary to store data in a general-purpose register. mac instruct ions can choose the upper or lower wo rd of a register as the input, which helps filtering operations in whic h one data register is loaded with input data and another is loaded with coefficient data. two 16-bit mac operations can be performed without fetc hing additional operands between instructions by alternating th e word choice during the calculations. the need to move large amounts of data quickly can limit throughput in dsp engines. however, data can be moved efficiently by using the movem instructi on, which automatically generates line-sized burst references and is ideal for filling registers quickly w ith input data, filter coef ficients, and output data. loading an operand from memory into a register during a mac operation ma kes some dsp operations, especially filtering and co nvolution, more manageable. the macsr has a 4-bit operational mode field and three condition fl ags. the operational mode bits control the overflow/saturation mode, whether opera nds are signed or unsigne d, whether operands are treated as integers or fr actions, and how rounding is performed. nega tive, zero, and overflo w flags are also provided. the three program-visible mac regi sters, a 32-bit accumulator (acc), the mac mask register (mask), and macsr, are described in section 3.1.1, ?mac programming model .?
hardware multiply/accumulate (mac) unit MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 3-4 freescale semiconductor 3.1.3 mac instruction set summary the mac unit supports the integer multiply operations defined by the baseline coldfire architecture and the new multiply-accumulate instructions. table 3-1 summarizes the mac unit instruction set. 3.1.4 data representation the mac unit supports three basic operand types: ? two?s complement signed integer: in this format , an n-bit operand represents a number within the range -2 (n-1) < operand < 2 (n-1) - 1. the binary point is to the ri ght of the least significant bit. ? two?s complement unsigned intege r: in this format, an n-bit op erand represents a number within the range 0 < operand < 2 n - 1. the binary point is to the right of the least significant bit. ? two?s complement, signed fractional: in an n-bit number, the first bit is th e sign bit. the remaining bits signify the first n-1 bits after the binary point . given an n-bit number, a n-1 a n-2 a n-3 ... a 2 a 1 a 0 , its value is given by the following formula: this format can represent numbers in the range ?1 < operand < 1 ? 2 (n-1) . for words and longwords, the greatest negative number that can be represented is ?1, whose internal representation is 0x8000 and 0x0x8000_0000, resp ectively. the most positive word is 0x7fff or (1 - 2 -15 ); the most positive longword is 0x7fff_ffff or (1 - 2 -31 ). 3.2 mac instruction execution timings for information on mac instruct ion execution timings, refer to section 2.7, ?instruction timing .? table 3-1. mac instruction summary instruction mnemonic description multiply signed muls y,dx multiplies two signed operands yielding a signed result multiply unsigned mulu y,dx multiplies two unsigned operands yielding an unsigned result multiply accumulate mac ry,rxsf msac ry,rxsf multiplies two operands, then adds or subtracts the product to/from the accumulator multiply accumulate with load mac ry,rxsf,rw msac ry,rxsf,rw multiplies two operands, then adds or subtracts the product to/from the accumulator while loading a register with the memory operand load accumulator mov.l {ry,#imm},acc loads the accumulator with a 32-bit operand store accumulator mov.l acc,rx writes the c ontents of the accumulator to a register load macsr mov.l {ry,#imm},macsr writes a value to the macsr store macsr mov.l macsr,rx writes t he contents of macsr to a register store macsr to ccr mov.l macsr,ccr writes the cont ents of macsr to the processor?s ccr register load mask mov.l {ry,#imm},mask writes a value to mask store mask mov.l mask,rx writes the contents of mask to a register 2 i1n ? + () ai ? i0 = n2 ? +
MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 4-1 chapter 4 local memory this chapter describes the MCF5272 implementation of the coldfire version 2 core local memory specification. it consists of the following sections. ? section 4.3, ?sram overview ,? and section 4.4, ?rom overview ,? describe the on-chip static ram (sram) and rom implementations. th ese chapters cover general operations, configuration, and initialization. they also provide information and examples showing how to minimize power consumption wh en using the rom and sram. ? section 4.5, ?instruc tion cache overview ,? describes the cache implementation, including organization, configuration, and coherency. it describes cache operations and how the cache interfaces with other memory structures. 4.1 interactions between local memory modules depending on configuration information, instructi on fetches and data read accesses may be sent simultaneously to the sram, rom, and cache contro llers. this approach is required because the controllers are memory-mapped devices and the hit/miss determ ination is made concu rrently with the read data access. power dissipation can be minimized by c onfiguring the rom and sram base address registers (rombar and rambar) to mask unused address spaces whenever possible. if the access address is mapped into the region defined by the sram (and this region is not masked), it provides the data back to the proce ssor and any cache or rom data is discarded. if the access address does not hit the sram, but is mapped into the region defined by the rom (and this region is not masked), the rom provides the data back to the processor and any cache data is discarded. accesses from the sram and rom modules are never cached. the complete defini tion of the processor?s lo cal bus priority scheme for read references is as follows: if (sram ?hits?) sram supplies data to the processor if (rom ?hits?) rom supplies data to the processor else if (cache ?hits?) cache supplies data to the processor else system memory reference to access data
local memory MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 4-2 freescale semiconductor 4.2 local memory registers table 4-1 lists the local memory registers. note the following: ? addresses not assigned to the regi ster and undefined register bits are reserved. write accesses to these bits have no effect; read accesses return zeros. ? the reset value column indicates the register initia l value at reset. uninitial ized fields may contain random values after reset. 4.3 sram overview the sram module has the following features: ? 4-kbyte sram, organized as 1k x 32 bits ? single-cycle access ? physically located on the coldfire core's high-speed local bus ? byte, word, longword address capabilities ? programmable memory mapping 4.3.1 sram operation the sram module provides a general-purpose memory block the coldfire core can access in a single cycle. the location of the memory block can be se t to any 4-kbyte address boundary within the 4-gbyte address space. the memory is ideal for storing critical code or data struct ures or for use as the system stack. because the sram module is physically connected to the processor's high -speed local bus, it can quickly service core-initiated accesses or memory -referencing commands from the debug module. section 4.1, ?interactions between local memory modules ,? describes priorities when an access address hits multiple local memory resources. 4.3.2 sram programming model the MCF5272 implements the sram base address register (rambar), shown in figure 4-1 and described in the following section. table 4-1. memory map of instruction cache registers address (using movec) name width description reset value 0x002 cacr 32 cache control register 0x0000 0x004 acr0 32 access control register 0 0x0000 0x005 acr1 32 access control register 1 0x0000 0xc00 rombar 32 rom base address register uninitialized (except v = 0) 0xc04 rambar 32 sram base address register uninitialized (except v = 0)
local memory MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 4-3 4.3.2.1 sram base address register (rambar) rambar determines the base address location of the internal sram modul e, as well as the definition of the types of accesses allowed for it. ? rambar is a 32-bit write-only supervisor control register. it is accessed in the cpu address space via the movec instruction with an rc encoding of 0xc04. rambar can be read or written in background debug mode (bdm). at system reset, th e v bit is cleared and the remaining bits are uninitialized. to access the sram module, rambar must be writ ten with the appropriate base address after system reset. ? the sram base address register (rambar) can be accessed only in supervisor mode using the movec instruction with an rc value of 0xc04. figure 4-1. sram base address register (rambar) rambar fields are described in table 4-2 . 31 12 11 9 8 7 6 5 4 3 2 1 0 field ba ? wp ? c/i sc sd uc ud v reset ? 0 r/w w for cpu; r/w for debug address cpu space + 0xc04 table 4-2. rambar field description bits name description 31?12 ba base address. sram module base address. the sram module occupies a 4-kbyte space defined by ba. sram can reside on any 4-kbyte boundary in the 4-gbyte address space. 11?9 ? reserved, should be cleared. 8 wp write protect. controls read /write properties of the sram. 0 allows read and write accesses to the sram module. 1 allows only read accesses to the sram module. any attempted write reference generates an access error exception to the coldfire processor core. 7?6 ? reserved, should be cleared. 5?1 c/i, sc, sd, uc, ud address space masks (as n ). these fields allow certain types of accesses to be masked, or inhibited from accessing the sram module. these bits are useful for power management as described in section 4.3.2.3, ?programming rambar for power management .? in particular, c/i is typically set. the address space mask bits are follows: c/i = cpu space/interrupt acknowledge cycle ma sk. note that c/i must be set if ba = 0. sc = supervisor code address space mask sd = supervisor data address space mask uc = user code address space mask ud = user data address space mask for each as n bit: 0 an access to the sram module can occur for this address space 1 disable this address space from the sram module. references to this address space cannot access the sram module and are processed like other non-sram references. 0 v valid. enables/disables the sram module. v is cleared at reset. 0 rambar contents are not valid. 1 rambar contents are valid.
local memory MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 4-4 freescale semiconductor the mapping of a given access into the sram uses the following algorithm to dete rmine if the access hits in the memory: if (rambar[0] = 1) if (requested address[31:12] = rambar[31:12]) if (address space mask of the requested type = 0) access is mapped to the sram module if (access = read) read the sram and return the data if (access = write) if (rambar[8] = 0) write the data into the sram else signal a write-protect access error 4.3.2.2 sram initialization after a hardware reset, the cont ents of the sram module are undefi ned. the valid bit of rambar is cleared, disabling the module. if the sram needs to be initialized with instructions or data, the following steps should be performed: 1. load rambar, mapping the sram module to the desired location. 2. read the source data and write it to the sr am. various instructions support this function, including memory-to-memory move instruct ions and the movem opcode. the movem instruction is optimized to generate line-sized burst fetches on 0-modulo-16 addresses, so this opcode generally provides the best performance. 3. after data is loaded into the sram, it may be appropriate to load a re vised value into rambar with new write-protect and address space mask attributes. these attributes consist of the write-protect and address-space mask fields. the coldfire processor or an external bdm em ulator using the debug module can perform this initialization. 4.3.2.3 programming rambar for power management depending on the configuration defi ned by rambar, instructi on fetch accesses can be sent to the sram module, rom module, and instruction cache simult aneously. if the access is mapped to the sram module, it sources the read data, discarding the instru ction cache access. if the sr am is used only for data operands, setting rambar[sc,uc] lowers power dissipation by disabling the sram during all instruction fetches. additionally, if the sram holds only instruct ions, setting rambar [sd,ud] reduces power dissipation. consider the examples on table 4-3 of typical rambar settings: table 4-3. examples of typical rambar settings data contained in sram rambar[7?0] instructions only 0x2b data only 0x35 both instructions and data 0x21
local memory MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 4-5 rombar can be configured similarly, as described in section 4.4.2.2, ?programming rombar for power management .? 4.4 rom overview the rom modules has the following features: ? 16-kbyte rom, organized as 4k x 32 bits ? contains data tables for soft hdlc (high-level data link control) ? the rom contents are not customizeable ? single-cycle access ? physically located on coldfire core's high-speed local bus ? byte, word, longword address capabilities ? programmable memory mapping 4.4.1 rom operation the rom module contains tabular data that the cold fire core can access in a single cycle. the rom can be located on any 16-kbyte address bound ary in the 4-gbyte address space. section 4.1, ?interactions between local memory modules ,? describes priorities when a fetch address hits multiple local memory resources. 4.4.2 rom programming model the MCF5272 implements the rom base a ddress register (rombar), shown in figure 4-2 and described in the following section. 4.4.2.1 rom base address register (rombar) rombar determines the base addre ss location of the internal rom modul e, as well as the definition of the allowable access types. rombar can be accessed in supervisor mode using the movec instruction with an rc value of 0xc00. it can also be read when the proces sor is in background debug mode (bdm). to access the rom module, rombar should be in itialized with the appr opriate base address. rombar fields are described in table 4-4 . 31 1413 876543210 field ba ? ? c/i sc sd uc ud v reset ? 00 ????? 0 r/w w for cpu; r/w for debug address cpu space + 0xc00 figure 4-2. rom base address register (rombar)
local memory MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 4-6 freescale semiconductor 4.4.2.2 programming rombar for power management depending on the rombar configuration, memory a ccesses can be sent to the rom module and the cache simultaneously. if an access hits both, the rom modul e sources read data a nd the instruction cache access is discarded. because the rom contains onl y for data, setting rombar[sc,uc] lowers power dissipation by disabling the rom during instruction fetches. table 4-5 shows typical rombar settings: rambar can be configured similarly, as described in section 4.3.2.3, ?programming rambar for power management .? table 4-4. rombar field description bits name description 31?14 ba base address. defines the rom module base address. rom can reside on any 16-kbyte boundary in the 4-gbyte address space. 13?6 ? reserved, should be cleared. 5?1 c/i, sc, sd, uc, ud address space masks (as n ). allows specific address spaces to be enabled or disabled, placing internal modules in a specific address space. if an address spac e is disabled, an access to the register in that address space becomes an external bus access, and the module resource is not accessed. these bits are useful for power management as described in section 4.4.2.2, ?program ming rombar for power management .? in particular, c/i is typically set. the address space mask bits are follows: c/i = cpu space/interrupt acknowledge cycle ma sk. note that c/i must be set if ba = 0. sc = supervisor code address space mask sd = supervisor data address space mask uc = user code address space mask ud = user data address space mask for each as n bit: 0 an access to the rom module can occur for this address space 1 disable this address space from the rom module. re ferences to this address space cannot access the rom module and are processed like other non-rom references. 0 v valid. indicates whether rombar contents are va lid. the ba value is not used and the rom module is not accessible until v is set. 0 contents of rombar are not valid. 1 contents of rombar are valid. table 4-5. examples of typical rombar settings data contained in rom rombar[7?0] instructions only 0x2b data only 0x35 both instructions and data 0x21
local memory MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 4-7 4.5 instruction cache overview the features of the instruction cache are as follows: ? 1-kbyte direct-mapped cache ? single-cycle access on cache hits ? physically located on coldfire core's high-speed local bus ? nonblocking design to maximize performance ? 16-byte line-fill buffer ? configurable cache miss-fetch algorithm 4.5.1 instruction cache physical organization the instruction cache, figure 4-3 , is a direct-mapped si ngle-cycle memory, organi zed as 64 lines, each containing 16 bytes. memory consists of a 64-entry tag array (containing addresses and a va lid bit) and a 1-kbyte instruction data array, organized as 64 x 128 bits. the two memory arrays are accessed in parallel: bits 9?4 of the inst ruction fetch addres s provide the index into the tag array; bits 9?2 address the data array. the tag array outputs the address mapped to the given cache location along with the valid bit for the line. th is address field is compared to bits 31?10 of the instruction fetch address from the lo cal bus to determine if a cache hit in the memory array has occurred. if the desired address is mapped into the cache memory , the output of the data array is driven onto the coldfire core's local data bus completing the access in a single cycle. the tag array maintains a single valid bit per line entry. accordingly, onl y entire 16-byte lines are loaded into the instruction cache. the instruction cache also contains a 16-byte fill buffer that provides te mporary storage for the last line fetched in response to a cache miss. with each instru ction fetch, the contents of the line-fill buffer are examined. thus, each instru ction fetch address examines both the ta g memory array and the line-fill buffer to see if the desired address is mapped into either hardware resource. a cache hit in either the memory array or the line-fill buffer is serviced in a single cycl e. because the line-fill buffer maintains valid bits on a longword basis, hits in the buffer can be serviced immediat ely without waiting for th e entire line to be fetched. if the referenced address is not cont ained in the memory array or the li ne-fill buffer, the instruction cache initiates the required external fetch operation. in mo st situations, this is a 16-byte line-sized burst reference. hardware is nonblocking, meaning the co ldfire core's local bus is releas ed after the initial access of a miss. thus, the cache, sram, or ro m module can service subsequent requ ests while the rest of the line is being fetched and loaded into the fill buffer. generally, longword references are used for sequential fetches. if the processor branches to an odd word address, a word-sized fetch is ge nerated. the memory array of the in struction cache is enabled only if cacr[cenb] is asserted.
local memory MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 4-8 freescale semiconductor figure 4-3. instruction cache block diagram 4.5.2 instruction cache operation the instruction cache is physically co nnected to the coldfire core's lo cal bus, allowing it to service all instruction fetches from the coldfire core and cer tain memory fetches init iated by the debug module. typically, the debug module's memory references appear as supervisor data accesses but the unit can be programmed to generate user-mode accesses and/or instruction fetche s. the instruction cache processes any instruction fetch access in the normal manner. 4.5.2.1 interaction with other modules because both the instruction cache and high-speed sram module are conn ected to the coldfire core's local data bus, certain user-defined configurations can result in simultaneous instruction fetch processing. if the referenced address is mapped into the sram module, that module services the request in a single cycle. in this case, data accessed from the instru ction cache is discarded wi thout generating external memory references. if the address is not mapped in to sram space, the instruction cache handles the request in the normal fashion. 4.5.2.2 cache coherency and invalidation the instruction cache does not monitor coldfire core data references for accesses to cached instructions. therefore, software must maintain cache coherency by invalidating the appropriate cache entries after modifying code segments. 31 9 43 0 1 2 31 4 = 31 9 31 0 63 31 0 0 local address bus line buffer address external data[31:0] line buffer data storage mux data fill hit ta g valid local data bus tag hit = mux
local memory MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 4-9 cache invalidation can be perfor med in the two following ways: ? setting cacr[cinva] forces the entire instru ction cache to be marked as invalid. the invalidation operation requires 64 cy cles because the cache sequences through the entire tag array, clearing a single location each cycle. any subsequent instruct ion fetch accesses are postponed until the invalidation sequence is complete. ? the privileged cpushl instruction can invalidate a single cache line. when this instruction is executed, the cache entry defined by bits 9?4 of the source address register is invalidated, provided cacr[cdpi] is cleared. these invalidation operations ca n be initiated from the coldfire core or the debug module. 4.5.2.3 caching modes for every memory reference generated by the processor or debug module, a set of effective attributes is determined based on the address and the acrs. ca ching modes determine how the cache handles an access. an access can be cacheable or cach e-inhibited. for normal accesses, the acr n [cm] bit corresponding to the address of the access specifies th e caching mode. if an address does not match an acr, the default caching mode is defined by cacr [dcm]. the specific al gorithm is as follows: if (address == acr0-address including mask) effective attributes = acr0 attributes else if (address == acr1-address including mask) effective attributes = acr1 attributes else effective attributes = cacr default attributes addresses matching an acr can also be write protected using acr[wp]. reset disables the cache a nd clears all cacr bits. reset does not au tomatically invalidate cache entries; they must be invalidated through software. the acrs allow cacr defaul ts to be overridden. in addition, some instructions (for example, cpushl) and processor core operations perfor m accesses that have an implicit cac hing mode associated with them. the following sections discuss the different cach ing accesses and their associated cache modes. 4.5.2.3.1 cacheable accesses if acr n [cm] or the default field of the cacr indicates the access is cacheabl e, a read access is read from the cache if matching data is found. otherwise, the data is read from memory and the cache is updated. when a line is being read from memory, the longword in the line that contains the core-requested data is loaded first and the requested data is given immediat ely to the processor, wit hout waiting for the three remaining longwords to reach the cache. 4.5.2.3.2 cache-inhibited accesses memory regions can be designated as cache-inhibited, which is useful for memory containing targets such as i/o devices and shared data structures in mu ltiprocessing systems. do not cache memory-mapped registers (for example, regist ers shown with an mbar offset). if the corresponding acr n [cm] or cacr[dcm] indicates cache-i nhibited the access is cache-inhibite d. the caching operation is identical for both cache-inhibited modes, which differ only re garding recovery from an external bus error.
local memory MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 4-10 freescale semiconductor in determining whether a memory location is cacheable or cache-inhi bited, the cpu checks memory-control registers usi ng the following priority: 1. rambar 2. rombar 3. acr0 4. acr1 5. if an access does not hit in rambar, rombar, or the acrs, the default is provided for all accesses in cacr. cache-inhibited write accesses bypa ss the cache and a corresponding external write is performed. cache-inhibited reads bypass the cach e and are performed on the external bus, except when all of the following conditions are true: ? the cache-inhibited fill-buf fer bit, cacr[ceib], is set. ? the access is an instruction read. ? the access is normal (that is, tt = 0). in this case, a fetched line is stored in the fill buffer and remains valid th ere; the cache can service additional read accesses from this buff er until another fill occurs or a cache-invalidate-all operation occurs. if acr n [cm] indicates cache-inhibited, the controller bypasses the cache and performs an external transfer. to ensure the consistenc y of cached data, execute a cpushl instruction or set cacr[cinva] to invalidate the entire cache before switching cache modes. cpu space-register accesses, such as mo vec, are treated as cache-inhibited. 4.5.2.4 reset a hardware reset clears the cacr disabling the instruction cache. note tag array contents are not affected by reset. accordingly, system startup code must explicitly invalidate th e cache by setting cacr[cinva] before the cache can be enabled. 4.5.2.5 cache miss fetch algorithm/line fills as discussed in section 4.5.1, ?instruction cach e physical organization ,? the instruction cache hardware includes a 16-byte line-fill buffer for providing temporary storage fo r the last fetched instruction. with the cache enabled as define d by cacr[cenb], a cacheable instruct ion fetch that misses in both the tag memory and the line-fill buffer generates an external fetch. the si ze of the external fe tch is determined by the value contained in cacr[ clnf] and the miss address. table 4-8 shows the relationships between the clnf bits, the miss address, a nd the size of the external fetch. depending on the run-time character istics of the application and th e memory response speed, overall performance may be increased by pr ogramming clnf to values {00, 01}.
local memory MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 4-11 for all cases of a line-sized fetc h, the critical longword defined by mi ss address bits 3?2 is accessed first followed by the remaining three longwords that are accessed by incrementing the longword address in 0-modulo-16 increments, as shown below: if miss address[3:2] = 00 fetch sequence = {0x0, 0x4, 0x8, 0xc} if miss address[3:2] = 01 fetch sequence = {0x4, 0x8, 0xc, 0x0} if miss address[3:2] = 10 fetch sequence = {0x8, 0xc, 0x0, 0x4} if miss address[3:2] = 11 fetch sequence = {0xc, 0x0, 0x4, 0x0x8} when an external fetch is initiated and data is lo aded into the line-fill bu ffer, the instruction cache maintains a special most-recently-used indicator that tracks the conten ts of the fill buffer versus its corresponding cache location. at the time of the miss, the hardware indi cator is set, marking the fill buffer as most recently used. if a subse quent access occurs to the cache locatio n defined by bits 9?4 of the fill buffer address, the data in the cache memory array is now most-recently used, so the hardware indicator is cleared. in all cases, the indicato r defines whether the contents of the line-fill buffer or the cache memory data array are most recently us ed. if the entire line is present at the time of the next cache miss, the line-fill buffer contents are written into the ca che memory array and the fill buffer data is still most recently used compared to the cache memory array. the fill buffer can also be used as temporary stor age for line-sized bursts of non-cacheable references under control of cacr[ceib]. with th is bit set, a noncacheable instruct ion fetch is processed as defined by table 4-6 . for this condition, the fill buffer is loaded a nd subsequent references can hit in the buffer, but the data is never loaded into the cache memory array. table 4-6 shows the relationship between cenb, ce ib, and the type of instruction fetch. table 4-6. instruction cache operation as defined by cacr[cenb,ceib] cacr[cenb,ceib] type of fetch description 00 n/a instruction cache and line-fill buffer are disabled; fetches are word or longword in size. 01 n/a instruction cache is disabled but becaus e the line-fill buffer is enabled, cacr[clnf] defines fetch size and instructions can be bursted into the line-fill buffer. 1x cacheable cache is enabled; cacr[clnf] defines fe tch size and line-fill buffer contents can be written into the cache memory array. 10 noncacheable cache is enabled but the linefill bu ffer is disabled; fetches are either word or longword and are not loaded into the line-fill buffer. 11 noncacheable cache and line buffer are enabled; cacr[clnf] defines fetch size; fetches are loaded into the line-fill buffer but never into the cache memory array.
local memory MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 4-12 freescale semiconductor 4.5.3 instruction cache programming model three supervisor registers define the operation of the instruction cache and local bus controller: the cache control register (cacr) and two acce ss control registers (acr0, acr1). table 4-7 shows the memory map of the cacr and acrs. these regist ers have the following characteristics: ? the cacr and acrs can be acce ssed only in supervisor mode us ing the movec instruction with an rc value of 0x002 (cacr) , 0x004 (acr0), and 0x005 (acr1). ? addresses not assigned to the re gisters and undefined register bi ts are reserved for future expansion. write accesses to these reserved addres s spaces and reserved register bits have no effect; read accesses return zeros. ? the reset value column indicates the initial value of the register at reset. uninitialized fields may contain random values after reset. ? the access column indicates whether the corr esponding register can be read, written or both. attempts to read a write-only regi ster cause zeros to be returned. attempts to write to a read-only register are ignored. 4.5.3.1 cache control register (cacr) the cacr controls operation of the instruction cache. it provides a set of default memory access attributes for when a reference address does not map into sp aces defined by the acrs. the supervisor-level cacr is accessed in the cpu address space using the mo vec instruction with an rc encoding of 0x002. the cacr can be read or written when the pr ocessor is in backgr ound debug mode (bdm). table 4-7. memory map of instruction cache registers address (using movec) name width description reset value 0x002 cacr 32 cache control register 0x0000 0x004 acr0 32 access control register 0 0x0000 0x005 acr1 32 access control register 1 0x0000 31 30 29 28 27 26 25 24 23 16 field cenb ? cdpi cfrz ? cinva ? reset 0000_0000_0000_0000 r/w write (r/w by debug module) 15 109 8 7654 210 field ? ceib dcm dbwe ? dwp ? clnf reset 0000_0000_0000_0000 r/w write (r/w by debug module) rc 0x002 figure 4-4. cache control register (cacr)
local memory MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 4-13 table 4-8 describes cacr fields. table 4-8. cacr field descriptions bits name description 31 cenb enable cache. 0 cache disabled. the cache is not operational, but data and tags are preserved. 1 cache enabled. 30?29 ? reserved, should be cleared. 28 cdpi disable cpushl invalidation. 0 cache disabled 1 cache enabled 27 cfrz cache freeze. allows the user to freeze the cont ents of the cache. when cfrz is asserted line fetches can be initiated and loaded into the line-fill buffer, but a valid cache entry can not be overwritten. if a given cache location is invalid, the conten ts of the line-fill buffer can be writt en into the memory array while cfrz is asserted. 0 normal operation 1 freeze valid cache lines 26?25 ? reserved, should be cleared. 24 cinva cache invalidate all. writing a 1 to this bit initia tes entire cache invalidation. note the caches are not cleared on power-up or normal reset. 0 no invalidation is performed. 1 initiate invalidation of the entire cache. the ca che controller sequentially clears v in all sets. subsequent accesses stall until invalidation finishes, at which point, cinva is automatically cleared. this operation takes 64 clock cycles. 23?11 ? reserved, should be cleared. 10 ceib default noncacheable fill buffer. determines if the fill buffer can store noncacheable accesses 0 fill buffer not used to store noncacheab le instruction accesses (16 or 32 bits). 1 fill buffer used to store noncacheable accesses. the fill buffer is used only for normal (tt = 0) instruction reads of a noncacheable region. instructio ns are loaded into the fill buffer by a burst access (same as a line fill). they stay in the buffer until they are displaced, so subsequent accesses may not appear on the external bus. note that this feature can cause a coherency problem for self-modifying code. if ceib = 1 and a cache-inhibited access uses the fill buffer, instru ctions remain valid in the fill buffer until a cache-invalidate-all instruction, another cache-i nhibited burst, or a miss that initiates a fill. 9 dcm default cache mode. see section 4.5.2.3, ?caching modes .? 0 default cacheable 1 default noncacheable 8 dbwe default buffered write enable. defines the default value for enabling buffered writes. generally, enabled buffered writes provide higher system performance but recovery from access errors can be more difficult. for the coldfire cpu, reporting access errors on operand writes is always imprecise and enabling buffered writes simply further decouples the write instruction from the signaling of the fault 0 termination of an operand write cycle on the processor's local bus is delayed until the external bus cycle completes. 1 a local bus write cycle is terminated immediately and the operation buffered in the bus controller. operand write cycles are effectively decoupled betwee n the processor's local bus and the external bus. 7?6 ? reserved, should be cleared. 5 dwp default write protect. 0 read and write accesses permitted 1 write accesses not permitted 4?2 ? reserved, should be cleared.
local memory MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 4-14 freescale semiconductor 4.5.3.2 access control registers (acr0 and acr1) the acrs define memory reference attributes for two memory regions (one per acr). these attributes affect every memory reference using the acrs or th e set of default attributes contained in the cacr. acrs are examined for each memory referen ce not mapped to the sram or rom module. the supervisor-level acrs are accessed in the cpu addr ess space using the movec instruction with an rc encoding of 0x004 and 0x005. acrs can be read and written in bdm mode. table 4-9 describes acr n fields. i 1?0 clnf control longword fetch. controls the size of the me mory request the cache issues to the bus controller for different initial line access offsets. clnf longword address bits 00 01 10 11 00 line line line longword 01 line line longword longword 1x line line line line 31 24 23 16 15 14 13 12 7 6 5 4 3 2 1 0 field ba bam en sm ? cm bwe ? wp ? reset 0000_0000_0000_0000 r/w write (r/w by debug module) rc acr0: 0x004; acr1: 0x005 figure 4-5. access control register format (acr n ) table 4-9. acr n field descriptions bits name description 31?24 ba base address. compared with a[31:24]. eligible addresses that match are a ssigned the access control attributes of this register. 23?16 bam base address mask. setting a bam bit masks the co rresponding ba bit. settin g low-order bam bits can define contiguous regions exceeding 16 mbytes. bam can define multiple noncontiguous regions. 15 en enable. enables or disables the other acr n bits. 0 access control attributes disabled 1 access control attributes enabled 14?13 sm supervisor mode. specifies whether only user or su pervisor accesses are allowed in this address range or if the type of access is a don?t care. 00 match addresses only in user mode 01 match addresses only in supervisor mode 1x execute cache matching on all accesses 12?7 ? reserved; should be cleared. table 4-8. cacr field descriptions (continued) bits name description
local memory MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 4-15 6 cm cache mode. defines whether the memory access is cacheable or noncacheable. 0 caching enabled 1 caching disabled 5 bwe buffered write enable. generally, the enablin g of buffered writes provides higher system performance but recovery from access errors may be more difficult. fo r the coldfire cpu, reporti ng access errors on operand writes is always imprecise; enabling buffered writes furt her decouples the write inst ruction from the signaling of the fault. 0 termination of an operand write cycle on the proce ssor's local bus is delayed until the external bus cycle is completed. 1 a write cycle on the local bus is terminated immediat ely and the operation is then buffered in the bus controller. in this mode, operand write cycles are effectively decoupled between the processor's local bus and the external bus. 4?3 ? reserved, should be cleared. 2 wp write protect. selects the write privilege of the memory region. 0 read and write accesses permitted 1 write accesses not permitted 1?0 ? reserved, should be cleared. table 4-9. acr n field descriptions (continued) bits name description
local memory MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 4-16 freescale semiconductor
MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 5-1 chapter 5 debug support this chapter describes the revision a enha nced hardware debug support in the MCF5272. 5.1 overview the debug module is shown in figure 5-1 . figure 5-1. processor/debug module interface debug support is divided into three areas: ? real-time trace support?the ability to dete rmine the dynamic execution path through an application is fundamental for debugging. the coldfire solution im plements an 8-bit parallel output bus that reports processor execution status and data to an external emulator system. see section 5.3, ?real-time trace support .? ? background debug mode (bdm)?provides low-le vel debugging in the coldfire processor complex. in bdm, the processor complex is halted and a variety of commands can be sent to the processor to access memory and registers. the external emulator uses a three-pin, serial, full-duplex channel. see section 5.5, ?background debug mode (bdm) ,? and section 5.4, ?programming model .? ? real-time debug support?bdm requi res the processor to be ha lted, which many real-time embedded applications cannot do. debug interrupts let real-time sy stems execute a unique service routine that can quickly save the contents of key registers and variables a nd return the system to normal operation. external development systems can access saved data because the hardware supports concurrent operati on of the processor and bd m-initiated commands. see section 5.6, ?real-time debug support .? coldfire cpu core debug module high-speed communication port dsclk, dsi, dso control bkpt local bus trace port
debug support MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 5-2 freescale semiconductor 5.2 signal description table 5-1 describes debug module signals. al l coldfire debug signals are uni directional and related to a rising edge of the processor core ?s clock signal. the standard 26- pin debug connector is shown in section 5.8, ?freescale-re commended bdm pinout .? figure 5-2 shows pstclk timing with respect to pst and ddata. figure 5-2. pstclk timing table 5-1. debug module signals signal description development serial clock (dsclk) internally synchronized input. (the logic level on dsclk is validated if it has the same value on two consecutive rising clkin edges.) clocks the serial communication port to the debug module during packet transfers. maximum frequency is 1/5 the pr ocessor status clock ( pstclk) speed. at the synchronized rising edge of dsclk, the data input on dsi is sampled and dso changes state. development serial input (dsi) internally synchronized input that provides data input for the serial communication port to the debug module. development serial output (dso) provides serial output communication for debug module responses. dso is registered internally. breakpoint (bkpt ) input used to request a manual breakpoint. assertion of bkpt puts the processor into a halted state after the current instruction completes. halt status is reflected on processor status signals (pst[3:0]) as the value 0xf. processor status clock (pstclk) delayed version of the processor clock. its rising edge appears in the center of valid pst and ddata output. see figure 5-2 . pstclk indicates when the develo pment system should sample pst and ddata values. debug data (ddata[3:0]) these output signals display the regi ster breakpoint status as a def ault, or optionally, captured address and operand values. the capturing of data values is controlled by the setting of the csr. additionally, execution of the wddata instruction by the pr ocessor captures operands which are displayed on ddata. these signals are updated each processor cycle. processor status (pst[3:0]) these output signals report the processor status. ta b l e 5 - 2 shows the encoding of these signals. these outputs indicate the current status of the processor pipeline and, as a result, are not related to the current bus transfer. the pst value is updated each processor cycle. pstclk pst or ddata
debug support MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 5-3 5.3 real-time trace support real-time trace, which defines the dynamic execution pa th, is a fundamental de bug function. the coldfire solution is to include a parallel ou tput port providing encoded processor status and data to an external development system. this port is partitioned into tw o 4-bit nibbles: one nibble allows the processor to transmit processor status, (pst), and the other allows operand da ta to be disp layed (debug data , ddata). the processor status may not be related to the current bus transfer. external development systems can us e pst outputs with an external im age of the program to completely track the dynamic execution path. th is tracking is complicated by any change in flow, especially when branch target address calculation is based on the contents of a program-vis ible register (variant addressing). ddata outputs can be c onfigured to display the target a ddress of such instructions in sequential nibble increments across multiple processor clock cycles, as described in section 5.3.1, ?begin execution of taken branch (pst = 0x5) .? two 32-bit storage elements fo rm a fifo buffer connecting the processor?s high-speed local bus to the external development system through pst[3:0] and ddata[3:0]. the buffer captures branch target addresses and certa in data values for eventual display on the ddata port, one nibble at a time starting with the least significant bit (lsb). execution speed is affected only when both storage elements contain valid data to be dumped to the ddata port. the core stalls until one fifo entry is available. table 5-2 shows the encoding of these signals. table 5-2. processor status encoding pst[3:0] definition hex binary 0x0 0000 continue execution. many instructions execute in one processor cycle. if an instruction requires more clock cycles, subsequent clock cycles are indicated by driving pst outputs with this encoding. 0x1 0001 begin execution of one instruction. for most instru ctions, this encoding signals the first clock cycle of an instruction?s execution. certain change-of-flow opcodes, plus the pulse and wddata instructions, generate different encodings. 0x2 0010 reserved 0x3 0011 entry into user-mode. signaled after execution of the instruction that caused the coldfire processor to enter user mode. 0x4 0100 begin execution of pulse and wddata instructions . pulse defines logic analyzer triggers for debug and/or performance analysis. wddata lets the core write any operand (byte, word, or longword) directly to the ddata port, independent of debug module configuratio n. when wddata is executed, a value of 0x4 is signaled on the pst port, followed by the appropriate marker, and then the data transfer on the ddata port. transfer length depends on the wddata operand size. 0x5 0101 begin execution of taken branch. for some opcodes, a branch target address may be displayed on ddata depending on the csr settings. csr also controls the nu mber of address bytes displayed, indicated by the pst marker value preceding the ddata nibble that begins the data output. see section 5.3.1, ?begin execution of taken branch (pst = 0x5) .? 0x6 0110 reserved 0x7 0111 begin execution of return from exception (r te) instruction.
debug support MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 5-4 freescale semiconductor 5.3.1 begin execution of taken branch (pst = 0x5) pst is 0x5 when a taken branch is executed. for some opcodes, a branch target address may be displayed on ddata depending on the csr settings. csr also c ontrols the number of address bytes displayed, which is indicated by the pst marker value immediately preceding the dd ata nibble that begins the data output. bytes are displayed in least-to-mos t-significant order. the processor captures only those target addresses associated with taken branches which use a variant addressing mode, that is, rte and rts instructions, jmp and jsr instructions using address register indi rect or indexed addressing modes, and all exception vectors. the simplest example of a branch in struction using a variant address is the compiled code for a c language case statement. typically, the evalua tion of this statement uses the vari able of an expression as an index into a table of offsets, where each offset points to a unique case within the structure. for such change-of-flow operations, the MCF5272 uses the de bug pins to output the following sequence of information on successive processor clock cycles: 1. use pst (0x5) to identify that a taken branch was executed. 2. using the pst pins, opti onally signal the target address to be displayed sequentially on the ddata pins. encodings 0x9?0xb identify the number of bytes displayed . 3. the new target address is optionally available on subsequent cycles using the ddata port. the number of bytes of the target a ddress displayed on this port is configurable (2, 3, or 4 bytes). 0x8? 0xb 1000? 1011 indicates the number of bytes to be displayed on the ddata port on subsequent clock cycles. the value is driven onto the pst port one pstclk cycl e before the data is displayed on ddata. 0x8 begin 1-byte transfer on ddata. 0x9 begin 2-byte transfer on ddata. 0xa begin 3-byte transfer on ddata. 0xb begin 4-byte transfer on ddata. 0xc 1100 exception processing. exceptions that enter emulat ion mode (debug interrupt or optionally trace) generate a different encoding, as described be low. because the 0xc encoding defines a mult iple-cycle mode, pst outputs are driven with 0xc until exception processing completes. 0xd 1101 entry into emulator mode. displayed during emulation mode (debug interrupt or optionally trace). because this encoding defines a multiple-cycle mo de, pst outputs are driven with 0xd until exception processing completes. 0xe 1110 processor is stopped. appears in multiple-cycle fo rmat when the MCF5272 executes a stop instruction. the coldfire processor remains stopped until an interrupt occurs, thus pst outputs display 0xe until the stopped mode is exited . 0xf 1111 processor is halted. because this encoding defines a mu ltiple-cycle mode, the pst outputs display 0xf until the processor is restarted or reset. (see section 5.5.1, ?cpu halt ?) table 5-2. processor status encoding (continued) pst[3:0] definition hex binary
debug support MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 5-5 another example of a varian t branch instruction would be a jmp (a0) instruction. figure 5-3 shows when the pst and ddata outputs that indicate when a jm p (a0) executed, assuming the csr was programmed to display the lower 2 bytes of an address. figure 5-3. example jmp instruction output on pst/ddata pst of 0x5 indicates a taken branch and the marker value 0x9 indicates a 2- byte address. thus, the subsequent 4 nibbles of ddata display the lower 2 bytes of addr ess register a0 in least-to-most-significant nibble orde r. the pst output after the jmp inst ruction completes depends on the target instruction. the pst can continue with the next instruction before the address has completely displayed on ddata because of the dd ata fifo. if the fifo is full and the next instruction has captured values to display on ddata, the pipeline stalls (pst = 0x0) until space is available in the fifo. 5.4 programming model in addition to the existing bdm comm ands that provide access to the pr ocessor?s registers and the memory subsystem, the debug module contains nine registers to support the required functionality. these registers are also accessible from the processor?s supe rvisor programming model by executing the wdebug instruction (write only). thus, the breakpoint hardware in the debug modul e can be read or written by the external development system using the debug serial interface or by the operating system running on the processor core. software is responsib le for guaranteeing that accesses to these resources ar e serialized and logically consistent. hardware provides a locki ng mechanism in the csr to allow the external development system to disable any attempted writes by the processor to the breakpoint registers (setting csr[ipw]). bdm commands must not be issued if the MCF5272 is using the wdebug instruction to access debug module registers or th e resulting behavior is undefined. these registers, shown in figure 5-4 , are treated as 32-bi t quantities, regardless of the number of implemented bits. ddata pstclk 0x0 0x0 a[3:0] 0x5 0x9 default pst a[7:4] a[11:8] a[15:12] default default default
debug support MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 5-6 freescale semiconductor figure 5-4. debug programming model these registers are accessed through the bdm port by new bdm commands, wdmreg and rdmreg , described in section 5.5.3.3, ?command set descriptions .? these commands contain a 5-bit field, drc, that specifies the register, as shown in table 5-3 . note debug control registers can be written by the external development system or the cpu through the wdebug instruction. csr is write-only from the programming model. it can be read or written through the bdm port using the rdmreg and wdmreg commands. table 5-3. bdm/breakpoint registers drc[4?0] register name abbreviation initial state page 0x00 configuration/status r egister csr 0x0000_0000 p. 5-10 0x01?0x05 reserved ? ? ? 0x06 address attribute trigger register aatr 0x0000_0005 p. 5-7 0x07 trigger definition register tdr 0x0000_0000 p. 5-14 0x08 program counter breakpoint register pbr ? p. 5-13 0x09 program counter breakpoint mask register pbmr ? p. 5-13 0x0a?0x0b reserved ? ? ? 0x0c address breakpoint high register abhr ? p. 5-9 0x0d address breakpoint low register ablr ? p. 5-9 0x0e data breakpoint register dbr ? p. 5-12 0x0f data breakpoint mask register dbmr ? p. 5-12 pc breakpoint mask register pc breakpoint register data breakpoint register data breakpoint mask register trigger definition register configuration/status register note: each debug register is accessed as a 32-bit regi ster; shaded fields above are not used (don?t care). all debug control registers are writable from the exte rnal development system or the cpu via the wdebug instruction. csr is write-only from the programming model. it ca n be read or written through the bdm port using the rdmreg and wdmreg commands . address attribute trigger register address low breakpoint register address high breakpoint register 31 15 7 0 31 15 0 31 15 0 31 15 0 31 15 0 31 15 0 aatr ablr abhr csr dbr dbmr pbr pbmr tdr
debug support MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 5-7 5.4.1 revision a shared debug resources in the revision a implementation of the debug module, certain hardware structures are shared between bdm and breakpoint functionality as shown in table 5-4 . thus, loading a register to perform a specific function that shares hardwa re resources is destructive to the shared function. for example, a bdm command to access memory overwrites an address breakpoint in abhr. a bdm write command overwri tes the data breakpoint in dbr. 5.4.2 address attribute trigger register (aatr) the address attribute tr igger register (aatr), figure 5-5 , defines address attribut es and a mask to be matched in the trigger. the register value is compared with address at tribute signals from the processor?s local high-speed bus, as define d by the setting of the trigge r definition register (tdr). table 5-5 describes aatr fields . table 5-4. rev. a shared bdm/breakpoint hardware register bdm function breakpoint function aatr bus attributes for all memory commands attributes for address breakpoint abhr address for all memory commands address for address breakpoint dbr data for all bdm write commands data for data breakpoint 151413121110 8765432 0 field rm szm ttm tmm r sz tt tm reset 0000_0000_0000_0101 r/w write only. aatr is accessible in supervisor mode as debug control register 0x06 using the wdebug instruction and through the bdm port using the wdmreg command. drc[4?0] 0x06 figure 5-5. address attribute trigger register (aatr) table 5-5. aatr field descriptions bits name description 15 rm read/write mask. setting rm masks r in address comparisons. 14?13 szm size mask. setting an szm bit masks the corresponding sz bit in address comparisons. 12?11 ttm transfer type mask. setting a ttm bit masks the corresponding tt bit in address comparisons. 10?8 tmm transfer modifier mask. setting a tmm bit ma sks the corresponding tm bi t in address comparisons. 7 r read/write. r is compared with the r/w signal of the processor?s local bus. 6?5 sz size. compared to the processor?s local bus size signals. 00 longword 01 byte 10 word 11 reserved
debug support MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 5-8 freescale semiconductor 4?3 tt transfer type. compared with the local bus transfer type signals. 00 normal processor access 01 reserved 10 emulator mode access 11 acknowledge/cpu space access these bits also define the tt encoding for bdm memory commands. in this case, the 01 encoding indicates an external or dma access (for backward compatibility). these bits affect the tm bits. 2?0 tm transfer modifier. compared with the local bus trans fer modifier signals, which give supplemental information for each transfer type. tt = 00 (normal mode): 000 explicit cache line push 001 user data access 010 user code access 011 reserved 100 reserved 101 supervisor data access 110 supervisor code access 111 reserved tt = 10 (emulator mode): 0xx?100 reserved 101 emulator mode data access 110 emulator mode code access 111 reserved tt = 11 (acknowledge/cpu space transfers): 000 cpu space access 001?111 interrupt acknowledge levels 1?7 these bits also define the tm encoding for bdm memory commands (for backward compatibility). table 5-5. aatr field descriptions (continued) bits name description
debug support MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 5-9 5.4.3 address breakpoint registers (ablr, abhr) the address breakpoint low and high registers (ablr, abhr), figure 5-6 , define regions in the processor?s data address space that ca n be used as part of the trigger. these register values are compared with the address for each transfer on the processor?s high-speed local bus. the trigger definition register (tdr) identifies the trigge r as one of three cases: 1. identically the value in ablr 2. inside the range bound by ablr and abhr inclusive 3. outside that same range table 5-6 describes ablr fields. table 5-7 describes abhr fields . 31 0 field address reset ? r/w write only. abhr is accessible in supervisor mo de as debug control register 0x0c using the wdebug instruction and via the bdm port using the rdmreg and wdmreg commands. ablr is accessible in supervisor mode as debug co ntrol register 0x0d using the wdebug instruction and via the bdm port using the wdmreg command. drc[4?0] 0x0d (ablr); 0x0c (abhr) figure 5-6. address breakpoint registers (ablr, abhr) table 5-6. ablr fi eld description bits name description 31?0 address low address. holds the 32-bit address mark ing the lower bound of the address breakpoint range. breakpoints for specific addresses are programmed into ablr. table 5-7. abhr field description bits name description 31?0 address high address. holds the 32-bit address mark ing the upper bound of the address breakpoint range.
debug support MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 5-10 freescale semiconductor 5.4.4 configuration/status register (csr) the configuration/status register (csr) defines the debug configurat ion for the processor and memory subsystem and contains status in formation from the breakpoint logi c. csr is write-only from the programming model. it can be read from and writ ten to through the bdm port. csr is accessible in supervisor mode as debug control register 0x00 us ing the wdebug instruction and through the bdm port using the rdmreg and wdmreg commands. table 5-8 describes csr fields. 31 28 27 26 25 24 23 20 19 17 16 field bstat fof trg halt bkpt hrl ? ipw reset 0000 000 0 0000 0000 r/w 1 r rrr r r ? r/w 1514131211109 8 76543 0 field map trc emu ddc uhe btb ? 1 npl ipi ssm ? reset000 00 0 00 0000 0000 r/w r/w r/w r/w r/w r/w r/w r r/w r/w r/w ? drc[4?0] 0x00 1 bit 7 is reserved for freescale use and must be written as a zero. figure 5-7. configuration/ status register (csr) table 5-8. csr field descriptions bit name description 31?28 bstat breakpoint status. provides read-only status information concerning hardware breakpoints. bstat is cleared by a tdr write or by a csr read when either a le vel-2 breakpoint is triggered or a level-1 breakpoint is triggered and the level-2 breakpoint is disabled. 0000 no breakpoints enabled 0001 waiting for level-1 breakpoint 0010 level-1 breakpoint triggered 0101 waiting for level-2 breakpoint 0110 level-2 breakpoint triggered 27 fof fault-on-fault. if fof is set, a catastrophic halt occurred and forced entry into bdm. fof is cleared whenever csr is read. 26 trg hardware breakpoint trigger. if trg is set, a hardware breakpoint halted the processor core and forced entry into bdm. reset, the debug go command, or reading csr clear trg. 25 halt processor halt. if halt is set, the processor execut ed a halt and forced entry into bdm. reset, the debug go command, or reading csr clear halt. 24 bkpt breakpoint assert . if bkpt is set, bkpt was asserted, forcing the processor into bdm. reset, the debug go command, or reading csr clear bkpt. 23?20 hrl hardware revision level. indicates the level of de bug module functionality. an emulator could use this information to identify the level of functionality supported. 0000 initial debug functionality (revision a) (this is the only valid value for the MCF5272) 19?17 ? reserved, should be cleared. 16 ipw inhibit processor writes. setting ipw inhibits proce ssor-initiated writes to the debug module?s programming model registers. ipw can be m odified only by command s from the external development system.
debug support MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 5-11 15 map force processor references in emulator mode. 0 all emulator-mode references are mapped into supervisor code and data spaces. 1 the processor maps all references while in emulator mode to a special address space, tt = 10, tm = 101 or 110. 14 trc force emulation mode on trace exception. if trc = 1, the processor enters emulator mode when a trace exception occurs. if trc=0, the processor enters supervisor mode. 13 emu force emulation mode. if emu = 1, the proc essor begins executing in emulator mode. see section 5.6.1.1, ?emulator mode .? 12?11 ddc debug data control. controls operand data captur e for ddata, which displays the number of bytes defined by the operand reference size before the actual data; byte displays 8 bits, word displays 16 bits, and long displays 32 bits (one nibble at a time across multiple clock cycles). see ta bl e 5 - 2 . 00 no operand data is displayed. 01 capture all write data. 10 capture all read data. 11 capture all read and write data. 10 uhe user halt enable. selects the cpu privilege level required to execute the halt instruction. 0 halt is a supervisor-only instruction. 1 halt is a supervisor/user instruction. 9?8 btb branch target bytes. defines the number of bytes of branch target address ddata displays. 00 0 bytes 01 lower 2 bytes of the target address 10 lower 3 bytes of the target address 11 entire 4-byte target address see section 5.3.1, ?begin execution of taken branch (pst = 0x5) .? 7 ? reserved, should be cleared. 6 npl non- mode. determines whether the core operates in pipelined or mode or not. 0 pipelined mode 1 nonpipelined mode. the processor effectively executes one instruction at a time with no overlap. this adds at least 5 cycles to the execution time of each instruction. given an av erage execution latency of 1.6, throughput in non-pipeline mode would be 6.6, approximately 25% or less of pipelined performance. regardless of the npl state, a triggered pc breakpoint is always reported before the triggering instruction executes. in normal pipeline operation, the occurr ence of an address and/or data breakpoint trigger is imprecise. in non-pipeline mode, triggers are always reported before the next instruction begins execution and trigger reporting can be considered precise. an address or data breakpoint should always occur befor e the next instruction begins execution. therefore the occurrence of the address/dat a breakpoints should be guaranteed. 5 ipi ignore pending interrupts. 1 core ignores any pending interrupt requests signalled while in single-instruction-step mode. 0 core services any pending interrupt requests that were signalled while in single-step mode. 4 ssm single-step mode. setting ssm puts the processor in single-step mode. 0 normal mode. 1 single-step mode. the processor halts after exec ution of each instruction. while halted, any bdm command can be executed. on receipt of the go command, the processor executes the next instruction and halts again. this process continues until ssm is cleared. 3?0 ? reserved, should be cleared. table 5-8. csr field descriptions (continued) bit name description
debug support MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 5-12 freescale semiconductor 5.4.5 data breakpoint/mask registers (dbr, dbmr) the data breakpoint register (dbr), figure 5-8 , specify data patterns used as part of the tr igger into debug mode. dbr bits are masked by setting co rresponding dbmr bits, as defined in tdr. table 5-9 describes dbr fields. table 5-10 describes dbmr fields. the dbr supports both aligned and misaligned references. table 5-11 shows relationships between processor address, access size, and location within the 32-bit data bus. 31 0 field data (dbr); mask (dbmr) reset uninitialized r/w dbr is accessible in supervisor mode as debug contro l register 0x0e, using the wdebug instruction and through the bdm port using the rdmreg and wdmreg commands. dbmr is accessible in supervisor mode as debug control register 0x 0f,using the wdebug instruction and via the bdm port using the wdmreg command. drc[4?0] 0x0e (dbr), 0x0f (dbmr) figure 5-8. data breakpoint/mask registers (dbr and dbmr) table 5-9. dbr field descriptions bits name description 31?0 data data breakpoint value. contains the value to be compared with the data value fr om the processor?s local bus as a breakpoint trigger. table 5-10. dbmr field descriptions bits name description 31?0 mask data breakpoint mask. the 32-bit mask for the data breakpoint trigger. clearing a dbr bit allows the corresponding dbr bit to be compared to the appropriate bit of the processor?s local data bus. setting a dbmr bit causes that bit to be ignored. table 5-11. access size and operand data location a[1:0] access size operand location 00 byte d[31:24] 01 byte d[23:16] 10 byte d[15:8] 11 byte d[7:0] 0x word d[31:16] 1x word d[15:0] xx longword d[31:0]
debug support MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 5-13 5.4.6 program counter breakpoint/mask registers (pbr, pbmr) the pc breakpoint register (pbr) de fines an instruction a ddress for use as part of the trigger. this register?s contents are compared with the processor? s program counter register when tdr is configured appropriately. pbr bits are masked by setting corr esponding pbmr bits. results are compared with the processor?s program counter re gister, as defined in tdr. figure 5-9 shows the pc breakpoint register. table 5-12 describes pbr fields. figure 5-9 shows pbmr. table 5-13 describes pbmr fields. 31 0 field program counter reset ? r/w write. pc breakpoint register is accessible in supe rvisor mode using the wdeb ug instruction and through the bdm port using the rdmreg and wdmreg commands using values shown in section 5.5.3.3, ?command set descriptions .? drc[4?0] 0x08 figure 5-9. program counter breakpoint register (pbr) table 5-12. pbr field descriptions bits name description 31?0 address pc breakpoint address. the 32-bit address to be compared with the pc as a breakpoint trigger. 31 0 field mask reset ? r/w write. pbmr is accessible in supervisor mode as debug control register 0x09 using the wdebug instruction and via the bdm port using the wdmreg command. drc[4?0] 0x09 figure 5-10. program counter breakpoint mask register (pbmr) table 5-13. pbmr field descriptions bits name description 31?0 mask pc breakpoint mask. a zero in a bit position caus es the corresponding pbr bit to be compared to the appropriate pc bit. set pbmr bits cause pbr bits to be ignored.
debug support MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 5-14 freescale semiconductor 5.4.7 trigger definition register (tdr) the tdr, shown in table 5-11 , configures the operation of the hard ware breakpoint logic that corresponds with the abhr/ablr/aatr, pbr/ pbmr, and dbr/dbmr registers within the debug module. the tdr controls the actions ta ken under the define d conditions. breakpoint logic ma y be configured as a one- or two-level trigger. tdr[31?16] define the second-level trigger and bits 15?0 de fine the first-level trigger. note the debug module has no hardware inte rlocks, so to prevent spurious breakpoint triggers while the breakpoint registers are being loaded, disable tdr (by clearing tdr[29,13])b efore defining triggers. a write to tdr clears the csr trigger status bits, csr[bstat]. table 5-14 describes tdr fields. 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 field trc ebl edlw edwl edwu edll edlm edum eduu di eai ear eal epc pci reset 0000_0000_0000_0000 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 field ? ebl edlw edwl edwu edll edlm edum eduu di eai ear eal epc pci reset 0000_0000_0000_0000 r/w write only. accessible in supervisor mode as debug control register 0x07 using the wdebug instruction and through the bdm port using the wdmreg command. drc[4?0] 0x07 figure 5-11. trigger definition register (tdr) table 5-14. tdr field descriptions bits name description 31?30 trc trigger response control. determines how the proc essor responds to a completed trigger condition. the trigger response is always displayed on ddata. 00 display on ddata only 01 processor halt 10 debug interrupt 11 reserved 15?14 ? reserved, should be cleared. 29/13 ebl enable breakpoint. global enable for the breakpoint trigger. setting tdr[ebl] enables a breakpoint trigger. clearing it disables all breakpoints at that level. second-level trigger first-level trigger
debug support MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 5-15 5.5 background debug mode (bdm) the coldfire family implements a low-level system debugger in the microprocessor hardware. communication with the development system is handl ed through a dedicated, hi gh-speed serial command interface. the coldfire architecture implements th e bdm controller in a dedicated hardware module. although some bdm operations, such as cpu register accesses, require the cpu to be halted, other bdm commands, such as memory acc esses, can be executed while the processor is running. 28?22 12?6 ed x setting an ed x bit enables the corresponding data breakpoint condition based on the size and placement on the processor?s local data bus. clearing all ed x bits disables data breakpoints. 28/12 edlw data longword. entire processor?s local data bus. 27/11 edwl lower data word. 26/10 edwu upper data word. 25/9 edll lower lower data byte. low-order byte of the low-order word. 24/8 edlm lower middle data byte. high-order byte of the low-order word. 23/7 edum upper middle data byte. low-order byte of the high-order word. 22/6 eduu upper upper data byte. high-order byte of the high-order word. 21/5 di data breakpoint invert. provides a way to invert th e logical sense of all the dat a breakpoint comparators. this can develop a trigger based on the occurr ence of a data value other than the dbr contents. 20?18/4 ?2 ea x enable address bits. setting an ea bit enables the corresponding address breakpoint. clearing all three bits disables the breakpoint. 20/4 eai enable address breakpoint inverted. break point is based outside the range between ablr and abhr. 19/3 ear enable address breakpoint range. the breakpoin t is based on the inclusive range defined by ablr and abhr. 18/2 eal enable address breakpoint low. the breakpoint is based on the address in the ablr. 17/1 epc enable pc breakpoint. if set, this bit enables the pc breakpoint. 16/0 pci breakpoint invert. if set, this bit allows execution outside a given region as defined by pbr and pbmr to enable a trigger. if cleared, the pc breakpoint is de fined within the region defined by pbr and pbmr. table 5-14. tdr field descriptions (continued) bits name description
debug support MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 5-16 freescale semiconductor 5.5.1 cpu halt although most bdm operations can occur in parallel with cpu operations, unrestricted bdm operation requires the cpu to be halted. the sources that can ca use the cpu to halt are listed below in order of priority: 1. a catastrophic fault-on-fault condition automatically halts the processor. 2. a hardware breakpoint can be configured to generate a pending halt condition similar to the assertion of bkpt . this type of halt is always first made pending in the processor. next, the processor samples for pending halt and interrupt conditions once per instruction. when a pending condition is asserted, the processor halts execution at the next sample point. see section 5.6.1, ?theory of operation .? 3. the execution of a halt instruction immediately suspends execution. attempting to execute halt in user mode while csr[uhe] = 0 gene rates a privilege violation exception. if csr[uhe] = 1, halt can be executed in user m ode. after halt executes , the processor can be restarted by serial shifting a go command into the debug module. execution continues at the instruction after halt. 4. the assertion of the bkpt input is treated as a pseudo-interr upt; that is, the halt condition is postponed until the processor core samples for halts/interrupts. the processor samples for these conditions once during the execution of each instruct ion. if there is a pending halt condition at the sample time, the processor suspends execution and enters the halted state. the assertion of bkpt should be considered in the following two special cases: ? after the system reset signal is negated, the proc essor waits for 16 processor clock cycles before beginning reset exception processing. if the bkpt input is asserted within eight cycles after rsti is negated, the processor enters th e halt state, signaling halt stat us (0xf) on the pst outputs. while the processor is in this state, all resources accessible through the debug m odule can be referenced. this is the only chance to force the proc essor into emulation mode through csr[emu]. after system initialization, th e processor?s response to the go command depends on the set of bdm commands performed while it is halted for a breakpoint. specific ally, if the pc register was loaded, the go command causes the processo r to exit halted state and pa ss control to the instruction address in the pc, bypassing normal reset excepti on processing. if the pc was not loaded, the go command causes the processor to exit halted state and continue reset exception processing. ? the coldfire architecture also handles a special case of bkpt being asserted while the processor is stopped by execution of the st op instruction. for this case, th e processor exits the stopped mode and enters the halted st ate, at which point, all bdm commands may be ex ercised. when restarted, the processor continues by executing the next se quential instruction, that is, the instruction following the stop opcode. csr[27?24] indicates the halt source, showing the highest priority sour ce for multiple halt conditions.
debug support MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 5-17 5.5.2 bdm serial interface when the cpu is halted and pst reflects the halt status, the development system can send unrestricted commands to the debug module. the debug module implements a synchr onous protocol us ing two inputs (dsclk and dsi) and one output (dso), where dso is specified as a dela y relative to the rising edge of the processor clock. see table 5-1 . the development system serves as the serial communication channel master and must generate dsclk. the serial channel operates at a fr equency from dc to 1/5 of the pstc lk frequency. the channel uses full-duplex mode, where data is se nt and received simultaneously by both master and slave devices. the transmission consists of 17-bit packets composed of a status/contro l bit and a 16-bit data word. as shown in figure 5-12 , all state transitions are enabled on a rising edge of the pstclk clock when dsclk is high; that is, dsi is sampled and dso is driven. figure 5-12. bdm seri al interface timing dsclk and dsi are synchronized inputs. dsclk acts as a pseudo clock enable and is sampled on the rising edge of the processo r clk as well as the dsi. dso is de layed from the dsclk-enabled clk rising edge (registered after a bdm state machine state change). all events in the debug module?s serial state machine are based on the processor clock rising edge. dsclk must also be sampled low (on a positive edge of clk) between each bit exch ange. the msb is transferred first. because dso changes state based on an internally-recognized rising edge of dsclk, dsdo cannot be used to indicate the start of a serial transfer. the development system must count clock cy cles in a given transfer. c1?c4 are described as follows: ? c1?first synchronization cycl e for dsi (dsclk is high). ? c2?second synchronization cycl e for dsi (dsclk is high). ? c3?bdm state machine changes state depending upon dsi and whet her the entire input data transfer has been transmitted. ? c4?dso changes to next value. note a not-ready response can be ignored except during a memory-referencing cycle. otherwise, the de bug module can accept a new se rial transfer after 32 processor clock periods. pstclk dsclk next state bdm state machine dso dsi current state current next past current c1 c2 c3 c4
debug support MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 5-18 freescale semiconductor 5.5.2.1 receive packet format the basic receive packet, figure 5-13 , consists of 16 data bits and 1 status bit. table 5-15 describes receive bdm packet fields. 5.5.2.2 transmit packet format the basic transmit packet, figure 5-14 , consists of 16 data bits and 1 control bit. table 5-16 describes transmit bdm packet fields. 16 15 0 s data field [15:0] figure 5-13. receive bdm packet table 5-15. receive bdm packet field description bits name description 16 s status. indicates the status of cpu-generated messages listed below. the not-ready response can be ignored unless a memory-referencing cycle is in progress. othe rwise, the debug module can accept a new serial transfer after 32 processor clock periods. s datamessage 0 xxxxvalid data transfer 0 0xffffstatus ok 1 0x0000not ready with response; come again 1 0x0001error?terminated bus cycle; data invalid 1 0xffffillegal command 15?0 data data. contains the message to be sent from the debug module to the development system. the response message is always a single word, with the data field encoded as shown above. 16 15 0 cd[15:0] figure 5-14. transmit bdm packet table 5-16. transmit bdm packet field description bits name description 16 c control. this bit is reserved. command and data transfe rs initiated by the development system should clear c. 15?0 data contains the da ta to be sent from the developm ent system to the debug module.
debug support MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 5-19 5.5.3 bdm command set table 5-17 summarizes the bdm command set. subsequent paragraphs contain deta iled descriptions of each command. issuing a bdm comm and when the processor is accessi ng debug module registers using the wdebug instruction causes undefined behavior. unassigned command opcodes are reserved by free scale. all unused command formats within any revision level perform a nop and return the illegal command response . table 5-17. bdm command summary command mnemonic description cpu state 1 1 general command effect and/or requirements on cpu operation: - halted. the cpu must be halted to perform this command. - steal. command generates bu s cycles that can be interleaved with bus accesses. - parallel. command is executed in parallel with cpu activity. section command (hex) read a/d register rareg/ rdreg read the selected address or data register and return the results through the serial interface. halted 5.5.3.3.1 0x218 {a/d, reg[2:0]} write a/d register wareg/ wdreg write the data operand to the specified address or data register. halted 5.5.3.3.2 0x208 {a/d, reg[2:0]} read memory location read read the data at the memory location specified by the longword address. steal 5.5.3.3.3 0x1900?byte 0x1940?word 0x1980?lword write memory location write write the operand data to the memory location specified by the longword address. steal 5.5.3.3.4 0x1800?byte 0x1840?word 0x1880?lword dump memory block dump used with read to dump large blocks of memory. an initial read is executed to set up the starting address of the block and to retrieve the first result. a dump command retrieves subsequent operands. steal 5.5.3.3.5 0x1d00?byte 0x1d40?word 0x1d80?lword fill memory block fill used with write to fill large blocks of memory. an initial write is executed to set up the starting address of the block and to supply the first operand. a fill command writes subsequent operands. steal 5.5.3.3.6 0x1c00?byte 0x1c40?word 0x1c80?lword resume execution go the pipeline is flushed and refilled before resuming instruction execution at the current pc. halted 5.5.3.3.7 0x0c00 no operation nop perform no operation; may be used as a null command. parallel 5.5.3.3.8 0x0000 read control register rcreg read the system control re gister. halted 5 .5.3.3.9 0x2980 write control register wcreg write the opera nd data to the system control re gister. halted 5.5.3.3.10 0x2880 read debug module register rdmreg read the debug module register. parallel 5.5.3.3.11 0x2d {0x4 2 drc[4:0]} 2 0x4 is a three-bit field. write debug module register wdmreg write the operand data to the debug module register. parallel 5.5.3.3.12 0x2c {0x4 2 drc[4:0]}
debug support MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 5-20 freescale semiconductor 5.5.3.1 coldfire bdm command format all coldfire family bdm commands include a 16-bit operation word fo llowed by an optional set of one or more extension words, as shown in figure 5-15 . table 5-18 describes bdm fields. 5.5.3.1.1 extension words as required some commands require extension words for addre sses and/or immediate data . addresses require two extension words because only absolute long addre ssing is permitted. longwor d accesses are forcibly longword-aligned and word accesses are forcibly word-aligned. immediat e data can be 1 or 2 words long. byte and word data each re quires a single extension word and longwor d data requires two extension words. operands and addresses are transfer red most-significant word first. in the following descriptions of the bdm command set, the optional set of extension word s is defined as address, data, or operand data. 15 1098765432 0 operation 0 r/w op size 0 0 a/d register extension word(s) figure 5-15. bdm command format table 5-18. bdm field descriptions bit name description 15?10 operation specifies the comm and. these values are listed in ta b l e 5 - 1 7 . 90reserved 8 r/w direction of operand transfer. 0 data is written to the cpu or to memory from the development system. 1 the transfer is from the cpu to the development system. 7?6 operand size operand data size for sized operations. addresses are expressed as 32-bit absolute values. note that a command performing a byte-sized memory read leaves the upper 8 bits of the response data undefined. referenced data is returned in the lower 8 bits of the response. operand sizebit values 00 byte8 bits 01 word16 bits 10 longword32 bits 11 reserved? 5?4 00 reserved 3 a/d address/data. determines whether the register field spec ifies a data or address register. 0 indicates a data register. 1 indicates an address register. 2?0 register contains the register number in co mmands that operate on processor registers.
debug support MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 5-21 5.5.3.2 command sequence diagrams the command sequence diagram in figure 5-16 shows serial bus traffic for commands. each bubble represents a 17-bit bus transfer. the top half of each bubble indicates the data the development system sends to the debug module; the bot tom half indicates the debug module?s response to the previous development system commands. command and resu lt transactions overlap to minimize latency. figure 5-16. command sequence diagram the sequence is as follows: ? in cycle 1, the development system command is issued ( read in this example). the debug module responds with either the low-orde r results of the prev ious command or a comm and complete status of the previous command, if no results are required. ? in cycle 2, the development system supplies the high-order 16 address bits. the debug module returns a not-ready response unless the received command is dec oded as unimplemented, which is indicated by the illegal command encoding. if this occurs, the development system should retransmit the command. note a not-ready response can be ignored except during a memory-referencing cycle. otherwise, the de bug module can accept a new se rial transfer after 32 processor clock periods. commands transmitted to the debug module command code transmitted during this cycle high-order 16 bits of memory address low-order 16 bits of memory address sequence taken if operation has not completed data unused from this transfer sequence taken if illegal command is received by debug module results from previous command responses from the debug module nonserial-related activity ms addr "not ready" xxx "illegal" ls addr "not ready" next cmd "not ready" read (long) ??? next cmd "not ready" xxx "not ready" xxxxx xxx berr ms result next cmd ls result read memory location next command code sequence taken if bus error occurs on memory access high- and low-order 16 bits of result xxx
debug support MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 5-22 freescale semiconductor ? in cycle 3, the development system supplies the low-order 16 address bits. the debug module always returns a not-ready response. ? at the completion of cycle 3, the debug module initiates a memory read operation. any serial transfers that begin during a memory access return a not-ready response. ? results are returned in the two serial transfer cycles after the memory access completes. for any command performing a byte-sized memory read opera tion, the upper 8 bits of the response data are undefined and the referenced data is returned in the lower 8 bits. the ne xt command?s opcode is sent to the debug module during the fi nal transfer. if a memory or regi ster access is terminated with a bus error, the error status (s = 1, data = 0x0001) is returned instead of result data. 5.5.3.3 command set descriptions the following sections describe the commands summarized in table 5-17 . note the bdm status bit (s) is 0 for nor mally completed commands; s = 1 for illegal commands, not-ready responses , and transfers with bus-errors. section 5.5.2, ?bdm serial interface ,? describes the receive packet format. freescale reserves unassigned comm and opcodes for future expansion. unused command formats in any revision level perform a nop and return an illegal command response. 5.5.3.3.1 read a/ d register ( rareg / rdreg ) read the selected address or data re gister and return the 32-bit result. a bus error response is returned if the cpu core is not halted. command/result formats: command sequence: figure 5-18. rareg / rdreg command sequence operand data: none result data: the contents of the selected register are returned as a longword value, most-significant word first. 15 1211 87 432 0 command 0x2 0x1 0x8 a/d register result d[31:16] d[15:0] figure 5-17. rareg / rdreg command format xxx ms result next cmd ls result rareg/rdreg ??? xxx berr next cmd "not ready"
debug support MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 5-23 5.5.3.3.2 write a/d register ( wareg / wdreg ) the operand longword data is written to the specified addr ess or data register. a wr ite alters all 32 register bits. a bus error response is returned if the cpu core is not halted. command format: command sequence figure 5-20. wareg / wdreg command sequence operand data longword data is wri tten into the specified address or data register. the data is supplied most-significant word first. result data command complete status is i ndicated by returning 0xffff (with s cleared) when the register write is complete. 15 12 11 8 7 4 3 2 0 0x2 0x0 0x8 a/d register d[31:16] d[15:0] figure 5-19. wareg / wdreg command format ms data "not ready" xxx ls data "not ready" next cmd "not ready" wdreg/wareg ??? next cmd "cmd complete" berr
debug support MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 5-24 freescale semiconductor 5.5.3.3.3 read me mory location ( read ) read data at the longword addre ss. address space is defined by baar[tt,tm]. hardware forces low-order address bits to zeros for word and longword accesses to ensure that word addresses are word-aligned and longword addr esses are longword-aligned. command/result formats: command sequence: figure 5-22. read command sequence operand data the only operand is the longw ord address of the requested location. result data word results return 16 bits of data; l ongword results return 32. bytes are returned in the lsb of a word result, the upper byte is undefined. 0x0001 (s = 1) is returned if a bus error occurs. 15 12 11 8 7 4 3 0 byte command 0x1 0x9 0x0 0x0 a[31:16] a[15:0] resultxxxxxxxx d[7:0] word command 0x1 0x9 0x4 0x0 a[31:16] a[15:0] result d[15:0] longword command 0x1 0x9 0x8 0x0 a[31:16] a[15:0] result d[31:16] d[15:0] figure 5-21. read command/result formats ms addr "not ready" ls addr "not ready" read (b/w) ??? next cmd "not ready" xxx "not ready" xxx xxx berr result next cmd read memory location ms addr "not ready" ls addr "not ready" read (long) ??? next cmd "not ready" xxx "not ready" xxx xxx berr ms result xxx read memory location next cmd ls result
debug support MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 5-25 5.5.3.3.4 write me mory location ( write ) write data to the memory location specified by th e longword address. the address space is defined by baar[tt,tm]. hardware forces low-order address bits to zeros for word and longword accesses to ensure that word addresses are word-aligned and longword ad dresses are longword-aligned. command formats: 15 12 11 8 7 4 3 1 byte 0x1 0x8 0x0 0x0 a[31:16] a[15:0] xxxxxxxx d[7:0] word 0x1 0x8 0x4 0x0 a[31:16] a[15:0] d[15:0] longword 0x1 0x8 0x8 0x0 a[31:16] a[15:0] d[31:16] d[15:0] figure 5-23. write command format
debug support MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 5-26 freescale semiconductor command sequence: figure 5-24. write command sequence operand data this two-operand instruction require s a longword absolute a ddress that specifies a location to which the data op erand is to be written. byte data is sent as a 16-bit word, justified in the lsb; 16- and 32-bi t operands are sent as 16 and 32 bits, respectively result data command complete status is i ndicated by returning 0xffff (with s cleared) when the register wr ite is complete. a value of 0x0001 (with s set) is returned if a bus error occurs. ms addr "not ready" ls addr "not ready" write (b/w) ??? next cmd "not ready" xxx "not ready" xxx xxx berr "cmd complete" next cmd write memory location data "not ready" ms addr "not ready" ls addr "not ready" write (long) ??? next cmd "not ready" xxx "not ready" xxx xxx berr "cmd complete" next cmd write memory location ms data "not ready" ls data "not ready"
debug support MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 5-27 5.5.3.3.5 dump memory block ( dump ) dump is used with the read command to access large blocks of memory. an initial read is executed to set up the starting address of the block and to retrieve the first result. if an initial read is not executed before the first dump , an illegal command response is returned. the dump command retrieves subsequent operands. the initial addres s is incremented by the operand size ( 1, 2, or 4) and saved in a temporary register. subsequent dump commands use this address, perform the memory read, increment it by the current operand size, and store the update d address in the temporary register. note dump does not check for a valid address; it is a valid command only when preceded by nop , read , or another dump command. otherwise, an illegal command response is returned. nop can be used for intercommand padding without corrupting the address pointer. the size field is examined each time a dump command is processed, allowing the operand size to be dynamically altered. command/result formats: command sequence: figure 5-26. dump command sequence 15 12 11 8 7 4 3 0 byte command 0x1 0xd 0x0 0x0 result xxxxxxxx d[7:0] word command 0x1 0xd 0x4 0x0 result d[15:0] longword command 0x1 0xd 0x8 0x0 result d[31:16] d[15:0] figure 5-25. dump command/result formats xxx "not ready" next cmd result xxx berr xxx "illegal" next cmd "not ready" next cmd "not ready" read memory location dump (b/w) ??? xxx "not ready" next cmd ms result xxx berr xxx "illegal" next cmd "not ready" next cmd "not ready" read memory location dump (long) ??? next cmd ls result
debug support MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 5-28 freescale semiconductor operand data: none result data: requested data is re turned as either a word or longword. byte data is returned in the least-significant byte of a word result. word results return 16 bits of significant data; longword results return 32 bits. a valu e of 0x0001 (with s set) is returned if a bus error occurs. 5.5.3.3.6 fill memory block ( fill ) a fill command is used with the write command to access large bloc ks of memory. an initial write is executed to set up the starting address of th e block and to supply the first operand. the fill command writes subsequent operands. the init ial address is incremented by the op erand size (1, 2, or 4) and saved in a temporary register after the memory write. subsequent fill commands use this address, perform the write, increment it by the current operand size, and store the updated address in the temporary register. if an initial write is not executed preceding the first fill command, the illegal command response is returned. note the fill command does not check for a valid address? fill is a valid command only when preceded by another fill , a nop , or a write command. otherwise, an illegal comma nd response is returned. the nop command can be used for intercommand padding wit hout corrupting the address pointer. the size field is examined each time a fill command is processed, allowing the operand size to be altered dynamically. command formats: 15 12 11 8 7 4 3 0 byte 0x1 0xc 0x0 0x0 xxxxxxxx d[7:0] word 0x1 0xc 0x4 0x0 d[15:0] longword 0x1 0xc 0x8 0x0 d[31:16] d[15:0] figure 5-27. fill command format
debug support MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 5-29 command sequence: figure 5-28. fill command sequence operand data: a single opera nd is data to be writte n to the memory location. byte data is sent as a 16-bit word, justified in the least-si gnificant byte; 16- and 32-bit operands are sent as 16 and 32 bits, respectively. result data: command complete status (0xffff) is returned when the register write is complete. a value of 0x0001 (with s set) is returned if a bus error occurs. 5.5.3.3.7 resume execution ( go ) the pipeline is flushed a nd refilled before normal inst ruction execution resumes. prefetching begins at the current address in the pc and at the current privileg e level. if any register (such as the pc or sr) is altered by a bdm command while the processo r is halted, the u pdated value is used when prefetching resumes. if a go command is issued and the cpu is not halted, the command is ignored. command sequence: figure 5-30. go command sequence operand data: none result data: the command-complete response ( 0xffff) is returned during the next shift operation. 15 12 11 8 7 4 3 0 0x0 0xc 0x0 0x0 figure 5-29. go command format next cmd "not ready" "not ready" xxx berr "cmd complete" data "not ready" xxx next cmd xxx "illegal" next cmd "not ready" fill (long) ??? write memory location next cmd "not ready" xxx "not ready" xxx berr "cmd complete" ms data "not ready" next cmd xxx "illegal" next cmd "not ready" ls data "not ready" write memory location fill (b/w) ??? fill (long) fill (b/w) go ??? next cmd "cmd complete"
debug support MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 5-30 freescale semiconductor 5.5.3.3.8 no operation ( nop ) nop performs no operation and may be us ed as a null command where required. command formats: command sequence: figure 5-32. nop command sequence operand data: none result data: the command-complete response, 0xffff (with s cleared), is returned during the next shift operation. 5.5.3.3.9 read cont rol register ( rcreg ) read the selected control register and return the 32-bit result. accesse s to the processor/memory control registers are always 32 bits wide, regardless of register width. the se cond and third words of the command form a 32-bit address, which the deb ug module uses to generate a special bus cycle to access the specified control register. the 12-bit rc field is the same as that used by the movec instruction. command/result formats: rc encoding: 15 12 11 8 7 4 3 0 0x00x00x00x0 figure 5-31. nop command format 15 12 11 8 7 4 3 0 command 0x2 0x9 0x8 0x0 0x0 0x0 0x0 0x0 0x0 rc result d[31:16] d[15:0] figure 5-33. rcreg command/result formats table 5-19. control register map rc register definition rc register definition 0x002 cache control register (cacr) 0x806 mac accumulator (acc) 0x004 access control register 0 (acr0) 0x80e status register (sr) 0x005 access control register 1 (acr1) 0x80f program register (pc) 0x801 vector base register (vbr) 0xc04 ram base address register (rambar) 0x804 mac status register (macsr) 0xc0f module base address (mbar) 0x805 mac mask register (mask) nop ??? next cmd "cmd complete"
debug support MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 5-31 command sequence: figure 5-34. rcreg command sequence operand data: the only operand is the 32-bi t rc control register select field. result data: control regist er contents are returned as a l ongword, most-significant word first. the implemented portion of registers smaller than 32 bi ts is guaranteed correct; other bits are undefined. 5.5.3.3.10 write control register ( wcreg ) the operand (longword) data is written to the specified c ontrol register. the write al ters all 32 register bits. command/result formats: command sequence: figure 5-36. wcreg command sequence 15 12 11 8 7 4 3 0 command 0x2 0x8 0x8 0x0 0x0 0x0 0x0 0x0 0x0 rc result d[31:16] d[15:0] figure 5-35. wcreg command/result formats ext word "not ready" ext word "not ready" rcreg ??? next cmd "not ready" xxx "not ready" xxx xxx berr ms result read memory location next cmd ls result xxx ms addr control register ms addr ext word "not ready" ext word "not ready" wcreg ??? next cmd "not ready" xxx "not ready" xxx xxx berr "cmd complete" next cmd write memory location ms data "not ready" ls data "not ready" control register write ms addr ms addr
debug support MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 5-32 freescale semiconductor operand data: this instruction re quires two longword operands. the first selects the register to which the operand data is to be wri tten; the second contains the data. result data: successful write operations return 0xffff. bus errors on the write cycle are indicated by the setting of bit 16 in the status message and by a data pattern of 0x0001. 5.5.3.3.11 read debug module register ( rdmreg ) read the selected de bug module register and return the 32-bit result. the only va lid register selection for the rdmreg command is csr (drc = 0x00). note that this read of the csr clears csr[fof, trg, halt, bkpt]; as well as the trigger status bits (csr[bstat]) if either a le vel-2 breakpoint ha s been triggered or a level-1 breakpoint has b een triggered and no level-2 breakpoint has been enabled. command/result formats: table 5-20 shows the definition of drc encoding. command sequence: figure 5-38. rdmreg command sequence operand data: none result data: the contents of th e selected debug register are retu rned as a longword value. the data is returned most-significant word first. 15 12 11 8 7 5 4 0 command 0x2 0xd 100 drc result d[31:16] d[15:0] figure 5-37. rdmreg bdm command/result formats table 5-20. definition of drc encoding?read drc[4:0] debug register defini tion mnemonic initial state page 0x00 configuration/status csr 0x0 p. 5-10 0x01?0x1f reserved ? ? ? xxx ms result xxx "illegal" next cmd ls result next cmd "not ready" rdmreg ???
debug support MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 5-33 5.5.3.3.12 write debug module register ( wdmreg ) the operand (longword) data is written to the sp ecified debug module register. al l 32 bits of the register are altered by the write. dsclk must be inactive wh ile the debug module register writes from the cpu accesses are performed usi ng the wdebug instruction. command format: table 5-3 shows the definition of the drc write encoding. command sequence: figure 5-40. wdmreg command sequence operand data: longword data is written into the specified debug register. the data is supplied most-significant word first. result data: command complete st atus (0xffff) is returned when register write is complete. 5.6 real-time debug support the coldfire family provides s upport debugging real-time applications. for these types of embedded systems, the processor must conti nue to operate during debug. the founda tion of this area of debug support is that while the processor cannot be halted to al low debugging, the system can generally tolerate small intrusions into th e real-time operation. the debug module provides three t ypes of breakpoints?pc with mas k, operand address range, and data with mask. these breakpoints can be configured into one- or two-level triggers with the exact trigger response also programmable. the debug module programming model can be writte n from either the external development system using the debug serial interface or from the processor?s supervisor programming model using the wdeb ug instruction. only csr is readable using the external development system. figure 5-39. wdmreg bdm command format 15 12 11 8 7 5 4 0 0x2 0xc 100 drc d[31:16] d[15:0] ms data "not ready" xxx "illegal" ls data "not ready" next cmd "not ready" wdmreg ??? next cmd "cmd complete"
debug support MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 5-34 freescale semiconductor 5.6.1 theory of operation breakpoint hardware can be configured to respond to triggers in several ways . the response desired is programmed into tdr. as shown in table 5-21 , when a breakpoint is triggered, an indication (csr[bstat]) is provided on the ddata output port when it is not displaying ca ptured processor status, operands, or branch addresses. the breakpoint status is also posted in csr. note th at csr[bstat] is cleared by a csr read when either a level-2 breakpoint is triggered or a level-1 breakpoint is tr iggered and a level-2 brea kpoint is not enabled. status is also cleared by writing to tdr. bdm instructions use the appropriate registers to load and configure breakpoints. as the system operates, a breakpoint trigger generates the response defined in tdr. pc breakpoints are treated in a precise manner?except ion recognition and processi ng are initiated before the excepting instruction is execute d. all other breakpoint events are recognized on the processor?s local bus, but are made pending to the proc essor and sampled like other interr upt conditions. as a result, these interrupts are imprecise. in systems that tolerate the processor being halted, a bdm-entry can be used. with tdr[trc] = 01, a breakpoint trigger causes the core to halt (pst = 0xf). if the processor core cannot be halted, the debug in terrupt can be used. with this configuration, tdr[trc] = 10, the breakpoint trigger becomes a debug interrupt to the pr ocessor, which is treated higher than the nonmaskable level-7 interrupt request. as wi th all interrupts, it is made pending until the processor reaches a sample point, which occurs once pe r instruction. again, the hardware forces the pc breakpoint to occur before the targeted instruction ex ecutes. this is possible because the pc breakpoint is enabled when interrupt sampling occurs. for addre ss and data breakpoints, reporting is considered imprecise because several instructi ons may execute after the triggeri ng address or data is detected. as soon as the debug interrupt is recognized, the processor aborts execution and initiates exception processing. this event is signaled externally by th e assertion of a unique pst value (pst = 0xd) for multiple cycles. the core enters emulator mode when exception pro cessing begins. after the standard 8-byte exception stack is created, th e processor fetches a unique exce ption vector, 12, from the vector table. table 5-21. ddata[3:0]/csr[bstat] breakpoint response ddata[3:0]/csr[bstat] 1 1 encodings not shown are reserved for future use. breakpoint status 0000/0000 no breakpoints enabled 0010/0001 waiting for level-1 breakpoint 0100/0010 level-1 breakpoint triggered 1010/0101 waiting for level-2 breakpoint 1100/0110 level-2 breakpoint triggered
debug support MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 5-35 execution continues at the instruct ion address in the vector correspondi ng to the breakpoint triggered. all interrupts are ignored while the processor is in emulator mode. the debug in terrupt handler can use supervisor instructions to save the necessary context su ch as the state of all progr am-visible registers into a reserved memory area. when debug interrupt operati ons complete, the rte instruction execut es and the processor exits emulator mode. after the debug interrupt handler completes ex ecution, the external development system can use bdm commands to read the reserved memory locations. if a hardware breakpoint such as a pc trigger is le ft unmodified by the debug interrupt service routine, another debug interrupt is ge nerated after the completion of the rte instruction. 5.6.1.1 emulator mode emulator mode is used to facilitate non-intrusive emulat or functionality. this mode can be entered in three different ways: ? setting csr[emu] forces the processor into emulator mode. emu is examined only if rsti is negated and the processor begins reset exception processing. it can be set while the processor is halted before reset exception processing begins. see section 5.5.1, ?cpu halt .? ? a debug interrupt always puts the processor in emulation mode when debug interrupt exception processing begins. ? setting csr[trc] forces the processor into emulation mode when trace exception processing begins. while operating in emulation mode, the processor exhibits the following properties: ? all interrupts are ignored, including level-7 interrupts. ? if csr[map] = 1, all caching of memory and the sram module are di sabled. all memory accesses are forced into a specially mappe d address space signaled by tt = 0x2, tm = 0x5 or 0x6. this includes stack frame writes a nd the vector fetch for the excepti on that forced entry into this mode. the rte instruction exits emulation mode. the proc essor status output port provides a unique encoding for emulator mode entry (0xd) and exit (0x7). 5.6.2 concurrent bdm an d processor operation the debug module supports concurrent operation of both the processo r and most bdm commands. bdm commands may be executed while the processor is r unning, except those followi ng operations that access processor/memory registers: ? read/write address and data registers ? read/write control registers for bdm commands that access memory, the debug module requests the processor?s local bus. the processor responds by stalling the instruction fetch pipeline and waiting for current bus activity to complete before freeing the local bus for the debu g module to perform its ac cess. after the debug module bus cycle, the processor reclaims the bus.
debug support MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 5-36 freescale semiconductor breakpoint registers must be carefull y configured in a development syst em if the processor is executing. the debug module contains no hardware interlocks, so tdr should be di sabled while breakpoint registers are loaded, after which tdr can be wr itten to define the exact trigger. this prevents spurious breakpoint triggers. because there are no hardware interlocks in the de bug unit, no bdm operations are allowed while the cpu is writing the debug?s register s (dsclk must be inactive). note that the debug module requires the use of the internal bus to perform bdm comma nds. in revision a, if the processor is executing a tight loop that is contained within a single aligned longword, the processor may never grant the internal bus to the debug module, for example: align4 label1: nop bra.b label1 or align4 label2: bra.w label2 the processor grants the internal bus if these loops are forced across two longwords. 5.7 processor status, ddata definition this section specifies the coldfire processor and debug modul e?s generation of the pr ocessor status (pst) and debug data (ddata) output on an instruction ba sis. in general, the pst/ddata output for an instruction is defined as follows: pst = 0x1, {pst = [0x89b], ddata= operand} where the {...} definition is optional operand info rmation defined by the setting of the csr. the csr provides capabilities to di splay operands based on reference t ype (read, write, or both). a pst value {0x8, 0x9, or 0xb} identifies th e size and presence of valid data to follow on the ddata output {1, 2, or 4 bytes}. additionally, for certain change-of- flow branch instructions , csr[btb] provides the capability to display the target instruction addr ess on the ddata output {2, 3, or 4 bytes} using a pst value of {0x9, 0xa, or 0xb}. 5.7.1 user instruction set table 5-22 shows the pst/ddata specificat ion for user-mode instructions. rn represents any {dn, an} register. in this definition, the ?y? suffix generall y denotes the source and ?x ? denotes the destination operand. for a given instruction, the optional operand data is displayed only for thos e effective addresses referencing memory.the ?dd? nomencl ature refers to the ddata outputs.
debug support MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 5-37 table 5-22. pst/ddata specification for user-mode instructions instruction operand syntax pst/ddata add.l y,rx pst = 0x1, {pst = 0xb, dd = source operand} add.l dy,x pst = 0x1, {pst = 0xb, dd = source}, {pst = 0xb, dd = destination} addi.l #imm,dx pst = 0x1 addq.l #imm,x pst = 0x1, {pst = 0xb, dd = source}, {pst = 0xb, dd = destination} addx.l dy,dx pst = 0x1 and.l y,dx pst = 0x1, {pst = 0xb, dd = source operand} and.l dy,x pst = 0x1, {pst = 0xb, dd = source}, {pst = 0xb, dd = destination} andi.l #imm,dx pst = 0x1 asl.l {dy,#imm},dx pst = 0x1 asr.l {dy,#imm},dx pst = 0x1 bcc.{b,w} if taken, then pst = 0x5, else pst = 0x1 bchg #imm,x pst = 0x1, {pst = 0x8, dd = source}, {pst = 0x8, dd = destination} bchg dy,x pst = 0x1, {pst = 0x8, dd = source}, {pst = 0x8, dd = destination} bclr #imm,x pst = 0x1, {pst = 0x8, dd = source}, {pst = 0x8, dd = destination} bclr dy,x pst = 0x1, {pst = 0x8, dd = source}, {pst = 0x8, dd = destination} bra.{b,w} pst = 0x5 bset #imm,x pst = 0x1, {pst = 0x8, dd = source}, {pst = 0x8, dd = destination} bset dy,x pst = 0x1, {pst = 0x8, dd = source}, {pst = 0x8, dd = destination} bsr.{b,w} pst = 0x5, {pst = 0xb, dd = destination operand} btst #imm,x pst = 0x1, {pst = 0x8, dd = source operand} btst dy,x pst = 0x1, {pst = 0x8, dd = source operand} clr.b x pst = 0x1, {pst = 0x8, dd = destination operand} clr.l x pst = 0x1, {pst = 0xb, dd = destination operand} clr.w x pst = 0x1, {pst = 0x9, dd = destination operand} cmp.l y,rx pst = 0x1, {pst = 0xb, dd = source operand} cmpi.l #imm,dx pst = 0x1 divs.l y,dx pst = 0x1, {pst = 0xb, dd = source operand} divs.w y,dx pst = 0x1, {pst = 0x9, dd = source operand} divu.l y,dx pst = 0x1, {pst = 0xb, dd = source operand} divu.w y,dx pst = 0x1, {pst = 0x9, dd = source operand} eor.l dy,x pst = 0x1, {pst = 0xb, dd = source}, {pst = 0xb, dd = destination} eori.l #imm,dx pst = 0x1 ext.l dx pst = 0x1 ext.w dx pst = 0x1 extb.l dx pst = 0x1 jmp x pst = 0x5, {pst = [0x9ab], dd = target address} 1 jsr x pst = 0x5, {pst = [0x9ab], dd = target address}, {pst = 0xb , dd = destination operand} 1 lea y,ax pst = 0x1 link.w ay,#imm pst = 0x1, {pst = 0xb, dd = destination operand}
debug support MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 5-38 freescale semiconductor lsl.l {dy,#imm},dx pst = 0x1 lsr.l {dy,#imm},dx pst = 0x1 mac.l pst = 0x1 mac.l ry,rx pst = 0x1 mac.l ry,rx,ea,rw pst = 0x1, {pst = 0xb, dd = source operand} mac.w pst = 0x1 mac.w ry,rx pst = 0x1 mac.w ry,rx,ea,rw pst = 0x1, {pst = 0xb, dd = source operand} move.b y,x pst = 0x1, {pst = 0x8, dd = source}, {pst = 0x8, dd = destination} move.l y,x pst = 0x1, {pst = 0xb, dd = source}, {pst = 0xb, dd = destination} move.l y,acc pst = 0x1 move.l y,macsr pst = 0x1 move.l y,mask pst = 0x1 move.l acc,rx pst = 0x1 move.l macsr,ccr pst = 0x1 move.l macsr,rx pst = 0x1 move.l mask,rx pst = 0x1 move.w y,x pst = 0x1, {pst = 0x9, dd = source}, {pst = 0x9, dd = destination} move.w ccr,dx pst = 0x1 move.w {dy,#imm},ccr pst = 0x1 movem.l #list,x pst = 0x1, {pst = 0xb, dd = destination},... 2 movem.l y,#list pst = 0x1, {pst = 0xb, dd = source},... 2 moveq #imm,dx pst = 0x1 msac.l ry,rx pst = 0x1 msac.l ry,rx,ea,rw pst = 0x1, {pst = 0xb, dd = source}, {pst = 0xb, dd = destination} msac.w ry,rx pst = 0x1 msac.w ry,rx,ea,rw pst = 0x1, {pst = 0xb, dd = source}, {pst = 0xb, dd = destination} muls.l y,dx pst = 0x1, {pst = 0xb, dd = source operand} muls.w y,dx pst = 0x1, {pst = 0x9, dd = source operand} mulu.l y,dx pst = 0x1, {pst = 0xb, dd = source operand} mulu.w y,dx pst = 0x1, {pst = 0x9, dd = source operand} neg.l dx pst = 0x1 negx.l dx pst = 0x1 nop pst = 0x1 not.l dx pst = 0x1 or.l y,dx pst = 0x1, {pst = 0xb, dd = source operand} or.l dy,x pst = 0x1, {pst = 0xb, dd = source}, {pst = 0xb, dd = destination} ori.l #imm,dx pst = 0x1 pea y pst = 0x1, {pst = 0xb, dd = destination operand} pulse pst = 0x4 table 5-22. pst/ddata specification for user-mode instructions (continued) instruction operand syntax pst/ddata
debug support MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 5-39 exception processingpst = 0xc,{pst = 0xb,dd = destination},// stack frame {pst = 0xb,dd = destination},// stack frame {pst = 0xb,dd = source},// vector read pst = 0x5,{pst = [0x9ab],dd = target}// handler pc the pst/ddata specification for the reset exception is shown below: exception processingpst = 0xc, pst = 0x5,{pst = [0x9ab],dd = target} // handler pc the initial references at address 0 and 4 are never captured nor displa yed since these ac cesses are treated as instruction fetches. for all types of exception processing, the pst = 0xc value is driven at all times, unless the pst output is needed for one of the optional marker values or for the taken branch indicator (0x5). rems.l y,dx:dw pst = 0x1, {pst = 0xb, dd = source operand} remu.l y,dx:dw pst = 0x1, {pst = 0xb, dd = source operand} rts pst = 0x1, {pst = 0xb, dd = source operand}, pst = 0x5, {pst = [0x9ab], dd = target address} scc dx pst = 0x1 sub.l y,rx pst = 0x1, {pst = 0xb, dd = source operand} sub.l dy,x pst = 0x1, {pst = 0xb, dd = source}, {pst = 0xb, dd = destination} subi.l #imm,dx pst = 0x1 subq.l #imm,x pst = 0x1, {pst = 0xb, dd = source}, {pst = 0xb, dd = destination} subx.l dy,dx pst = 0x1 swap dx pst = 0x1 trap #imm pst = 0x1 3 trapf pst = 0x1 tst.b x pst = 0x1, {pst = 0x8, dd = source operand} tst.l x pst = 0x1, {pst = 0xb, dd = source operand} tst.w x pst = 0x1, {pst = 0x9, dd = source operand} unlk ax pst = 0x1, {pst = 0xb, dd = destination operand} wddata.b y pst = 0x4, {pst = 0x8, dd = source operand wddata.l y pst = 0x4, {pst = 0xb, dd = source operand wddata.w y pst = 0x4, {pst = 0x9, dd = source operand 1 for jmp and jsr instructions, the optional target instruction address is displayed only for those effective address fields defining variant addressing modes. this includes the following x values: (an), (d16,an), (d8,an,xi), (d8,pc,xi). 2 for move multiple instructions (movem), the processor auto matically generates line-sized transfers if the operand address reaches a 0-modulo-16 boundary and there are four or more regi sters to be transferred. for these line-sized transfers, the operand data is never captured nor disp layed, regardless of the csr value. the automatic line-sized burst transfers are provided to ma ximize performance during these sequential memory access operations. 3 during normal exception processing, the pst output is driven to a 0xc indicating the exception processing state. the exception stack write operands, as well as the vector read and target address of the exception handler may also be displayed. table 5-22. pst/ddata specification for user-mode instructions (continued) instruction operand syntax pst/ddata
debug support MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 5-40 freescale semiconductor 5.7.2 supervisor instruction set the supervisor instruction set has complete access to the user mode instructions plus the opcodes shown below. the pst/ddata specificati on for these opcodes is shown in table 5-23 . the move-to-sr and rte instructions include an optional pst = 0x3 value, indicating an entry into user mode. additionally, if the execution of a rte inst ruction returns the proce ssor to emulator mode, a multiple-cycle status of 0xd is signaled. similar to the exception processing mode, the stopped state (pst = 0xe) and the halted state (pst = 0xf) display this status throughout th e entire time the coldfire processor is in the given mode. table 5-23. pst/ddata specification for supervisor-mode instructions instruction operand syntax pst/ddata cpushl pst = 0x1 halt pst = 0x1, pst = 0xf move.w sr,dx pst = 0x1 move.w {dy,#imm},sr pst = 0x1, {pst = 0x3} movec ry,rc pst = 0x1 rte pst = 0x7, {pst = 0xb, dd = source operand}, {pst = 3}, { pst =0xb, dd =source operand}, pst = 0x5, {[pst = 0x9ab], dd = target address} stop #imm pst = 0x1, pst = 0xe wdebug y pst = 0x1, {pst = 0xb, dd = source, pst = 0xb, dd = source}
debug support MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 5-41 5.8 freescale-recommended bdm pinout the coldfire bdm connector, figure 5-41 , is a 26-pin berg connector arranged 2 x 13. figure 5-41. recommended bdm connector 1 3 5 7 9 11 13 15 17 19 21 23 25 2 4 6 8 10 12 14 16 18 20 22 24 26 developer reserved 1 gnd gnd reset pad-voltage2 gnd pst2 pst0 ddata2 ddata0 freescale reserved gnd core-voltage bkpt dsclk developer reserved 1 dsi dso pst3 pst1 ddata3 ddata1 gnd freescale reserved pstclk 2supplied by target 1pins reserved for bdm developer use. t e a
debug support MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 5-42 freescale semiconductor
MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 6-1 chapter 6 system integration module (sim) this chapter provides detailed opera tion information regarding the syst em integration module (sim). it describes the sim programming model, bus arbitr ation, power management, and system-protection functions for the MCF5272. 6.1 features the sim, shown in figure 6-1 , provides overall control of the bus a nd serves as the interface between the coldfire core processor complex a nd the internal peripheral devices. figure 6-1. sim block diagram sdram controller external bus interface system integration module (sim) 32-bit address bus 32-bit data bus interrupt controller cs [7:0] 88 8 4 icrs mbar piwr csors csbrs int [6:1] 6 dram controller outputs pivr pitr isr wrrr wirr alpr pmr system control base address dir identification sdram control sdcr parallel port four tw o ua rt s dma ethernet general- purpose timers v2 coldfire processor complex control signals chip select module spr scr wcr wer usb qspi plic pacnt? pdcnt paddr? pcddr pa d r ? pcdr sdram timer sdtr pwm
system integration module (sim) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 6-2 freescale semiconductor the following is a list of the key sim features: ? module base address register (mbar) ? base address location of all internal periphera ls, sim resources, and memory-mapped registers ? address space masking to intern al peripherals and sim resources ? interrupt controller ? programmable interrupt level (1?7) for internal peripheral interrupts ? up to six external interrupt request inputs ?see chapter 7, ?interrupt controller .? ? chip select module ? eight dedicated progr ammable chip selects ? address masking for memory block sizes from 4 kbytes to 2 gbytes ? programmable wait states and port sizes ? programmable address setup ? programmable address hold for read and write ? sdram controller interf ace supported with cs7 /sdcs see chapter 8, ?chip select module .? ? system protection ? hardware watchdog timer. see section 6.2.3, ?system confi guration register (scr) .? ? software watchdog timer. see section 6.2.8, ?software watchdog timer ? pin assignment register (par) configures the parallel port. see section 6.2.3, ?system configuration register (scr) .? ? power management ? individual control for each on-chip peripheral ? choice of low-power modes see section 6.2.5, ?power manage ment register (pmr) .? ? bus arbitration ? configure arbitration for inte rnal bus among coldfire core, ethernet controller, and dma controller. see section 6.2.3, ?system confi guration register (scr) .? 6.2 programming model the following sections describe the re gisters incorporated into the sim. 6.2.1 sim register memory map table 6-1 shows the memory map for the sim register s. the internal registers in the sim are memory-mapped registers offset from the mbar address pointer define d in mbar[ba]. this supervisor-level regist er is described in section 6.2.2, ?module base a ddress register (mbar) .? because sim registers depend on the base address defined in mbar[ba], mbar must be programmed before sim registers can be accessed.
system integration module (sim) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 6-3 6.2.2 module base address register (mbar) the supervisor-level mbar, figure 6-2 , specifies the base address and allowable access types for all internal peripherals. it is written with a movec instruction using the cpu address 0xc0f. (see the coldfire family programmer?s reference manual .) mbar can be read or written through the debug module as a read/write register, as described in.? once mbar has been initialized, it can be read and written in supervisor mode at the address programmed into the base address (ba) field. the valid bit, mbar[v], is cleared at system reset to prevent incorrect references before mbar is written; other mbar bits are uniniti alized at reset. to access internal peripherals, write mbar with the appropriate base address (ba) a nd set mbar[v] after system reset. all internal peripheral register s occupy a single relocatable memory block along 64-kbyte boundaries. if mbar[v] is set, mbar[ba] is compared to the uppe r 16 bits of the full 32-bit internal address to table 6-1. sim registers mbar offset [31:24] [23:16] [15:8] [7:0] 0x000 module base address register (mbar), after initialization [p. 6-3] 0x004 system configuration register (scr) [p. 6- 5] system protection register (spr) [p. 6-6] 0x008 power management register (pmr) [p. 6-7] 0x00c reserved active low power register (alpr) [p. 6-10] 0x010 device identification register (dir) [p. 6-11] 0x014? 0x01c reserved interrupt controller registers 0x020 interrupt control register 1 (icr1) [p. 7-4] 0x024 interrupt control register 2 (icr2) [p. 7-5] 0x028 interrupt control register 3 (icr3) [p. 7-5] 0x02c interrupt control register 4 (icr4) [p. 7-5] 0x030 interrupt source register (isr) [p. 7-6] 0x034 programmable interrupt transition register (pitr) [p. 7-7] 0x038 programmable interrupt wakeup register (piwr) [p. 7-8] 0x03c reserved programmable interrupt vector register (pivr) [p. 7-9] software watchdog registers 0x280 watchdog reset reference register (wrrr) [p. 6-12] reserved 0x284 watchdog interrupt reference register (wirr) [p. 6-12] reserved 0x288 watchdog counter register (wcr) [p. 6-13] reserved 0x28c watchdog event register (wer) [p. 6-13] reserved
system integration module (sim) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 6-4 freescale semiconductor determine if an internal periphe ral is being accessed. mbar masks sp ecific address spaces using the address space fields. attempts to access a masked address space generate an external bus access. addresses hitting overlapping memory spaces take the following priority: 1. sram, rom, and cache 2. mbar 3. chip select thus, if an overlapping address hits in the sram, rom, or cache, the sim will not generate a bus cycle, either externally or to an on-chip peripheral. note the mbar region must be mapped to non-cacheable space. table 6-2 describes mbar fields. the following example shows how to set the mbar to location 0x1000_0000 using the d0 register. setting mbar[v] validates the mbar location. this example a ssumes all accesses are valid: move.1 #0x10000001,do movec do,mbar 31 16 15 5 4 3 2 1 0 field ba ? sc sd uc ud v reset undefined 0 r/w w initially through movec; r/w af ter initialization in supervisor mode address cpu + 0x0c0f initially; mbar+0x000 after initialization figure 6-2. module base address register (mbar) table 6-2. mbar field descriptions bits field description 31?16 ba base address. defines the base address for a 64-kbyte address range . 15?5 ? reserved, should be cleared. 4 sc setting masks supervisor code space in mbar address range 3 sd setting masks supervisor data space in mbar address range 2 uc setting masks user code space in mbar address range 1 ud setting masks user data space in mbar address range 0 v valid. determines whether mbar settings are valid. 0 mbar contents are invalid. 1 mbar contents are valid. attribute mask bits
system integration module (sim) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 6-5 6.2.3 system configuration register (scr) the system configuration register (scr), figure 6-3 , provides information and control for a variety of system features. table 6-3 describes scr fields. 15 14 13 12 11 9 8 7 6 5 4 3 2 0 field 1 0 rstsrc ? priority ar softrst ? buslock hwr reset 1 0 see ta b l e 6 - 3 0000_1000_0111 r/w r/w; except for rstsrc[ 1:0], which are read only address mbar + 0x004 figure 6-3. system configuration register (scr) table 6-3. scr field descriptions bits field description 15-14 ? reserved. bit 15 always reads as a 1, bit 14 as a 0. writing to these bits has no effect. 13?12 rstsrc reset source. indicates the source of the last device reset. 00 reserved 01 rsti asserted, dreseten not asserted 10 software watchdog 11 rsti and dreseten asserted 11?9 ? reserved, should be cleared. 8 priority selects the bus arbiter priority scheme. 0 ethernet has highest priority, dma has next highest priority, cpu has lowest priority. 1 cpu has highest priority, dma has next highest priority, ethernet has lowest priority. this bit should be cleared if the ethernet module is enabled. 7 ar assume request. selects the bus mastership scheme. 0 current bus master relinquishes the bus after the current bus cycle. 1 assume current bus master wants the bus for the next bus cycle and include it in the arbitration process. if ar is set and the current bus master has a higher priority than other requesting masters but is not requesting the bus for the next cycle, there is a 1 clock dead cycle be fore the arbiter can reassign the bus to the next highest priority master. 6 softrst writing a one to this bit resets the on-chip peripherals, excluding the chip select module, interrupt controller module, gpio module, and sdram controller, and asserts rsto . the cpu is not reset. the reset remains asserted for 128 clock cycles. this bit is automatically cl eared on negation of the reset. 5?4 ? reserved, should be cleared.
system integration module (sim) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 6-6 freescale semiconductor 6.2.4 system protection register (spr) the system protection register (spr), figure 6-4 , provides information about bus cycles that have generated error conditions. these error conditions ca n optionally generate an access error exception by using the enable bits. figure 6-4. system protection register (spr) table 6-4 describes spr fields. 3 buslock locks the ownership of the bus. 0 ownership of the bus is determined by arbitration. 1 current bus master retains ownership of the bus indefinitely. 2?0 hwr hardware watchdog reference. de termines how many clocks to wait before timing out a bus cycle when spr[hwten] is set. the value programmed should be longer than the response time of the slowest external peripheral in the system. 000 128 001 256 010 512 011 1024 100 2048 101 4096 110 8192 111 16384 15 14 13 12 11 10 9 8 field adc wpv smv pe hwt rpv ext suv reset 0000_0000 r/w r/w 76543210 field adcen wpven smven peen hwten rpven exten suven reset 0000_1011 r/w r/w address mbar + 0x006 table 6-4. spr field descriptions bits fields description 15, 7 adc, adcen address decode conflict. this bit is set when an addr ess matches against two chip selects. if adcen is also set, the bus cycle is terminated with an access error exception. 14, 6 wpv, wpven write protect violation. this bit is set when a write acce ss is attempted to an area for which the chip select is set to read only. if wpven is also set, the bus cycle is terminated with an access error exception. 13, 5 smv, smven stopped module violation. this bit is set when an access is attempted to an on-chip peripheral whose clock has been stopped. if smven is also set, the bus cycle is terminated with an access error exception. 12, 4 pe, peen peripheral error. this bit is set when an access to an on-chip peripheral is terminated with a transfer error. if peen is also set, the bus cycle is terminated with an access error exception. table 6-3. scr field descriptions (continued) bits field description
system integration module (sim) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 6-7 6.2.5 power management register (pmr) the power management register (pmr), figure 6-5 , is used to control the various low-power options including low-power sleep, low-power stop, an d powering down indivi dual on-chip modules. table 6-5 describes pmr fields. 11, 3 hwt, hwten hardware watchdog timeout. this bit is set w hen the hardware watchdog timer has reached its programmed timeout value. if hwten is also set, the bus cycle is terminated with an access error exception. 10, 2 rpv, rpven read protect violation. this bit is set when a read ac cess is attempted to an area for which the chip select is set to write only. if rpven is also set, the bus cycle is terminated wit h an access error exception. 9, 1 ext, exten external transfer error. this bit is set when an ex ternal transfer error is reported to the sim on tea . if exten is also set, the bus cycle is term inated with an access error exception. 8, 0 suv, suven supervisor/user violation. this bit is set when a user mode access is attempted to an area for which the chip select is set to supervisor only. if suven is al so set, the bus cycle is term inated with an access error exception. 31 30 27 26 25 24 field bdmpdn ? enetpdn plipdn drampdn reset 0000_0000 r/w r/w, supervisor mode only 23 22 21 20 19 18 17 16 field dmapdn pwmpdn qspipdn timerpd n gpiopdn usbpdn uart1pdn uart0pdn reset 0000_0000 r/w r/w, supervisor mode only 15 11 10 9 8 field ? usbwk uart1wk uart0wk reset 0000_0000 r/w r/w, supervisor mode only 76 5 4 3 0 field ? mos slpen ? reset 0000_0000 r/w r/w, supervisor mode only address mbar+0x008 figure 6-5. power management register (pmr) table 6-4. spr field descriptions (continued) bits fields description
system integration module (sim) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 6-8 freescale semiconductor table 6-5. pmr field descriptions bits field description 31 bdmpdn debug power-down enable. controls the clocking to the debug module. 0 clock enabled. 1 clock disabled. 30?27 ? reserved, should be cleared. 26 enetpdn ethernet power-down enable. controls the clocking to the ethernet module. 0 clock enabled. 1 clock disabled. 25 plipdn plic power-down enable. controls the clocking to the plic module. 0 clock enabled. 1 clock disabled. 24 drampdn dram controller power-down enable. contro ls the clocking to the dram controller module. 0 clock enabled. 1 clock disabled. 23 dmapdn dma controller power-down enable. contro ls the clocking to the dma controller module. 0 clock enabled. 1 clock disabled. 22 pwmpdn pwm power-down enable. controls the clocking to the pwm module. 0 clock enabled. 1 clock disabled. 21 qspipdn qspi power-down enable. controls the clocking to the qspi module. 0 clock enabled. 1 clock disabled. 20 timerpdn timer power-down enable. controls the clocking to the timer module. 0 clock enabled. 1 clock disabled. 19 gpiopdn parallel port power-down enable. controls the clocking to the parallel port module. 0 clock enabled. 1 clock disabled. 18 usbpdn usb power-down enable. controls the clocking to the usb module. clocking to the usb module may be turned on by usd_d+ or int1 /usb_wor, at which time this bit is automatically cleared. 0 clock enabled. 1 clock disabled. 17 uart1pdn uart1 power-down enable. controls the clocking to the uart1 module. clocking to the uart1 module may be restored when a change in signal level is detected on uart1rxd, at which time this bit is automatically cleared. 0 clock enabled. 1 clock disabled. 16 uart0pdn uart0 power-down enable. controls the clocking to the uart0 module. clocking to the uart0 module may be restored when a change in signal level is detected on uart0rxd, at which time this bit is automatically cleared. 0 clock enabled. 1 clock disabled. 15-11 ? reserved, should be cleared.
system integration module (sim) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 6-9 table 6-6 details the interaction between the pdn a nd wk bits for the usb and usart modules. 10 usbwk usb wakeup enable. allows clocking to the usb module to be restored when a change in signal level is detected on usd_d+ or int1 /usb_wor. see ta b l e 6 - 6 for a description of the interaction between the pdn and wk bits. 0 wakeup disabled. 1 wakeup enabled. usbpdn must also be set. 9 uart1wk uart1 wakeup enable. allows clocking to the uart1 module to be restored when a change in signal level is detected on uart1rxd. see ta b l e 6 - 6 for a description of the interaction between the pdn and wk bits. 0 wakeup disabled. 1 wakeup enabled. uart1pdn must also be set. 8 uart0wk uart0 wakeup enable. allows clocking to the uart0 module to be restored when a change in signal level is detected on uart0rxd. see ta b l e 6 - 6 for a description of the interaction between the pdn and wk bits. 0 wakeup disabled. 1 wakeup enabled. uart0pdn must also be set. 7-6 ? reserved, should be cleared. 5 mos main oscillator stop. allows the MCF5272 to be put into stop mode, in which internal clocking is stopped to the entire processor. to enter stop mode, the us er must write to the alpr and then execute a stop instruction. see section 6.2.6, ?activate low-power register (alpr) .? it is not necessary to put any on-chip modules in power down mode. after setting th is bit, a write access must be made to the alpr register to actually enter stop mode. d[31:0] are driven low, and other bus signals are negated. stop mode is exited when an interrupt is detected on one the external interrupt pins, int [6:1]. 0 stop mode disabled. 1 stop mode enabled. 4 slpen sleep enable. allows the MCF5272 to be put into sleep mode in which internal clocking to the cpu is disabled.to enter sleep mode, the user must write to the alpr and then execute a stop instruction. see section 6.2.6, ?activate low-power register (alpr) .? individual modules may have clocking disabled through the appropriate pdn bits. after slpen is set, a write access must be made to alpr to actually enter sleep mode. d[ 31:0] are driven low, and other bus signals are negated. sleep mode is exited when an interrupt is detected from an on-chip peripheral or one of the external interrupt pins, int [6:1]. 0 sleep mode disabled. 1 sleep mode enabled. 3-0 ? reserved, should be cleared. table 6-6. usb and usart power down modes pdn wk description 0 x module powered up and operating normally. 1 0 module in power down and can only be reactivated by clearing pdn. 1 1 module in power down and can be reactivated by clearing pdn or detecting signal on the receive pins. table 6-5. pmr field descriptions (continued) bits field description
system integration module (sim) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 6-10 freescale semiconductor 6.2.6 activate low-power register (alpr) alpr, figure 6-6 , is used to put the MCF5272 into a low pow er mode (sleep or st op). a low-power mode is activated by a write access with any data to alpr followed by a stop instruction. the sequence to enter sleep mode is as follows: 1. set power down and wakeup enable bits in the pmr as desired; set pmr[slpen]. 2. set the cpu interrupt priority level in the status register (sr). interrupts below this level do not reactivate the cpu. note that a ny interrupt will cause the proce ssor to exit low-power mode, but only unmasked interrupts will cause the processor to resume operation. 3. perform a write access with any data to alpr. 4. execute the stop instruction. this must be the next instruction executed after the write to the alpr. sleep mode is exited by an interrupt request from by ei ther an external device or an on-chip peripheral as detailed in table 6-7 . the sequence to enter stop mode is: 1. set pmr[mos]; clear pmr[slpen]. 2. set the cpu interrupt priority level in the status register (sr). interrupts below this level do not reactivate the cpu. 3. perform a write access with any data to alpr. 4. execute the stop instruction. this must be the next instruction executed after the write to the alpr. stop mode is exited by an interrupt request from an external de vice as detailed in table 6-7 . 15 0 field alphr reset 0000_0000_0000_0000 r/w write only address mbar + 0x00e figure 6-6. activate low-power register (alpr) table 6-7. exiting sleep and stop modes interrupt source exit sleep exit stop usb wake-on-ring interrupts, int6 ?int2 ye s ye s n o interrupt, int1 ye s ye s ye s usart1, usart2 yes, interrupt and rx signal change no no qspi yes no no usb yes, interrupt and rx signal change no no plic yes, interrupt no no general purpose i/o no no no
system integration module (sim) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 6-11 6.2.7 device identification register (dir) the dir, figure 6-7 , contains a value representing the identi fication mark for the MCF5272 device. this register contains the same value as the jtag idcode register. the version number field will change if a new revision of the MCF5272 is created. figure 6-7. device identification register (dir) table 6-8 describes the dir fields. 6.2.8 software watchdog timer the software watchdog timer prevents system lockup s hould the software become trapped in loops with no controlled exit. the software watchdog timer can be enabled or disabled through wrrr[en]. if enabled, the watchdog timer requires the periodic exec ution of a software watchdog servicing sequence. if this periodic servicing action does not occur, the timer counts until it reaches the reset timeout value, resulting in a hardware reset with rsto driven low for 16 clocks. scr[ rstsrc] is updated to indicate that the software watchdog caused the reset. general purpose timers yes, interrupt no no ethernet yes, interrupt no no dma controller yes, interrupt no no pwm no no no hardware watchdog timer no no no software watchdog timer yes, interrupt no no 31 28 27 22 21 12 11 1 0 field version number design center device number jedec id ? value 0010 fork75n 0100_01 00_0000_0011 0000_0001_110 1 r/w read only address mbar+0x010 table 6-8. dir field descriptions bits description 31?28 version number. indicates the revision number of the MCF5272. 27?22 design center. indicates the coldfire design center 21?12 device number. indicates an MCF5272 11?1 indicates the reduced jedec id for freescale. joint electron device engineering council (jedec) publication 106-a and chapter 11 of the ieee standard 1149.1 give more information on this field. table 6-7. exiting sleep and stop modes (continued) interrupt source exit sleep exit stop usb wake-on-ring
system integration module (sim) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 6-12 freescale semiconductor if an interrupt timeout va lue is programmed in wirr, and this valu e is reached prior to the reset timeout value, wer[wie] is set and a mask able interrupt is issued at the level defined by icr4[swtoipl]. the software watchdog consists of a 15-bit counter with a 15- bit prescaler. it counts up to a maximum of 32768, with a resolution of 32768 cloc k periods. thus, at 66 mhz, the resolution of the watchdog is 0.5 msec, with a maximum timeout period of 32768 * 32768 = 2 30 clock periods or 16.267 s. timeout = (wrrr +1) * 32768 clocks 6.2.8.1 watchdog reset re ference register (wrrr) the watchdog reset refere nce register (wrrr), figure 6-8 , contains the reference value for the software watchdog timeout causing a reset. table 6-9 describes wrrr fields. 6.2.8.2 watchdog interrupt reference register (wirr) the watchdog interrupt reference register (wirr), figure 6-9 , contains the reference value for the software watchdog timeout causing an interrupt. table 6-10 describes wirr fields. 15 10 field ref en reset 1111_1111_1111_1110 r/w r/w address mbar + 0x280 figure 6-8. watchdog reset reference register (wrrr) table 6-9. wrrr field descriptions bits field description 15?1 ref reference value. this field determines the reset ti meout value.reset initializes this register to 0xfffe, disabling the watchdog timer and setting it to the maximum timeout value. 0 en enable watchdog. when enabled, software should periodically write to wcr to avoid reaching the reset reference value. 0 watchdog timer disabled. 1 watchdog timer enabled. 15 10 field ref ien reset 1111_1111_1111_1110 r/w r/w address mbar + 0x284 figure 6-9. watchdog interrupt reference register (wirr)
system integration module (sim) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 6-13 6.2.8.3 watchdog counter register (wcr) the wcr, figure 6-10 , contains the 16 most significant bits of the software watchdog counter. writing any value to wcr resets the counter and prescale r and should be executed on a regular basis if the watchdog is enabled. 6.2.8.4 watchdog event register (wer) the wer, figure 6-11 , reports when the watchdog ti mer reaches the wirr value. table 6-11 describes wer fields. table 6-10. wirr field descriptions bits field description 15-1 ref reference value. contains the reference value for the watchdog timeout causing an interrupt. 0 ien enable interrupt. when enabled, software should periodically write to wcr to avoid reaching the interrupt reference value. 0 disable interrupt. 1 enable interrupt upon reaching interrupt reference valu e. if ien is set when wer[wie] = 1, an immediate interrupt occurs. 15 0 field count reset 0000_0000_0000_0000 r/w r/w address mbar + 0x288 figure 6-10. watchdog counter register (wcr) 15 10 field ? wie reset 0000_0000_0000_0000 r/w r/w address mbar + 0x28c figure 6-11. watchdog event register (wer) table 6-11. wer field descriptions bits field description 15?1 ? reserved, should be cleared. 0 wie watchdog interrupt event. 0 wirr value has not been reached. 1 wirr value has been reached. wie is cleared by writing a 1 to it. the timer does not neg ate the interrupt request to the interrupt controller until wie is cleared. wie is set regardless of the state of wirr[ien]; however, an interrupt is not asserted to the controller unless wirr[ien] = 1.
system integration module (sim) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 6-14 freescale semiconductor
MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 7-1 chapter 7 interrupt controller this chapter describes the operati on of the interrupt controller portion of the system integration module (sim). it includes descriptions of the registers in the interrupt controller memory map and the interrupt priority scheme. 7.1 overview the sim provides a centralized interrupt controller for all MCF5272 interrupt sources, which consist of the following: ? external interrupts int [6:1] ? timer modules ? uart modules ? plic module ? usb module ? dma module ? ethernet module ? qspi module ? software watchdog timer (swt) figure 7-1 is a block diagram of the interrupt controller. the sim provides the following registers for managing interrupts: ? four interrupt control registers (icr1?icr4), whic h are used to assign interrupt levels to the interrupt sources. ? the interrupt source register (i sr) allows reading the instantaneous value of each interrupt source. ? the programmable interrupt trans ition register (pitr) specifies the triggering transition of the external interrupt inputs. ? the programmable interrupt wa keup register (piwr) specifie s which interrupt sources can reactivate the cpu from low-power sleep or stop mode. ? the programmable interrupt vector register (pivr) specifies whic h vector number is returned in response to an interrupt acknowledge cycle.
interrupt controller MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 7-2 freescale semiconductor figure 7-1. interrupt controller block diagram 7.2 interrupt controller registers the interrupt controller register porti on of the sim memory map is shown in table 7-1 . all external interrupt inputs are edge sensitive, wi th the active edge being programmable through pitr. an interrupt must remain asserted for at least th ree consecutive rising edge s of cpu_extclk to be considered valid. the priority level of each in terrupt source is progr ammed through the icrs. the MCF5272 does not support au to-vectored interrupts. interrupt serv ice routines for all interrupts should have vectors in the user-defined interrupt region of the vector tabl e (vectors 64?255). the location of these vectors is programmable through the pivr. for more information on the servicing of interrupts, see table 7-1. interrupt controller registers mbar offset [31:24] [23:16] [15:8] [7:0] 0x020 interrupt control register 1 (icr1) [p. 7-4] 0x024 interrupt control register 2 (icr2) [p. 7-5] 0x028 interrupt control register 3 (icr3) [p. 7-5] 0x02c interrupt control register 4 (icr4) [p. 7-5] 0x030 interrupt source register (isr) [p. 7-6] 0x034 programmable interrupt transition register (pitr) [p. 7-8] 0x038 programmable interrupt wakeup register (piwr) [p. 7-9] 0x03c reserved programmable interrupt vector register (pivr) [p. 7-9] system integration module (sim) interrupt controller 4 icrs piwr int [1:6] 6 pivr pitr isr software watchdog four tw o ua rt s dma ethernet general- purpose timers usb qspi plic
interrupt controller MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 7-3 chapter 2, ?coldfire core .? pending interrupts from external sources (int [6:1]) can be cleared using the icrs. for an interrupt to be successfully processed, stack ram must be avai lable. a programma ble chip select is often used for the ram, in which case, the ra m is not immediately available at startup. thus, no interrupts are recognized until pivr is initialized. the ram chip select and system stack should be set up before this initialization. if more than one interrupt source has the same interrupt priority level (ipl), the interrupt controller daisy chains the interrupts with the priority order fo llowing the bit placement in the piwr, with int1 having the highest priority and swto having the lowest priority, as shown in figure 7-8 . 7.2.1 interrupt controller registers this section describes the registers asso ciated with the interrupt controller. table 7-2 gives the nomenclature used for the interrupt and power management registers. table 7-2. interrupt and power management register mnemonics mnemonic or portion thereof description int1, int2, int3, int4, int5, int6 external interrupt signals 1?6. tmr0, tmr1, tmr2, tmr3 timers 3?0 from timer module usb0, usb1, usb2, usb3, usb4, usb5, usb6, usb7 usb endpoint 0?7 uart1, uart2 uart1, uart2 modules plip plic 2-khz periodic interrupt, 2b+d data plia plic asynchronous and maintenance channels interrupt dma dma controller interrupt etx ethernet module transmit data interrupt erx ethernet module receive data interrupt entc ethernet module non-time-critical interrupt qspi queued serial peripheral interface ipl2, ipl1, ipl0 interrupt priority level bits 2?0 pi pending interrupt pdn power down enable wk wakeup enable swto software watchdog timer time out
interrupt controller MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 7-4 freescale semiconductor 7.2.2 interrupt control registers (icr1?icr4) icr1?icr4 are used to configure interrupts from various on- and off-chip sources. when read, the data is the last value written to the register with the exception of the pi bits, which are transitory functions. these registers can be accessed as 8-, 16-, or 32-bit registers. an 8- or 16-bi t write leaves the remaining bits intact. to avoid altering other ipl fields when resetting interrupts genera ted by int[6:1], read the required byte, word, or longword from the appropriate icr, and.b/w/l it s value with a mask whose ipl bits are all 1 and whose pi bits are 1 for those sources whose pi bit is to be reset and 0 for those sources whose pi bit is to be left unchanged. 7.2.2.1 interrupt control register 1 (icr1) icr1, figure 7-2 , is used to configure interrupts from various on- and off-chip sources. table 7-3 describes icr1 fields. 31 30 28 27 26 24 23 22 20 19 18 16 field int1pi int1ipl int2pi int2ipl int3pi int3ipl int4pi int4ipl reset 0000_0000_0000_0000 15 14 12 11 10 8 7 6 4 3 2 0 field tmr0pi tmr0ipl tmr1pi tmr1ipl tmr2pi tmr2ipl tmr3pi tmr3ipl reset 0000_0000_0000_0000 r/w r/w addr mbar + 0x020 figure 7-2. interrupt control register 1 (icr1) table 7-3. icr field descriptions bits name description 31, 27, 23, 19, 15, 11, 7, 3 pi pending interrupt. writing a 1 enables the value for the corresponding ipl field to be set. note: for external interrupts only, writing a one to this bit clears the corresponding interrupt latch. the external interrupt must be toggled before another interrupt is latched. for all on-chip interrupt sources, this bit is cleared when the interrupt is cleared in the module registers. 0 no interrupt pending 1 an interrupt is pending. 30?28, 26?24, 22?20, 18?16, 14-12, 10?8, 6?4, 2?0 ipl interrupt priority level. spec ifies the ipl for the corresponding interrupt source. this field can be changed only when a 1 is simultaneously written to the corresponding pi bit. 000 the corresponding int source is inhibited and cannot generat e interrupts. the state of the signal can still be read in the isr. 001?111the corresponding int source is enabled and generates an interrupt with the indicated priority level.
interrupt controller MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 7-5 7.2.2.2 interrupt control register 2 (icr2) icr2, figure 7-3 , is used to configure interrupt s from various on-chip sources. table 7-3 describes icr2 fields. 7.2.2.3 interrupt control register 3 (icr3) icr3, figure 7-4 , is used to configure interrupt s from various on-chip sources. table 7-3 describes icr3 fields. 7.2.2.4 interrupt control register 4 (icr4) icr4, figure 7-5 , is used to configure interrupt s from various on-chip sources. table 7-3 describes icr4 fields. 31 30 28 27 26 24 23 22 20 19 18 16 field uart1pi uart11ipl uart2pi uar t2ipl plippi plipipl pliapi pliaipl reset 0000_0000_0000_0000 15 14 12 11 10 8 7 6 4 3 2 0 field usb0pi usb0ipl usb1pi usb1ip l usb2pi usb2ipl usb3pi usb3ipl reset 0000_0000_0000_0000 r/w r/w addr mbar + 0x024 figure 7-3. interrupt control register 2 (icr2) 31 30 28 27 26 24 23 22 20 19 18 16 field usb4pi usb41ipl usb5pi usb5 ipl usb6pi usb6ipl usb7pi usb7ipl reset 0000_0000_0000_0000 15 14 12 11 10 8 7 6 4 3 2 0 field dmapi dmaipl erxpi erxipl etxpi etxipl entcpi entcipl reset 0000_0000_0000_0000 r/w r/w addr mbar + 0x028 figure 7-4. interrupt control register 3 (icr3) 31 30 28 27 26 24 23 22 20 19 18 16 field qspipi qspiipl int5pi int5i pl int6pi int6ipl swtopi swtoipl reset 0000_0000_0000_0000 15 0 field ? reset 0000_0000_0000_0000 r/w r/w addr mbar + 0x02c figure 7-5. interrupt control register 4(icr4)
interrupt controller MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 7-6 freescale semiconductor 7.2.3 interrupt source register (isr) the interrupt source register (isr), figure 7-6 , is used to read the instantaneous value of all interrupt sources, both internal and external. no te that the register bits give th e value of the interrupt source prior to input synchronization or polarity correction. table 7-4 describes isr fields. 31 30 29 28 27 26 25 24 field int1 int2 int3 int4 tmr0 tmr1 tmr2 tmr3 reset xxxx_1111 r/w read only 23 22 21 20 19 18 17 16 field uart1 uart2 pli_p pli_a usb0 usb1 usb2 usb3 reset 1111_1111 r/w read only 15 14 13 12 11 10 9 8 field usb4 usb5 usb6 usb7 dma erx etx entc reset 1111_1111 r/w read only 76 5 4 3 0 field qspi int5 int6 swto ? reset 1xx1_0000 r/w read only address mbar+0x030 figure 7-6. interrupt source register (isr) table 7-4. isr field descriptions bits field description 31?4 ? 0 interrupt source is high. 1 interrupt source is low. 3?0 ? reserved, should be cleared.
interrupt controller MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 7-7 7.2.4 programmable interrupt transition register (pitr) the programmable interrupt tr ansition register (pitr), figure 7-7 , specifies the triggering (either high-to-low or low-to-high) on each of the external interrupt inputs. table 7-5 describes pitr fields. 31 30 29 28 27 16 field int1 int2 int3 int4 ? reset 0000_0000_0000_0000 15 7654 0 field ? int5 int6 ? reset 0000_0000_0000_0000 r/w r/w addr mbar + 0x034 figure 7-7. programmable interrupt transition register (pitr) table 7-5. pitr field descriptions bits name description 31?28, 6, 5 ? 0 triggering edge of external interrupt input is high-to-low (negative edge triggered). 1 triggering edge of external interrupt input is low -to-high (positive edge triggered). 27?7, 4?0 ? reserved, should be cleared.
interrupt controller MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 7-8 freescale semiconductor 7.2.5 programmable interrupt wakeup register (piwr) the programmable interrupt wakeup register (piwr), figure 7-8 , is used to specify which interrupt sources are capable of causing the cpu to wake up from low-power sleep or stop modes when their source is active. all sources are disabled on rese t. note that only the external interrupt pins int [6:1] can wake up the cpu from stop mode. if more than one interrupt source has the same inte rrupt priority level (ipl) programmed in the icrs, the interrupt controller daisy chains th e interrupts with the priority order following the bit placement in the piwr, with int1 having the highest priority and swto having the lowest priority as shown in figure 7-8 . table 7-6 describes piwr fields. 31 30 29 28 27 26 25 24 field int1 int2 int3 int4 tmr0 tmr1 tmr2 tmr3 reset 1111_1111 r/w r/w 23 22 21 20 19 18 17 16 field uart1 uart2 pli_p pli_a usb0 usb1 usb2 usb3 reset 1111_1111 r/w r/w 15 14 13 12 11 10 9 8 field usb4 usb5 usb6 usb7 dma erx etx entc reset 1111_1111 r/w r/w 76 5 4 3 0 field qspi int5 int6 swto ? reset 1111_0000 r/w r/w address mbar+0x038 figure 7-8. programmable interrupt wakeup register (piwr) table 7-6. piwr field descriptions bits field description 31?4 ? 0 interrupt cannot wake up the cpu when interrupt source is active. 1 interrupt wakes up the cpu from low-power modes. 3?0 ? reserved, should be cleared.
interrupt controller MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 7-9 7.2.6 programmable interrupt vector register (pivr) the programmable interrupt vector register (pivr), figure 7-9 , specifies the vector numbers the interrupt controller returns in response to interrupt acknowledge cycles for th e various peripherals and discrete interrupt sources. pending interrupts are presented to the processor core in order of priority from highest to lowest. the core responds to an interrupt request by initiating an inte rrupt acknowledge cycle to receive a vector number, which allows the core to locate the interrupt?s service r outine. the interrupt controll er is able to identify the source of the highest priority interrupt that is being acknowledged and provide th e interrupt vector to the core. the three most significant bits of the inte rrupt vector are programmed by the user in the pivr. the lower five bits are provided by the interrupt controller, depending on the source, as shown in table 7-7 . if the core initiates an interrupt acknowledge cycl e prior to the pivr being programmed, the interrupt controller returns the uninitialized interrupt vector (0x0f). if the core initiates an interrupt acknowledge cycle after the pivr has been init ialized, but there is no interrupt pe nding, the interrupt controller returns the user a spurious interrupt vector (0x xxx 0_0000). because the interrupt controller responds to all interrupt acknowledges, a bus error situation ca nnot occur during an interrupt-acknowledge cycle. figure 7-9. programmable interrupt vector register (pivr) table 7-7 describes pivr fields. 754 0 field iv ? reset 0000_1111 r/w r/w address mbar + 0x03f table 7-7. pivr field descriptions bits field description 7-5 iv these bits provide the high three bits of the interrup t vector for interrupt acknowledge cycles from all sources. to conform to the core interrupt vector allocation, these bits should be set equal to or greater than 010. see ta b l e 2 - 3 . 4-0 ? reserved, should be cleared.
interrupt controller MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 7-10 freescale semiconductor table 7-8 lists the values for the five least significant bi ts of the interrupt vector. the vector numbers shown assume pivr [iv]=0b010. if another value of pivr[iv] is used, the v ector numbers would change accordingly. table 7-8. MCF5272 interrupt vector table vector number bits 4?0 source function 64 00000 reserved user spurious interrupt 65 00001 int1 external interrupt input 1 66 00010 int2 external interrupt input 2 67 00011 int3 external interrupt input 3 68 00100 int4 external interrupt input 4 69 00101 tmr0 timer 0 70 00110 tmr1 timer 1 71 00111 tmr2 timer 2 72 01000 tmr3 timer 3 73 01001 uart1 uart 1 74 01010 uart2 uart 2 75 01011 plip plic 2khz periodic 76 01100 plia plic asynchronous 77 01101 usb0 usb endpoint 0 78 01110 usb1 usb endpoint 1 79 01111 usb2 usb endpoint 2 80 10000 usb3 usb endpoint 3 81 10001 usb4 usb endpoint 4 82 10010 usb5 usb endpoint 5 83 10011 usb6 usb endpoint 6 84 10100 usb7 usb endpoint 7 85 10101 dma dma controller 86 10110 erx ethernet receiver 87 10111 etx ethernet transmitter 88 11000 entc ethernet module non-time-critical 89 11001 qspi queued serial peripheral interface 90 11010 int5 external interrupt input 5 91 11011 int6 external interrupt input 6 92 11100 swto software watchdog timer timeout 93 11101 reserved reserved 94 11110 reserved reserved 95 11111 reserved reserved
MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 8-1 chapter 8 chip select module this chapter describes the chip sele ct module, including the chip select registers, the configuration and behavior of the chip select signals, and the global chip select functions. 8.1 overview the chip select module provides user-programmable cont rol of the eight chip select and four byte strobe outputs. this subsection describes the operation and programming model of the chip select registers, including the chip select base and option registers. 8.1.1 features the following list summarizes the key chip select features: ? eight dedicated progr ammable chip selects ? address masking for memory block sizes from 4 kbytes to 2 gbytes ? programmable wait states and port sizes ? programmable address setup ? programmable address hol d for read and write ? sdram controller interf ace supported with cs7 /sdcs ? global chip select functionality 8.1.2 chip select usage each of the eight chip selects, cs 0 ?cs7 , is configurable for external sram, rom, and pe ripherals. cs0 is used to access external boot rom and is enabled af ter a reset. the data bus width of the external rom must be configured at reset by having appropriate pull-down re sistors on qspi_clk/busw1 and qspi_cs0/busw0. at reset th ese two signals replace the bus width field in the chip select 0 base register (csbr0[bw]). cs7 must be used for enabling an external sdram ar ray. in this mode, it is referred to as sdcs . note a detailed description of each bus access type supported by the MCF5272 device is given in chapter 20, ?bus operation .?
chip select module MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 8-2 freescale semiconductor 8.1.3 boot cs0 operation cs0 is enabled after reset and is used to acc ess boot rom. the memory port width of cs0 is defined by the state of qspi_clk/busw1 and qspi_cs0/busw0. these two bits s hould be configured to define the width of the boot rom connected to cs0 , as described in section 19.18, ?operating mode configuration pins .? 8.2 chip select registers each chip select is controlled th rough two 32-bit registers. the chip se lect base registers (csbr0?csbr7) are used to enable the chip select and to configur e the base address, port si ze, bus interface type, and address space. the chip select opt ion registers (csor0?cso r7) are used to confi gure the address mask, additional setup/hold, extended burst capabi lity, wait states, and read/write access. table 8-1. cscr and csor values after reset offset name chip select register reset + 0x040 csbr0 cs base register 0 0x0000_0x01 1 1 the nibble shown as x resets as 00 xx, where the undefined bits represent the bw field. qspi_c s0/busw0 and qspi_clk/busw1 program the bus width for cs0 at reset + 0x044 csor0 cs option register 0 0xffff_f078 + 0x048 csbr1 cs base register 1 0x0000_1300 + 0x04c csor1 cs option register 1 0xffff_f078 + 0x050 csbr2 cs base register 2 0x0000_2300 + 0x054 csor2 cs option register 2 0xffff_f078 + 0x058 csbr3 cs base register 3 0x0000_3300 + 0x05c csor3 cs option register 3 0xffff_f078 + 0x060 csbr4 cs base register 4 0x0000_4300 + 0x064 csor4 cs option register 4 0xffff_f078 + 0x068 csbr5 cs base register 5 0x0000_5300 + 0x06c csor5 cs option register 5 0xffff_f078 + 0x070 csbr6 cs base register 6 0x0000_6300 + 0x074 csor6 cs option register 6 0xffff_f078 + 0x078 csbr7 cs base register 7 0x0000_7700 + 0x07c csor7 cs option register 7 0xffff_f078
chip select module MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 8-3 8.2.1 chip select base registers (csbr0?csbr7) the csbrs, figure 8-1 , provide a model internal bus cycle agains t which to match actual bus cycles to determine whether a specific chip select should assert. a bus cycle in a specific ch ip select register causes the assertion of the corresponding external chip select. table 8-2 describes csbr n fields. 31 12 11 10 9 8 7 6 5 4 2 1 0 field ba ebi bw super tt tm ctm enable reset csbr0: 0x0000_0 x 01 1 ; csbr1: 0x0000_1300; csbr2: 0x0000_2300; csbr3: 0x0000_3300; csbr4: 0x0000_4300; csbr5: 0x0000_5300 ; csbr6: 0x0000_6300; csbr7: 0x0000_7700 r/w r/w addr 0x040 (csbr0); 0x048 (csbr1); 0x050 (csbr2); 0x058 (csbr3); 0x060 (csbr4); 0x068 (csbr5); 0x070 (csbr6); 0x078 (csbr7) figure 8-1. chip select base registers (csbr n ) table 8-2. csbr n field descriptions bits name description 31?12 ba base address. the starting address of the memory sp ace covered by the chip select. ba is compared with bits 31?12 of the access to determine whether the cu rrent bus cycle is intended for this chip select. any combination of ba bits can be masked in the associated csor. 11?10 ebi external bus interface modes. these modes are used to multiplex outputs and determine timing of the appropriate bus interface module onto the device pins. 00 16-/32-bit sram/rom. for 16-/32-bit wide memory de vices with byte strobe inputs. csbr0[ebi] = 00 at reset. affects all chip selects. 01 sdram. one physical bank of sdram consisting of 16?256 mbit devices. csor7[ws] must be set to 0x1f. affects only cs7 /sdcs . 10 reserved 11 use sram/rom timing for 8-bit devices without byte strobe inputs. 9?8 bw bus width. determines data bus size of the me mory-mapped resource for all chip selects except cs0 . it is assumed that boot code for the processor is accessed through the global chip select cs0 , so the initial bus width for this chip select mu st be configured at reset. qspi_c s0/busw0 and qspi_clk/busw1 are used to program the bus width for cs0 at reset. 00 longword (32 bits) 01 byte (8 bits) 10 word (16 bits) 11 cache line (32 bits) 7 super supervisor mode. 0 bus cycle may be in user or supervisor mode ( neglecting conditions im posed by setting ctm). 1 the chip select asserts a match only if the transfer modifier indicates a supervisor mode access. a user access matching ba causes an access error. super, ctm, tt, and tm are used to restrict bus access . for example, if tt and tm indicate a user data access and super and ctm are both set, no accesses can occur. 6?5 tt transfer type. tt and tm may be used to further qual ify the address match. if ctm is set, tt and tm must match the access types for the chip select to assert. see the description of tm.
chip select module MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 8-4 freescale semiconductor table 8-3 describes the interaction between csbr n [ebi], oe /rd, r/w , and sdwe . note the MCF5272 compares the address for the current bus transfer with the address and mask bits in the csbr s and csors looking for a match. the priority is listed in table 8-4 (from highest priority to lowest priority): 4?2 tm transfer modifier. operates with tt to determine the access type. tt tm function 0x 000 reserved 0x 001 user data access 0x 010 user instruction access 0x 011?100 reserved 0x 101 supervisor data access 0x 110 supervisor instruction access 0x 111 reserved 10 000?100 reserved 10 101 emulator mode data access 10 110 emulator mode instruction access 10 111 reserved 11 000 cpu space access 11 001 interrupt acknowledge level 1 11 010 interrupt acknowledge level 2 11 011 interrupt acknowledge level 3 11 100 interrupt acknowledge level 4 11 101 interrupt acknowledge level 5 11 110 interrupt acknowledge level 6 11 111 interrupt acknowledge level 7 1 ctm compare tm. enables comparison between the access type and the tm and tt bits. 0 tt and tm register bits do not affect address match. 1 tt and tm register bits must match the access type for an address match to occur. 0 enable enable. disables/enables the chip select. when disabled, the chip select is never asserted, regardless of the address on the internal bus. enable is 0 at reset, except cs0 which is 1. 0 chip select is disabled, no matches can occur and chip select output cannot assert. 1 chip select is enabled, bus cycles are compared against register contents. table 8-3. output read/write strobe levels versus chip select ebi code ebi ebi function access type oe /rd r/w sdwe 00 sram, rom write high low high read low high high 01 sdram write high high low read high high high 11 sram, rom write high low high read low high high table 8-2. csbr n field descriptions (continued) bits name description
chip select module MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 8-5 8.2.2 chip select option registers (csor0?csor7) csor0?csor7, figure 8-2 , are used to configure the address mask, additiona l setup/hold, extended burst capability, wait states , and read/write access. table 8-5 describes csor n fields. table 8-4. chip select memory address decoding priority priority chip select highest chip select 0 chip select 1 chip select 2 chip select 3 chip select 4 chip select 5 chip select 6 lowest chip select 7 31 12 11 10 9 8 7 6 2 1 0 field bam aset wrah rdah extburst ? ws rw mrw reset 0xffff_f078 r/w r/w addr 0x044 (csor0); 0x04c (csor1); 0x054 (csor2); 0x05c (csor3); 0x064 (csor4); 0x06c (csor5); 0x074 (csor6); 0x07c (csor7) figure 8-2. chip select option registers (csor n ) table 8-5. csor n field descriptions name name description 31?12 bam address mask. masks equivalent csor[ba] bits. th e bam setting chooses which ba bits to compare with the corresponding address bit to determine a match. 0 mask address bit 1 compare address bit 11 aset address setup enable. controls assertion of chip se lect with respect to assertion of a valid address that hits in the chip select address space. 0 assert chip select on the rising edge of clk that address is asserted. 1 delay assertion of chip select for one clk cycle after address is asserted. during write transfers, both chip select and r/w are delayed by 1 clock cycle. r/w asserts 1 clock cycle after as sertion of the chip select. 10 wrah controls the address, data, and attribute hold ti me after the termination, internal or external with ta , of a write cycle that hits in t he chip select address space. 0 do not hold address, data, a nd attribute signals an extra cycl e after chip select and r/w negate on writes. 1 hold address, data, and attribute signals an extra cycle after cs x and r/w negate on writes.
chip select module MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 8-6 freescale semiconductor 9 rdah controls the address and attribute hold time after the termination, internal or external with ta , of a read cycle that hits in the ch ip select address space. 0 do not hold address an d attribute signals an extra cycle afte r chip select negates on reads. 1 hold address and attribute signals an extra cycle after chip select negate on reads. 8 extburst enable extended burst. valid only for cs7 . reserved bit for cs [0:5]. extburst should be 1 when external sdram is configured for a data bus na rrower than the width programmed for the MCF5272. ebi must be set for sdram and the bw must be set to the data bus width of the external sdram array. example: if the MCF5272 external physical data bus wi dth is 32 or 16 bits but the external sdram is 16 bits wide, extburst must be set and bw must be 10 (word) for sdcs . 0 extended bursts are not enabled. 1 extended bursts are enabled. 7 ? reserved, should be cleared. 6?2 ws wait state generator. specifies the number of wait states (in system clocks) needed before the sim generates an internal transfer acknowledge signal to terminate the access. 0x00 no wait states 0x01 1 wait state ... 0x1e 30 wait states 0x1f external access for example, ws = 0x0a introduces a 10-clock wait before the bus cycle term inates; 0x1f indicates a source external to the chip select module terminates the access. for sram and rom accesses ebi codes 00 or 11 and ws = 0x1f, ta must be driven from an external source to terminate the bus cycle, otherwise the on-chip bus timeout moni tor issues a bus error exception. for sram and rom accesses with ebi = 00 or 11 and ws = 0x00?0x1e, the chip select module terminates the bus cycle after the programmed number of system clocks. for sdram accesses with sdcs , ebi = 01, and ws = 0x1f, bus cycles are terminated under control of the sdram controller. the csor0[ws] reset default is 0x1e. the default for all other csors is 0x00. caution: never drive ta as an input to terminate sdram peripheral accesses. 1 rw rw and mrw determine whether the selected memory region is read only or write only. 0 read only 1 write only 0 mrw mrw must be set for value of rw be taken into consideration. 0 memory covered by chip select is read/write. the me mory covered by the chip select is neither read nor write protected. 1 rw determines whether memory covered by chip select is read only or write only. a conflict causes either a read or write protect violation. table 8-5. csor n field descriptions (continued) name name description
MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 9-1 chapter 9 sdram controller this chapter describes configurat ion and operation of the synchronous dram controller component of the sim including a general description of signals involved in sdram operations . it provides interface information for memory configurat ions using most common sdram devi ces for both 16- and 32-bit wide data buses. the chapter conclude s with signal timing diagrams. 9.1 overview the MCF5272 incorporates an sdram controll er, whose main featur es are as follows: ? glueless interface to a variety of jedec-compliant sdram devices. ? MCF5272 data bus width of 16 or 32 bits to sdram memory array ? 16- to 256-mbit device support ? dedicated bank address pins to provide pin out compatibility fo r different sdram sizes with a single printed circuit board layout ? page size from 256?1024 column address locations ? 6-1-1-1 timing for burst-read; 3- 1-1-1 timing for burst-write acce sses (assuming a page hit at 66 mhz) ? cas latencies of 1 and 2 ? up to four concurrently activated banks ? sdram power down and self refresh ? refresh timer prescaler supports system clock down to 5 mhz ma intaining a 15.6-s refresh cycle ? auto initialization of sdram 9.2 sdram controller signals the sdram controller provides all required signa ls for glueless interfacing to a variety of jedec-compliant sdram devices. ras/cas a ddress multiplexing a nd the sdram pin a10 auto-precharge function is software configurable for different page sizes. to ma intain refresh capability without conflicting with concurrent ac cesses on the address and data buses, ras0 , cas0 , sdwe , sdba[0:1], sdclke, a10_prechg, and the sdra m bank selects are dedicated sdram signals. figure 9-1 shows the sdram controll er signal configuration.
sdram controller MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 9-2 freescale semiconductor figure 9-1. sdram controller signals table 9-1 describes sdram controller signals. table 9-1. sdram controller signal descriptions signal description a10_prechg a10 precharge strobe. a precharge cycle occurs only after a page miss. duri ng precharge, the sdram writes the designated on-chip ram page buffer back into the sdram array. precharge latency is set in sdtr[rp]. the reset value is 2 cycles, rp = 01. bs [3:0] for sdram devices, these outputs should be connected to individual dqm signals. during sdram accesses, these signals indicate a byte transfer between sdram and the MCF5272 when asserted. note that most sdrams associate dq m3 with the msb, in which case bs3 should be connected to the sdram's dqm3 input, and so forth. cas0 sdram column address strobe output dreseten dreseten is asserted to indicate that the sdra m controller is to be reset whenever rsti asserts. if dreseten is negated, rsti does not affect the sdram controller, which continues to refresh external memory. this is useful for debug situatio ns where a reset of the de vice is required without losing data located in sdram. dreseten is normally tied high or low depending on system requirements. it should never be tied to rsti or rsto . ras0 sdram row address strobe output sda[13:0]/ a[22:0] fourteen address signals are multiplexed to form sdram_adr[13:0], which are used for connecting to sdram devices as large as 256 mbits. sdram can be configured for 16- or 32-bit wide interface to the MCF5272 data bus. for an sdram array with a 32-bit data bus, sdram address signals are multiplexed starting with a2. for a 16-bit data bus, address signals are multiplexed starting with a1. sdba[1:0] sdram controller bank address select outputs. assigned to internal high-order address signals by programming sdcr[baloc]. this allows using sdra m devices of different sizes without changing the board layout. see ta bl e 9 - 7 . sdram controller 1 1 1 1 4 2 1 1 sdramcs /cs7 ras0 cas0 sdwe bs [3:0] sdba[1:0] sdclke sdclk a10_prechg a[22:15] d[31:0] 8 32 address multiplexer dynamic bus sizer internal 32-bit address bus 1 a[14:13/sda[12:11] 2 a[11:2]/sda[9:0] 10
sdram controller MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 9-3 figure 9-2 is the pinout of a 16-bit sdra m in a 54-pin tsop (t hin, small-outline pack age) package. size can vary from 16?256 mbits. figure 9-2. 54-pin tsop sdram pin definition sdclk sdram (bus) clock (same frequency as cpu clock) . this dedicated output reduces setup and hold time uncertainty due to process and temperature variations. sdclk is disabled for sdram power-down mode. sdclke sdram clock enable sdramcs /cs7 sdram chip select/cs7 . the sdram is assigned to cs7 (sdramcs ) of the device chip select module. sdwe sdram write enable table 9-1. sdram controller si gnal descriptions (continued) signal description vdd dq0 vdd dq1 dq2 gnd dq3 dq4 vdd dq5 dq6 gnd dq7 vdd dqml r/w cas ras cs ba0 ba1 a10 a0 a1 a2 a3 vdd gnd dq15 gnd dq14 dq13 vdd dq12 dq11 gnd dq10 dq9 vdd dq8 gnd nc dqmh clk cke a12 a11 a9 a8 a7 a6 a5 a4 gnd 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 vdd dq0 vdd dq1 dq2 gnd dq3 dq4 vdd dq5 dq6 gnd dq7 vdd dqml r/w cas ras cs ba0 ba1 a10 a0 a1 a2 a3 vdd vdd dq0 vdd dq1 dq2 gnd dq3 dq4 vdd dq5 dq6 gnd dq7 vdd dqml r/w cas ras cs ba0 ba1 a10 a0 a1 a2 a3 vdd gnd dq15 gnd dq14 dq13 vdd dq12 dq11 gnd dq10 dq9 vdd dq8 gnd nc dqmh clk cke a12 a11 a9 a8 a7 a6 a5 a4 gnd gnd dq15 gnd dq14 dq13 vdd dq12 dq11 gnd dq10 dq9 vdd dq8 gnd nc dqmh clk cke a12 a11 a9 a8 a7 a6 a5 a4 gnd 256 mbit 128 mbit 64 mbit
sdram controller MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 9-4 freescale semiconductor table 9-2 shows how bs [3:0] should be connected to dqm x for 16- and 32-bit sd ram configurations. 9.3 interface to sdram devices the following tables describes pos sible memory configurations usi ng most common sdram devices for 16- and 32-bit wide data buses. a device?s data bus width affects it s connection to sdram address pins. a device can be configured for external data bus width of 16 or 32 bits by appropriate configuration of the wsel signal during reset. see section 19.18, ?operating m ode configuration pins .? the following tables describe address pin connections and internal address multiplexing. table 9-2. connecting bs [3:0] to dqm x 5272 sdram data signals 16 bit 32 bit 16 bit 32 bit (2 x 16) 32 bit (1 x 32) bs3 bs3 dqmh dqmh dqm3 d[31:24] bs2 bs2 dqml dqml dqm2 d[23:16] nc bs1 nc dqmh dqm1 d[15:8] nc bs0 nc dqml dqm0 d[7:0] table 9-3. configurations for 16-bit data bus parameter 8-bit 16-bit 16 mbits 64 mbits 16 mbits 64 mbits 128 mbits 256 mbits number of devices 2 1 total size 4 mbytes 16 mbytes 2 mbytes 8 mbytes 16 mbytes 32 mbytes total page size 1 kbyte 1 kbyte 512 kbytes 512 kbytes 1 kbyte 1 kbyte number of banks 2 4 2 4 4 4 refresh count in 64 ms 4k 4k 4k 4k 4k 8k table 9-4. configurations for 32-bit data bus parameter 8-bit 16-bit 32-bit 16 mbits 64mbits 16 mbits 64 mbits 128 mbits 256 mbits 64 mbits 128 mbits number of devices 4 2 1 total size 8 mbytes 32 mbytes 4 mbytes 16 mbytes 32 mbytes 64 mbytes 8 mbytes 16 mbytes total page size 2 kbytes 2 kbytes 1 kbyte 1 kbyte 2 kbytes 2 kbytes 1 kbyte 1 kbyte number of banks 2 4 2 4 4 4 4 4 refresh count in 64 ms 4k 4k 4k 4k 4k 8k 4k 8k
sdram controller MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 9-5 table 9-5. internal address multiplexing (16-bit data bus) device pin sdram pin 8-bit 16-bit 16 mbits 64 mbits 16 mbits 6 4 mbits 128 mbits 256 mbits a1 a0 a1/a10 a1/a10 a1/a9 a1/a9 a1/a10 a1/a10 a2 a1 a2/a11 a2/a11 a2/a10 a2/a10 a2/a11 a2/a11 a3 a2 a3/a12 a3/a12 a3/a11 a3/a11 a3/a12 a3/a12 a4 a3 a4/a13 a4/a13 a4/a12 a4/a12 a4/a13 a4/a13 a5 a4 a5/a14 a5/a14 a5/a13 a5/a13 a5/a14 a5/a14 a6 a5 a6/a15 a6/a15 a6/a14 a6/a14 a6/a15 a6/a15 a7 a6 a7/a16 a7/a16 a7/a15 a7/a15 a7/a16 a7/a16 a8 a7 a8/a17 a8/a17 a8/a16 a8/a16 a8/a17 a8/a17 a9 a8 a9/a18 a9/a18 a17 a17 a9/a18 a9/a18 a10 a9 a19 a19 a18 a18 a19 a19 a10_prechg a10/ap a20 a20 a19 a19 a20 a20 a12 a11 a21 a20 a21 a21 a13 a12 a22 sdba0 ba0 a21 a22 a20 a21 a22 a23 sdba1 ba1 a23 a22 a23 a24 table 9-6. internal address multiplexing (32-bit data bus) device pin sdram pin 8-bit 16-bit 32-bit 16 mbits 64 mbits 16 mbits 64 mbits 128 mbits 256 mbits 64 mbits 128 mbits a2 a0 a2/a11 a2/a11 a2/a10 a2/a10 a2/a11 a2/a11 a2/a10 a2/a10 a3 a1 a3/a12 a3/a12 a3/a11 a3/a11 a3/a12 a3/a12 a3/a11 a3/a11 a4 a2 a4/a13 a4/a13 a4/a12 a4/a12 a4/a13 a4/a13 a4/a12 a4/a12 a5 a3 a5/a14 a5/a14 a5/a13 a5/a13 a5/a14 a5/a14 a5/a13 a5/a13 a6 a4 a6/a15 a6/a15 a6/a14 a6/a14 a6/a15 a6/a15 a6/a14 a6/a14 a7 a5 a7/a16 a7/a16 a7/a15 a7/a15 a7/a16 a7/a16 a7/a15 a7/a15 a8 a6 a8/a17 a8/a17 a8/a16 a8/a16 a8/a17 a8/a17 a8/a16 a8/a16 a9 a7 a9/a18 a9/a18 a9/a17 a9/a17 a9/a18 a9/a18 a9/a17 a9/a17 a10 a8 a10/a19 a10/a19 a18 a18 a10/a19 a10/a19 a18 a18 a11 a9 a20 a20 a19 a19 a20 a20 a19 a19 a10_prechg a10/ap a21 a21 a20 a20 a21 a21 a20 a20 a13 a11 a22 a21 a22 a22 a21 a14 a12 a23 sdba0 ba0 a22 a23 a21 a22 a23 a24 a21 a22 sdba1 ba1 a24 a23 a24 a25 a22 a23
sdram controller MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 9-6 freescale semiconductor 9.4 sdram banks, page hits, and page misses sdrams can have up to four ba nks addressed by sdba1 and sdba0. the two uppermost address lines of the memory space are mapped to sdba1 and sd ba0. specific address lines mapped depend on the size of the sdram array and are defined in the sdcr. each of the four bank addre ss registers holds the page a ddress (lower bits of row address) of an activated page. each bank can have one open page. a device wi th two banks can have two open pages. a device with four banks can have four open pages. the lower addresses of the row addre ss are compared against the page addr ess register cont ent. if it does not match, the sdram controller precharges the ope n page on the accessed ba nk and activates the new required page. after this, the sdram controller executes the read or write command. concurrently, the page address register of the bank is updated. this is called a page miss. after a bank is activated, it remains activated until the next page access causing a page miss. a precharge of a deactivated bank is al lowed and simply ignored by the sdram. if a memory access is to an open page only the read or write command is issued to the sdram. this is called a page hit. in two-page sdrams, banks 2 and 3 are invalid and must not be addressed. to avoi d address aliasing, the user should restrict the chip select addr ess range to the space available in the sdrams. 9.5 sdram registers the sdram configuration register (sdcr) and the sdram ti ming register (sdtr) are described in the following sections. note that sdram provides a mode register that is not part of the sdram controller memory model. the sdram mode register is automatically c onfigured during initialization. 9.5.1 sdram configuration register (sdcr) sdcr is used to configure the sdram controller a ddress multiplexers for th e type of sdram devices used on the system board. table 9-7 describes sdcr fields. 15 14 13 12 11 10 8 7 6 5 4 3 2 1 0 write ? mcas ? baloc gsl ? reg inv sleep act init reset 0 00 00 001 0 00 0 1 0 0 0 r/w read/write read-only r/w addr mbar + 0x0182 figure 9-3. sdram configur ation register (sdcr)
sdram controller MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 9-7 table 9-7. sdcr field descriptions bits name description 15 ? reserved, should be cleared. 14?13 mcas maximum cas address. determines which device address output carries the column address msb. for example, if the sdram device has eight column addre sses and the data bus is configured for 32 bits, the column address appears on a[9:2], so the maximum co lumn address is a9. the lsb of the row address is therefore taken from internal address signal a10 and is used by the sdram controller to control address multiplexing. 00 a7 01 a8 10 a9 11 a10 12?11 ? reserved, should be cleared. 10?8 baloc bank address location. determines the internal addresses that become sdram bank addresses. sdba1sdba0 000reserved 001a21a20 010a22a21 011a23a22 100a24a23 101a25a24 110reserved 111reserved 7 gsl go to sleep. setting gsl powers down t he sdram and puts it into auto-refresh mode. 6?5 ? reserved, should be cleared. 4 reg register read data for 66 mhz. writing a 1 to reg enables pipeline mode for read data access. it forces the sdram controller to register the read data, adding one wait state to single-read accesses and to the first word read during a burst. reg must be 1 for clock frequencies above 48 mhz to meet input setup timing for data input (see electrical characteristics timing sd16). the description of inv shows how reg and inv interact. 3 inv invert clock. inverts sdram clock output for timing refinement. if reg = 0 0 do not add wait state for read accesses. 1 shift sdclk edge 180 o if reg = 1 0 add wait state for read accesses, all frequencies 1 invalid, do not use. 2 sleep sleep mode. this read-only status bit goes high when setting sdcr[gsl] has taken effect and the sdram is powered down. sleep is cleared when sdram is in auto-refresh mode. 1 act active. this read-only status bit goes high when th e sdram controller completes its initialization. act is cleared by writing to sdcr. 0 init initialization enable. setting init enables init ialization of the sdram based on other sdcr bit values. initialization starts after the first dummy write acce ss to the sdram. csor7, csbr7, and sdtr must be configured before setting init. caution: csor7[waitst] must equal 0x1f when cs7 /sdcs is configured for sdram.
sdram controller MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 9-8 freescale semiconductor 9.5.2 sdram timing register (sdtr) the sdtr is used to configure sd ram controller refresh counters for the type of sdram devices used and the number of clocks required for each type of sdram access. th e reset value is 0x2115. for lower cpu clock frequencies, precharge and activate times can be reduced to eliminate up to 2 clock cycles from the read and write accesses. consult the da ta sheets of the sdrams being considered. table 9-8 describes sdtr fields. 15 10 9 8 7 6 5 4 3 2 1 0 write rtp rc ? rp rcd clt reset 0010_00 01 00 01 01 01 r/w r/w addr mbar + 0x0186 figure 9-4. sdram timing register (sdtr) table 9-8. sdtr field descriptions bits name description 15?10 rtp refresh timer prescaler. determines the number of clock cycles x 16 between refreshes. the following table describes different recommended prescaler settings for different clock frequencies including a margin of 1.2 s. recommended values are as follows: rtp 15.6 s = 1/f*rtp*16 system clock 111101 61 66 mhz 101011 43 48 mhz 011101 29 33 mhz 010110 22 25 mhz 000100 4 5 mhz (emulator) 9?8 rc refresh count. indicates the number of clock cycles spent in refresh state (rc + 5). refresh occurs during the first of these clock cycles; the rest of the time is the delay that must occur before the sdram is ready to do anything else. 00 5 cycles 01 6 cycles (default) 10 7 cycles 11 8 cycles 7?6 ? reserved, should be cleared. 5?4 rp precharge time. specifies number of cl ock cycles taken for a precharge (rp + 1). 00 1 cycle 01 2 cycles (default) 10 3 cycles 11 4 cycles
sdram controller MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 9-9 9.6 auto initialization each sdram requires an in itialization sequen ce before it can be accesse d. after power up, the sdram requires a certain time (100 s) before it can accept the first command of the initialization procedure. after this time, one precharge all command and eight refresh commands are require d. after initialization, an initiate load register set command is executed, which writes the sdram configuration into the sdram device mode register. sdram mode register data is transferred on the a ddress signals, so all sdra m devices are configured simultaneously. initialization is enabled by setting sdcr[init] a nd performing a dummy write to the sdram address space. the sdram controller executes the required precharge and refresh commands and automatically loads the mode register, which configures the sdram as follows: ? sdram internal burst is always disabled. ? cas latency is defined by sdtr[clt]. sdcr[act] is set after initialization. 9.7 power-down and self-refresh the sdram can be powered down by setting sdcr[gsl]. the sdram controller executes the required power-down command sequence to ensure self-ref resh during power down. the sdram controller completes the current memory access then automatical ly issues the following commands to force the sdram into sleep mode: precharge all banks nop auto refresh command in self-refresh mode, sdram de vices can refresh themselves wi thout an external clock. after power-down completes, sdcr[sleep] is set, the sdra m clock output is driven high, and sdclke is driven low. 3?2 rcd ras-to-cas delay. the reset value is 1, requiring 2 clock cycles for sdram activation. 00 1 cycle 01 2 cycles (default) 10 3 cycles 11 4 cycles 1?0 clt cas latency. specifies the delay programmed into th e sdram mode register during initialization, indicating the time between a read command being issued to the sdram and data appearing on the pins. the sdram controller uses this value to sequence its state machine during read operations. clt cannot be changed after the mode re gister is written. 00 reserved 01 2-cycle cas latency (default) 1x reserved table 9-8. sdtr field descriptions (continued) bits name description
sdram controller MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 9-10 freescale semiconductor to wake up the sdrams, sdcr[gsl] must be cl eared. sdcr[sleep] remains set while the sdram is exiting sleep mode and is cleared when the sdram completes the corre ct sequence to exit sleep mode. 9.8 performance the maximum performance of the sd ram controller is determined by the required number of cycles for page activation and precharge. the read access is influenced by the cas latency. all sdram accesses are in page mode. the following ta ble shows the number of required cy cles including all dead cycles for each type of read/write sdram access. it assume s default timing configurat ion using an at least pc100-compliant sdram device at 66 mh z. page miss latency includes th e cycles to precharge the last open page and activate the new page before the read/write access. there are no precharge cycles when an address hits an open page. in table 9-9 , the timing configuration is rtp = 61, rc = negligible, rcd = 0 (or 1), rp = 1 (or 0), and clt = 1. in table 9-10 , the timing configuration is rtp = 61, rc = negligible, rcd = 0, rp = 0, and clt = 1. table 9-9. sdram controller performance, 32-bit port, (rcd = 0, rp = 1) or (rcd = 1, rp = 0) sdram access number of system clock cycles reg = 0, inv = 0 reg = 1, inv = 0 single-beat read page miss 8 9 page hit 5 6 single-beat write page miss 6 6 page hit 3 3 burst read page miss 8-1-1-1 = 11 9-1-1-1 = 12 page hit 5-1-1-1 = 8 6-1-1-1 = 9 burst write page miss 6-1-1-1 = 9 6-1-1-1 = 9 page hit 3-1-1-1 = 6 3-1-1-1 = 6 table 9-10. sdram controller performance, 32?bit port, (rcd = 0, rp = 0) sdram access number of system clock cycles reg = 0, inv = 0 reg = 1, inv = 0 single-beat read page miss 7 8 page hit 5 6 single-beat write page miss 5 5 page hit 3 3 burst read page miss 7-1-1-1 = 10 8-1-1-1 = 11 page hit 5-1-1-1 = 8 6-1-1-1 = 9 burst write page miss 5-1-1-1 = 8 5-1-1-1 = 8 page hit 3-1-1-1 = 6 3-1-1-1 = 6
sdram controller MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 9-11 in table 9-11 , the timing configuration is rtp = 61, rc = negligible, rcd = 1, rp = 1, and clt = 1. in table 9-12 , the timing configuration is rtp = 61, rc = ne gligible, rcd = 0 (or 1), rp = 1 (or 0), and clt = 1. table 9-11. sdram controller performa nce (rcd = 1, rp = 1), 16-bit port sdram access number of system clock cycles reg = 0, inv = 0 reg = 1, inv = 0 single-beat read page miss 9 10 page hit 5 6 single-beat longword read page miss 9-1 10-1 page hit 5-1 6-1 single-beat write page miss 7 7 page hit 3 3 single-beat longword write page miss 7-1 7-1 page hit 3-1 3-1 burst read page miss 9-1-1-1-1-1-1-1 = 16 10-1-1-1-1-1-1-1 = 17 page hit 5-1-1-1-1-1-1-1 = 12 6-1-1-1-1-1-1-1 = 13 burst write page miss 7-1-1-1-1- 1-1-1 = 14 7-1-1-1-1-1-1-1 = 14 page hit 3-1-1-1-1-1-1-1 = 10 3-1-1-1-1-1-1-1 = 10 table 9-12. sdram controller perfo rmance, 16-bit port, (rcd=0, rp=1) or (rcd=1, rp = 0) sdram access number of system clock cycles reg = 0, inv = 0 reg = 1, inv = 0 single-beat read page miss 8 9 page hit 5 6 single-beat longword read page miss 8-1 9-1 page hit 5-1 6-1 single-beat write page miss 6 6 page hit 3 3 single-beat longword write page miss 6-1 6-1 page hit 3-1 3-1 burst read page miss 8-1-1-1-1-1- 1-1 = 15 9-1-1-1-1-1-1-1 = 16 page hit 5-1-1-1-1-1-1-1 = 12 6-1-1-1-1-1-1-1 = 13 burst write page miss 6-1-1-1-1-1- 1-1 = 13 6-1-1-1-1-1-1-1 = 13 page hit 3-1-1-1-1-1-1-1 = 10 3-1-1-1-1-1-1-1 = 10
sdram controller MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 9-12 freescale semiconductor in table 9-13 , the timing configuration is rtp = 61, rc = negligible, rcd = 0, rp = 0, and clt = 1. 9.9 solving timing issues with sdcr[inv] when some sdram devices (such as 4 x 8 bit wide sdrams) are used, the sdclk and other control signals are more loaded than data signals. in normal MCF5272 operation, the wr ite data and all other control signals change with the pos itive edge of sdclk. large capacit ive loads on sdclk can cause long delays on sdclk, possibly causing sd ram hold-time violations during wr ites. the clock may arrive at the same time as the write data. the write data setup time to sdcl k edge may not meet de vice requirements at th e sdram. this timing issue cannot be solved by reducing the sdclk freque ncy. sdclk must be delayed further to meet setup/hold margin on the sdram da ta input. setting inv provides a 180 phase shift and moves the positive clock edge fa r beyond the data edge. figure 9-5. example setup time violat ion on sdram data input during write table 9-13. sdram controller perfo rmance, 16-bit port, (rcd=0, rp=0) sdram access number of system clock cycles reg = 0, inv = 0 reg = 1, inv = 0 single-beat read page miss 7 8 page hit 5 6 single-beat longword read page miss 7-1 8-1 page hit 5-1 6-1 single-beat write page miss 5 5 page hit 3 3 single-beat longword write page miss 5-1 5-1 page hit 3-1 3-1 burst read page miss 7-1-1-1-1-1- 1-1 = 14 8-1-1-1-1-1-1-1 = 15 page hit 5-1-1-1-1-1-1-1 = 12 6-1-1-1-1-1-1-1 = 13 burst write page miss 5-1-1-1-1- 1-1-1 = 12 5-1-1-1-1-1-1-1 = 12 page hit 3-1-1-1-1-1-1-1 = 10 3-1-1-1-1-1-1-1 = 10 external delay of sdclk data setup delay internal clk data bus sdclk
sdram controller MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 9-13 as figure 9-6 shows timing relationships be tween sdclk and the remaining data and control signals can be refined by setting sdcr [inv], which inverts the sdram clock. sdcr[reg] mu st always be cleared when sdcr[inv] is set. . figure 9-6. timing refinement with inverted sdclk note if the delay difference between the fast est data signal and the slowest control signal exceeds half of the clock cy cle time, the clock shift can cause hold-time violations on control signals. the incoming data setup time should be inspected dur ing reads. the active cloc k edge event of sdclk now precedes the MCF5272 internal acti ve clock edge event when (reg = 0). this behavior is frequency dependent. the two followi ng scenarios are possible: ? high-speed timing refinement with true cas latency. see figure 9-7 . ? low-speed timing refinement with reduced effective cas latency. if the delay between shifted sdclk and following internal system cloc k edge is shorter than the read access time of the sdram, data is sampled with the true cas latency. figure 9-7. timing refinement with true cas latency and inverted sdclk shifted delay of sdclk data setup delay internal clk data bus sdclk shifted delay of sdclk delay sdclk to clk sdram read access time t sdclk_to_clk - t acc < 0 => true cas latency casl = 2 internal clk data sdclk
sdram controller MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 9-14 freescale semiconductor selecting a system clock frequency low enough that the sdclk-to-clk delay is long compared to the sdram read access time reduces effective cas latency by 1 cycle. figure 9-8. timing refinement with effective cas latency note when reduced effective cas latenc y is used, the sdram is still programmed with true cas latency. the sdram controller state machine must be reprogrammed fo r the reduced cas latency. sdram initialization software programs the cas latency of 2 and transfers it into the sdram mode register. after sdram initiali zation is confirme d, initialization software should change sdtr[clt] to cas latency 1 but should not reinitialize the sdram. the sdram c ontroller state machine now runs with cas latency 1 and sdrams run with cas la tency 2, which increases bandwidth on the sdram bank and improves performance. 9.10 sdram interface setting csbr n [ebi] to 0b01 enables chip select cs7 for use with one physical bank of sdram. in this case, cs7 becomes sdcs . the sdram memory array may have a 32 - or 16-bit data bus width; an 8-bit width is not supported. an array ma y consist of sdram devices with 8, 16, or 32 bits data bus width. each sdram device can have from 16?256 mbits. the interface to the sdram devices is glueless. the following control signals are dedicated to sdram: sdcs , sdwe , a10_prechg, sdclk, sdclke, ras0 , cas0 , and sdba[1:0]. if sdram ebi mode is used, csor7[waitst] shoul d be programmed for 0x1f to ensure that the internal bus cycle termination signal is sourced fr om the sdram controller a nd not the chip select module. shifted delay of sdclk delay sdclk to clk sdram read access time t sdclk_to_clk - t acc > 0 => effective cas latency reduced by 1 casl = 1 sdclk data internal clk
sdram controller MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 9-15 note the sdram shares address and data signals with external memory and peripherals. due to stringent sdram timing requirements, it is strongly recommended to buffer the address, byt e strobe, and data buses between the MCF5272 and non-sdram memory and pe ripherals. never buffer signals to the sdrams. see appendix c for details on how to buffer external memory and peripherals in a system using sdram. the controller allows single-beat read/wri te accesses and the following burst accesses: ? 16-byte cache line read bursts from 32- bit wide sdram with access times of n -1-1-1. the value of n depends on read, write, page miss, page hit, et c. the enable extended bursts bit in chip select option register 7 (csor7[extburs t]) must be cleare d, csbr7[ebi] must be set for sdram, and csbr7[bw] must be set for a 16-byte cache line width. ? 16-byte cache line read bursts from 16-bi t wide sdram with access times of n -1-1-1-1-1-1-1. csor7[extburst] must be set, csbr7[ebi] mu st be set for sdram, and csbr7[bw] must be set for 16 bits. ? 16-byte read or write bursts dur ing ethernet dma transfers to/f rom sdram with access times of n -1-1-1 or n -1-1-1-1-1-1-1 depending on 32 or 16 bit sdram port width as described in the previous two paragraphs. these sdram accesses are shown in figure 9-9 through figure 9-15 . the sdram supports a low-power, self-refreshing sleep mode as shown in figure 9-14 and figure 9-15 . it is also possible to turn off the sdram controller completely using the power management contro l register in the sim. figures show burst read and burst writes, with a page mi ss and a page hit for each case. a single-cycle read or write is identical to the first access of a burst. in nor mal operation the sdram c ontroller refreshes the sdram. as these examples show, sdclke is normally high and sdclk is always active. sdclke can be forced to 0 and sdclk can be shut off by putting the sdram controller into power dow n or self-refresh mode. 9.10.1 sdram read accesses the read examples, figure 9-9 and figure 9-10 , show a cas latency of 2, sdcr[reg] = 0 and sdcr[inv] = 1. in t1, the coldfire core issues the address. this cycle is internal to the device and always occurs. in t2, the sdram controller determines if there is a page mi ss or hit. this cycle is internal to the device and always occurs. because figure 9-9 shows a page miss, the precharge command (t3) and the following cycle occur. during precharge the sdram writes the designated on-chip ram page buffer back into the sdram array. the number of cycles for a precharge is set by programming sdtr [rp]. the default after reset is two cycles. the activate new page cycl e that follows (t5) is required to open a new page due to the page miss. cycle t6 is a wait st ate for sdram activation co mmand. it is added due to default value of 0b01 in sdtr[rcd]. for lower clock speed systems the rcd value could be wr itten as 00 and this clock cycle can be removed. consult the data sheet s of the sdram devices being used.
sdram controller MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 9-16 freescale semiconductor figure 9-9. sdram burst r ead, 32-bit port, page miss, access = 9-1-1-1 col t0 t1 t2 t3 t4 t5 t6 t7 t8 t9 t10 t11 t12 t13 data data data data row col col col row bank x bank y bank y sdclk sdclke sdadr[13:0] a10_prechg sdba[1:0] sdcs ras0 cas0 sdwe bs [3:0] d[31:0] issue address page hit or miss? precharge old page activate new page cf2 core 1 read 2 read 4 read 3 (7) read casl = 2
sdram controller MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 9-17 figure 9-10 shows a similar burst read th at hits the page. as in the page-miss example, the sdram controller takes a clock cycle (t2) to determine whethe r the access is a hit or a miss. because it is a hit, the burst operation follows immediately. figure 9-10. sdram burst read, 32-bit port, page hit, access = 5-1-1-1 t0 t1 t2 t3 t4 t5 t6 t7 t8 t9 data data data data col col col col bank sdclk sdclke sdadr[13:0] a10_prechg sdba[1:0] sdcs ras0 sdwe bs [3:0] d[31:0] issue address page hit or miss? cf2 core read 1 read 2 read 4 read 3 cas0
sdram controller MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 9-18 freescale semiconductor 9.10.2 sdram write accesses like the read operations, shown in figure 9-9 and figure 9-10 , the write operations require one cycle to issue the address (t1) and another (t2) to determin e whether the access is page hit or miss. in the burst-write, page-miss example, shown in figure 9-11 , after the sdram determines that this is a page miss (t2), the precharge old page (t3) and activate ne w page cycles (t5) are required. cycle t6 is a wait state for sdram activation command as it is in figure 9-9 . figure 9-11. sdram burst write, 32-bit port, page miss, access = 7-1-1-1 t0 t1 t2 t3 t4 t5 t6 t7 t8 t9 t10 t11 data data data data row col col col col row bank x bank y bank y sdclk sdclke sdadr[13:0] a10_prechg sdba[1:0] sdcs ras0 cas0 sdwe bs [3:0] d[31:0] issue address page hit or miss? precharge old page activate new page cf2 core write 1 write 2 write 4 write 3
sdram controller MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 9-19 in the burst-write, page-hit example, shown in figure 9-12 , after the sdram controller determines that the access is a page hit in t2, th e burst transfer begins in t3. figure 9-12. sdram burst write, 32-bit port, page hit, access = 3-1-1-1 t0 t1 t2 t3 t4 t5 t6 t7 t8 data data data data col col col col bank sdclk sdclke sdadr[13:0] a10_prechg sdba[1:0] sdcs ras0 sdwe bs [3:0] d[31:0] issue address page hit or miss? cf2 core write 1 write 2 write 4 write 3 cas0
sdram controller MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 9-20 freescale semiconductor 9.10.3 sdram refresh timing figure 9-13 shows refresh-cy cle timing. as in figure 9-14 , during a precharge all command (t1), the sdram writes all of its on-chip ra m page buffers into the sdram ar ray. sdtr[rp] determines the number of dead cycles after a precharge. note that se lf refresh occurs during t3. in refresh state, sdram cannot accept any other command. figure 9-13. sdram refresh cycle t0 t1 t2 t3 t4 t5 t6 t7 t8 t9 sdclk sdadr[13:0] a10_prechg sdba[1:0] sdcs ras0 sdwe precharge all banks nop auto refresh cas0 sdclke (h) next command t rc
sdram controller MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 9-21 figure 9-14 shows the timing for entering sd ram self-refresh mode. during a precharge all command (t1), the sdram writes all of its on-chip ram page buffers back into the sdram array. the sdtr[rp] value determines the number of dead cycles after a precharge. note that auto refresh occurs in t3. sdtr[rc] determines the number of clock cycles the sdram remains in refresh state, dur ing which time it cannot accept other commands. figure 9-14. enter sdram self-refresh mode t0 t1 t2 t3 t4 t5 t6 t7 t8 t9 t10 t11 t12 t13 internal clock sdclk sdadr[13:0] a10_prechg sdba[1:0] sdcs ras0 sdwe precharge all banks nop self refresh cas0 sdcr[sleep] sdclke
sdram controller MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 9-22 freescale semiconductor figure 9-15 shows the timing for exiting sdram self-refre sh mode. note that sdcr[gsl] is sampled on the rising edge of the internal cl ock. if it is 0, as it is here, sdra m controller signals become active on the following negative clock edge. figure 9-15. exit sdram self-refresh mode t0 t1 t2 t3 t4 t5 t6 t7 t8 internal clock sdclk sdadr[13:0] sdba[1:0] sdcs ras0 sdwe nop cas0 sdcr[gsl] sdclke nop nop nop nop nop nop sdcr[sleep] a10_prechg
MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 10-1 chapter 10 dma controller the MCF5272 has a one-channel dma c ontroller that supports memory-t o-memory dma transfers that can be used for block data moves. this chapter describes in de tail its signals, registers, and operating modes. 10.1 dma data transfer types a source and destination address must be specified for any dual-address dma tr ansfer. these addresses can have different data transfer t ypes, but there is always a read fr om the source address followed by a write to the destination address. on the MCF5272, s ources and destinations can be sdram, external sram, or on-chip peripheral in any combination. note memory-to-memory dma transfers run to completion if the assume request bit in the system configuration regist er, scr[ar], is set. this generally prevents the cpu from recognizing in terrupts and blocks bus accesses by other on-chip bus masters. it is best not to enable scr[ar] when the dma controller is in use. when ar = 0, the dma controller allows the cpu and ethernet controller to obtain bus access. note that transfers to on-chip peri pherals are limited by the transfer type supported by a specific peripheral. table 10-1. dma data transfer matrix transfer type source or destination address sdram external sram on-chip peripheral byte (8 bits) yes yes yes word (16 bits) yes yes yes longword (32 bits) yes yes yes burst (4 x longword) yes no no
dma controller MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 10-2 freescale semiconductor 10.2 dma address modes the dma address mode determines how the address output by the channel is updated after a transfer to be ready for the next transfer. th e two following modes are supported: ? static address mode?the address remains unchang ed after the transfer completes. this mode should be used when the source or destination address is the fifo data port of an on-chip peripheral. ? increment address mode?in increm ent address mode, the address is incremented at the end of the transfer by the number of bytes tr ansferred. this mode should be us ed when a source or destination address is in external memory. 10.3 dma controller registers the MCF5272 dma controller supports a sing le dma channel which can be used for memory-to-memory transfers. 10.3.1 dma mode register (dmr) the dmr controls various operation m odes, principally the request and addressing modes. fields include the transfer size and modifier, transfer direction, channel enable and reset. table 10-2 describes dmr fields. 31 30 29 20 19 18 17 16 field reset en ? rqm ? reset 0000_0000_0000_0000 r/w r/w 15 14 13 12 10 9 8 7 6 5 4 2 1 0 field ? dstm dstt dsts ? ? srcm srct srcs reset 0 01 1_00 01 0 0 1 1_01 01 r/w r/w addr mbar + 0x00e0 figure 10-1. dma mode register (dmr) table 10-2. dmr field descriptions bits name description 31 reset reset. writing a 1 to this location causes the dma c ontroller to reset to a cond ition where no transfers are taking place. en is cleared, preventing new transfers. 30 en enable. controls whether the dma channel is enabled to perform transfers. 0 dma transfers are disabled. 1 dma transfers are enabled. the dma controller can resp ond to requests from the peripheral or generates internal requests in dual address mode, so long as the conditions described under the dma interrupt flags (see section 10.3.2, ?dma interrupt register (dir) ?) do not prevent transfers from going ahead. 29?20 ? reserved, should be cleared.
dma controller MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 10-3 19?18 rqm request mode. determines the request mode of the channel. this must be 11. 00?10 reserved, do not use. 11 dual address request mode. both the dma source and dma destination are memory addresses. the MCF5272 supports only dual-address request mode. 17?15 ? reserved, should be cleared. 14?13 dstm destination addressing mode for the channel. 00 static address mode 01 increment address mode 1x reserved, do not use. 12?10 dstt destination addressing type. used internal to the MCF5272 to qualify the address bits. this value should be compatible with the cscr n [tm] value used for external ram or peripheral device access. 000 reserved 001 user data access 010 user code access 011?100 reserved 101 supervisor data access 110 supervisor code access 111 reserved 9?8 dsts destination data transfer type. the dma controller buffers data from the source address data fetches until there are enough bytes to perform a destination data writ e of the size programmed in these bits. thus it is possible to configure source accesse s to be byte type and destination addresses to be line burst type. in this case 16 individual byte reads are performed followed by an indivisible burst write of four longwords. longword or line bursts are the most efficient data transfers. dsts data transfer type address incremented by 00 longword 4 01 byte 1 10 word 2 11 16-byte line burst 16. valid only for sdram. 7 ? reserved, should be cleared. 6 ? reserved, should be cleared. 5 srcm source addressing mode of the channel. 0 static address mode 1 increment address mode 4?2 srct source addressing type. used internal to the MCF5272 to qualify the address bits. the value should be compatible with the cscr n [tm] value used for external ram or peripheral device access. 000 reserved 001 user data access 010 user code access 011 reserved 100 reserved 101 supervisor data access 110 supervisor code access 111 reserved table 10-2. dmr field descriptions (continued) bits name description
dma controller MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 10-4 freescale semiconductor 10.3.2 dma interrupt register (dir) the dir, figure 10-2 , contains status bits and th eir corresponding interrupt enables. table 10-3 describes dir fields. 1?0 srcs source data transfer type. determines the amount of data the dma controller fetches and buffers data from the source address. when there are enough bytes to perform a destination data write of the size programmed in dsts, the data is written to the destination address. thus source accesses can be longword type and destination addresses can be line burst type. in this case, 4 longword reads are performed followed by an indivisible burst write of 4 longwords. the most efficient data transfer method is to use longword or line burst transfer types. srcs data transfer type address incremented by 00 longword 4 01 byte 1 10 word 2 11 16-byte line burst 16. valid only for sdram. 15 13 12 11 10 9 8 7 5 4 3 2 1 0 field ? inven ascen ? teen tcen ? inv asc ? te tc reset 0000_0000_0000_0000 r/w r/w addr mbar + 0x00e6 figure 10-2. dma interr upt register (dir) table 10-3. dir field descriptions bits name description 15?13 ? reserved, should be cleared. 12 inven invalid combination interrupt enable. 0 inv interrupt is disabled. 1 inv interrupt is enabled. 11 ascen address sequence complete interrupt enable. 0 asc interrupt is disabled. 1 asc interrupt is enabled. 10 ? reserved, should be cleared. 9 teen transfer error interrupt enable. 0 te interrupt is disabled. 1 te interrupt is enabled. 8 tcen transfer complete interrupt enable. 0 tc interrupt is disabled. 1 tc interrupt is enabled. 7?5 ? reserved, should be cleared. table 10-2. dmr field descriptions (continued) bits name description
dma controller MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 10-5 10.3.3 dma source address register (dsar) the dsar provides a 32-bit address, which the dma c ontroller drives onto the internal address bus for all of the channel?s read accesses. the address value is altered after each read access according to the addressing mode. 4 inv invalid combination. 0 no invalid combination detected. 1 an invalid combination of request and address modes is programmed into the mode register. inv remains set until it is cleared by writing a 1 to it or by a hardware reset. writing a 0 has no effect. no further transfers can take place when this bit is set. 3 asc address sequence complete. 0 address sequence is not complete. 1 the address sequence is complete. this occurs wh en the byte counter decrements to 0. corresponds to dma complete. asc remains set until it is cleared by writing a 1 to its location or by a hardware reset. writing a 0 has no effect. no further transfers can take place when asc is set. it is important to ensure that the combination of source address, destinatio n address, and transfer size s ensures that the byte counter always decrements to 0. 2 ? reserved, should be cleared. 1 te transfer error. 0 no transfer error. 1 a dma data transfer terminated with an error such as an internally generated bus error. this generally occurs when the address is not decoded successfully by an on-chip peripheral or by a chip select register. te remains set until it is cleared by writing a 1 to its location or by a hardware reset. writing 0 has no effect. no further transfers can take place when te is set. 0tctransfer complete. 1 a data transfer completed successful. the bit is cleared when dma module is reset. writing a 0 to this location has no effect. this bit is available to show that the dma transfers have started. otherwise it is not essential to monitor the status of this bit. 31 0 field srcadr reset 0000_0000_0000_0000_0000_0000_0000_0000 r/w r/w addr mbar + 0x00ec figure 10-3. dma source address register (dsar) table 10-3. dir field descriptions (continued) bits name description
dma controller MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 10-6 freescale semiconductor 10.3.4 dma destination address register (ddar) the ddar provides a 32-bit address th at the dma controller drives onto the internal address bus for all of the channel?s write accesses. th e address is altered after each writ e access according to the addressing mode. 10.3.5 dma byte count register (dbcr) the dbcr is initially loaded with the number of bytes to be tran sferred during the dma. after each transfer, the dbcr decrements by the number of bytes transferred. dir[asc] is set when the byte counter reaches zero. the user must en sure that the bytes remaini ng to be transferred and th e transfer size are such that the byte counter decrements to zero or wraps around without setting the asc flag. 31 0 field destadr reset 0000_0000_0000_0000_0000_0000_0000_0000 r/w r/w addr mbar + 0x00f0 figure 10-4. dma destination address register (ddar) 31 24 23 0 field ? bytcnt reset r/w r/w 0000_0000_0000_0000_0000_0000_0000_0000 addr mbar + 0x00e8 figure 10-5. dma byte count register (dbcr)
MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 11-1 chapter 11 ethernet module this chapter begins with a feature-set overview, a functional block diagram, and transceiver connection information for both mii and seven-wire serial interfaces. the chapter c oncludes with detailed descriptions of operation and the programming model. 11.1 overview the MCF5272?s integrated fast ethe rnet media access controller (mac ) performs the full set of ieee 802.3/ethernet csma/cd media access c ontrol and channel interface func tions. it requires an external interface adaptor and transc eiver function to complete the interface to the media. 11.1.1 features the fast ethernet controller (fec) incorporates the following features: ? full compliance with the ieee 802.3 standard ? support for three different physical interfaces: ? 100 mbps 802.3 media independent interface (mii) ? 10 mbps 802.3 mii ? 10 mbps seven-wire interface ? half-duplex 100-mbps operation at system clock frequency ? 50 mhz ? 448 bytes total on-chip transmit and receive fifo memory to support a range of bus latencies note: the total fifo size is 448 bytes. it is not intended to hold entire frames but only to compensate for external bus la tency. the fifo can be partit ioned on any 32-bit boundary between receive and transmit, for example, 32 x 56 receive and 32 x 56 transmit. ? retransmission from transmit fifo fo llowing a collision, no processor bus used ? automatic internal flushing of th e receive fifo for runts and coll isions with no processor bus use 11.2 module operation the fec is implemented using a comb ination of hardware and microcode. figure 11-1 shows a functional block diagram of this module.
ethernet module MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 11-2 freescale semiconductor figure 11-1. ethernet block diagram figure 11-2 shows a fast ethernet module. figure 11-2. fast ethernet module block diagram shifter rx receiver control unit fifo shifter tx transmitter control unit fifo slot time clock generator internal clocks control registers txd rxd peripheral bus data data rclk tclk and defer counter rts = tena cd = rena cts = clsn cts = clsn cd = rena reject rstrt random no. dedicated dma/ csrs ram ram i/f fifo descriptor controller mii receive tr a n s m i t bus controller controller e_mdc e_mdio e_rxclk e_rxdv e_rxd[3:0] e_rxer e_txclk e_txen e_txd[3:0] e_txer e_crs,e_col descriptor access internal bus interface
ethernet module MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 11-3 the descriptor controller opens a nd closes the buffer descriptors. th e dma controller manages the data transfer. as soon as the dma channel is initialized, it begins transferring data . an on-board ram acts as both a transmit and receive fifo, and al so provides scratch memory for the fec. the ram is the focal point of all da ta flow in the fec. the ram is di vided into three sections: transmit fifo, receive fifo, and descriptor c ontroller memory. user data flows to or from the dma unit from or to the receive/transmit fifos. transmit data flows from the transmit fifo into the transmit block. receive data flows from the receive block into the receive fifo. the user controls the fec by writing into control registers located in each block. the control and status registers (csrs) provide global cont rol (for example, ethernet reset and enable) and interrupt handling. the mii block provides a serial channe l for the fec and external physical layer device to pass control and status information. the descriptor controller manages da ta flow in both transmit and receive directions. it is programmed with microcode to open and close buffer descriptors, control the transmit collision recovery pr ocess, and filter received frame addresses. the descriptor controller accesses both the transmit and receive descri ptor rings through the descriptor access block. the descriptor acces s block acts as a dedicated single channel dma that either reads a descriptor in external user me mory or writes an updated descri ptor back into user memory. 11.3 transceiver connection the fec supports both an mii interfac e for 10/100 mbps ethernet and a se ven-wire serial interface for 10 mbps ethernet. the interface mode is selected by rcr[mii_mode]. in mii mode, the 802.3 standard defines and the fec module supports 18 signals. these are shown in table 11-1 . table 11-1. mii mode signal description MCF5272 pin transmit clock e_txclk transmit enable e_txen transmit data e_txd[3:0] transmit error e_txer collision e_col carrier sense e_crs receive clock e_rxclk receive enable e_rxdv receive data e_rxd[3:0] receive error e_rxer management channel clock e_mdc management channel serial data e_mdio
ethernet module MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 11-4 freescale semiconductor the serial mode interface operates in what is generally referred to as amd mode. the MCF5272 configuration for seven-wire seri al mode connections to the exte rnal transceiver are shown in table 11-2 . 11.4 fec frame transmission figure 11-3 shows the ethernet frame format. figure 11-3. ethernet frame format the ethernet transmitter is designe d to work with almost no host intervention. as soon as the driver enables the fec transmitter by setting ecr[ether _en] and tdar[24], the fec fetches the first transmit buffer descriptor (txbd). if the user has a frame ready to transmit, dma of the transmit data buffer(s) begins immediately. a coll ision window (512 bits) of transmit data is sent as a dma to the transmit fifo before off- chip transmission begins. when the transmit fifo contains 512 bits of data, the fec asserts e_txen a nd starts transmitting the preamble sequence, the start-of -frame delimiter, and then the frame da ta. however, if the line is busy, the controller defers the transmission (c arrier sense is active). before tr ansmitting, the controller waits for carrier sense to become inactive. when carrier sense goe s inactive, the controller waits to verify that it table 11-2. seven-wire mode configuration signal description MCF5272 pin transmit clock e_txclk transmit enable e_txen transmit data e_txd[0] collision e_col receive clock e_rxclk receive enable e_rxdv receive data e_rxd[0] unused, configure as pb14 e_rxer unused input, tie to ground e_crs unused, configure as pb[13:11] e_rxd[3:1] unused output, ignore e_txer unused, configure as pb[10:8] e_txd[3:1] unused, configure as pb15 e_mdc input after reset, connect to ground e_mdio preamble start frame data delimiter destination address type/ length source address frame check sequence 7 bytes 1 byte 6 bytes 6 bytes 2 bytes 46?1500 bytes 4 bytes stored in receive buffer stored in transmit buffer note: short tx frames are padded automatically by the MCF5272 (pads)
ethernet module MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 11-5 stays inactive for 60 bit times. if so, the transmission begins after wait ing an additional 36 bit times (96 bit times after carrier sense originally went inactive). if a collision occurs during the tr ansmit frame, the fec follows the specified backoff procedures and attempts to retransmit the frame unt il the retry limit is reached. the fe c stores the first 64 bytes of the transmit frame in internal ram, so they need not be retrieved from sy stem memory in case of a collision. this improves external bus use and reduces latency whenever the backof f process results in an immediate retransmission. see figure 11-28 on page 11-37 for the following discu ssion. when the end of the last transmit buffer in the current frame is reached, the 32-bit frame ch eck sum is appended (if txbd[tc] is set) and transmission is disabled (e_txen is negated). following the trans mission of the check sum, the fec writes the frame status bits into th e buffer descriptor and cl ears the ready bit. when the end of the current bd is reached but it is no t the last buffer in the frame, then only the ready bit is cleared. short frames are automatically padded by the transmit logic. if the transmit frame length exceeds the value progr ammed in the maximum frame length register, the babt interrupt is asserted. however, the entire frame is transmitted a nd is not truncated. see section 11.5.14, ?maximum fram e length register (mflr) .? both buffer and frame interrupts may be generated as determined by the eimr register settings. setting the graceful transmit stop bit, tcr[gts], pauses transmission. the fec transmitter stops immediately if no transmission is in progress. otherwise it continues transmission until the current frame finishes normally or term inates with a collision. when tc r[gts] is cleared, the fec resumes transmission with the next frame. the fec transmits bytes lsb first. 11.4.1 fec frame reception the fec receiver is designed to wo rk with almost no intervention from the host and can perform address recognition, crc, short fr ame checking, and maximum frame length checking. when the fec receiver is enabled by setting ecr[ ether_en] and rdar[24] it immediately starts processing receive frames. received frame processi ng proceeds as follows: ? when e_rxdv asserts, the receiver first checks for a valid header comprised of a preamble and start-of-frame delimiter (pa/sdf). ? if the pa/sfd is valid, it is stripped off and th e frame processed further by the receiver. if a valid pa/sfd is not found, the frame is ignored. ? in serial mode, the first 16 bit times of e_ rxd0 following assertion of e_rxdv (rena) are ignored. ? after the first 16 bit times, the data sequence is checked for alternating i/0. ? if a 11 or 00 data sequence is detected during bit times 17 to 21, the remainder of the frame is ignored. ? after bit time 21, the data sequence is monitored for a valid start-of-frame delimiter (sfd) of 11. if a 00 is detected, the frame is rejected. when a 11 is detected, the pa/sfd sequence is complete.
ethernet module MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 11-6 freescale semiconductor ? in mii mode, the receiver checks for at least one byte matching the sfd. zero or more pa bytes may occur, but if a 00 bit sequence is detected before the sfd byte, the frame is ignored. ? after the first 8 bytes of the fr ame have been passed to the receive fifo, the fec performs address recognition on the frame. as soon as a collision window (512 bits ) of data is received, and if addr ess recognition has not rejected the frame, the fec starts transferring the incoming fram e to the receive buffer descriptor?s (rxbd?s) associated data buffer. if the frame is a runt (due to collision) or is rejected by address recognition, no receive buffers are filled. thus, no collision frames are presented to the user except late collisions, which indicate serious lan problems. when the data buf fer has been filled, the fec clears rxbd[e] and generates an rxb interrupt (if rbie n is asserted in eimr register). if the incoming frame exceeds the length of the data buffer, the fec fetches the next rxbd in the table and, if it is empty, continues transferring the rest of the frame to this bd?s associated data buffer. the rxbd length is determined in the r_buff_size value in the emrbr register. the user should program r_buff_size to be at l east 128 bytes. r_buff_size must be quad-word (16-byte) aligned. during reception, the fec checks for a frame that is e ither too short or too l ong. when the frame ends (carrier sense is nega ted), the receive crc field is checked and wr itten to the data buffer. the data length written to the last bd in the ethernet frame is the le ngth of the entire frame. frames shorter than 64 bytes are discarded automatically with no system bus impact. when the receive frame is complete, the fec sets rx bd[l], writes the other frame status bits into the rxbd and clears rxbd[e]. the fec next generate s a maskable interrupt (eir[rfint], maskable by eimr[rfien]), indicating that a fram e has been received and is in memory. the fec then waits for a new frame. the fec receives serial data lsb first. 11.4.2 cam interface in addition to the fec address rec ognition logic, an external cam may be used for frame reject with no additional pins other than those in the mii interface . this cam interface is docum ented in an application note titled ?using freescale ?s fast static ram cams with the mp c860t?s media independent interface,? located at the following url: http://www.freescale.com . 11.4.3 ethernet address recognition the fec filters the received frames based on the type of destination media a ccess controller address (hardware address). there are three destination address (da) types: ? individual (unicast) ? group (multicast) ? broadcast (all-ones group address) the difference between an individual address and a group address is determined by the i/g bit in the destination address field. a flowch art for address recognition on recei ved frames is illustrated in figure 11-4 and summarized in table 11-3 .
ethernet module MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 11-7 . in promiscuous mode (prom = 1 in rcr), the fec receives al l of the incoming frames regardless of their address. in this mode, the des tination address lookup is still pe rformed and rxbd[miss] is set accordingly. if address re cognition did not achieve a match, the fram e is received with rxbd[miss] set. if address recognition achieves a match, the frame is received with out setting rxbd[miss]. figure 11-4. ethernet address recognition flowchart table 11-3. ethernet address recognition destination address type fec address processing individual the fec compares the destination address fiel d of the received frame with the 48-bit mac address programmed into malr and maur. group the fec determines whether or not the group addre ss is a broadcast address. if not broadcast, a hash table lookup is performed using the 64-entry hash table defined in htlr and htur. broadcast the frame is accepted unconditionally. check address receive frame set miss bit i/g address ? receive frame hash match ? receive frame receive frame promiscuous discard frame perfect match ? broadcast address ? g i false tr u e false tr u e false true (rcr[prom] = 1) tr u e false mode ? (rcr[prom] = 0)
ethernet module MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 11-8 freescale semiconductor 11.4.4 hash table algorithm the hash table process used in th e group hash filtering operates as follows. when a frame with the destination address i/g bit set is received by the fe c, the 48-bit destination media access control (mac) address is mapped into one of 64 bi ns, which are represented by 64 bits stored in htlr and htur. this is performed by passing the 48-bit mac address through the on-chip 32- bit crc generator and selecting 6 bits of the crc-encoded result to generate a number betw een 0 and 63. bit 31 of th e crc result selects htur (bit 31 = 1) or htlr (bit 31 = 0). bits 30?26 of the crc result select the bit within the selected register. if the crc generato r selects a bit that is set in the hash ta ble, the frame is accepted; otherwise, it is rejected. the result is that if eight group addr esses are stored in the hash table and random group addresses are received, the hash table prevents roughly 56/64 (or 87.5%) of the group address frames from reaching memory. those that do reac h memory must be further filtered by the processor to determine if they truly contain one of th e eight preferred addresses. the effectiveness of the hash table declin es as the number of addresses increases. the hash table registers must be initialized by th e user. the crc32 polynomial to use in computing the hash is as follows: 11.4.5 interpacket gap time the minimum interpacket gap time for back-to-back transmission is 96 bit times. after completing a transmission or after the backoff al gorithm completes, the transmitter waits for carrier sense to negate before starting its interpacket gap time counter. fr ame transmission may begin 96 bit times after carrier sense is negated if it stays negated for at least 60 bi t times. if carrier sense as serts during the last 36 bit times, it is ignored and a collision will occur. the receiver receives back-to-back frames separated by at least 28 bit time s. if an interpacket gap between receive frames is less than 28 bi t times, the following frame may be discarded by the receiver. 11.4.6 collision handling if a collision occurs during transmission, the fec cont inues transmitting for at least 32 bit times, sending a jam pattern of 32 ones. the jam pattern follows the preamble sequenc e if the collisi on occurs during preamble. if a collision occurs within 64 byte times, the retr y process is initiated. the transmitter waits a random number of slot times. a slot time is 512 bit time s. if a collision occurs after 64 byte times, no retransmission is performed and th e end-of-frame buffer is closed with an lc error indication. 11.4.7 internal and external loopback both internal and external loopback are supported by the fec. in loopback mode, both of the fifos are used and the fec actually operates in a full-duplex fashion. both internal and external loopback are configured using combinations of rcr[loop]. for internal loopback, set loop and clear drt. e_ txen and e_txer cannot assert during internal loopback. for external loopback, clear loop, set drt, and configure the external transceiver for loopback. x 32 x 26 x 23 x 22 x 16 x 12 x 11 x 10 x 8 x 7 x 5 x 4 x 2 x1 + + + + + + + +++++++
ethernet module MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 11-9 11.4.8 ethernet error-handling procedure the fec reports frame reception and transmission erro r conditions through the buffer descriptors and the eir register. 11.4.8.1 transmission errors transmission errors are defined in table 11-4 . 11.4.8.2 reception errors table 11-5 describes reception errors. table 11-4. transmission errors error description tr a n s m i t t e r underrun the fec sends 32 bits that ensure a crc error and st ops transmitting. all remaining buffers for that frame are then flushed and closed, with the un bit set in the last txbd for that frame. the fec continues to the next txbd and begins transmitting the next frame. carrier sense lost during frame transmission when this error occurs and no collision is detected in the frame, the fec sets the csl bit in the last txbd for this frame. the frame is sent normally. no retries ar e performed as a result of this error. the csl bit is not set if tcr[fden] = 1, regardless of the state of crs. retransmission attempts limit expired when this error occurs, the fec terminates transmi ssion. all remaining buffers for that frame are then flushed and closed, with the rl bit set in the last txbd for that frame. the fec then continues to the next txbd and begins sending the next frame. late collision 1 1 the definition of what constitutes a late collision is hard-wired in the fec. the fec stops sending. all remaining buffers for that frame are then flushed and closed, with the lc bit set in the last txbd for that frame. the fec then continue s to the next txbd and begins sending the next frame. heartbeat some transceivers have a self-test feature called heart beat or signal-quality error. to signify a good self-test, the transceiver indicates a collision within 20 clocks a fter the fec sends a frame. this heartbeat condition does not imply a real collision, but that the transceiver seems to be functioning properly. if tcr[hbc] is set and the heartbeat condition is not detected by the fec after a frame transmission, then a heartbeat error occurs. when this error occurs, the fe c closes the buffer, sets the hb bit in the tx bd, and generates the hberr interrupt if it is enabled. table 11-5. reception errors error description overrun error the fec maintains an internal fifo for receiving da ta. if a receiver fifo overrun occurs, the fec closes the buffer and sets rxbd[ov]. non-octet error (dribbling bits) the fec handles up to seven dribbling bits when the receive frame terminates non-octet aligned and it checks the crc of the frame on the last octet boundary. if ther e is a crc error, the frame non-octet aligned (no) error is reported in the rxbd. if there is no crc error, no error is reported. crc error when a crc error occurs with no dribbling bits, the fec closes the buffer and sets rxbd[cr]. crc checking cannot be disabled, but the crc error can be ignored if checking is not required. frame length violation when the receive frame length exceeds r_hash [max_frame_length], eir[babr] is set indicating babbling receive error, and the lg bit in the end of frame rxbd is set. note: receive frames exceeding 2047 bytes are truncated.
ethernet module MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 11-10 freescale semiconductor 11.5 programming model this section gives an overview of the regist ers, followed by a descri ption of the buffers. the fec is programmed by a combination of control/st atus registers (csrs) and buffer descriptors. the csrs are used for mode c ontrol and to extract global status information. the desc riptors are used to pass data buffers and related buffer informa tion between the hardware and software. table 11-6 shows the fec register memory map with each register address, name, and a brief description. the following sections descri be each register in detail. table 11-6. fec register memory map offset name width description 0x840 ecr 32 ethernet control register , [p. 11-11] 0x844 eir 32 interrupt event register , [p. 11-12] 0x848 eimr 32 interrupt mask register , [p. 11-13] 0x84c ivsr 32 interrupt ve ctor status register , [p. 11-14] 0x850 rdar 32 receive descriptor active register , [p. 11-15] 0x854 tdar 32 transmit descriptor active register , [p. 11-16] 0x880 mmfr 32 mii management frame register , [p. 11-17] 0x884 mscr 32 mii speed control register , [p. 11-18] 0x8cc frbr 32 fifo receive bound register , [p. 11-19] 0x8d0 frsr 32 fifo receive start register , [p. 11-20] 0x8ec tfsr 32 fifo transmit start register , [p. 11-22] 0x8e4 tfwr 32 transmit fifo watermark , [p. 11-21] 0x944 rcr 32 receive control register , [p. 11-23] 0x948 mflr 32 maximum frame length register , [p. 11-24] 0x984 tcr 32 transmit control register , [p. 11-25] 0xc00 malr 32 lower 32-bits of mac address 0xc04 maur 32 upper 16-bits of mac address 0xc08 htur 32 upper 32-bits of hash table , [p. 11-28] 0xc0c htlr 32 lower 32-bits of hash table , [p. 11-29] 0xc10 erdsr 32 pointer to receive descriptor ring , [p. 11-30] 0xc14 etdsr 32 pointer to transmit descriptor ring , [p. 11-31] 0xc18 emrbr 32 maximum receive buffer size , [p. 11-32] 0xc40? 0xdff efifo 32 fifo ram space
ethernet module MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 11-11 11.5.1 ethernet control register (ecr) the ecr register, figure 11-5 , is used to enable/disable the fec. it is written by the user and cleared at system reset. 31 26 25 24 16 field ? tx_rt ? reset 0000_0000_0000_0000 r/w read/write 15 21 0 field ? ether_en reset reset 0000_0000_0000_0000 r/w read/write addr mbar + 0x840 figure 11-5. ethernet control register (ecr) table 11-7. ecr field descriptions bits name description 31?26 ? reserved, should be cleared. 25 tx_rt transmit retime. 0 normal operation, seven-wire serial mode. 1 the transmit output signals (e_txd[3:0], e_tx en, and e_txer) are delayed by one-half of a e_txclk period. this bit should be set to provide compatibility with transceivers that have hold time requirements that exce ed the mii specification. 24?2 ? reserved, should be cleared. 1 ether_en ethernet enable. when this bit is set, the fec is enabled, and reception and transmission is possible. when this bit is cleared, reception is immediat ely stopped and transmission is stopped after a bad crc is appended to any frame currently being transmitted. the buffer descriptor(s) for an aborted transmit frame are not updated following deassertion of ether_en. when ether_en is deasserted, the dma, buffer descriptor, and fifo control logic are reset, including fifo pointers. 0 reset ethernet controller re set. when this bit is set, the equivalent of a hardware reset is performed but it is local to the fec. ether_en is cleared and all other fec registers take their reset values. also, any transmission/reception currently in progress is abr uptly aborted. this bit is automatically cleared by hardware once the reset sequence is complete (approximately 16 clock cycles after being set).
ethernet module MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 11-12 freescale semiconductor 11.5.2 interrupt event register (eir) an event that sets a bit in eir generates an interrupt if the corresponding bit in th e interrupt mask register (eimr) is set. bits in the interrupt event register are cleared when a one is written to them. writing a zero has no effect. 31 30 29 28 27 26 25 24 23 22 21 20 16 field hberr babr babt gra txf txb rxf rxb mii eberr umint ? reset 0000_0000_0000_0000 r/w read/write 15 0 field ? reset 0000_0000_0000_0000 r/w read/write addr mbar + 0x844 figure 11-6. interrupt event register (eir) table 11-8. eir field descriptions bits name description 31 hberr heartbeat error. a heartbeat was not detected within the heartbeat window following a transmission. 30 babr babbling receive error. a frame was re ceived with length in excess of max_fl bytes. 29 babt babbling transmit error. the transmitted frame l ength has exceeded max_fl bytes. this condition is usually caused by a frame that is too long being plac ed into the transmit data buffer(s). truncation does not occur. 28 gra graceful stop complete. a graceful stop, which wa s initiated by setting x_ctrl[gts], is now complete. this bit is set as soon as the transmitter has fini shed transmitting any frame that was in progress when gts was set. 27 txf transmit frame interrupt. a frame has been transmitted and that the last corresponding buffer descriptor has been updated. 26 txb transmit buffer interrupt. a transmit buffer descriptor has been updated. 25 rxf receive frame interrupt. a frame has been received and the last corresponding buffer descriptor has been updated. 24 rxb receive buffer interrupt. a receive buffer descriptor has been updated. 23 mii mii interrupt. the mii has co mpleted the data transfer requested. 22 eberr fec bus error. a bus error occurred when the fec was accessing an internal bus. 21 umint unmasked interrupt status. an interrupt is currently being asserted to the interrupt controller. this bit is not maskable. 20?0 ? reserved, should be cleared.
ethernet module MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 11-13 11.5.3 interrupt mask register (eimr) the eimr register provides control over which possible interrupt events are allowed to actually cause an interrupt.this register is cleared upon a hardware reset. 31 30 29 28 27 26 25 24 23 22 21 16 field hberr babr babt gra txf txb rxf rxb mii eberr ? reset 0000_0000_0000_0000 r/w read/write 15 0 field ? reset 0000_0000_0000_0000 r/w read/write addr mbar + 0x848 figure 11-7. interrupt mask register (eimr) table 11-9. eimr register field descriptions bits name description 31?22 see figure 11-7 interrupt mask. each bit corresp onds to an interrupt source defined by the eir register. the corresponding eimr bit determines whether an in terrupt condition can generate an interrupt. at every clock, the eir samples the signal generated by the interrupting source. the corresponding eir bit reflects the state of the interrupt signal even if the corresponding eimr bit is set. 0 the corresponding interrupt source is masked . 1 the corresponding interrupt source is not masked. 21?0 ? reserved, should be cleared.
ethernet module MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 11-14 freescale semiconductor 11.5.4 interrupt vector status register (ivsr) the ivsr register gives status indi cating the class of interrupt being ge nerated by the fec. interrupt level control is provided in the interrupt control registers of the simbc. 31 16 field ? reset 0000_0000_0000_0000 r/w read only 15 43210 field ? ivec ? reset 0000_0000_0000_0000 r/w read only addr mbar + 0x84c figure 11-8. interrupt vector status register (ivsr) table 11-10. ivsr field descriptions bit name description 31?4 ? reserved, should be cleared. 3?2 ivec interrupt vector. ivec gives the highest outstanding priority fec interrupt. the bit field meanings (from low priority to high priority) are as follows: 00 no pending fec interrupt 01 non-time critical interrupt (all interrupts except txb, txf, rxb, and rxf.) 10 transmit interrupt 11 receive interrupt 1?0 ? reserved, should be cleared.
ethernet module MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 11-15 11.5.5 receive descriptor active register (rdar) the rdar register, figure 11-9 , is a command register that should be written by the user to indicate that the receive descriptor ring has been updated (empty r eceive buffers have been pr oduced by the driver with the e bit set). the r_des_active bit is set whenever the register is written. this is independ ent of the data actually written by the user. when set, the fec polls the re ceive descriptor ring and processes receive frames (provided ether_en is also set). as soon as the fec polls a receive descriptor whose e bi t is not set, it clears the r_des_active bit and stops polling the receive descriptor ring. the rdar register is cleared at reset and when eth er_en is cleared. figure 11-9. receive descriptor active register (rdar) table 11-11 describes the rdar fields. 31 25 24 23 16 field ? r_des_active ? reset 0000_0000_0000_0000 r/w read/write 15 0 field ? reset 0000_0000_0000_0000 r/w read/write addr mbar + 0x850 table 11-11. rdar register field descriptions bit name description 31?25 ? reserved, should be cleared. 24 r_des_active set when this register is written, rega rdless of the value written. cleared by the fec whenever no additional empty descriptors remain in the receive ring. 23?0 ? reserved, should be cleared.
ethernet module MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 11-16 freescale semiconductor 11.5.6 transmit descriptor active register (tdar) the tdar register, figure 11-10 , is a command register which should be set by the user to indicate that the transmit descriptor ring has been updated, that is, tr ansmit buffers have been defined by the driver with the ready bit set in the buffer descriptor. the x_des_active bit is set whenever the register is written. this is independ ent of the data actually written by the user. when tdar is set, the fec polls the transmit descriptor ri ng and processes transmit frames (provided ether_en is also set). as soon as the fec polls a transmit descript or whose ready bit is not set, it clears the x_des_active bit and stops polling the transmit descriptor ring. the tdar register is cleared at reset and when ether_en is cleared. figure 11-10 describes this register. table 11-12 describes the tdar fields. 31 25 24 23 16 field ? x_des_active ? reset 0000_0000_0000_0000 r/w read/write 15 0 field ? reset 0000_0000_0000_0000 r/w read/write addr mbar +0x854 figure 11-10. transmit descriptor active register (tdar) table 11-12. tdar field descriptions bits name description 31?25 ? reserved, should be cleared. 24 x_des_active set to one when this register is writt en, regardless of the value written. cleared by the fec whenever no additional ready descriptors remain in the transmit ring. 23?0 ? reserved, should be cleared.
ethernet module MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 11-17 11.5.7 mii management frame register (mmfr) the mmfr register, figure 11-11 , is used to communicate with the attached mii compatible phy device(s), providing read/write access to their mii re gisters. performing a write to the mmfr register causes a management frame to be sourced, unless the mscr register has been programmed to 0. in the case of writing to mmfr when mscr = 0, if the mscr re gister is then written to a non-zero value, an mii frame is generated with the da ta previously written to mmfr. th is allows mmfr and mscr to be programmed in either order if mscr is currently zero. table 11-13 describes the mmfr fields. to perform a read or write operation on the mii mana gement interface, the mmfr register is written by the user. to generate a valid read or write manageme nt frame, the st field mu st be written with a 01 pattern, the op field must be written with a 01 (m anagement register write frame) or 10 (management register read frame), and the ta fiel d must be written with a 10. if other patterns are written to these fields, a frame is generated but will not comply with the ieee 802.3 mii definition. op field = 1x produces a read-frame operation, while op = 0x produces a writ e-frame operation. to generate an 802.3-compliant mii management interfa ce write frame (write to a phy register), the user must write {01 01 phyad regad 10 data} to the mmf r register. writing th is pattern causes the control logic to shift out the data in the mmfr register following a preamble generated by the control state machine. the contents of mmfr are altered as the c ontents are serially shifte d, and are unpredictable if read by the user. once the write management frame ope ration completes, the mii interrupt is generated. at this time, the contents of the mmfr re gister match the original value written. 31 30 29 28 27 23 22 18 17 16 field st op pa ra ta reset undefined r/w read/write 15 0 field data reset undefined r/w read/write addr mbar + 0x880 figure 11-11. mii management frame register (mmfr) table 11-13. mmfr field descriptions bits name description 31?30 st start of frame delimiter. must be progra mmed to 01 for a valid mii management frame 29?28 op operation code. this field must be programmed to 10 (read) or 01(write) to generate a valid mii management frame. a value of 11 produces a read frame operation while a value of 00 produces a write frame operation, but these frames are not mii-compliant. 27?23 pa phy address. specifies one of up to 32 attached phy devices 22?18 ra register address. specifies one of up to 32 registers within the specified phy device 17?16 ta turn around. must be programmed to 10 to generate a valid mii management frame. 15?0 data management frame data. field for data to be written to or read from phy register
ethernet module MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 11-18 freescale semiconductor to generate an mii management in terface read frame (read a phy register), the user must write {01 10 phyad regad 10 xxxx} to mmfr (the contents of the data field are a don?t care). writing this pattern causes the control logic to shift out the data in the mmfr register foll owing a preamble generated by the control state machine.the contents of the mmfr register are altered as the contents are serially shifted, and are unpredictabl e if read by the user. once the read management frame operation completes, the mii interrupt is generate d. at this time the conten ts of the mmfr register matches the original value written except for the data field, whose contents are replaced by the value read from the phy register. if the mmfr register is written wh ile frame generation is in progress, the frame contents are altered. software should use the mii interrupt to avoid writing to the mmfr regi ster while frame generation is in progress. 11.5.8 mii speed control register (mscr) the mscr register, figure 11-12 , provides control of the mii clock (e_mdc pin) frequency, allows dropping the preamble on the mii management fr ame and provides observa bility (intended for manufacturing test) of an internal counter used in generating the e_mdc clock signal. table 11-14 describes the mscr fields. 31 16 field ? reset 0000_0000_0000_0000 r/w read/write 15 8 7 6 1 0 field ? dis_preamble mii_speed ? reset 0000_0000 0 000_000 0 r/w read/write addr mbar + 0x884 figure 11-12. mii speed control register (mscr) table 11-14. mscr field descriptions bits name description 31?8 ? reserved, should be cleared. 7 dis_preamble disable preamble. asserting this bit causes the preamble of 32 consecutive 1?s not to be prepended to the mii management frame. the mii standard allows the preamble to be dropped if the attached phy device(s) do not require it. 6?1 mii_speed mii frequency divider. mii_speed controls the frequency of the mii management interface clock (e_mdc) relative to system clock. a val ue of 0 in this field turns off the e_mdc and leaves it in low-voltage state. any non-zero value results in an e_mdc frequency given by the following formula: mdc_frequency = system fr equency / (4 * mii_speed) 0 ? reserved, should be cleared.
ethernet module MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 11-19 the mii_speed field must be progra mmed with a value to provide an e_mdc frequency of less than or equal to 2.5 mhz to be compliant with the ieee mii specification. the mii_speed must be set to a non-zero value in order to source a read or write ma nagement frame. after th e management frame is complete, the mscr register may opt ionally be set to zero to turn off the e_mdc. the e_mdc generated will have a 50% duty cycle except wh en mii_speed is change d during operation. change will take effect following either a rising or falling edge of e_mdc. if the system clock is 50 mhz, programming this register to 0x0000_000a results in an e_mdc frequency of 25 mhz * 1/10 = 2.5 mhz. table 11-15 shows optimum values for mii_speed as a function of system clock frequency. 11.5.9 fifo receive bound register (frbr) frbr is a read-only register used to determine th e upper address boundary of th e fifo ram. drivers can use this value, along with the registers frsr and tf sr, to appropriately divide the available fifo ram between the transmit and re ceive data paths. the value in this register must be added to mbar + 0x800 to determine the absolute address. table 11-16 describes the frbr fields. table 11-15. programming examples for mscr register system clock frequency [mii_speed] e_mdc frequency 25 mhz 0x3 2.08 mhz 33 mhz 0x4 2.06 mhz 50 mhz 0x5 2.5 mhz 66 mhz 0x7 2.36 mhz 31 16 field ? reset 0000_0000_0000_0000 r/w read only 15 11 10 2 1 0 field ? r_bound ? reset 0000_0 110_0000_00 00 r/w read only addr mbar + 0x884 figure 11-13. fifo receive bound register (frbr) table 11-16. frbr field descriptions bits name description 31?11 ? reserved, should be cleared. 10?2 r_bound end of fifo ram. this field contains the ending address of the fifo ram, exclusive. 1?0 ? reserved, should be cleared.
ethernet module MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 11-20 freescale semiconductor 11.5.10 fifo receive start register (frsr) the frsr register, figure 11-14 , is programmed by the user to indicate the starting address of the receive fifo. frsr marks the boundary between the transmit and receive fifos. the transmit fifo uses addresses from tfsr to frsr - 4. the receive fifo uses addresses from frsr to frbr - 4. the value in this register must be added to mbar + 0x800 to determine the absolute address. frsr needs to be written only to change the default value. table 11-17 describes the frsr fields. 31 16 field ? reset 0000_0000_0000_0000 r/w read/write 15 11 10 9 2 1 0 field ? 1 r_fstart ? reset 0000_0 1 01_0000_00 00 r/w read/write addr mbar + 0x8d0 figure 11-14. fifo receive start register (frsr) table 11-17. frsr field descriptions bits name description 31?11 ? reserved, should be cleared. 10 1 reserved, should be set. 9?2 r_fstart receive fifo starting address. address of fi rst receive fifo location. acts as delimiter between receive and transmit fifos. 1?0 ? reserved, should be cleared.
ethernet module MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 11-21 11.5.11 transmit fifo watermark (tfwr) the tfwr register, shown in figure 11-15 , controls the amount of data required in the transmit fifo before transmission of a fram e can begin. setting tfwr to larger values reduces th e risk of transmit fifo underrun due to system bus latency. table 11-18 describes the tfwr fields. 31 16 field ? reset 0000_0000_0000_0000 r/w read/write 15 210 field ? x_wmrk reset 0000_0000_0000_00 00 r/w read/write addr mbar + 0x8e4 figure 11-15. transmit fifo watermark (tfwr) table 11-18. tfwr field descriptions bits name description 31?2 ? reserved, should be cleared. 1?0 x_wmrk transmit fifo watermark. frame transmission begins when the number of bytes selected by this field are written into the transmit fifo, if an end of frame has been written to the fifo, or if the fifo is full before the selected number of bytes are written. the options are: 0x 64 bytes written to transmit fifo 10 128 bytes written to transmit fifo 11 192 bytes written to transmit fifo
ethernet module MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 11-22 freescale semiconductor 11.5.12 fifo transmit start register (tfsr) the tfsr register, figure 11-16 , can be programmed by the user to i ndicate the starting address of the transmit fifo. usually there is no need to progr am tfsr. for optimal ram allocation, do not program tfsr to a value less than its reset value. the value in this register must be added to mbar + 0x800 to determine the absolute address. the tfsr register is reset to the first available ram address. table 11-19 describes the tfsr fields. 31 16 field ? reset 0000_0000_0000_0000 r/w read/write 15 11 10 9 2 1 0 field ? 1 x_fstart ? reset 0000_0 1 0001_1000 00 r/w read/write addr mbar + 0x8ec figure 11-16. fifo transmit start register (tfsr) table 11-19. tfsr field descriptions bits name description 31?11 ? reserved, should be cleared. 10 ? reserved, should be set. 9?2 x_fstart transmit fifo starting address. address of first transmit fifo location. 1?0 ? reserved, should be cleared.
ethernet module MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 11-23 11.5.13 receive control register (rcr) the rcr register, figure 11-17 , controls the operational m ode of the receive block. table 11-20 describes the rcr fields. 31 16 field ? reset 0000_0000_0000_0000 r/w read/write 15 43 2 10 field ? prom mii_mode drt loop reset 0000_0000_0000_0000 r/w read/write addr mbar + 0x944 figure 11-17. r eceive control register (rcr) table 11-20. rcr field descriptions bits name description 31?4 ? reserved, should be cleared. 3 prom promiscuous mode. all frames are accepted regardless of address matching. 2 mii_mode mii mode enable. selects the external in terface mode. setting this bit to one selects mii mode, setting this bit equal to zero selects seven-wire mode (used only for serial 10 mbps). this bit controls the interface mode for both transmit and receive blocks. 1 drt disable receive on transmit 0 receive path operates independently of transmit (use for full duplex or to monitor transmit activity in half-duplex mode). 1 disable reception of frames while transmi tting (normally used for half-duplex mode). 0 loop internal loopback. if set, transmitted frames are looped back internal to the fec and the transmit output signals are not asserted. the system clock is substituted for the e_txclk when loop is asserted. drt must be set to zero when asserting loop.
ethernet module MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 11-24 freescale semiconductor 11.5.14 maximum frame length register (mflr) as shown in figure 11-18 , the mflr register serves two pur poses. bits 10?0 provide the user r/w max_fl field. the max_fl field allows the user to program the maximum le gal-size frame. frames larger than this size cause the babt interrupt (t ransmit frames) or babr in terrupt and receive buffer descriptor lg bit to be asserted (receive frames). frames exceed ing the max_fl are not truncated. bits 31?24 provide an eight-bit read- only field that provides address recognition information from the receive block about the frame curr ently being received by the fec. table 11-21 describes the mflr fields. 31 30 29 24 23 16 field brdcast multcast hash ? reset 0000_0000_0000_0000 r/w read/write 15 11 10 0 field ? max_fl reset 0000_0 101_1110_1110 r/w read/write addr mbar + 0x948 figure 11-18. maximum frame length register (mflr) table 11-21. mflr field descriptions bits name description 31 brdcast broadcast address received. set if the current receive frame contained a destination address of all ones (the broadcast address). cleared if the current receive frame does not correspond to a broadcast address. 30 multcast multicast address received. set if the curre nt receive frame contained a multi-cast destination address (the least significant bit of the da was set). cleared if the current receive frame does not correspond to a multi-cast address. 29?24 hash current hash value. corresponds to the hash value of the current receive frame?s destination address. the hash value is a 6-bit field extrac ted from the least significant portion of the crc register. 23?11 ? reserved, should be cleared. 10?0 max_fl maximum frame length. length is measured starti ng at da and includes the crc at the end of the frame. transmit frames longer than max_fl caus e the babt interrupt to occur. receive frames longer than max_fl cause the babr interrupt to occur and set the lg bit in the end-of-frame buffer descriptor. frames exceeding the max_fl are not truncated. transmit frames are never truncated, but receive frames are truncated at 2k-1 bytes. the max_fl field resets to 1518 decimal and can be programmed either smaller or larger (up to 2k-1). the recommended default value to be programmed by the user is 1518 or 1522 (if vlan tags are supported).
ethernet module MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 11-25 11.5.15 transmit control register (tcr) the tcr register, figure 11-19 , controls the operational mode of the transmit block table 11-22 describes the tcr fields. 31 16 field ? reset 0000_0000_0000_0000 r/w read/write 15 3210 field ? fden hbc gts reset 0000_0000_0000_0000 r/w read/write addr mbar + 0x984 figure 11-19. transmit control register (tcr) table 11-22. tcr field descriptions bits name description 31?3 ? reserved, should be cleared. 2 fden full duplex enable. if set, frames are transmitted independent of carrier sense and collision inputs. this bit should only be modified when ether_en is deasserted. 1 hbc heartbeat control. if set, the heartbeat check is performed following end of transmission and the hb bit in the status register is set if the collision input does not assert within the heartbeat window. this bit should be modified only when ether_en is deasserted. 0 gts graceful transmit stop. when this bit is set, the mac stops transmission after any current frame is complete and the gra interrupt in the intr_event register is asserted. if frame transmission is not currently underway, the gra interr upt is asserted immediately. once transmission is complete, a restart is accomplished by clearing the gts bit. the ne xt frame in the transmit fifo is then transmitted. if an early collision occurs during transmission when gts = 1, transmission stops after the collision. the frame is transmitted again once gts is cleared. no te that there may be old frames in the transmit fifo that are transmitted when gts is reasserted . to avoid this, deassert ether_en following the gra interrupt.
ethernet module MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 11-26 freescale semiconductor 11.5.16 ram perfect ma tch address low (malr) the malr register contains the lo wer 32 bits of the 48 bi t mac address used in the address recognition process to compare with the destinati on address field of the receive frames. this register, shown in figure 11-20 , is not reset and must be initialized by the user prior to operation. 31 16 field addr_low reset undefined r/w read/write 15 0 field addr_low reset undefined r/w read/write addr mbar + 0xc00 figure 11-20. ram perfect match address low (malr) table 11-23. malr field descriptions bits name description 31?0 addr_low bytes 0 (bits 31?24), 1 (bits 23?16), 2 (b its 15:8), and 3 (bits 7?0) of the 6-byte address.
ethernet module MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 11-27 11.5.16.1 ram perfect ma tch address high (maur) the maur register contains bytes 4 and 5 of the 48-bit mac addre ss used in the address recognition process to compare with the destination address fiel d of the receive frames. by te 0 is the first byte transmitted on the network at the start of the frame. this register is not reset and must be in itialized by the user prior to operation. see figure 11-21 . 31 16 field addr_high reset undefined r/w read/write 15 0 field addr_high reset 0000_0000_0000_0000 r/w read/write addr mbar + 0xc04 figure 11-21. ram perfect match address high (maur) table 11-24. maur field descriptions bits name description 31?0 addr_high bytes 4 (bits 31?24) and 5 (bits 23?16) of the 6-byte address.
ethernet module MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 11-28 freescale semiconductor 11.5.17 hash table high (htur) the htur register, figure 11-22 , contains the upper 32 bits of the 64- bit hash table used in the address recognition process for receive fr ames with a multicast address. this register is not reset and must be initialized by the user prior to operation. 31 16 field hash_high reset undefined r/w read/write 15 0 field hash_high reset undefined r/w read/write addr mbar + 0xc08 figure 11-22. hash table high (htur) table 11-25. htur field descriptions bits name description 31?0 hash_high the htur register contai ns the upper 32 bits of the 64-bit hash table used in the address recognition process for receive frames with a multicast address. bit 31 of htur contains hash index bit 63. bit 0 of htur contains hash index bit 32.
ethernet module MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 11-29 11.5.18 hash table low (htlr) the htlr register, figure 11-23 , contains the lower 32 bits of the 64- bit hash table used in the address recognition process for receive fr ames with a multicast address. this register is not reset and must be initialized by the user prior to operation. 31 16 field hash_low reset undefined r/w read/write 15 0 field hash_low reset undefined r/w read/write addr mbar + 0xc0c figure 11-23. hash table low (htlr) table 11-26. htlr field descriptions bits name description 31?0 hash_low the htlr register cont ains the lower 32 bits of the 64-bit hash table used in the address recognition process for receive frames with a multicast address. bit 31 of htlr contains hash index bit 31. bit 0 of htlr contains hash index bit 0.
ethernet module MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 11-30 freescale semiconductor 11.5.19 pointer-to-receive descriptor ring (erdsr) this register, figure 11-24 , provides a pointer to the start of the ci rcular receive buffer descriptor queue in external memory. this pointer must be long-word aligned. however, it is recommended it be aligned on a 16-byte boundary (address evenly divisible by 16) in order to improve bus utilization. bi ts 1 and 0 should be written to 0 by the user. non-zero values in th ese two bit positions are ignored by the hardware. this register is not reset and must be initialized by the user prior to operation. 31 16 field r_des_start reset undefined r/w read/write 15 210 field r_des_start 0 0 reset undefined r/w read/write addr mbar + 0xc10 figure 11-24. pointer-to-receive descriptor ring (erdsr) table 11-27. erdsr field descriptions bits name description 31?2 r_des_start pointer to start of receive buffer descriptor queue. 1?0 ? reserved, should be cleared.
ethernet module MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 11-31 11.5.20 pointer-to-transmit descriptor ring (etdsr) this register provides a pointer to the start of the circular transmit buffer descript or queue in external memory. this pointer must be long- word aligned. however, it is reco mmended it be a ligned on a 16 byte boundary (address evenly divisible by 16) in order to improve bus utilization. bi ts 1 and 0 should be set to 0 by the user. non-zero values in these tw o bit positions are ignored by the hardware. this register is not reset and must be initialized by the user prior to operation. 31 16 field x_des_start reset undefined r/w read/write 15 210 field x_des_start 0 0 reset undefined r/w read/write addr mbar + 0xc14 figure 11-25. pointer-to-transmit descriptor ring (etdsr) table 11-28. etdsr field descriptions bits name description 31?2 x_des_start pointer to start of transmit buffer descriptor queue. 1?0 ? reserved, should be cleared.
ethernet module MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 11-32 freescale semiconductor 11.5.21 receive buffer size register (emrbr) the emrbr register dictates the maximum size of al l receive buffers. note that because receive frames are truncated at 2k-1 bytes, only bits 10?4 are used. this value should ta ke into consideration that the receive crc is always written into the last receive buffer. to allow one maximum size frame per buffer, r_buff_size must be set to max_fl or larger. th e r_buff_size must be evenly divisible by 16. to insure this, bits 3?0 are forced low. to minimize bus utilization (descriptor fe tches), it is recommended that r_buff_size be at least 256 bytes. this register, figure 11-26 , is not reset and must be initia lized by the user prior to operation. 31 16 field ? reset 0000_0000_0000_0000 r/w read/write 15 11 10 4 3 0 field ? r_buff_size ? reset 0000_0 0000 r/w read/write addr mbar + 0xc18 figure 11-26. receive buffer size (emrbr) table 11-29. emrbr field descriptions bits name description 31?11 ? reserved, should be cleared. 10?4 r_buff_size receive buffer size. 3?0 ? reserved, should be cleared.
ethernet module MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 11-33 11.5.22 initialization sequence this section describes which register s and ram locations are reset due to hardware reset, which are reset due to the fec reset, and what locations the user must initialize before enabling the fec. as soon as the fec is initialized and enabled, it operates autonomously. typically, the driver writes only to rdar, tdar, and eir during operation. 11.5.22.1 hardware initialization in the fec, hardware resets only those registers th at generate interrupts to the MCF5272 processor or cause conflict on bidi rectional buses. the registers are reset due to a hardware reset. other registers reset whenever th e ether_en bit is cleared. cleari ng ether_en immedi ately stops all dma and transmit activity after a bad crc is sent, as shown in table 11-31 11.5.23 user initialization (pri or to asserting ether_en) the user must initialize portions the fec prior to setting the ether_en bit. the exact values depend on the particular application. the sequence is similar to the procedure defined in table 11-32 . table 11-30. hardware initialization user/system register/machine reset value user ecr cleared eir cleared eimr cleared mscr cleared system mii state machine prevent conflict on mmfr table 11-31. ether_en = 0 system/user location effect system dma block all dma activity is terminated xmit block transmission is aborted user rdar cleared tdar cleared table 11-32. user initialization process (before ether_en) step description 1set eimr 2 clear eir 3 set ivsr (define ilevel) 4 set frsr (optional) 5 set tfsr (optional) 6 set maur and malr
ethernet module MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 11-34 freescale semiconductor 11.5.24 fec initialization in the fec, the descriptor control machine initializes a few regi sters whenever the ether_en control is asserted. the transmit and receiv e fifo pointers are reset, the transmit backoff random number is initialized, and the transmit and re ceive blocks are activated. after the fec initialization sequence is complete, the hardware is ready for operation, waiti ng for rdar and tdar to be asserted by the user. 11.5.24.1 user initialization (after setting ether_en) the user initializes portions of the fec after setting ether_en. the exact values depend on the particular application. th e sequence probably resembles the steps shown in table 11-33 , though these could also be done before asserting ether_en. 11.6 buffer descriptors data associated with the fec controller is stored in buffers, which are referenced by buffer descriptors (bds) organized as tables in the dual-port ram. these tables have the same basi c configuration as those used by the usb. the bd table allows users to defi ne separate buffers for transmissi on and reception. each table forms a circular queue, or ring. the fe c uses status and control fields in the bds to inform the core that the buffers have been serviced, to confirm reception and transmission events, or to indicate error conditions. 7 set htur and htlr 8set emrbr 9 set erdsr 10 set etdsr 11 set rcr 12 set tcr 13 set mscr (optional) 14 initialize (empty) txbd 15 initialize (empty) rxbd table 11-33. user initialization (after ether_en) step description 1 fill receive descriptor ring with empty buffers 2set rdar table 11-32. user initialization process (before ether_en) (continued) step description
ethernet module MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 11-35 11.6.1 fec buffer descriptor tables the data for the fast ethernet frames must reside in memory external to the fec. the data for a frame is placed in one or more buffers. each buffer has a pointer to it in a buffer descriptor (bd). in addition to pointing to the buffer, the bd contains the current state of the buffer. to permit maximum user flexibility, the bds are also located in external memory. software defines buffers by allocatin g/initializing memory and initializi ng buffer descriptors. setting the rxbd[e] or txbd[r] produces the buff er. software writing to either td ar or rdar tells the fec that a buffer has been placed in extern al memory for the transmit or rece ive data traffic, respectively. the hardware reads the bds and processes the buffers afte r they have been defined. after the data dma is complete and the bds ha ve been written by the dma engine, rxbd[e] or txbd[r] are cleared by hardware to indicate that the buffer has been proc essed. software may poll the bds to detect when the buffers have been processed or may rely on the buffer/frame interrupts. the ether_en signal operates as a reset to the bd/dma logic. wh en ether_en is negated, the dma engine bd pointers are reset to point to the starting transmit and receive bds. the buffer descriptors are not initialized by hardware during re set. at least one transmit and receive bd must be initialized by software (write 0x0000_0000 to the most significant word of buffer desc riptor) before the ether_en bit is set. the bds are organized in two separa te rings, one for receive buffers an d one for transmit buffers. erdsr defines the starting address of the receive bds and etdsr the same for the transmit bds. the last buffer descriptor in each ring is defined by the wrap (w) bit. when set, w i ndicates that the next descriptor in the ring is at the location pointed to by erdsr and etdsr for the receive and transmit rings, respectively. buffers descriptor rings must start on a double-word boundary. the format of the transmit and recei ve buffer descriptors are given in figure 11-27 and figure 11-28 . 11.6.1.1 ethernet receive bu ffer descriptor (rxbd) in the rxbd, the user initializes the e and w bits in the first word and the pointer in the second word. when the buffer has been sent as a dma, the fec will modify the e, l, m, lg, no, sh, cr, and ov bits and write the length of the used por tion of the buffer in the first word. the m, lg, no, sh, cr, and ov bits in the first word of the buffer descriptor ar e modified by the fec only when the l bit is set. the first word of the rxbd contains control a nd status bits. its form at is detailed below. 1514131211109876543210 +0 e ro1 w ro2 l ? m bc mc lg no sh cr ov tr +2 data length +4 rx data buffer pointer a[31?16] +6 rx data buffer pointer a[15?0] figure 11-27. receive buffer descriptor (rxbd)
ethernet module MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 11-36 freescale semiconductor note anytime the software driver sets an e bit in a receive descriptor, the driver should immediately write to rdar. table 11-34. rxbd field descriptions bits name description 15 e empty. written by the fec (= 0) and user (= 1). 0 the data buffer associated with this bd has been fi lled with received data, or data reception has been aborted due to an error condition. the status and length fields have been updated as required. 1 the data buffer associated with this bd is empty, or reception is currently in progress. 14 ro1 receive software ownership. this field is reserved for use by software. this read/write bit is not modified by hardware, nor does its value affect hardware. 13 w wrap. written by the user. 0 =the next buffer descriptor is found in the consecutive location. 1 =the next buffer descriptor is found at the location defined in erdsr. 12 ro2 receive software ownership. reserved for use by software. this read/write bit is not modified by hardware, nor does its value affect hardware. 11 l last in frame. written by the fec. 0 =the buffer is not the last in a frame. 1 =the buffer is the last in a frame. 10?9 ? reserved, should be cleared. 8 m miss. written by the fec. this bit is set by the fe c for frames that were accepted in promiscuous mode, but were flagged as a miss by the internal address recognition. thus, while in promiscuous mode, the user can use the m-bit to quickly determine whether the frame was destined to this station. valid only if the l-bit and the prom bit are set. 0 the frame was received because of an address recognition hit. 1 the frame was received because of promiscuous mode. 7 bc broadcast. written by the fec. will be se t if da is broadcast. (ff-ff-ff-ff-ff-ff) 6 mc mulitcast. written by the fec. is set if da is multicast and not bc. 5 lg rx frame length violation. written by the fec. a frame length greater than max_fl was recognized. frames exceeding 2047 bytes are truncated to prevent wrapping hardware length counters. valid only if the l-bit is set. 4 no rx non-octet-aligned frame. written by the fec. a fram e that contained a number of bits not divisible by 8 was received, and the crc check that occurred at the preceding byte boundary generated an error. valid only if the l-bit is set. if this bit is set, the cr bit is not set. 3 sh short frame. written by the fec. a frame length that was less than the minimum defined for this channel was recognized. the fec does not support sh and this bit is always cleared. 2 cr rx crc error. written by the fec. contains a crc er ror and is an integral number of octets in length. valid only if the l-bit is set. 1 ov overrun. written by the fec. a receive fifo overrun occurred during frame reception. if this bit is set, the other status bits, m, lg, no, sh, cr, and cl, lo se their normal meaning and are zero. valid only if the l-bit is set. 0 tr truncated receive frame. written by the fec. set if the receive frame is trunc ated. frames greater than or equal to 2048 bytes are truncated. offset + 2 data length written by the fec. data length is the number of octets written by the fec into this bd?s data buffer if l = 0 (the value is equal to emrbr), or the length of the frame including crc if l = 1. it is written by the fec once as the bd is closed. offset + 4 rx buffer pointer written by the user. the receive buffer pointer, whic h always points to the first location of the associated data buffer, must always be evenly divisible by 16. the buffer must reside in memory external to the fec.
ethernet module MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 11-37 11.6.1.2 ethernet transmit buffer descriptor data is presented to the fec for transmission by arrangi ng it in buffers referenced by the channel?s txbds. the fec confirms transmission or indicates error c onditions using the bds to inform the host that the buffers have been serviced. in the txbd, the user initializes the r, w, l, and tc bits and the length (in bytes) in the first word and the buffer pointer in the second words. if l = 0, then the fec sets the r bit to 0 in the firs t word of the bd when the buffer is sent as a dma. status bits are not modified. if l = 1, then the fec sets the r bit to 0 and will modify the def, hb, lc, rl, rc, un, and csl status bits in the first word of the bd after the buffer is sent as a dma, and fram e transmission is complete. the txbd fields are detailed in table 11-35 . 15 14 13 12 11 10 9 8 7 6 5 2 1 0 +0 r to1 w to2 l tc def hb lc rl rc un csl +2 data length +4 tx data buffer pointer a[31?16] +6 tx data buffer pointer a[15?0] figure 11-28. transmit buffer descriptor (txbd) table 11-35. txbd field descriptions bits name description 15 r ready. written by the fec (= 0) and user (= 1). 0 the data buffer associated with this bd is not ready for transmission. the user is free to manipulate this bd or its associated data buffer. the fec clears this bit after the buffer has been transmitted or after an error condition is encountered. 1 the data buffer, which has been prepared for transmission by the user, has not been transmitted or is currently being transmitted. no fields of this bd may be written by the user once this bit is set. 14 to1 transmit software ownership bit.reserved for us e by software. this read/write bit is not modified by hardware, nor does its value affect hardware. 13 w wrap. written by the user. 0 the next buffer descriptor is found in the consecutive location. 1 the next buffer descriptor is found at the location defined in etdsr. 12 to2 transmit software ownership bit. reserved for us e by software. this read/write bit is not modified by hardware, nor does its value affect hardware. 11 l last in frame. written by the user. 0 the buffer is not the last in the transmit frame. 1 the buffer is the last in the transmit frame. 10 tc tx crc. written by the user and is only valid if l = 1. 0 end transmission immediately after the last data byte. 1 transmit the crc sequence after the last data byte. 9 def defer indication. written by the fec and is only valid if l = 1. the fec had to defer while trying to transmit a frame. this bit is not set if a collision occurs during transmission.
ethernet module MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 11-38 freescale semiconductor an underrun occurs when, during transmit, the transmit fifo empties before the end of the frame. then, a bad crc is appended to the partially transmitted data. in addition, the un bit is se t in the last bd for the current frame. this situation can occur if the fec ca nnot access an internal bus, or if the next bd in the frame is not available. note anytime the software driver sets an r bi t in a transmit descriptor, the driver should immediately write to tdar. 8 hb heartbeat error. written by the fec and is valid only if l = 1. the collision input was not asserted within the heartbeat window following the comple tion of transmission. cannot be set unless the hbc bit is set in the tcr register. 7 lc late collision. written by the fec and is only vali d if l = 1. a collision has occurred after 56 data bytes are transmitted. the fec terminates the transmission. 6 rl retransmission limit. written by the fec and is only valid if l = 1. the transmitter has failed retry limit + 1 attempts to successf ully transmit a message due to repeated collisions on the medium. 5?2 rc retry count. written by the fec and is valid only if l = 1. these four bits indicate the number of retries required before this frame is successful ly transmitted. if rc = 0, then the frame was transmitted correctly the first time. if rc = 15, t hen the frame was transmitted successfully while the retry count was at its maximum value. if rl is set, then rc has no meaning. 1 un underrun. written by the fec and is only vali d if l = 1. the fec encou ntered a transmit fifo underrun while transmitting one or more of t he data buffers associated with this frame. when transmit fifo underrun occurs, transmission of the frame stops, and an incorrect crc is appended. the remaining buffer(s) associated with this frame are sent as a dma and dumped by the transmit logic. 0 csl carrier sense lost. written by the fec and is valid only if l = 1. carrier sense dropped out or never asserted during transmission of a frame without collision. - data length written by the user. data le ngth is the number of octets the fe c should transmit from this bd?s data buffer. it is never modified by the fec. bits [10?0] are used by the dma engine; bits [15?11] are ignored. - tx buffer pointer written by the user. the transmit buffer pointer, which contains the address of the associated data buffer, may be even or odd. the buffer must reside in memory external to the fec. this value is never modified by the fec. table 11-35. txbd field descriptions (continued) bits name description
ethernet module MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 11-39 11.7 differences between MCF5272 fec and mpc860t fec the MCF5272 features the same fec as the mpc860t w ith a few differences. the following list pertains to the MCF5272. ? limited throughput full-duplex 100 mbps operati on. external bus use is the limiting factor. ? only big-endian mode is supported for buffer descriptors and buffers. ? separate interrupt vectors for rx, tx and non-time critical interrupts ? interrupt priority is set in the interrupt controller ? the formula for calculating e_mdc clock fr equency differs between MCF5272 and mpc860t: ? MCF5272: e_mdc_frequency= system frequency / (4 * mii_speed) ? mpc860t: e_mdc_frequency= system frequency / (2 * mii_speed) note MCF5272 ethernet controller signal name s are generally identical to those used in the mpc860t, except for a pref ix of ?e_?. for example, mdc in the mpc860t corresponds to e_mdc in the MCF5272.
ethernet module MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 11-40 freescale semiconductor
MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 12-1 chapter 12 universal serial bus (usb) this chapter provides an overview of the usb module of the MCF5272, including detailed operation information and the usb programming model. co nnection examples and circuit board layout considerations are also provided. the usb specification, revision 1.1 is a recommended supplement to th is chapter. it can be downloaded from http://www.usb.org . chapter 2 of this specification, terms and abbreviations , provides definitions of many of the terms found here. note unless otherwise stated, all mention of the usb specification refers to revision 1.1. 12.1 introduction the universal serial bus (usb) is an industry-sta ndard extension to the pc architecture. the usb controller on the MCF5272 supports device mode data communication between itself and a usb host device, typically a pc. one host and up to 127 att ached peripherals share usb bandwidth through a host-scheduled, token-based pr otocol. the usb uses a tier ed star topology with a hub at the center of each star, as shown in figure 12-1 . each wire segment is a point-to -point connection between the host a connector and a peripheral b connector. the usb cables contain four wires, two for data a nd two for power. the usb full-speed bit rate is 12 mbps. a limited-capability, low-spee d mode is also defined at 1.5 mbps. the MCF5272 includes the following features: ? supports full-speed 12-mbps usb de vices and low-speed 1.5-mbps devices ? full compliance with the universal serial bus specification, revision 1.1 ? automatic processing of us b standard device requests: clear _ feature , get _ configuration , get _ descriptor , get _ interface , get _ status , set _ address , set _ configuration , set _ feature , and set _ interface ? supports either internal or external usb transceiver ? programmable 512-byte receive and 512-byte transmit fifo buffers ? usb device controller with pr otocol control and administrati on for up to eight endpoints, 16 interfaces, and 16 configurations ? programmable endpoint types with support for up to eight control, interrupt, bulk, or isochronous endpoints ? independent interrupts for each endpoint
universal serial bus (usb) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 12-2 freescale semiconductor ? supports remote wakeup ? detects start-of-frame and mi ssed start-of-frame for isoc hronous endpoint synchronization ? notification of start-of-frame, reset, suspend, and resume events figure 12-1. the usb ?tiered star? topology 12.2 module operation the MCF5272 usb system consists of a protocol state machine whic h controls the transmitter and receiver modules. the state machine implements only the usb function state diagram. the MCF5272 usb controller can serve as a usb functi on endpoint, but cannot serve as a usb host. 12.2.1 usb module architecture a block diagram of the usb module is shown in figure 12-2 . the module is partitioned into five functional blocks. these blocks are usb internal tran sceiver, clock generator, usb control logic, usb request processor, and endpoint controllers. b a a a a b b a peripheral peripheral peripheral a a hub hub b b b b
universal serial bus (usb) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 12-3 figure 12-2. usb module block diagram 12.2.1.1 usb transce iver interface the usb module supports either an internal or exte rnal usb transceiver. us b_d+ and usb_d- drive usb cable d+ and d- lines, respectively. with additional external protection circuitry (see 12.5.3, ?recommended usb protection circuit ?), equipment can be built that complies with universal serial bus specification , rev. 1.1. transceiver performa nce specifications are descri bed in the chapter 7 of the universal serial bus specification . see note on page , [p. 12-1]. when the internal transceiver is selected, (usbepctl0[afeen] is cl eared), the driven outputs can be observed by using the parallel port a if these pins are configured for usb, using the pacnt register, 17.2.1, ?port a control register (pacnt) ?. the usb module has separate power pi ns for the internal transceiver. note usb_gnd should always be grounded. clock generator usb request processor 512-byte in fifo 512-byte out fifo 1024-byte configuration ram usb_d- usb_d+ usb_vdd usb_gnd usb_tp usb_txen usb_tn usb_rp usb_rn usb_rxd usb_susp system clock internal bus usb control logic usb_extclk endpoint controllers internal transceiver external transceiver interface to u s b cable
universal serial bus (usb) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 12-4 freescale semiconductor however, to reduce power consumpti on, usb_vdd may be left unconnected if either of the following is true: ? the usb module is not used. ? an external transceiver is used. 12.2.1.2 clock generator the usb module requires two clock inputs; the system clock and a 48-mhz data clock. the data clock source is selectable between the us b_extclk pin or the system clock. the clock generator automatically uses the external clock as the data clock if it de tects the presence of a clock signal on the usb_clk pin during system reset. this automa tic selection can be overridden by setting bit usbepctl0[clk_sel], . if a clock signal is not present on usb_clk, the clock generator uses the system clock. note in all cases, the system clock must be at least 24-mhz for the usb module to function properly. if th e system clock is used fo r the usb data clock, the system clock frequency must be 48-mhz. 12.2.1.3 usb control logic the control logic performs the following functions: ? for transmitted data: ? packet creation ? parallel-to-serial conversion ? crc generation ? nrzi encoding ? bit stuffing ? for received data: ? sync detection ? packet identification ? end-of-packet detection ? serial-to-parallel conversion ? crc validation ? nrzi decoding ? bit unstuffing ? for error detection: ? bad crc ? timeout waiting for end-of-packet ? bit stuffing violations
universal serial bus (usb) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 12-5 12.2.1.4 endpoint controllers the MCF5272 has eight independent e ndpoint controllers that manage da ta transfer between the on-chip cpu and the usb host for each endpoint . these controllers provide event notification to the user and manage the in and out fifo dual-port ram buffers. the usb endpoint configurat ion registers (usbepocfg n or usbepicfg n ) are used to configure each endpoint to support either control, interrupt, bulk, or isochronous transfers. usb always uses endpoint 0 as a control pipe, so it must be configured fo r control transfer mode. additional control pipes can be provided by other endpoints. a total of 1024 bytes of dual-port ra m are available for tran smit and receive fifo buffers. this ram is partitioned to provide 512 bytes for each direction. the user is respons ible for configuring the fifo for each endpoint. this configur ation is flexible within the following constraints: ? fifo size must be an integral power of 2 ? fifo size must be at least twice the maximum packet size ? fifo starting address must be aligned on a boundary defined by the fifo size. for example, an endpoint with a ma ximum packet size of 32 bytes can have a fifo size of 64, 128, or 256 bytes and a starting addr ess of 0, 64, 128, 192, 256, etc. 12.2.1.5 usb request processor the MCF5272 usb request processor au tomatically processes all of the usb standard requests listed in table 12-1 except for sync _ frame and the optional set _ descriptor request. the sync _ frame request is passed to the user as a vendor-s pecific request. the usb module responds with a request error when the set _ descriptor request is issued. these standard re quests are defined in chapter 9 of the usb specification. see beginning of page 12-1. table 12-1. usb device requests device request usb request processor action clear_feature request processor clears the feature specified by the feature selector parameter. currently, remote wakeup and endpoint halt are the on ly features defined by the usb spec ification. if the feature to be cleared is remote wakeup, the usb block disables the remote wakeup functionality. if the feature to be cleared is endpoint halt, the request processor acti vates the selected endpoint. the user is notified when the remote wakeup is disabled or an endpoint halt is cleared. get_configuration returns the current co nfiguration as set by a previous set _ configuration request. no user notification is provided. no user action required. get_descriptor reads the specified device or configuration descriptor from the c onfiguration ram and transfers it to the host. requests for a configuration descriptor retu rns all of the descriptors associated with a given configuration including interface, endpoint, and cla ss-specific descriptors. this request fails if the configuration ram has not been initialized. no user notification is provided. the optional requests for string de scriptors are not handled automati cally by the request processor. get _ descriptor requests for string descriptors are passed to the user as a vendor specific request. the string descriptors must be stored in external memory and not the configuration ram. get_interface returns the selected alternate setting for the specified interface. no user notification is provided.
universal serial bus (usb) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 12-6 freescale semiconductor get_status returns the current status of the specified device, endpoint or interface. no user notification is provided, no user action required. set_address loads the specified address into usbfar. the control logic begins responding to the new address once the status stage of the request completes succ essfully. no user notification is provided unless debug mode is enabled. set_configuration reads the configurati on ram. if the configuration is clear ed, the usb module is placed into the unconfigured state. if a valid configuration is selected, the appropriate endpoint controllers are activated. an invalid configuration number or e rror in the configuration descriptor causes the usb module to return a stall response to the host. the user is notified when this request completes successfully and must initialize the active endpoint controllers. set_descriptor not supported. returns request error. set_feature sets the specified feature. remote wakeup an d endpoint halt are the only features defined in the usb specification, revision 1.0. if the specified featur e is remote wakeup, the usb enables the remote wakeup functionality. if the spec ified feature is endpoint halt, the usb request processor halts the selected endpoint. a halted endpoint returns a stall response to any requests. set_interface allows the host to select an alternate setting for the specified interface. if a valid alternate setting is selected, the appropriate endpoint controllers are activated. the user is notified upon successful completion of this request and must reinitialize the affected endpoint controllers. note: the user must read the de scriptor structure to determine which endpoints correspond to a given interface. sync_frame passed to the user as a vendor specific request. table 12-1. usb device requests (continued) device request usb request processor action
universal serial bus (usb) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 12-7 12.3 register description and programming model this section contains a deta iled description of each regist er and its specific function. 12.3.1 usb memory map the operation of the usb is controlled by writing control bytes into the appropriate registers. table 12-2 is a memory map for usb registers. all of the regist ers are longword aligned ev en though they are not all 32 bits wide. table 12-2. usb memory map offset [31:24] [23:16] [15:8] [7:0] 0x1000 reserved usb frame number register (fnr) 0x1004 reserved usb frame number match register (fnmr) 0x1008 reserved usb real-time frame monitor register (rfmr) 0x100c reserved usb real-time frame monitor match register (rfmmr) 0x1010 reserved usb function address register (far) 0x1014 usb alternate setting register (asr) 0x1018 usb device request data1 register (drr1) 0x101c usb device request data2 register (drr2) 0x1020 reserved usb specification number register (specr) 0x1024 reserved usb endpoint 0 status register (ep0sr) 0x1028 usb endpoint 0 in config register (iep0cfg) 0x102c usb endpoint 0 out config register (oep0cfg) 0x1030 usb endpoint 1 configuration register (ep1cfg) 0x1034 usb endpoint 2 configuration register (ep2cfg) 0x1038 usb endpoint 3 configuration register (ep3cfg) 0x103c usb endpoint 4 configuration register (ep4cfg) 0x1040 usb endpoint 5 configuration register (ep5cfg) 0x1044 usb endpoint 6 configuration register (ep6cfg) 0x1048 usb endpoint 7 configuration register (ep7cfg) 0x104c usb endpoint 0 cont rol register (ep0ctl) 0x1050 reserved usb endpoint 1 control register (ep1ctl) 0x1054 reserved usb endpoint 2 control register (ep2ctl) 0x1058 reserved usb endpoint 3 control register (ep3ctl) 0x105c reserved usb endpoint 4 control register (ep4ctl) 0x1060 reserved usb endpoint 5 control register (ep5ctl) 0x1064 reserved usb endpoint 6 control register (ep6ctl) 0x1068 reserved usb endpoint 7 control register (ep7ctl)
universal serial bus (usb) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 12-8 freescale semiconductor 0x106c usb general/endpoint 0 interrupt status register (ep0isr) 0x1070 reserved usb endpoint 1 interrupt status register (ep1isr) 0x1074 reserved usb endpoint 2 interrupt status register (ep2isr) 0x1078 reserved usb endpoint 3 interrupt status register (ep3isr) 0x107c reserved usb endpoint 4 interrupt status register (ep4isr) 0x1080 reserved usb endpoint 5 interrupt status register (ep5isr) 0x1084 reserved usb endpoint 6 interrupt status register (ep6isr) 0x1088 reserved usb endpoint 7 interrupt status register (ep7isr) 0x108c usb endpoint 0 interrupt mask register (ep0imr) 0x1090 reserved usb endpoint 1 interrupt mask register (ep1imr) 0x1094 reserved usb endpoint 2 interrupt mask register (ep2imr) 0x1098 reserved usb endpoint 3 interrupt mask register (ep3imr) 0x109c reserved usb endpoint 4 interrupt mask register (ep4imr) 0x10a0 reserved usb endpoint 5 in terrupt mask register (ep5imr) 0x10a4 reserved usb endpoint 6 in terrupt mask register (ep6imr) 0x10a8 reserved usb endpoint 7 in terrupt mask register (ep7imr) 0x10ac usb endpoint 0 data register (ep0dr) 0x10b0 usb endpoint 1 data register (ep1dr) 0x10b4 usb endpoint 2 data register (ep2dr) 0x10b8 usb endpoint 3 data register (ep3dr) 0x10bc usb endpoint 4 data register (ep4dr) 0x10c0 usb endpoint 5 data register (ep5dr) 0x10c4 usb endpoint 6 data register (ep6dr) 0x10c8 usb endpoint 7 data register (ep7dr) 0x10cc reserved usb endpoint 0 data present register (ep0dpr) 0x10d0 reserved usb endpoint 1 data present register (ep1dpr) 0x10d4 reserved usb endpoint 2 data present register (ep2dpr) 0x10d8 reserved usb endpoint 3 data present register (ep3dpr) 0x10dc reserved usb endpoint 4 data present register (ep4dpr) 0x10e0 reserved usb endpoint 5 data present register (ep5dpr) 0x10e4 reserved usb endpoint 6 data present register (ep6dpr) 0x10e8 reserved usb endpoint 7 data present register (ep7dpr) 0x1400 ? 0x17ff usb configuration ram, 1 k bytes table 12-2. usb memory map (continued) offset [31:24] [23:16] [15:8] [7:0]
universal serial bus (usb) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 12-9 12.3.2 register descriptions the following are detailed register diagrams and field descriptions. 12.3.2.1 usb frame number register (fnr) once every 1 ms, the usb host issues a start-of-frame packet containing a frame number. the fnr register captures this frame number. figure 12-3 shows the fnr. figure 12-3. usb frame number register (fnr) table 12-3 describes fnr fields. 12.3.2.2 usb frame number match register (fnmr) fnmr is used to signal, via the frm_mat interrupt, when a particul ar frame number is issued by the usb host. to avoid a false match during intermediate st ates of a byte write operation to the fnmr, figure 12-4 , byte accesses to this register are not supported and cause an access error. figure 12-4. usb frame number match register (fnmr) table 12-4 describes fnmr fields. 15 11 10 0 field ? frm reset 0000_0000_0000_0000 r/w read addr mbar + 0x1002 table 12-3. fnr field descriptions bits name description 15?11 ? reserved, should be cleared. 10?0 frm usb frame number. contains the current usb fram e number. frm is updated with the new frame number each time the device successf ully receives a start-of-frame (sof) pa cket from the usb host. the new frame number is contained in the sof packet. 15 11 10 0 field ? frm_mat reset 0000_0000_0000_0000 r/w r/w addr mbar + 0x1006 table 12-4. fnmr field descriptions bits name description 15?11 ? reserved, should be cleared 10?0 frm_mat frame number match value. contains the u sb frame number match value. when the fnr value equals the value in the register, a frm_mat interrupt is generated.
universal serial bus (usb) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 12-10 freescale semiconductor 12.3.2.3 usb real-time fram e monitor register (rfmr) the value in the rfmr can be used to determine a pproximately how much time has elapsed since the usb host sent its last st art-of-frame packet. because the hardware does not guaran tee that any of the bi t values are stable during the read access: ? only the higher-order bits should be used ? the returned data should always be de-glitched by verifying that the same value is seen on the higher-order bits for two consecutive read cycles. figure 12-5 shows the usb real-time frame monitor register. figure 12-5. usb real-time frame monitor register (rfmr) table 12-5 lists field descriptions for the us b real-time frame monitor register. 15 14 13 0 field ? rtfm reset 0000_0000_0000_0000 r/w read addr mbar + 0x100a table 12-5. rfmr field descriptions bits name description 15?14 ? reserved, should be cleared. 13?0 rtfm real-time frame count. contains the current usb frame counter value. the c ounter is incremented one time for every usb bit time and is reset when a sof packet from the host is detected or an artificial start of frame (asof) interrupt is generated.
universal serial bus (usb) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 12-11 12.3.2.4 usb real-time frame monitor match register (rfmmr) to avoid intermediate false values in th e real-time frame monitor match register, figure 12-6 , byte accesses are not supported a nd cause an access error. figure 12-6. usb real-time frame monitor match register (rfmmr) table 12-6 lists field descriptions for the usb real-time frame monitor match register. 12.3.2.5 usb function address register (far) figure 12-7 shows the usb function address register (far). if ep0ctl[debug] is set, ep0ctl[dev_cfg] also reflects an y change in far. if debug is zero, the MCF5272 usb controller is not notified if the function address cha nges. this value is for information only. figure 12-7. usb function address register (far) table 12-7 gives the usb function address register field descriptions. 15 14 13 0 field ? rtfm_mat reset 0011_1111_1111_1111 r/w r/w addr mbar + 0x100e table 12-6. rfmmr field descriptions bits name description 15?14 ? reserved, should be cleared 13?0 rtfm_mat real-time frame monitor ma tch. contains the real-time frame monitor match value. when the rfmr value equals the value in the register, an asof interrupt is generated. the value programmed in this register should not be less than 0x2ee0--the nominal period between sof packets. 76 0 field ? fad reset 0000_0000 r/w read addr mbar + 0x1013 table 12-7. far field descriptions bits name description 7 ? reserved, should be cleared 6?0 fad usb function address. this field holds the usb add ress of the device. the usb module writes this field with the usb address assigned to the device with a set_address device request.
universal serial bus (usb) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 12-12 freescale semiconductor 12.3.2.6 usb alternate settings register (asr) defines which of several possible interfaces is currently active. figure 12-8 shows the usb alternate settings register. the configuration de scriptors must be read by the user in order to determine which interfaces are currently valid. figure 12-8. usb alternate settings register (asr) table 12-8 lists field descriptions for the usb alternate settings register. 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 field if15_as if14_as if13_as if12_as if11_as if10_as if9_as if8_as reset 0000_0000_0000_0000 r/w read 1514131211109876543210 field if7_as if6_as if5_as if4_a s if3_as if2_as if1_as if0_as reset 0000_0000_0000_0000 r/w read addr mbar + 0x1014 table 12-8. asr field descriptions bits name description 31?0 ifn_as usb alternate settings for interface n . this field indicates which alternate setting is active for each interface. 00 alternate setting 0 01 alternate setting 1 10 alternate setting 2 11 alternate setting 3
universal serial bus (usb) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 12-13 12.3.2.7 usb device request data 1 and 2 registers (drr1/ 2) the device request data registers, figure 12-9 and figure 12-10 , are used to notify the user that an optional standard, class-specific, or vendor-s pecific request has been received and to pass the request type and parameters to the application. the fields in d rr1 and drr2 are defined in chapter 9 of the usb specification . see top of page, [p. 12-1]. figure 12-9. usb device reque st data 1 register (drr1) figure 12-10. usb device request data 2 register (drr2) 31 16 field wvalue reset 0000_0000_0000_0000 r/w read 15 8 7 0 field brequest bmrequesttype reset 0000_0000_0000_0000 r/w read addr mbar + 0x1018 31 16 field wlength reset 0000_0000_0000_0000 r/w read 15 0 field windex reset 0000_0000_0000_0000 r/w read addr mbar + 0x101c
universal serial bus (usb) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 12-14 freescale semiconductor 12.3.2.8 usb specification number register (specr) figure 12-11 shows the usb specification number register. table 12-9 lists field descriptions for the usb specification number register. 12.3.2.9 usb endpoint 0 status register (ep0sr) figure 12-12 shows the usb endpoint 0 status regi ster. only written via the standard set_configuration request by the host. table 12-10 lists field descriptions the usb endpoint 0 status register. 15 43 0 field spec mrn reset 0001_0001_0000_0001 r/w read addr mbar + 0x1022 figure 12-11. usb specificat ion number register (specr) table 12-9. specr field descriptions bits name descriptions 15?4 spec usb specification release number. this field identif ies the release of the usb s pecification that the device complies with. the usb specification release number is in binary-coded decimal (bcd) format. 3?0 mrn module revision number. 15 12 11 10 3 2 1 0 field config wake_st ? halt_st dir ? reset 0000_0000_0000_0001 r/w read addr mbar + 0x1026 figure 12-12. usb endpoint 0 status register (ep0sr) table 12-10. ep0sr field descriptions bits name descriptions 15?12 config current configuration number. indicate s which configuration is active. receiving a set_configuration usb standard device reque st sets the active configuration. a configuration setting of 0 means that the de vice is unconfigured. valid only when episr0[dev_cfg] is set 11 wake_st remote wakeup status. indicates whether the usb module has been enabled to generate remote wakeup resume signaling. 1 enabled. the usb host has issued the set_fea ture request with the remote wakeup feature selector set. 0 disabled. the usb host has issued the cl ear_feature request with the remote wakeup feature selector set, or has not set this fe ature since a usb or system reset has occurred. 10?3 ? reserved, should be cleared.
universal serial bus (usb) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 12-15 12.3.2.10 usb endpoint 0 in configuration register (iep0cfg) figure 12-13 shows the usb endpoint 0 in c onfiguration (iep0cfg) register. table 12-11 lists field descriptions for the iep0cfg register. only l ongword writes are allowed. the maximum packet size for endpoint 0 is eight bytes. writing to the register resets the fifo. any data in the fifo are discarded, and the associated ep n dp register is also reset. 2 halt_st current endpoint 0 halt status. indicates whet her endpoint 0 is currently halted or active. endpoint 0 is halted if there is an error processing a request. a halt is cleared automatically by a setup packet. 1 endpoint 0 halted 0 endpoint 0 active 1 dir current endpoint 0 direction. indicates whether endpoint 0 is currently accessed as an in or out endpoint. 1 the endpoint is configured as an in endpoint 0 the endpoint is configured as an out endpoint 0 ? reserved, should be cleared. 31 22 21 20 16 field max_packet ? fifo_size reset 0000_0000_0000_0000 r/w r/w 15 11 10 9 0 field fifo_size ? fifo_addr reset 0000_0000_0000_0000 r/w r/w addr mbar + 0x1028 figure 12-13. usb endpoint 0 in c onfiguration register (iep0cfg) table 12-11. iep0cfg field descriptions bits name descriptions 31?22 max_packet maximum packet size. must be written with the maximum packet size defined in the device descriptor for endpoint 0 or the endpoint descriptors for other endpoints. 21 ? reserved, should be cleared. 20?11 fifo_size size of the fifo. sets the depth of the fifo buffer for the endpo int. the fifo size must be a power of 2. for non-isochronous endpoints, the fifo size must be at least two times the maximum packet size. 10 ? reserved, should be cleared. 9?0 fifo_addr starting address in the fifo buffer memory for the endpoint?s fifo. reading this field returns the current write pointer for in endpoints or the read pointer for out endpoints for the fifo. table 12-10. ep0sr field descriptions bits name descriptions
universal serial bus (usb) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 12-16 freescale semiconductor 12.3.2.11 usb endpoint 0 out conf iguration register (oep0cfg) figure 12-14 shows the usb endpoint 0 ou t configuration register. see table 12-11 for a description of the fields. 12.3.2.12 usb endpoint 1?7 configuration register (ep n cfg) figure 12-15 shows the usb endpoint 1 ?7 configuration register. see table 12-11 for a description of the fields. 31 22 21 20 16 field max_packet ? fifo_size reset 0000_0000_0000_0000 r/w r/w 15 11 10 9 0 field fifo_size ? fifo_addr reset 0000_0000_0000_0000 r/w r/w addr mbar + 0x102c figure 12-14. usb endpoint 0 out configuration register 31 22 21 20 16 field max_packet ? fifo_size reset 0000_0000_0000_0000 r/w r/w 15 10 9 0 field fifo_size ? fifo_addr reset 0000_0000_0000_0000 r/w r/w addr mbar + 0x1030, 0x1034, 0x103 8, 0x103c, 0x1040, 0x1044, 0x1048 figure 12-15. usb endpoint 1?7 configuration register
universal serial bus (usb) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 12-17 12.3.2.13 usb endpoint 0 c ontrol register (ep0ctl) figure 12-16 shows the usb endpoint 0 control register . provides both module level and endpoint 0 specific control (bits 0-9) functions. table 12-12 lists field descriptions for th e usb endpoint 0 control register. 31 23 field ? reset 0000_0000 r/w r/w 22 19 18 17 16 field ? debug wor_lvl wor_en reset 0000_0000 r/w r/w 15 14 13 12 11 10 9 8 field clk_sel resume afe_en bus_pwr u sb_en cfg_ram_val cmd_err cmd_over reset 0000_0000 r/w r/w 765432 10 field crc_err ? out_lvl in_lvl in_done ? reset 0000_0000 r/w r/w addr mbar + 0x104c figure 12-16. usb endpoint 0 control register (ep0ctl) table 12-12. ep0ctl field descriptions bits name description 31?19 ? reserved, should be cleared. 18 debug debug mode. enters debug mode. debug mode enables crc error generation and notification of a change of address. 0 normal operation 1 enable debug mode functions 17 wor_lvl wake-on-ring level select. selects the active level of int1 for the wake-on-ring function. 0 wake-on-ring function is invoked when int1 pin is 0. 1 wake-on-ring function is invoked when int1 pin is 1. 16 wor_en wake-on-ring enable. generates a resume when the active level is detected on int1 pin. 0 wake-on-ring function disabled 1 wake-on-ring function enabled note: the wake-on-ring function generates a resume only if the usb module is enabled for remote wakeup by the host, for example, wake_st = 1, and is suspended. 15 clk_sel clock source selection. overrides the clock s ource for the usb module. if the usb_extclk pin is selected after reset, se tting this bit forces the usb module to use the internal system clock. 0 clock is retrieved from the clock selected at reset. 1 clock is retrieved from the internal system clock. note: the selected clock must have a frequency of 48 mhz.
universal serial bus (usb) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 12-18 freescale semiconductor 14 resume generates resume condition. used to exit the suspend state. the usb control logic ensures the forced resume duration is greater than 10 ms. this command bit is write-only and always returns 0 when read. 0default 1 generate resume condition (force data lines to k state) note: this command generates a resume only if the usb is both suspended and enabled for remote wakeup by the host, that is, usbepsr0[wake_st] = 1. 13 afe_en external usb analog front-end enable. used to select the internal or external usb analog front end (afe). the internal afe is selected by default. 0 the usb internal afe is powered up and the external transceiver interface is disabled. the driven outputs can be observed on the parallel port a signals if they are configured for usb. 1 the usb internal afe is powered down and the external transceiver interface is enabled. the internal transceiver outputs, (usbh and usbl), are high impedance. 12 bus_pwr select bus-powered mode. used to select between bus-powered and self-powered mode. this bit only affects the response to a get_status device request. this bit should be set according to the current configuration. 0 self-powered mode 1 bus-powered mode 11 usb_en enables and disables the usb control logic. ha s no effect on usb register values. when cleared, the outputs are high impedance, preventing any respon se to the host. this bi t should be set after usb module registers are initialized and the desc riptors are copied into the configuration ram. 0 disable usb module 1 enable usb module 10 cfg_ram_val enable usb configurat ion ram. notifies the usb modul e that the user has loaded the configuration ram. must be set in order for th e usb module to process the usb standard device requests that access the configur ation ram. these requests are get _ descriptor , set _ configuration , and set _ interface . when this bit is set, accesses to the configuration ram cause an access error. 0 configuration ram invalid 1 configuration ram valid 9 cmd_err command error for device request interface. used to indicate to the endpoint controller that an error has been encountered during class or ven dor specific device request or synch_frame command processing. this command bit is write only and always returns 0 when read. result of requestcmd_overcmd_err processed device request successfully10 error processing the request11 busy processing the request0x note: cmd_over and cmd_err have to be written simultaneously. the cmd_over and cmd_err bits control the status stage respons e for vendor and class specific requests. 8 cmd_over command over for device request interface. used to indicate to the endpoint controller that processing of a class or vendor specific de vice request or synch_frame command has been completed by the user. this command bit is write only and always returns 0 when read. note: cmd_over and cmd_err have to be written simultaneously. the cmd_over and cmd_err bits control the status stage respons e for vendor and class specific requests. table 12-12. ep0ctl field de scriptions (continued) bits name description
universal serial bus (usb) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 12-19 7 crc_err crc error generation enable. this bit enables crc error generation for debug and test purpose. in order to use this feature, the debug bit must be set. enabling this bit causes a crc error on the next data packet transmitted. the crc_err bit must be set again in order to generate another crc error. this bit only applies to in transfers. this command bit is write-only and always returns 0 when read. 1 crc error generation if debug = 1 0 default value 6 ? reserved, should be cleared. 5?4 out_lvl endpoint 0 out fifo level for interrupt. this field selects the fifo level to generate an out_lvl interrupt. the out_lvl interrupt is generated when the fifo fills above the selected level. 00 fifo 25% full 01 fifo 50% full 10 fifo 75% full 11 fifo 100% full 3?2 in_lvl endpoint 0 in fifo level for interrupt. this field selects the fifo level to generate an in_lvl interrupt. the in_lvl interrupt is generat ed when the fifo falls below the selected level. 00 fifo 25% empty 01 fifo 50% empty 10 fifo 75% empty 11 fifo 100% empty 1 in_done this bit controls the usb's response to in toke ns from the host. this bit is set at reset and must be cleared by software when the last byte of a tran sfer has been written to the in-fifo. this bit is then subsequently set by the usb core when an end of transfer (eot) event occurs indicating that the transfer has been completed. an end of tran sfer (eot) event is indicated by one of the following: a) an in packet is transmitted that contains le ss than the maximum number of bytes defined at endpoint configuration. b) a zero length in packet is transmitted. this occurs when the previously transmitted in packet was full, and no more data remains in the in-fifo. hence a single zero length packet must be sent to indicate eot. 0 cpu has completed writing to the in-fifo and transfer is in progress. the usb module will send any amount of data in the fifo or a zero-length packet when the fifo is empty. 1 transfer completed or cpu busy writing transfer into the in-fifo. the usb module will only send maximum size packets or nak responses if the fifo contains less than a maximum size packet. this bit is set at reset and on an eot event. 0 ? reserved, should be cleared. table 12-12. ep0ctl field de scriptions (continued) bits name description
universal serial bus (usb) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 12-20 freescale semiconductor 12.3.2.14 usb endpoint 1?7 control register (ep n ctl) figure 12-17 shows the usb endpoint 1?7 control register. figure 12-17. usb endpoint 1-7 control register (ep n ctl) table 12-13 lists the field descriptions for the usb endpoint 1?7 control register. 15 8 field ? reset 0000_0000 r/w r/w 76543210 field crc_err iso_mode ? fifo_lvl in_done stall reset 0000_0004 r/w r/w addr mbar + 0x1052, 0x1056, 0x10 5a, 0x105e, 0x1062, 0x1066, 0x106a table 12-13. ep n ctl field descriptions bits name description 15?8 ? reserved, should be cleared. 7 crc_err crc error generation enable. enables crc error generation for debug and test purposes. to use this feature, the debug bit must be set. enabling this bit causes a crc error on the next non-zero-length data packet transmitted. the crc_err bit must be set again in order to generate another crc error. this bit is only valid for in endpoints. this command bit is write only and always returns 0 when read. 0 default value 1 crc error generation if debug = 1 6 iso_mode isochronous transfer mode. this bit must be set when the endpoint is configured for isochronous mode. 0 non-isochronous transfer mode 1 isochronous transfer mode 5?4 ? reserved, should be cleared. 3?2 fifo_lvl endpoint n fifo level for interrupt. this field selects th e fifo level to generate a fifo_lvl interrupt. the fifo_lvl interrupt is generated when the fifo fills above (out) or falls below (in) the selected level. in fifoout fifo 00 fifo 25% emptyfifo 25% full 01 fifo 50% emptyfifo 50% full 10 fifo 75% emptyfifo 75% full 11 fifo emptyfifo full
universal serial bus (usb) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 12-21 1 in_done this bit controls the usb's response to in tokens from the host. set at reset and on an eot event and must be cleared by software when the last byte of a transfer has been writte n to the in-fifo. this bit is then subsequently set by the usb core when an end of transfer (eot) event occurs, indicating that the transfer has been completed. an end of transfer (eot) event is indicated by one of the following: a) an in packet is transmitted that contains le ss than the maximum number of bytes defined at endpoint configuration. b) a zero length in packet is transmitted. this occu rs when the previously transmitted in packet was full, and no more data remains in the in-fifo. hence a single zero length packet must be sent to indicate eot. 0 cpu has completed writing to the in-fifo and transfer is in progress. the usb module sends all the data in the fifo, or a zero-len gth packet when the fifo is empty. 1 transfer completed or cpu is busy writing to the in-fifo. the usb module only sends maximum-sized packets or nak responses if the fifo contains less data than the maximum packet size. 0 stall force stall response. causes the endpoint to return a stall handshake when polled by either in or out token by the usb host controller. the st all handshake causes the endpoint to be halted. the stall bit is not valid for isochronous endpoints. this command bit is write-only and always returns 0 when read. 0 default 1 send stall handshake table 12-13. ep n ctl field descriptions bits name description
universal serial bus (usb) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 12-22 freescale semiconductor 12.3.2.15 usb endpoint 0 interrupt m ask (ep0imr) and general/endpoint 0 interrupt registers (ep0isr) figure 12-18 shows the usb endpoint 0 interrupt mask and general/endpoint 0 interrupt registers. note interrupt bits are reset by writing a 1 to the specified bits. writing 0 has no effect. table 12-14 lists field descriptions for the usb endpoint 0 interrupt mask and general/endpoint 0 interrupt registers. 31 24 field ? reset 0000_0000 r/w r/w 23 17 16 field ? dev_cfg reset 0000_0000 r/w r/w 15 14 13 12 11 10 9 8 field vend_req frm_mat asof sof wake_chg resume suspend reset reset 0000_0000 r/w r/w 76543210 field out_eot out_eop out_lvl in_eot in_eop unhalt halt in_lvl reset 0000_0000 r/w r/w addr mbar + 0x108c (ep0imr); mbar + 0x106c (ep0isr) figure 12-18. usb endpoint 0 interrupt mask (ep0imr) and general/endpoint 0 interrupt registers (ep0isr) table 12-14. ep0imr and ep0isr field descriptions bits name description 31?17 ? reserved, should be cleared. 16 dev_cfg device configuration change interrupt. set when a device configuration change has been received. the usb standard device requests set_configuration and set_interface generate a dev_cfg interrupt. any in or out packets to the active endpoints cause a nak response to the host while this bit is set in order to allow the user to initialize the endpoints? fifo?s. note that if one of these requests is done repeatedly and theref ore the registers don?t change, a dev_cfg interrupt is still generated. if debug mode is enabled, a change in far also generates an interrupt. 0 no interrupt pending 1 device configuration change received
universal serial bus (usb) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 12-23 15 vend_req class or vendor specific request receiv ed. set when a class- or vendor-specific request is received. when the application detects assert ion of vend_req interrupt, it should begin reading drr1 and drr2. 0 no interrupt pending 1 class or vendor specific request received 14 frm_mat frame number match. set when the usb fr ame number matches the value written to the fnmr register. 0 no interrupt pending 1 frame number match 13 asof artificial start of frame detec ted. set when an artificial sof is generated. the asof is used to notify the user that a sof packet was not detected as expected. 0 no interrupt pending 1 artificial sof generated 12 sof start of frame (sof) detected. set when a sof packet is detected. 0 no interrupt pending 1 sof detected 11 wake_chg remote wakeup status change interrupt. indi cates that a change has occurred in the epsr0[wake_st]. 0 no interrupt pending 1 remote wakeup status bit has changed 10 resume resume. set when the usb block is in the suspend state and detects resume signaling on the usb data lines. user-initiated resume signaling also causes the resume interrupt to be asserted. 0 no interrupt pending 1 usb resume signal detected 9 suspend suspend. set when the usb module detects a suspend state on the usb data lines. the usb suspends when the bus is idle for at least 3 ms. 0 no interrupt pending 1 usb suspend state detected 8 reset usb reset. set when the usb module detects a usb reset. a usb reset is caused by a single-ended zero (se0) greater than 2.5 s. a u sb reset has no effect on the registers written by the user. 0 no interrupt pending 1 usb reset signal detected 7 out_eot end of transfer. set when the end of a tr ansfer has been reached for out fifo. an out_eot is generated when a packet with a size less than the maximum packet size or the first zero-length packet following maximum size packets is received. the epdp0 must be read before clearing this interrupt in order to determine the number of bytes of remaining data in the fifo for the last transfer. any packets received from the host cause a nak response until the out_eot interrupt is cleared. 0 no interrupt pending 1 transfer completed 6 out_eop end of packet. set when a packet is successfully received for endpoint 0 out. 0 no interrupt pending 1 out packet received successfully 5 out_lvl out fifo threshold level. indicates that t he fifo level has risen above the level set in the epctl0 register. 0 no interrupt pending 1 out fifo threshold level reached table 12-14. ep0imr and ep0isr field descriptions (continued) bits name description
universal serial bus (usb) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 12-24 freescale semiconductor 4 in_eot end of transfer. this bit is set when the end of a transfer has been reached for an in endpoint. an eot interrupt is generated when a packet with a size less than the maximum packet size or the first zero-length packet following maximum size packets is sent. 0 no interrupt pending 1 transfer completed 3 in_eop end of packet. this bit is set when a packet has been sent successfully for endpoint 0 in. 0 no interrupt pending 1 in packet sent successfully 2 unhalt unhalt. this bit is set when the endpoint 0 halt_st bit is cleared by a setup packet or usb reset. 0 no interrupt pending 1 endpoint halt cleared 1 halt halt. this bit is set when the endpoint 0 halt_st bit is set due to a stall response to the host. 0 no interrupt pending 1 endpoint halted 0 in_lvl in fifo threshold level. this bit indicates that the fifo level has fallen below the level set in the epctl0 register. 0 no interrupt pending 1 in fifo threshold level reached table 12-14. ep0imr and ep0isr field descriptions (continued) bits name description
universal serial bus (usb) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 12-25 12.3.2.16 usb endpoints 1?7 stat us / interrupt registers (ep n isr) figure 12-19 shows the usb endpoints 1-7 status/interru pt registers. figure 12-19. usb endpoints 1?7 interrupt status registers (ep n isr) table 12-15 lists field descriptions for the usb endpoints 1?7 interrupt status registers. 15 14 13 12 5 4 3 2 1 0 field halt_st dir pres ? eot eop unhalt halt fifo_lvl reset 0000_0000_0000_0000 r/w interrupt bits are cleared by writing a 1 to the specified bits. bits 13?15 are read-only status bits. addr mbar + 0x1072, 0x1076, 0x107a , 0x107e, 0x1082, 0x1086, 0x108a table 12-15. ep n isr field descriptions bits name description 15 halt_st current status of endpoint n. this bit indi cates whether endpoint n is currently halted or active. halt_st is set due to a set_feature request wit h the endpoint halt feature selector set or a stall response to an in or out packet. halt_s t is cleared by a clear_feature request with the endpoint halt feature selector set. 0 endpoint n active 1 endpoint n halted 14 dir current direction of endpoint n. this bit indica tes whether endpoint n is currently configured as an in or out endpoint. 0 endpoint n configured as an out endpoint 1 endpoint n configured as an in endpoint 13 pres endpoint n present. this bit indicates whether or not endpoint n is present in the current configuration. 0 endpoint n absent 1 endpoint n present 12?5 ? reserved, should be cleared. 4 eot end of transfer interrupt. set when the end of a transfer has been reached. an eot interrupt is generated when a packet with a size less than the maximum packet size or the first zero-length packet following maximum size packets is sent or received. for out endpoints, the epdp n must be read before clearing this interrupt in order to dete rmine the number of bytes of remaining data in the fifo for the last transfer. for out endpoints, any packets received from the host cause a nak response until the eot interrupt is cleared. for in endpoints, the user must wait until the eot interrupt is set before writing the next transfer to the fifo. 0 no interrupt pending 1 transfer completed 3 eop end of packet interrupt. set when a packet is successfully sent or received on endpoint n. 0 no interrupt pending 1 packet sent or received successfully 2 unhalt endpoint unhalt interrupt. set when the endpoint n halt_st bit is cleared. 0 no interrupt pending 1 endpoint n unhalted
universal serial bus (usb) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 12-26 freescale semiconductor 12.3.2.17 usb endpoint 1?7 in terrupt mask registers (ep n imr) figure 12-20 shows the usb endpoint 1?7 interrupt mask register. figure 12-20. usb endpoint 1-7 interrupt mask registers (ep n imr) table 12-16 lists field descriptions for the us b endpoint 1?7 interrupt mask register. 1 halt endpoint halt interrupt. set when the endpoint n halt_st bit is set. 0 no interrupt pending 1 endpoint n halted 0 fifo_lvl fifo threshold level reached interrupt. indicate s that the fifo level has risen above or fallen below the level set in the epctl n register for out or in endpoints, respectively. 0 no interrupt pending 1 fifo threshold level reached 15 5 4 3 2 1 0 field ? eot_en eop_en unhalt_en halt_en fifo_lvl_en reset 0000_0000_0000_0000 r/w r/w addr mbar + 0x1092, 0x1096, 0x109a , 0x109e, 0x10a2, 0x10a6, 0x10aa table 12-16. ep n imr field descriptions bits name description 15?5 ? reserved, should be cleared. 4?0 interrupt mask. these bits are set when the user wants to activate the in terrupt source for the specific bit. refer to table 12-15 for a description of each interrupt source. 1 interrupt enabled 0 interrupt disabled table 12-15. ep n isr field descriptions (continued) bits name description
universal serial bus (usb) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 12-27 12.3.2.18 usb endpoint 0? 7 data registers (ep n dr) figure 12-21 shows the usb endpoint 0-7 data registers. table 12-17 lists field descriptions for th e usb endpoint 0?7 data registers. table 12-17. ep n dr field descriptions 31 16 field data reset 0000_0000_0000_0000 r/w r/w 15 0 field data reset 0000_0000_0000_0000 r/w r/w addr mbar + 0x10ac, 0x10b0, 0x10b4, 0x10b8, 0x10bc, 0x10c0, 0x10c4, 0x10c8 figure 12-21. usb endpoint 0-7 data registers (ep n dr) bits name description 31?0 data the ep n dr registers allow data to be written to/from each endpoint?s fifo. for in endpoints, the registers are write-only and writing to a full fifo is ignored. for out endpoints, the registers are read-only, and reading from an empty fifo returns undefined data. these registers can be accessed using 8-, 16-, or 32-bit accesses in order to read/write 1, 2, or 4 bytes from/to the fifo at one time.
universal serial bus (usb) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 12-28 freescale semiconductor 12.3.2.19 usb endpoint 0?7 da ta present registers (ep n dpr) figure 12-22 shows the usb endpoint 0-7 data present regist ers. used to coordinate user access to fifo with external devices to prevent da ta loss (overwrite) says how much free space is still available. gives amount of data just received. figure 12-22. usb endpoint 0-7 data present registers ( ep n dpr) table 12-18 describes epdp n fields. 12.3.3 configuration ram the usb module supports up to 1 kbyte of usb descri ptors. the configuration ram begins at address mbar + 0x1400 and is longword accessi ble only. epctl0[cfg_ram_val] must be cleared to access the configuration ram, othe rwise an access error results. 12.3.3.1 configuration ram content the usb host must configure a devi ce before that device?s function ca n be used. the host configures the device by first reading the descriptors for the device. the descriptors must follow the format described in chapter 9 of the usb specification a nd any relevant class specification. note the usb descriptors use li ttle endian format for wo rd and longword fields. the MCF5272 uses big endian format for words and longwords. the user must make sure that any word or longw ord fields are stored in the correct byte order. 15 9 8 0 field ? data_pres reset 0000_0000_0000_0000 r/w read addr mbar + 0x10ce, 0x10d2, 0x10d6, 0x10da, 0x10de, 0x10e2, 0x10e6, 0x10ea table 12-18. ep n dpr field descriptions bits name description 15?9 ? reserved, should be cleared. 8?0 data_pres endpoint n data present. this field reflects the number of bytes in the endpoint?s fifo. this field is updated when the user writes to or reads from the fifo and when the control logic accesses the fifo. for non-isochronous endpoints, the fifo level is only updated when a complete packet is received or transmitted without any errors. this occurs synchronously with an eop interrupt. for isochronous endpoints, the fifo le vel is updated by the control logic in real-time rather than only after the transfer of a complete packet. note: for non-isochronous out endpoints, this field is frozen while an eot interrupt is pending in order to allow the user to determine the num ber of bytes to read for the last transfer. for endpoint 0, epdp0 monitors the out fifo only.
universal serial bus (usb) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 12-29 a device may support multiple configurations. within any one configuration, the device may support multiple interfaces. an interface consists of a set of en dpoints that presents to the host a single feature or function of the device. an interface within a configuration may have alte rnate settings that redefine the characteristics of the asso ciated endpoints. all devices must provide a device desc riptor and at least one configuration, interface and endpoint descriptor. each configuration must have at least one interface and one endpoint descriptor. only one configuration is ef fective at any time, but se veral interfaces and their related endpoints may be operational at the same time . only one setting for a particular interface is effective at any time. 12.3.3.2 usb device c onfiguration example the example descriptor structure in figure 12-23 shows a device with three di fferent configurations. refer to chapter 9 of the usb specification for in formation on the contents of each descriptor. figure 12-23. example usb configuration descriptor structure this example is described in the configuration ram sequence shown belo w. the device de scriptor begins at address mbar + 0x 1400. each descriptor must im mediately follow the previ ous descriptor without any empty locations between them. 1. device descriptor 2. configuration #1 descriptor 3. interface #0 descriptor 4. endpoint #1 descriptor 5. endpoint #2 descriptor 6. interface #1 descriptor 7. endpoint #3 descriptor 8. configuration #2 descriptor endpoint #2 descriptor endpoint #1 descriptor endpoint #1 descriptor endpoint #3 descriptor endpoint #2 descriptor endpoint #1 descriptor interface #0 descriptor interface #1 descriptor interface #0 descriptor interface #0 descriptor configuration #1 descriptor configuration #2 descriptor configuration #3 descriptor device descriptor
universal serial bus (usb) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 12-30 freescale semiconductor 9. interface #0 descriptor 10. endpoint #1 descriptor 11. configuration #3 descriptor 12. interface #0 descriptor 13. endpoint #1 descriptor 14. endpoint #2 descriptor 12.3.4 usb module access times the access times for the usb module depend on whether the access is to a register, to an endpoint fifo (ep n dr register), or to the configuration ram. 12.3.4.1 registers the usb module registers are accessed through the inte rnal s-bus. each register access takes 3 clock cycles for reads and writes. 12.3.4.2 endpoint fifos the fifo access time depends on the size, the time between accesses, and whether the previous fifo access was for the same endpoint. after a longword acce ss to an endpoint?s fifo, the next longword in the fifo is cached for a quicker access time on the next longword read. this mechanism is reset every time another endpoint is accessed. table 12-19 shows the access times for the fifos. 12.3.4.3 configuration ram the configuration ram is longword accessible only. access times for reads fro m the configuration ram are eight clock cycles per access. clock cycle access ti mes for back-to-back writes to the configuration ram are 3-5-5-5-5-5... access times for writes sepa rated by at least 1 cloc k cycle are 3-3-3-3-3-3? table 12-19. usb fifo access timing access type read write byte 5 4 word 6 4 long (back to back) 8-4-6 -6-6-6... 4-6-6-6-6-6... long (1 clock gap) 8-3-5- 5-5-5... 4-5-5-5-5-5... long (2 clock gap) 8-3-4- 4-4-4... 4-4-4-4-4-4... long (3+ clock gap) 8-3-3-3 -3-3... 4-4-4-4-4-4...
universal serial bus (usb) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 12-31 12.4 software architecture and application notes this section describes arch itecture and applications. 12.4.1 usb module initialization at power-up, the usb module should be initialized within 20 ms if the usb port is connected. this time corresponds to the 10 ms reset signaling and 10 ms rese t recovery time when a device is detected. the following steps are necessary to in itialize the usb module for operation: 1. clear ep0ctl[cfg_ram_val,usb_en]. 2. load the configuration ram with the descriptor s from external rom. th e starting configuration ram address is mbar + 0x1400. 3. select the internal or extern al usb transceiver in epc0tl. 4. write iep0cfg and oep0cfg to in itialize the ep0 in and out fifos. 5. initialize the ep0 interrupt vectors. 6. clear all interrupt bits in ep0isr. 7. enable the desired ep0 interrupt sources in ep0imr. 8. set ep0ctl[usb_en, cfg_ram_valid]. 12.4.2 usb configuration and interface changes although the usb module ha ndles the set_configuration a nd set_interface requests, the user is still required to perform some initialization wh en the configuration or a lternate settings change. a configuration or alternate setting change is signaled by the dev_cfg interrupt. the following steps are required to service the dev_cfg interrupt. 1. read epsr0 and asr to determine the curre nt configuration and alternate settings. 2. read the endpoint descriptors for the current configuration and alte rnate settings to determine the endpoint type and maximum packet size for all of the active endpoints. 3. write ep n cfg for all active endpoints to initialize the fifos. 4. initialize the interrupt vectors for the active endpoints. 5. clear all interrupt bits in the ep n isr registers for all active endpoints. 6. enable the desired interrupt sources in the ep n imr registers. 7. clear the dev_cfg interrupt bit to al low the usb module to access the fifos.
universal serial bus (usb) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 12-32 freescale semiconductor 12.4.3 fifo configuration the usb module allows a very flexible fifo configur ation. the fifo configurat ion is very application dependent. the fifo configuration de pends on the current configuration num ber, alternate setting for each interface, and each endpoint?s type and packet size. the usb module contains two separate 512-byte fifo spaces: one for in and one for out endpoints. the following guidelines must be adhered to when configuring the fifo?s: ? the max_packet field in the ep n cfg registers must match the wmaxpacketsize field in the corresponding endpoint descriptor. an incorrec t setting causes usb errors and unexpected interrupts. ?ep n cfg[fifo_size] must be a power of 2 and must be at leas t two packets for non-isochronous endpoints. ? the fifo_addr field in the ep n cfg registers must be aligne d to a boundary defined by the fifo_size field. for exampl e, a fifo with a size equal to 64 bytes can ha ve a starting address of 0, 64, 128, 192, 256, etc. ? the fifo space for an endpoint defined by fifo _size and fifo_addr must not overlap with the fifo space for any other e ndpoint with the same direction. an example fifo configuration with a variety of endpoint types and packet sizes is shown in table 12-20 . 12.4.4 data flow the handling of the data flow to and from each endpoint can be divided between isochronous and non-isochronous endpoints. isochronous endpoints are designed to transf er streaming data which is continuous and real-t ime in creation, delivery, and consumption. th e timely delivery of isochronous data is ensured at the expense of potential transient losse s in the data stream. in other words, any error in electrical transmission in not corrected by hardware mechanisms such as retries. an example of streaming data is voice. the other endpoint types transfer message based, or bur sted data where integrity of the data is more important than timely delivery. table 12-20. example fifo setup endpoint number endpoint direction endpoint type max packet size fifo size fifo starting address ep n cfg value 0 in control 8 32 480 0x020101c0 0 out control 8 32 384 0x02010180 1 in interrupt 17 64 384 0x04420180 2 in bulk 64 128 256 0x10040100 3 out bulk 32 128 256 0x08040100 4 in isochronous 5 32 448 0x014101c0 5 out isochronous 5 32 416 0x014101a0 6 in isochronous 300 256 0 0x4b080000 7 out isochronous 300 256 0 0x4b080000
universal serial bus (usb) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 12-33 12.4.4.1 control, bulk, a nd interrupt endpoints the data flow for control, bulk, and interrupt endpoint s can be handled the same way for all 3 types of endpoints. control, bulk, a nd interrupt endpoints all support guarantee d data delivery. if the host detects an error during the read of a packet from an in endpoi nt, it requests that the pa cket be resent from the device. the usb fifo mechanism takes care of this without interrupting the cp u. in a similar fashion, the usb fifo mechanism keeps a received packet fr om being read by the user until the control logic validates the packet for transmission errors. 12.4.4.1.1 in endpoints the following example demonstrates how to transmit a transfer on an in endpoint: 1. wait until the last transfer is co mplete (an eot interrupt has occurred). 2. write data to the fifo to fill it. 3. wait for eop interrupt or poll eop bit. 4. read ep n dp to determine the number of bytes that can be written to the fifo. normally, only one packet should be written un less the software does not service the eop immediately. 5. write data to the fifo to fill it or until al l of the data for the tr ansfer has been written. 6. repeat steps 5?7 until all of the data for the transfer has been written to the fifo. 7. clear ep n ctl[in_done]. 8. wait for the eot interrupt or pol l the eot bit. the user can now be gin processing the next transfer. 12.4.4.1.2 out endpoints the following example demonstrates how to ha ndle a received transfer on an out endpoint: 1. wait for the eop interrupt or poll the eop bit. 2. read ep n dp to determine number of bytes in the fifo. 3. read the indicated number of bytes of data from the fifo into a buffer. 4. repeat steps 1?3 until eot is set. 5. when eot is set, the transfer is complete. whil e eot is set, the fifo is locked and any packets sent for the next transf er cause a nak response. 6. read ep n dp to determine the number of bytes in the fi fo if any for the last transfer. the eot bit can be cleared once this register has been read. 7. read the indicated number of bytes of data from the fifo into a buffer. 8. the user can now proce ss the received transfer. 12.4.4.2 isochr onous endpoints the data flow for isochronous endpoints must be handled differently than the data flow for non-isochronous endpoints. data on isochronous endpoints is generally streaming data. therefore, there is no concept of transfers and eot. in addition, isochronous endpoints diff er from other endpoint types in two distinct ways. isoc hronous endpoints support packet sizes up to 1023 bytes and isochronous packets are never resent. in order to support the large packet sizes, the fifo size can be less than two times the
universal serial bus (usb) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 12-34 freescale semiconductor packet size and the epdp n registers are updated in real -time, not just at the end of a packet as with other endpoint types. if the packet size is larger than th e fifo size, the fifo leve l interrupt must be used. isochronous packets are guaranteed to occur once pe r usb frame. the sof and asof interrupts are provided in order for the us er to synchronize the data flow with the usb. the so f interrupt occurs every 1 ms provided the usb is active. the asof interrupt is gene rated if the usb module fails to detect a sof packet within the set timeout period. it is strongly recommended that in terrupts be used rather than pol ling for isochronous endpoints as isochronous endpoints do not have any error detection or flow-control mech anisms. if the packet size is larger than the fifo size, using interrupts is required. 12.4.4.2.1 in endpoints the user should write one pack et of data to the in fifo per frame. if an asof interrupt occurs, the user may wish to insert additional data in the data stream if the data for th e frame is lost. the following example demonstrates how to handle an isochr onous in packet e ach frame with a packet si ze larger than the fifo size: 1. wait for the sof interrupt for synchronization. 2. write data to the fifo until filled. 3. wait for fifo_lvl interrupt. 4. read ep n dp to determine the number of bytes that can be written to the fifo. 5. write data to the fifo to fill it or until al l of the data for the pa cket has been written. 6. repeat steps 3?5 until the entire p acket has been written to the fifo. 12.4.4.2.2 out endpoints the user should read one packet of data from the out fifo per frame. if an asof interrupt occurs, the user may wish to discard the data for the frame. the following example demons trates how to handle an isochronous out packet each frame with a pa cket size larger than the fifo size: 1. wait for sof interrupt for synchronization. the user may want to track that a packet is received for every frame. 2. wait for the fifo_lvl interrupt. 3. read epdp n to determine number of bytes in the fifo. 4. read data the indicated num ber of bytes from the fifo. 5. repeat steps 2?4 until entire packet is received. 6. wait for eop or sof interrupt and re ad any remaining data in the fifo. 7. an eot interrupt indicates a short or zero-length packet. 12.4.5 class- and vendor-specific request operation the class- and vendor-specific requests are specific to a particular device cl ass or vendor, and are not processed by the usb request processor. when the usb module receives a class or vendor request, the parameters for the request are written to the drr1 and drr2 registers and the user is notified of the
universal serial bus (usb) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 12-35 request with the vend_req interrupt . the user must take the following step to pr ocess a class or vendor request: 1. read drr1 and drr2 to determine the request type. 2. if the request has a data stage, the ep0 fifo shoul d be read or written with the number of bytes as defined in the drr2[wlength]. refer to for more details on accessing the fifos. 3. when the user has finished processing the re quest, ep0ctl[cmd_over] mu st be set to signal completion of the request. [cmd _err] must also be set simultaneously if an error was encountered while processing the request. 12.4.6 remote wakeup and resume operation the MCF5272 supports usb resume initiated from three different s ources. two of the sources are for remote wakeup capability. the three differ ent resume mechanisms are listed below: ? the user sets ep0ctl[resume]. the usb module responds to this only if the usb is in the suspended state and ep0sr[wake_st] is set. the coldfire core must be running to write e0pctl. to meet usb timing sp ecifications, the resume bit must not be set until two milliseconds have elapsed since the usb module entered suspend state. ? the wake-on-ring int1 interrupt pin is at the active leve l defined in ep0ctl. the usb module responds to the int1 pin only if the wake-on-ri ng function is enabled, the usb is in the suspended state and ep0sr[wake_st] is set. the coldfi re core may be powered down, and the resume signaling wakes up the coldfire core. the wake- on-ring function must not be enabled until two milliseconds have elapsed since the usb module entered the su spend state in order to meet usb specification timing requirements. ? the usb module detects any activity on the us b, which may be normal bus activity, resume signaling, or reset signaling. the coldfire core may be powered down, a nd the resume signaling wakes up the coldfire core. 12.4.7 endpoint halt feature usb has the ability to halt endpoints due to errors. the user is not ified when an endpoint is halted and when the halt is cleared. when an endpoint is halt ed, the user should abort the current transfer and reinitialize the fifo for the endpoint. an endpoi nt can be halted for a variety of reasons. ? set _ feature request with the endpoint halt feature selector set. ?ep n ctl[stall] is set by the user. th is bit should be set on ly when there is a critical error on the endpoint. ? on control endpoints, an error processing a request. a halted endpoint can be cleare d in several different ways: ? clear _ feature request with the endpoint halt feature selector set. ? a usb reset signal. ?a set _ configuration or set _ interface request. ? on control endpoints, a setup token for the next request.
universal serial bus (usb) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 12-36 freescale semiconductor 12.5 line interface the recommended line interface is shown in figure 12-24 . the transistor used to control the 1.5?k pull-up resistor is optional. figure 12-24. recommended usb line interface 12.5.1 attachment detection the usb specification requires that a pull-up resistor must be placed on the d+ signal for the upstream hub to detect attachment of a full-s peed device. the user may optionally want to control the attach/detach detection by software instead of only at power on and off. with soft ware control of the pull-up resistor, the user has unlimited time to initia lize the usb module. the software co ntrolled pull-up resistor can be implemented with only a few disc rete components. the recommended circuit for implementing software control of the pull-up resistor is shown in figure 12-24 . 12.5.2 pcb layout recommendations the device has input protection on al l pins and may source or sink a limited amount of current without damage. the most important considerations for pcb layout d eal with noise: noise on the power supply, noise generated by the digital circuitry on the device, and noise resulting from coupling digital si gnals into the analog signals. the best pcb layout methods to prevent noise?induced problems are as follows: ? keep digital signals as far away from analog signals (d+ and d-) as possible. ? use short, low inductance traces for the analog circuitry to reduce inductive, capacitive, and radio frequency noise sensitivities. ? use short, low inductance traces for digital circ uitry to reduce inductive, capacitive, and radio frequency radiated noise. gp i/o pin usb_d+ usb_d- usb series b receptacle vbus d+ d? gnd 3.3 v 1k 100 33 33 1.5k 5% MCF5272
universal serial bus (usb) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 12-37 ? bypass capacitors should be conn ected between the vdd and gnd pairs with minimal trace length. these capacitors help supply the instantaneous curr ents of the digital circuitry, in addition to decoupling the noise that may be ge nerated by other sections of the device or other circuitry on the power supply. ? use short, wide, low inductance traces to connect all of the gnd pins t ogether and, with a single trace, connect all of the gnd pi ns to the power supply ground. this helps to reduce voltage spikes in the ground circuit caused by hi gh-speed digital current spikes. suppressing these voltage spikes on the integrated circuit is the reason for multiple gnd l eads. a pcb with a ground plane connecting all of the digital and analog gnd pins together is the optim al ground configuration, producing the lowest resistance and inductance in the ground circuit. ? use short, wide, low inductance traces to connect all of the vdd power s upply pins together and, with a single trace, connect all of the vdd pins to the 3.3v power supply. connecting all of the digital and analog vdd pins to th e power plane would be the optim al power distribution method for a multi-layer pcb with a power plane. ? the 48-mhz oscillator must be loca ted as close as possible to the chip package. this is required to minimize parasitic capacitance be tween crystal traces and ground. 12.5.3 recommended usb protection circuit figure 12-25 shows the recommended external esd protection circuit for the usb. figure 12-25. usb protection circuit 1 2 3 4 330 1.5k 33 33 22pf 22pf 2 x mmbd301lt1 schottky diode usb port bzx84c3v3lt1 zener diode 0.1 f +3.3v +3.3v d + d ?
universal serial bus (usb) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 12-38 freescale semiconductor
MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 13-1 chapter 13 physical layer interface controller (plic) this chapter provides detailed information about the MCF5272?s physical layer interface controller (plic), a module intended to suppor t isdn applications. the chapter begins with a description of operation and a series of related block diagrams starting with a hi gh-level overview. each successive diagram depicts progressively more internal detail . the chapter then describes timing generation, the programming model, and concludes wi th three application examples. the reader is assumed to have a basic familiarity with isdn t echnology and terminology. a glossary containing many isdn terms can be found on the web at the following url: http://www.tribecat ech.com/isdnterm.htm . 13.1 introduction the physical layer interface controlle r (plic) allows the MCF5272 to c onnect at a physical level with external codecs (coder/decoder) and other peripheral devices that use ei ther the general circuit interface (gci) or interchip digital link (i dl) physical layer protocols. this module is primar ily intended to facilitate designs that include isdn (integra ted services digital network) interfaces. the MCF5272 has four dedicated physical layer inte rface ports for connecti ng to external isdn transceivers, codecs, and other periph erals. there are three sets of pins for these interfaces. port 0 has its own dedicated set of pins. ports 1, 2, and 3 share a se t of pins. port 3 can also be configured to use a dedicated pin set. ports 1, 2, and 3 alwa ys share the same data clock (dcl). when the ports are operated in slave mode, the plic can support a dcl frequency of 4.096 mhz and frame sync frequency (fsc/fsr) of 8 khz. when in master mode, dc l should be no greater than one-twentieth of the cpu clock (clkin ), with a maximum fsc/fsr of 8 khz. this chapter is written from the pe rspective of connect ing to an isdn transceive r with 8-khz frame sync. the MCF5272 plic has four ports, port 0 ? port 3, connected through th ree pin sets, numbered 0, 1, and 3. a port can service, rea d, or write any 2b + d ch annel. as shown in figure 13-1 , port 0 connects through pin set 0, and ports 1 and 2 both connect through set 1. port 3 can use either pin set 1 or 3. pin set 3 consists of data in and data out. data clock and frame sync are common to pin set 1 and 3. in th e case of set 1, which connects multiple ports, separate delayed frame sync generators ar e provided for each port which distinguish each port?s active time slots. see section 13.6, ?application examples ? for further information.
physical layer interface controller (plic) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 13-2 freescale semiconductor figure 13-1 illustrates the basic plic system. figure 13-1. plic system diagram the four ports have the followin g timing and connectivity features: ? port 0: connects through pin set 0. operates as a sl ave-only port; that is, an external device must source frame sync clock/frame s ync receive (fsc/fsr) and data clock (dcl). these pins are unidirectional inputs. din0 and dout 0 are dedicated pins for port 0. ? port 1: connects through pin set 1. operates as a ma ster or slave port. in slave mode an external device must source fsc/fsr and dcl. in master mode, dcl1 and fsc1/fsr1 are outputs. these signals are in turn derived from the dcl0 a nd fsc/fsr from port 0. for port 1 to function in master mode, port 0 must be enab led with an external transcei ver sourcing dcl and fsc/fsr. the physical interface pins din1 a nd dout1 serve ports 1, 2, and 3. ? port 2: connects through pin set 1. operates as a slave-only port. port 2 shares a data clock with port 1: dcl1 when port 1 is in slave mode or gd cl when port 1 is in master mode. a delayed frame sync, dfsc2, derived from fsc1, is connect ed to the dfsc2 output and fed to the port 2 idl/gci block. users can synchronize the port 2 idl/gci block with an offset frame sync, (offset with respect to the port 1 gci/idl block), by pr ogramming the port 2 sync delay register, p2sdr. ? port 3: connects through pin set 1 or 3. operates as a slave-only po rt. port 3 shares a data clock with port 1: dcl1 when port 1 is in slave mode , or gdcl, when port 1 is in master mode. a delayed frame sync, dfsc3, is derived from fsc1 and is fed to the port 3 idl/gci block. programming the port 3 sync delay register, p3sdr, allows it to be synchronized with an offset internal interface registers port 1 port 2 port 3 pin set 1 mux gci/idl gci/idl gci/idl pin set 3 mux timing gen timing gen timing gen port 0 gci/idl pin set 0 pa8/fsc0/fsr0, pa9/dgnt0, dcl0/urt1_clk, din0/urt1_rxd, dout0/urt1_txd, pa10/dreq0 pin set 1 fsc1/fsr1/dfsc1, dcl1/gdcl1_out, pa14, pa15_int6/dgnt1_int6, dout1, din1 pin set 3 pa7/qspi_cs3/dout3, din3/int4 din3 dout internal bus timing generator 32 32 32 32
physical layer interface controller (plic) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 13-3 frame sync (offset with respect to the port 1 gci/ idl block). port 3 can also have dedicated data in and data out pins, din3 and dout3 of pin set 3 (see section 13.5.7, ?port configuration registers (p0cr?p3cr) ?). this allows the MCF5272 to c onnect to isdn nt1s that have a common frame sync and clock, but two sets of serial data-in and data-out pins. the MCF5272 plic provides two sets of d-channel arbitration control pins: ? dreq0 and dgnt0 for pin set 0 ? dreq1 and dgnt1 for pin set 1 because pin set 1 connects ports 1, 2, and 3, these ports do not have d-channel arbitration control signals. 13.2 gci/idl block this section describes the gci/idl block. 13.2.1 gci/idl b- and d-channel receive data registers figure 13-2. gci/idl receive data flow the maximum data rate received for each gci/idl port is 144 kbps: th e sum of two 64-kbps b channels and one 16-kbps d-cha nnel. frames of b 1 and b 2 channels are packed togeth er to form longwords (32 bits). frames of d-channels are packed together to form bytes. for channels b and d, this requires cpu service at a 2-khz rate, becau se it requires four frames to fill th e 32-bit b-channel regi ster and the 8-bit d-channel register. the cpu should service the b1 and b2 registers once every 500 s. overrun conditions can be avoided only if the cpu services these registers in a timely manner. the MCF5272 has 4 gci/idl in terfaces. thus the theoretical maximum is twelve 32-bit da ta registers to be read. for most applications the typical number is less. d channel b1 shift register b2 shift register d shift register din dcl b2 channel b1 channel 32 32 8 internal bus demultiplexing circuitry
physical layer interface controller (plic) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 13-4 freescale semiconductor figure 13-3 shows the shift register, shadow register, inte rnal bus register, and multiplexor for each b receive channel. after reset, the b- and d-channel shift registers and shadow registers are initialized to all ones. figure 13-3. gci/idl b-channel receive data register demultiplexing 13.2.2 gci/idl b- and d-channe l transmit data registers figure 13-4. gci/idl transmit data flow the maximum transmission rate for each gci/idl port is 144 kbps: th e sum of two 64-kbps b channels and one 16-kbps d-cha nnel. frames of b 1 , b 2 , and d-channels are packed toge ther in a similar way to the receive side. because the reception and transmissi on of information on the gci/id l interface is deterministic, a common interrupt is generated at th e 2-khz rate. it is expected that a common interrupt service routine services the transmit and receive registers. after reset, the b- and d-channel shift registers and shadow registers are initialized to all ones. 8 bits demux 32 bits internal bus 8-khz rate shift register (b1 or b2) 2-khz transfer and interrupt 8 bits 8 bits 8 bits 8 bits shadow register start end din 64 kbps 32 32 b1, b2, receive data register b1 b2 d b1 shift register b2 shift register d shift register dout dcl 32 32 8 internal bus multiplexing circuitry
physical layer interface controller (plic) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 13-5 figure 13-5. gci/idl b data transmit register multiplexing 13.2.3 gci/idl b- and d- channel bit alignment unencoded voice is normally pr esented on the physical line most significant bit firs t (left aligned). see the mc145484 data sheet for an example. accordingly, the MCF5272 normally assumes incoming data are left-aligned. however, this convention is reversed when the data stream is hdlc (high- level data link control) encoded. hdlc-stuffing and unstuffing are done by c ounting bits from the lsb. the look-up table in the software hdlc on this device transmits the lsb first. 13.2.3.1 b-channel unencoded data because unencoded voice data appears on the physical interface most significant bit (msb) first, the msb is left aligned in the transmit and receive shift register ; that is, the first bit of b-channel received data is aligned in the msb position as shown in figure 13-6 . the cpu uses longword (32-bit) registers (like p0 b1rr) to communicate b-channel data to/from the plic. these registers are loaded by concatenating four of the 8-bit/8- khz frames. the four frames are aligned sequentially as shown in figure 13-6 , with the first frame in th e most significant byte (msb) position, and the fourth frame taking the least significant byt e (lsb) position. see section 13.5.1, ?b1 data receive registers (p0b1rr?p3b1rr) ,? or section 13.5.5, ?b2 data transmit registers (p0b2tr?p3b2tr) ,? for more information about some of these registers. 8 bits mux internal bus 8-khz rate shift register 2-khz transfer and interrupt shadow register 8 bits 8 bits 8 bits 8 bits start end 32 bits 32 32 b1, b2 transmit data register
physical layer interface controller (plic) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 13-6 freescale semiconductor . figure 13-6. b-channel unencoded and hdlc encoded data 13.2.3.2 b-channel hdlc encoded data when the incoming b channels contain hdlc encoded data they are presented on the physical line least significant bit (lsb) first. the soft hdlc expects the fi rst bit received to be ali gned in the lsb position of a byte, with the last bit recei ved aligned in the msb position. because the presentatio n of hdlc encoded data on th e physical interface is lsb (least significan t bit) first for b1 and b2 the lsb is right-aligned in the transmit a nd receive shift register, that is, the first bit of the b-channel received is aligned in the lsb position through to the last receive d bit of a byte that is aligned in the msb position. the ordering of the bytes over four frames within th e longword register is as for unencoded data; that is, the first frame is aligned in the msb through to the f ourth frame, which is ali gned in the lsb position. see figure 13-6 . 13.2.3.3 d-channel hdlc encoded data when the incoming d channels cont ain hdlc-encoded data, they are pr esented on the physical line lsb first. the soft hdlc expects the firs t bit received to be aligned in the lsb position of a byte, with the last bit received aligned in the msb position. dcl fsr din/dout frame 0 frame 1 b 7 b 6 b 5 b 4 b 3 b 2 b 1 b 0 b 7 b 6 b 5 b 4 b 3 b 2 b 1 b 0 b 7 b 6 b 5 b 4 b 3 b 2 b 1 b 0 b 7 b 6 b 5 b 4 b 3 b 2 b 1 b 0 32-bit b1/b2 receive/transmit registers, p n b1rr, p n b2rr, p n b1tr, p n b2tr frame 0 frame 1 frame 2 frame 3 b 7 b 6 b 5 b 4 b 3 b 2 b 1 b 0 b 7 b 6 b 5 b 4 b 3 b 2 b 1 b 0 b 7 b 6 b 5 b 4 b 3 b 2 d 0 d 1 din/dout b 1 b 2 d b 0 b 1 b 2 b 3 b 4 b 5 b 6 b 7 b 0 b 1 b 2 b 3 b 4 b 5 d 0 d 1 b 0 b 1 b 2 b 3 b 4 b 5 b 6 b 7 unencoded hdlc encoded
physical layer interface controller (plic) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 13-7 because the presentation of hdlc encoded data on th e physical interface is lsb first, the lsb is right-aligned in the transmit and receive shift register. a d-channel byte is formed by concatenating two d bi ts from each of four frames. this data is also right-aligned in the d-channel receive register as shown in figure 13-7 . figure 13-7. d-channel hdlc encoded and unencoded data. 13.2.3.4 d-channel unencoded data as with the b channel, a mechanism is provided to support incoming d channels containing unencoded data, even though as of this doc ument?s publication date, no communi cation protocols using unencoded d-channel data are known. as with unencoded (pcm encoded) b-channel data, it is assumed unencoded d-channel information is presented on the physical line msb first. the msb is le ft-aligned in the transmit and receive shift register, that is, the first bit receive d is aligned in the msb position through to th e last received bit of a byte that is aligned in the lsb position. a d-channel byte is formed by concat enating two d bits from each frame over four c onsecutive frames as shown in figure 13-7 . these 8 bits are also left-aligned in the d- channel receive register, that is, the first two d-channel bits fr om the first frame go into the two msbs, b 7 and b 6 , the next two d-channel bits from the second frame in b 5 and b 4 , and so on, until the last two d-channel bits in the fourth frame are aligned in b 1 and b 0 . dcl fsr din/dout d 0 d 1 frame 0 frame 1 frame 32 1 0 d7 d6 d5 d4 d3 d2 d1 d0 d 2 d 3 d 4 d 5 d 6 d 7 frame 2 frame 3 din/dout d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0 unencoded hdlc encoded 8-bit d-channel receive/transmit register, rd, td
physical layer interface controller (plic) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 13-8 freescale semiconductor 13.2.3.5 gci/idl d-ch annel contention typically, when the cpu wants to transmit a d- channel packet, it starts the hdlc framer. in idl mode, when the cpu can start sending data from the prepared hdlc frame to the d-channel transmit register, it asserts dreq by setting the appropriate drq bit in the pdrqr register. the d-channel controller hardware looks for a valid dgrant back from the layer 1 transceiver and, assuming dreq is also valid, begins trans mitting the d-channel packet. pdcsr[dg n ] reflects the value of the dedicated dgrant pin. refer to the mc145574 data sheet for scit mode information. in gci mode the only d-channel co ntention control is provided by p n cr[g/s], section 13.5.7, ?port configuration registers (p0cr?p3cr) .? provided the plic operate s in scit mode, pdcsr[dg n ], section 13.5.19, ?d-channel stat us register (pdcsr) ,? is defined by the state of p n cr[g/s], and is used to control d-channel transmission along with pdrqr[drq n ], section 13.5.20, ?d-channel request register (pdrqr) .? in gci mode, the plic ports do not suppor t any other form of d-channel contention such as the indirect mode found on the freescale mc145574. in gc i mode, the dgrant pin function found in idl mode is disabled and the pin can be defined for other functions . please note that the d-channel periodic interrupts in both the receive and transmit direction are not disabled even though the shift register is disabled by dreq, dgrant, and pdrqr[dcnti n ] ( section 13.5.20, ?d-channel request register (pdrqr) ?) configuration. an override mechanism for d-channel contention c ontrol is provided through the d-channel ignore dcnti bit. figure 13-8 illustrates this functionality: figure 13-8. d-channel contention 13.2.4 gci/idl looping modes the plic ports can be configured to opera te in various looping modes as shown in figure 13-9 . these modes are useful for local and re mote system diagnostic functions. the loopback modes are independent signal loopbacks for the respective ports. these loopbacks allow for the echoing of local or remote information. in au to-echo or remote-loopback modes there is no time switching or time slot assignment function. all data received on din is transmitted on dout during the same time slot. similarly, in lo cal-loopback mode, the information tr ansmitted on the dout pin is echoed back on din during the same time slot. the plic transmitter and receiver should both be disabled when swit ching between modes. shift register enable dgrant dreq dcnti
physical layer interface controller (plic) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 13-9 13.2.4.1 automatic echo mode the port automatically retransmits the received da ta on a bit-by-bit basis in this mode. the local cpu-to-receiver communicati on continues normally, but the cpu-to-tra nsmitter link is disabled. while in this mode, received data is cloc ked on the receiver clock and retr ansmitted on transmit dout pin. 13.2.4.2 local loopback mode txdata is internally connected to rxdata in this m ode. this mode is useful fo r testing the operation of a local port by sending data to the transmitter and checki ng data assembled by the r eceiver. in this manner, correct channel operations can be assured. also, both transmitter and cpu-to-receiver communications continue normally in this mode. whil e in this mode, the recei ve din pin is ignored, the transmit dout is held marking, and the receiver is clocked by the transmitter clock. 13.2.4.3 remote loopback mode the channel automatically transmits received data on the transmit dout pin on a bit-by-bit basis in this mode. the local cpu-to-transmitter link is disabled. this mode is useful in testing receiver and transmitter operation of a remote channel. wh ile in this mode, the receiver clock is used for the transmitter. figure 13-9. gci/idl loopback mode 13.2.5 gci/idl interrupts the plic module generates two interrupts?the periodic frame interrupt and the ap eriodic status interrupt. 13.2.5.1 gci/idl period ic frame interrupt the frame interrupt is a periodi c 2-khz interrupt as shown in figure 13-10 . this is the normal interrupt rate for servicing the incoming and outgoing b and d ch annels. this service routine must execute in a timely manner. each of the b- and d-channel transm it and receive registers s hould be written and read prior to the next 2-khz interrupt for unde rrun or overrun conditions to be prevented. disabled cpu rx tx disabled (a) automatic echo disabled cpu rx tx disabled (b) local loopback din dout din dout cpu rx tx (c) remote loopback din dout disabled disabled disabled disabled
physical layer interface controller (plic) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 13-10 freescale semiconductor note that only the active, that is enabled, b- and d-ch annel receive and transmit re gisters need to be read and written. b and d channels which are not active need not have their receive and transmit registers read and written. figure 13-10. periodic frame interrupt it should be clear from figure 13-10 that due to the double buffering th rough the plic shadow register, frame (n) is written to the plic tr ansmit register during the interrupt se rvice routine of the previous frame, frame (n-1). similarly on the receive side, frame (n) is read from the plic receive register during the interrupt service routine of the following frame, frame (n + 2). figure 13-10 shows that the minimum delay through the plic, when not in loopb ack mode, is two 2-khz frames, or 1 ms. 13.2.5.2 gci aperiodic status interrupt the aperiodic status interru pt is an interrupt which is driven by a number of c onditions. the cpu services this interrupt by reading the aperiodic status register, asr, and by reading or wr iting the relevant c/i or monitor channel register or regist ers which have generated this inte rrupt. once read, the interrupt is cleared. each port and individual interrupts within ea ch port is maskable. the following conditions for each of the ports can trigger this interrupt: ? monitor channel receive: asr defines which port or ports have generated a monitor channel receive interrupt. the interrupt service routine mu st then read the appropriate gmr register or registers to clear the monito r channel receive interrupt. ? monitor channel transmit: asr defines which por t or ports have generated a monitor channel transmit interrupt. the interrupt service routine mu st then read the approp riate gmt register or registers to clear the monito r channel transmit interrupt. ? c/i channel receive: asr defines which port or ports have generated a c/i channel receive interrupt. the interrupt service rout ine must then read the appropriate gcir register or registers to clear the c/i channe l receive interrupt. ? c/i channel transmit: asr defi nes which port or ports have ge nerated a c/i channel transmit interrupt. the interrupt service rout ine must then read the appropriat e gcit register or registers to clear the c/i channel transmit interrupt. slot 0 slot 1 slot 2 slot 3 frame n frame n + 1 2-khz interrupt 2-khz interrupt interrupt service routine read frame n -1 (b&d) write frame n + 1 (b&d) interrupt service routine read frame n (b&d) write frame n + 2 (b&d) interrupt service routine read frame n + 1 (b&d) write frame n + 3 (b&d) 500 s 125 s slot 0 slot 1 slot 2 slot 3 slot 0 slot 1 frame n + 2 slot 2 2-khz interrupt
physical layer interface controller (plic) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 13-11 13.2.5.3 interrupt control there are a number of control mechanisms for th e periodic and aperiodi c interrupts on the plic. ? clearing the on/off bit in th e port configuration register, section 13.5.7, ?port configuration registers (p0cr?p3cr) ,? turns the port off and masks all pe riodic and aperiodic interrupts for the affected port. ? clearing the enable bits, enb1 or enb2, in th e port configuration regi ster masks the periodic transmit and receive interrupts associated with the respective b1 or b2 channel. ? specific interrupt enables are provi ded in each port?s icr. this incl udes a port interrupt enable, ie, which masks all periodic and aperiodic interrupts. in addition, there are interrupt enables for specific conditions. th ese are listed in section 13.5.9, ?interrupt c onfiguration registers (p0icr?p3icr) .? 13.3 plic timing generator 13.3.1 clock synthesis the plic clock generator employs a completely di gital, synchronous design which can be used to synthesize a new clock by multiplyi ng an incoming reference clock. this clock generator is not a pll?it has no vco or phase comparator. the frequency multiplication factor is always an integral power of two between 2 and 256 inclusive. the amount of phase jitter exhibited by the synthesized clock increases as the synthesized clock frequency approaches clkin?s frequency. as a general guide , the maximum generated dcl should be no greater than one-twentieth of clkin?s fr equency. therefore, given a clki n of 66 mhz, the maximum frequency which can be synthesized with accepta ble jitter is approximately 3.3 mhz. the clock generator uses a 14-bit counter to divide clkin. this limits the reference clock?s minimum frequency to clkin divided by 16,384. to summarize these two points: ? synthesized clock x 20 < clkin(recommended) ? reference clock > clkin / 16,384(required) the control of the clock genera tor block is provided through th e pcsr register detailed in section 13.5.22, ?clock select register (pcsr) .? the process is illustrated by this example. suppose the following: ? cpu clock = 66 mhz ? reference clock = 64 khz ? synthesized clock = 1.024 mhz the appropriate reference clock is sele cted by programming pl clksel[cki1, cki0], section 13.5.22, ?clock select register (pcsr) .? the multiplication factor is 16 (1.024 mhz / 64 khz) and is specified by plclksel[cmult0-2]. the division ratio between the synthesized cloc k (gdcl), 1.024 mhz, and the synthesized frame sync (gen_fsc) must be set. (a gen_fsc of 8 khz is assumed). this division ratio is selected by means of fdiv[2-0]. finally, the cl ock generation block should be taken out of bypass by setting pcsr[nbp].
physical layer interface controller (plic) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 13-12 freescale semiconductor the above settings can be made by a single write of the 16-bit value 0x802b to pcsr. the following restrictions should be obser ved when using the clock generator module: ? the smallest multiplication factor is 2. ? clkin should be significan tly greater than (> 20 times) the synthesized clock. figure 13-11 and figure 13-12 show the connectivity and relationshi p of the timing signals within the plic block. figure 13-11. plic internal timing signal routing figure 13-12. plic clock generator port 0 port 1 port 2 port 3 prog delay 0 prog delay 1 prog delay 2 dcl1 fsc1 prog delay 3 dfsc2 dcl1 dcl1 dfsc2 dfsc3 dcl1/gdcl1_out fsc1/fsr1/dfsc1 p1cr[m/s] dcl0/urt1_clk pa 8 / f s c 0 / f s r 0 gci/idl gci/idl gci/idl gci/idl dcl0 dfsc0 sfsc gen fsc0 fsc1 p1cr[fsm] p0cr[m2-m0] 2-khz to cpu dfsc1 dfsc0 pin mux 0 pin mux 1 p0sdr[15:0] p1sdr[15:0] dfsc3 p2sdr[15:0] p3sdr[15:0] mux multiply block divider block gen_fsc gdcl cki[1:0] cmult[2:0] fdiv[2:0] dcl0/urt1_clk o192k pa 8 / f s c 0 / f s r 0
physical layer interface controller (plic) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 13-13 13.3.2 super frame sync generation figure 13-11 shows the generation of the 2- khz super frame sync. the choice of either fsc0 or fsc1 is possible using p1cr[fsm]. this allows either the port 0 or port 1 timing to be used to generate the 2-khz super frame sync interrupt. the sfsc block then divides this accordingl y. when p1cr[fsm] is set, fsc1 is the source of the super frame sync. in case p1cr[ms] is 0 (that is , port 1 is in slave mode), the interrupt is ultimately driven by an external source. in case the m/s bit is 1 (tha t is, port 1 is in master mode), fsc1 ultimately comes from port 0. 13.3.3 frame sync synthesis figure 13-11 illustrates the relationships between the va rious frame sync clocks. dfsc1 is generated through programmable delay 1 referenced to dfsc0. dfsc2 and dfsc3 are generated through programmable delays 2 and 3 referenced to dfsc1. note well the following: ? p0sdr settings affect dfsc[0?3] ? p1sdr settings affect dfsc[1?3] ? p2sdr settings affect only dfsc2 ? p3sdr settings affect only dfsc3 13.4 plic register memory map table 13-1 lists the plic registers with their offset address from mbar and their default value on reset. table 13-1. plic module memory map mbar offset [31:24] [23:16] [15:8] [7:0] 0x0300 port0 b1 data receive (p0b1rr) 0x0304 port1 b1 data receive (p1b1rr) 0x0308 port2 b1 data receive (p2b1rr) 0x030c port3 b1 data receive (p3b1rr) 0x0310 port0 b2 data receive (p0b2rr) 0x0314 port1 b2 data receive (p1b2rr) 0x0318 port2 b2 data receive (p2b2rr) 0x031c port3 b2 data receive (p3b2rr) 0x0320 port0 d data receive (p0drr) port1 d data receive (p1drr) port2 d data receive (p2drr) port3 d data receive (p3drr) 0x0328 port0 b1 data transmit (p0b1tr) 0x032c port1 b1 data transmit (p1b1tr) 0x0330 port2 b1 data transmit (p2b1tr) 0x0334 port3 b1 data transmit (p3b1tr) 0x0338 port0 b2 data transmit (p0b2tr) 0x033c port1 b2 data transmit (p1b2tr)
physical layer interface controller (plic) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 13-14 freescale semiconductor 0x0340 port2 b2 data transmit (p2b2tr) 0x0344 port3 b2 data transmit (p3b2tr) 0x0348 port0 d data transmit (p0dtr) port1 d data transmit (p1dtr) port2 d data transmit (p2dtr) port3 d data transmit (p3dtr) 0x0350 port0 gci/idl configuration register (p0 cr) port1 gci/idl configuration register (p1cr) 0x0354 port2 gci/idl configuration register (p2 cr) port3 gci/idl configuration register (p3cr) 0x0358 port0 interrupt configuration register (p0i cr) port1 interrupt configur ation register (p1icr) 0x035c port2 interrupt configuration register (p2i cr) port3 interrupt configur ation register (p3icr) 0x0360 port0 gci monitor rx (p0gmr) port1 gci monitor rx (p1gmr) 0x0364 port2 gci monitor rx (p2gmr) port3 gci monitor rx (p3gmr) 0x0368 port0 gci monitor tx (p0gmt ) port1 gci monitor tx (p1gmt) 0x036c port2 gci monitor tx (p2gmt) port3 gci monitor tx (p3gmt) 0x0370 reserved gci monitor tx status (pgmts) gci monitor tx abort (pgmta) reserved 0x0374 port0 gci c/i rx (p0gcir) port1 gci c/i rx (p1gcir) port2 gci c/i rx (p2gcir) port3 gci c/i rx (p3gcir) 0x0378 port0 gci c/i tx (p0gcit) port1 gci c/i tx (p1gcit) port2 gci c/i tx (p2gcit) port3 gci c/i tx (p3gcit) 0x037c reserved gci c/i tx status (pgcitsr) 0x0383 reserved gci c/i d-channel status (pdcsr) 0x0384 port0 periodic status (p0psr) port1 periodic status (p1psr) 0x0388 port2 periodic status (p2psr) port3 periodic status (p3psr) 0x038c aperiodic interrupt status register (pasr) reserved loop back control (plcr) 0x0390 reserved d-channel request (pdrqr) 0x0394 port0 sync delay (p0sdr) port1 sync delay (p1sdr) 0x0398 port2 sync delay (p2sdr) port3 sync delay (p3sdr) 0x039c reserved clock select (pcsr) table 13-1. plic module memory map (continued) mbar offset [31:24] [23:16] [15:8] [7:0]
physical layer interface controller (plic) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 13-15 13.5 plic registers any bits in the following registers marked 0 have no function. when the re gister is a read /write register, these bits should be cleared. some registers are described that control more than one port. in these cases, pare ntheses indicates to which port the control bits relate; for exampl e, lm0(0) is the lm0 bit for port 0. 13.5.1 b1 data receive re gisters (p0b1rr?p3b1rr) all bits in these registers are read only and are set on hardware or software reset. the p n b1rrs contain the last four fram es of data received on channel b1 . (p0b1rr is the b1 channel data for port 0, p1b1rr is b1 for port 1, and so on.) the data are packed from the least significant byte (lsb), up to the most significant byte (msb). these registers are aligned on longword boundaries from mbar + 0x300 for p0b1rr to mbar + 0x30c for p3b1rr. see section 13.2.3, ?gci/idl b- an d d-channel bit alignment ,? for the frame and bit alignment within the 32-bit word. 31 24 23 16 field frame 0 frame 1 reset 1111_1111 1111_1111 r/w read only 15 8 7 0 field frame 2 frame 3 reset 1111_1111 1111_1111 r/w read only addr mbar + 0x300 (p0b1rr); 0x304 (p1b1rr); 0x308 (p2b1rr); 0x30c (p3b1rr) figure 13-13. b1 receive da ta registers p0b1rr?p3b1rr
physical layer interface controller (plic) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 13-16 freescale semiconductor 13.5.2 b2 data receive re gisters (p0b2rr?p3b2rr) all bits in these registers are read only and are set on hardware or software reset. the p n b2rr registers contain the last four frames of data received on channel b2 . (p0b2rr is the b2 channel data for port 0, p1b2rr is b2 for port 1, a nd so on.) the data are packed from lsb to msb. these registers are aligned on long-word boundaries from mbar + 0x310 for p0b2rr to mbar + 0x31c for p3b2rr. see section 13.2.3, ?gci/idl b- an d d-channel bit alignment ,? for the frame and bit alignment within the 32-bit word. figure 13-14 shows the b2 receive data registers. 13.5.3 d data receive registers (p0drr?p3drr) all bits in these registers are read-only a nd are set on hardware or software reset. the p n drr registers contain the last four frames of d-channel receive data packed from the least significant bit, (lsb), to the most significant bit, (msb), for each of the four physical por ts on the MCF5272. p0drr is the d-channel byte for port 0, p1 drr the d channel for port 1, and so on. each of the four byte-addres sable registers, p0drr-p3drr , are packed to form one 32-bit register, p n drr, located at mbar + 0x320. p0drr is located in the msb of the p n drr register, p3drr is located in the lsb of the p n drr register. 31 24 23 16 field frame 0 frame 1 reset 1111_1111 1111_1111 r/w read only 15 8 7 0 field frame 2 frame 3 reset 1111_1111 1111_1111 r/w read only addr mbar + 0x310 (p0b2rr); 0x314 (p1b2rr); 0x318 (p2b2rr); 0x31c (p3b2rr) figure 13-14. b2 receive data registers p0b2rr ? p3b2rr 31 24 23 16 field p0drr p1drr reset 1111_1111 1111_1111 r/w read only 15 8 7 0 field p2drr p3drr reset 1111_1111 1111_1111 r/w read only addr mbar + 0x320 (p0drr); 0x321 (p 1drr); 0x322 (p2drr); 0x323 (p3drr) figure 13-15. d receive data registers p0drr?p3drr
physical layer interface controller (plic) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 13-17 13.5.4 b1 data transmit registers (p0b1tr?p3b1tr) all bits in these registers are read/write and are set on hardware or software reset. the p n b1tr registers contain four fram es of transmit data for channel b1. (p0b1tr is the b1 channel transmit data for port 0, p1b1tr is b1 transmit for port 1, and so on.) the data are packed from lsb to msb. these registers are aligned on long-word boundaries from mbar + 0x328 for p0b1tr to mbar + 0x334 for p3b1tr. see section 13.2.3, ?gci/idl b- and d-channel bit alignment ,? for the frame and bit alignment within the 32-bit word. 13.5.5 b2 data transmit registers (p0b2tr?p3b2tr) all bits in these registers are read/write and are set on hardware or software reset. the p n b2tr registers contain four fram es of transmit data for port n of channel b2. (p0b2tr is the b2 channel transmit data for port 0, p1b2tr is b2 transmit for por t 1, and so on.) the data are packed from lsb to msb. these registers are aligned on long-word boundaries from mbar + 0x338 for p0b2tr to mbar + 0x344 for p3b2tr. please refer to section 13.2.3, ?gci/idl b- an d d-channel bit alignment ? for the frame and bit alignm ent within the 32-bit word. 31 24 23 16 field frame 0 frame 1 reset 1111_1111 1111_1111 r/w read/write 15 8 7 0 field frame 2 frame 3 reset 1111_1111 1111_1111 r/w read/write addr mbar + 0x328 (p0b1tr); 0x32c (p1b 1tr); 0x330 (p2b1tr); 0x334 (p3b1tr) figure 13-16. b1 transmit data registers p0b1tr?p3b1tr 31 24 23 16 field frame0 frame1 reset 1111_1111 1111_1111 r/w read/write 15 8 7 0 field frame2 frame3 reset 1111_1111 1111_1111 r/w read/write addr mbar + 0x338 (p0b2tr); 0x33c (p1b 2tr); 0x340 (p2b2tr); 0x344 (p3b2tr) figure 13-17. b2 transmit data registers p0b2tr?p3b2tr
physical layer interface controller (plic) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 13-18 freescale semiconductor 13.5.6 d data transmit registers (p0dtr?p3dtr) all bits in these registers are read/write and are set on hardware or software reset. the pltd registers contain four fram es of d-channel transmit data, pa cked from lsb to msb, for each of the four physical ports on the MCF5272. p0dtr is th e d-channel byte for port 0, p1dtr the d channel for port 1, and so on. the four byte-addressable 8-bit regi sters, p0dtr?p3dtr, are packed to form one 32-bit register, pltd. pltd is aligned on a long-word boundary at mbar + 0x348 and can be read as a single 32-bit register. p0dtr is located in the msb of the pltd register, p3dtr is located in the lsb of the pltd register. 13.5.7 port configuratio n registers (p0cr?p3cr) p n cr are registers containing conf iguration information for each of the four ports on the MCF5272. all bits in these registers are read/write a nd are cleared on hardware or software reset. 31 24 23 16 field p0dtr p1dtr reset 1111_1111 1111_1111 r/w read/write 15 8 7 0 field p2dtr p3dtr reset 1111_1111 1111_1111 r/w read/write addr mbar + 0x348 (p0dtr); 0x349 (p1dtr); 0x34a (p2dtr); 0x34b (p3dtr) figure 13-18. d transmit data registers p0dtr?p3dtr 15 14 12 11 10 9 8 7 6 5 4 3 2 1 0 p0cr on/off m ? g/s ? act ? ? ? ? shb2 shb1 enb2 enb1 p1cr on/off ? m m/s g/s fsm act ? ? ? ? shb2 shb1 enb2 enb1 p2cron/off? ? ?????????shb2shb1enb2enb1 p3cr on/off ? ? ? ? ? ? ? dmx ? ? ? shb2 shb1 enb2 enb1 reset 0000_0000_0000_0000 r/w read/write addr mbar + 0x350 (p0cr); 0x352 (p1cr); 0x354 (p2cr); 0x356 (p3cr) figure 13-19. port configuration registers (p0cr?p3cr)
physical layer interface controller (plic) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 13-19 table 13-2. p0cr?p3cr field descriptions bits name description 15 on/off 0 port is off and in a steady state condition. in th is state, the b and d channels on the transmit side are high impedance when in gci/idl. the receive registers are all set. in idl and gci modes with the port in this state, all periodic and aperiodic in terrupts associated with the port are disabled. 1 switches on the port for operation in the configured mode. 14?12 m mode. selects between various modes of operation as described below. note: bit 14 is relevant to port 0 only. the idl modes on the plic only support short frame sync. port 1-3 port 0 000 idl8idl8 001 idl10idl10 010 gcigci 011 reservedreserved 10 x reservedreserved 11 x reservedreserved 11 m/s master/slave. defines the direction of the dcl1 and fsc1 pins. 0 dcl1 and fsc1 are inputs and are sourced from an external master. note: this bit is relevant to port 1 only, as port 0 is always in slave mode. 1 enables dcl1 and fsc1 to be outputs, that is, the MCF5272 drives dcl1 and fsc1. 10 g/s gci/scit. 0 the normal mode of gci is used (i.e. no d-channel contention control). 1 selects scit mode of operation for the gci interfaces. 9 fsm frame sync master. 0 default reset value. 2-khz interrupt is generated from port 0. 1 port 1 fsc/fsr is used to generate the 2-khz interrupt. 8 act gci activation. 0 default reset value. 1 causes dout to transition to a logic low for the respec tive port. this bit is only operational when the port is in gci mode. setting the act bit in any other mode ha s no effect. it is the responsibility of the cpu to clear the act bit when normal operation on dout is r equired. this bit is intended to be used to request activation from the upstream dcl/fsc driver. periodic interrupts commence as soon as the upstream device generates dcl, provided the appropriate interr upts, such as ie, b1rie, and so on, are enabled for the port. 7 dmx data multiplex. 0 port 3 dout and din are multiplexed onto dout1 and din1. 1 enables port 3 dout and din to be connected to dedicated output and input pins, dout3 and din3. 3 shb2 b2 channel shift direction. 0 b2 channel data is received/transmitted msb first. the msb-first convention is often used for communication with pcm codecs and converters. 1 b2 channel data is received/transmitted lsb first. the lsb-first convention is used when the data is to be hdlc encoded. 2 shb1 b1 channel shift direction. see shb2. 1 enb2 enable b2 data channel. 0 the b2 channel is disabled and all periodic interrupts in both receive and transmit directions are disabled. the behavior of din and dout in this state is shown below. 1 enables the b2 data channel for the respective port. 0 enb1 enable b1 data channel. see enb2. mode din dout idl all 1s high impedance gci operational (data on din visible) open drain
physical layer interface controller (plic) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 13-20 freescale semiconductor 13.5.8 loopback cont rol register (plcr) all bits in this register are clear ed on hardware or software reset. the plcr is an 8-bit register cont aining the configuration informati on for all four por ts on the MCF5272. note in loopback mode, the respective port must be enabled (using p n cr[on/off]) along with the b1 and b2 channels (using p n cr[enb1, enb2]) and the d channel (using pdrq r[dcnti] when in idl mode, for instance). also, if more than one of ports 1, 2, or 3 are programmed in loopback mode, it is necessary to program the appropriate frame sync function using the sync dela y registers discussed in section 13.5.21, ?sync delay registers (p0sdr?p3sdr) .? 13.5.9 interrupt configuration registers (p0icr?p3icr) all bits in these registers are read/write a nd are cleared on hardware or software reset. the p n icr registers contain interrupt configuration bi ts for each of the four ports on the MCF5272. 76543210 field lm3 lm2 lm1 lm0 reset 0000_0000 r/w read/write addr mbar + 0x38f figure 13-20. loopback control register (plcr) table 13-3. plcr field description bits name description 7-6 lm3 loopback mode control, port 3. 00 normal 01 auto-echo 10 local loopback 11 remote loopback 5-4 lm2 loopback mode control, port 2. see lm3. 3-2 lm1 loopback mode control, port 1. see lm3. 1-0 lm0 loopback mode control, port 0. see lm3. 15 14 12 11 10 9 8 7 6 5 4 3 2 1 0 plcir0?3 ie ? gcr gct gmr gmt ? dtie b2tie b1tie drie b2rie b1rie reset 0000_0000_0000_0000 r/w read/write addr mbar + 0x0358 (p0icr); 0x035a (p 1icr); 0x035c (p2icr); 0x035e (p3icr) figure 13-21. interrupt configuration registers (p0icr?p3icr)
physical layer interface controller (plic) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 13-21 table 13-4. p0icr?p3icr field descriptions bits name description 15 ie interrupt enable. allows the port to generate interrupts to the cpu. when cleared, the ie bit masks all periodic and aperiodic interrupts associated with the respective port. 14?12 ? reserved, should be cleared. 11 gcr interrupt enable for the c/i channel receive. 0 interrupt masked 1 interrupt enabled. when set, an interrupt is enabled which occurs when the corresponding gcr status bit is set. 10 gct c/i channel transmit interrupt enable. 0 interrupt masked 1 interrupt enabled. 9 gmr interrupt enable for the monitor channel receive. 0 interrupt masked 1 interrupt enabled. 8 gmt interrupt enable for the monitor channel transmit. 0 interrupt masked 1 interrupt enabled. 7?6 ? reserved, should be cleared. 5 dtie d transmit interrupt enable. 0 interrupt masked 1 interrupt enabled.interrupt occurs when the corresponding p n psr[dtde] or p n psr[dtue] is set. 4 b2tie b2 transmit interrupt enable. 0 interrupt masked 1 interrupt enabled. interrupt occurs when the corresponding p n psr[b2tde] or p n psr[b2tue] is set. 3 b1tie b1 transmit interrupt enable. 0 interrupt masked 1 interrupt enabled. interrupt occurs when the corresponding p n psr[b1tde] or p n psr[b1tue] is set. 2 drie d receive interrupt enable. 0 interrupt masked 1 interrupt enabled. interrupt occurs when the corresponding p n psr[drdf] or p n psr[droe] is set. 1 b2rie b2 receive interrupt enable. 0 interrupt masked 1 interrupt enabled. interrupt occurs when the corresponding p n psr[b2rdf] or p n psr[b2roe] is set. 0 b1rie b1 receive interrupt enable. 0 interrupt masked 1 interrupt enabled.interrupt o ccurs when the corresponding p n psr[b1rdf] or p n psr[b1roe] is set.
physical layer interface controller (plic) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 13-22 freescale semiconductor 13.5.10 periodic status registers (p0psr?p3psr) all bits in these registers are read only and are set on hardware or software reset. p n psr are 16-bit registers containing the interrupt status in formation for the b- and d-channel transmit and receive registers for each of the four ports on the MCF5272. 15 12 11 10 9 8 7 6 5 4 3 2 1 0 p0psr?3 ? dtue b2tue b1tue droe b2roe b1roe dtde b2tde b1tde drdf b2rde b1rdf reset 0000_0000_0000_0000 r/w read only addr mbar + 0x384 (p0psr); 0x386 (p1psr); 0x388 (p2psr); 0x38a (p3psr) figure 13-22. periodic status registers (p0psr?p3psr) table 13-5. p0psr?p3psr field descriptions bits name description 15?12 ? reserved, should be cleared. 11 dtue d data transmit underrun error. this bit is set when the data in the pltd transmit data register for the respective port was transferred to the transmit shad ow register, which was already empty indicated by dtde. dtue is automatically cleared, when the p n psr register has been read by the cpu. 10 b2tue b2 data transmit underrun error. this bit is set when the data in the p n b2tr transmit data register for the respective port was transferred to the transmit shadow register, which was already empty indicated by b2tde. b2tue is automa tically cleared when the p n psr register has been read by the cpu. 9 b1tue b1 data transmit underrun error. this bit is set when the data in the p n b1tr transmit data register for the respective port was transferred to the transmit shadow register, which was already empty indicated by b1tde. b1tue is automa tically cleared when the p n psr register has been read by the cpu. 8 droe d-channel data receive overrun error. this bit is set when the data in the d receive shadow register for the respective port has been transferred to the receive data register p n drr, which was already full indicated by drdf. droe is automatically cleared when the p n psr register has been read by the cpu. 7 b2roe b2 data receive overrun error. this bit is set when the data in the b2 receive shadow register for the respective port has been transferred to the receive data register p n b2rr, which was already full indicated by b2rdf. b2roe is automatically cleared when the p n psr register has been read by the cpu. 6 b1roe b1 data receive overrun error. this bit is set when the data in the b1 receive shadow register for the respective port has been transferred to the receive data register p n b1rr, which was already full indicated by b1rdf. b1roe is automatically cleared when the p n psr register has been read by the cpu. note: overrun and underrun conditions are ca used by the b and/or d-channel receive or transmit data registers not being read or written prior to a 2-khz super frame arriving. 5 dtde d data transmit data empty. this bit is set wh en the data in the pltd tran smit data register for the respective port has been transferred to the transmit shadow register. this bit is cleared when the cpu writes data to pltd. 4 b2tde b2 data transmit data empty. this bit is set when the data in the p n b2tr transmit data register for the respective port has been transferred to the transmit shadow register. this bit is cleared when the cpu writes data to p n b2tr. 3 b1tde b1 data transmit data empty. this bit is set when the data in the p n b1tr transmit data register for the respective port has been transferred to the transmit shadow register. this bit is cleared when the cpu writes data to p n b1tr.
physical layer interface controller (plic) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 13-23 13.5.11 aperiodic status register (pasr) all bits in this register are read only a nd are set on hardware or software reset. the pasr register is a 16-bit regist er containing the aperiodi c interrupt status info rmation for the c/i and monitor channel transmit a nd receive registers for al l four ports on the mcf52 72. an aperiodic interrupt condition remains asserted as long as any one of the bits within the pasr register is set. 2 drdf d receive data full. this bit indicates that the d re ceive data register for the respective port is full. drdf is cleared when the cpu r eads the receive data register p n drr. 1 b2rdf b2 receive data full. this bit indicates that the b2 receive data register for the respective port is full. b2rdf is cleared when the cpu reads the receive data register p n b2rr. 0 b1rdf b1 receive data full. this bit indicates that the b1 receive data register for the respective port is full. b1rdf is cleared when the cpu reads the receive data register p n b2rr. 1514131211109876543210 field gcr 3 gct 3 gmr 3 gmt 3 gcr 2 gct 2 gmr 2 gmt 2 gcr 1 gct 1 gmr 1 gmt 1 gcr 0 gct 0 gmr 0 gmt 0 reset 0000_0000_0000_0000 r/w read only addr mbar + 0x38c figure 13-23. aperiodic status register (pasr) table 13-6. pasr field descriptions bits name description 15, 11, 7, 3 gcr n gci c/i received. when set, this bit indicates that valid new data has been written to a gci c/i receive register. an interrupt is queued when this bit is set if the gcr interrupt enable bit has been set in the corresponding p n icr register. the gcr bit and associated interrupt are automatically cleared wh en the corresponding p n gcir register has been read by the cpu. 14, 10, 6, 2 gct n gci c/i transmitted. when set, this bit indicates that a c/i register is empty. an interrupt is queued when this bit is set if the gct interrupt enable bit has been set in the corresponding p n icr register. the gct bit and associated in terrupt are automatical ly cleared when the pgcitsr register has been read by the cpu. 13, 9, 5, 1 gmr n gci monitor received. when set, this bit indicates that data has been written to a monitor channel receive register. an interrupt is queued wh en this bit is set if the gmr interrupt enable bit has been set in the corresponding p n icr register. the gmr bit and associated interrupt are automatically cleared wh en the corresponding p n gmr register has been read by the cpu. 12, 8, 4, 0 gmt n gci monitor transmitted. when se t, this bit indicates that the monitor channel transmit register is empty. an interrupt is queued when this bit is set if the gmt interrupt enable bit has been set in the corresponding p n icr register. the gmt bit and associated interrupt are automatically cleared when the pgmts register has been read by the cpu. table 13-5. p0psr?p3psr field descriptions bits name description
physical layer interface controller (plic) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 13-24 freescale semiconductor 13.5.12 gci monitor channel r eceive registers (p0gmr?p3gmr) all bits in these registers are read only and are initialized to 0x00ff on hardwa re or software reset. p n gmr are 16-bit registers containing th e received monitor channel bits fo r each of the f our receive ports on the MCF5272. a byte of monitor channel data received on a certain port is put into an as sociated register using the format shown in figure 13-24 . a maskable interrupt is generated when a byte is written into any of these four registers. 15 11 10 9 8 7 0 field ? eom ab mc m reset 0000_0000_1111_1111 r/w read only addr mbar + 0x360 (p0gmr); 0x362 (p1gmr ); 0x364 (p2gmr); 0x366 (p3gmr) figure 13-24. gci monitor channel receive registers (p0gmr?p3gmr) table 13-7. p0gmr?p3gmr field descriptions bits name description 15?11 ? reserved, should be cleared. 10 eom end of message. 0 default at reset. 1 indicates to the cpu that an end-of-message condit ion has been recognized on the e bit. eom is automatically cleared when the p n gmr register has been read by the cpu. 9 ab abort. 0 default at reset. 1 indicates that the gci controller has recogni zed an abort condition and is acknowledging the abort. it is automatically cleared by the cpu when the p n gmr register has been read. 8 mc monitor change. 0 default at reset. 1 indicates to the cpu that the monitor channel data byte written to the respective p n gmr register has changed and that the data is available for proc essing. automatically cleared by the cpu when the p n gmr register has been read. clearing this bit by reading this register also clears the aperiodic gmr interrupt. 7?0 m monitor channel data byte.
physical layer interface controller (plic) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 13-25 13.5.13 gci monitor channel tr ansmit registers (p0gmt?p3gmt) all bits in these registers are read/write a nd are cleared on hardware or software reset. the p n gmt registers are 16 bi t register containing the control and monitor channel bits to be transmitted for each of the four ports on the MCF5272. a byte of monitor channel data to be transmitted on a certain port is put into an associated register using the format shown in figure 13-25 . a maskable interrupt is generated when this byte of data has been successfully transmitted. 15 10 9 8 7 0 field ? l r m reset 0000_0000_0000_0000 r/w read/write addr mbar + 0x368 (p0gmt); 0x36a (p1gmt ); 0x36c (p2gmt); 0x36e (p3gmt) figure 13-25. gci monitor channel transmit registers (p0gmt?p3gmt) table 13-8. p0gmt?p3gmt field descriptions bits name description 15?10 ? reserved, should be cleared. 9llast. 0 default reset value 1 set by the cpu. indicates to the monitor channel cont roller to transmit the end of message signal on the e bit. both p n gmt[l] and p n gmt[r] must be set for the monitor channel controller to send the end of message signal. p n gmt[m7:0] are ignored and 0xff is s ent with the end of message condition necessitating sending the monitor channel information using p n gmt[r] to control the monitor channel transmitter, followed at the end of the frame by setting p n gmt[l] and p n gmt[r]. the l bit is automatically cleared by the gci controller. 8 r ready. 0 default reset value. 1 set by the cpu. indicate to the monitor channel contro ller that a byte of data is ready for transmission. automatically cleared by the gci controller when it generates a transmit acknowledge (ack bit in pgmts register) or when the l bit is reset. 7?0 m monitor channel data byte. written by the cpu when a byte is ready for transmission.
physical layer interface controller (plic) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 13-26 freescale semiconductor 13.5.14 gci monitor channel tran smit abort register (pgmta) all bits in this register are read/write a nd are cleared on hardware or software reset. the pgmta register contains the abort control bits for each of the four ports on the MCF5272 for the transmit monitor channel. 76543 0 field ar3 ar2 ar1 ar0 ? reset 0000_0000 r/w read/write addr mbar + 0x372 figure 13-26. gci monitor channel transmit abort register (pgmta) table 13-9. pgmta field descriptions bits name description 7 ar3 abort request, port 3. 0 default reset value. 1 set by the cpu, this bit causes t he monitor channel controller to transmit the end of message signal on the e bit. automatically cleared by the monitor channel co ntroller on receiving an abort, that is, when pgmts[ab] is set. 6 ar2 abort request, port 2. see ar3. 5 ar1 abort request, port 1. see ar3. 4 ar0 abort request, port 0. see ar3. 3?0 ? reserved, should be cleared.
physical layer interface controller (plic) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 13-27 13.5.15 gci monitor channel tran smit status register (pgmts) all bits in this register are read only a nd are cleared on hardware or software reset. the pgmts register contains the mon itor channel status bits for each of the four transmit ports on the MCF5272. 76543210 field ack3 ack2 ack1 ack0 ab3 ab2 ab1 ab0 reset 0000_0000 r/w read only addr mbar + 0x371 figure 13-27. gci monitor channel transmit status register (pgmts) table 13-10. pgmts field descriptions bits name description 7 ack3 acknowledge, port 3. 0 default reset value. 1 indicates to the cpu that the gci controller has tr ansmitted the previous monitor channel information. automatically cleared by the cpu reading the register. the clearing of this bit by reading this register also clears the aperiodic gmt interrupt. 6 ack2 acknowledge, port 2. see ack3. 5 ack1 acknowledge, port 1. see ack3. 4 ack0 acknowledge, port 0. see ack3. 3 ab3 abort, port 3. 0 default reset value. 1 indicates to the cpu that the gci controller has abor ted the current message. this bit is automatically cleared by the cpu reading the register. when the gci controller sets this bit, it also clears the ar bit in the pgmta register, the ack bit in the gmts register, and the l and r bits in the p n gmt register. 2 ab2 abort, port 2. see ab3. 1 ab1 abort, port 1. see ab3. 0 ab0 abort, port 0. see ab3.
physical layer interface controller (plic) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 13-28 freescale semiconductor 13.5.16 gci c/i channel recei ve registers (p0gcir?p3gcir) all bits in these registers are read only a nd are cleared on hardware or software reset. the p n gcir registers contain the receiv ed c/i bits for one of each of the four ports on the MCF5272. 31 29 28 27 26 25 24 23 21 20 19 18 17 16 field ? f c3c2c1c0 ? f c3c2c1c0 chan p0gcir p1gcir reset 0000_0000_0000_0000 r/w read only 15 13 12 11 10 9 8 7 5 4 3 2 1 0 field ? f c3c2c1c0 ? f c3c2c1c0 chan p2gcir p3gcir reset 0000_0000_0000_0000 r/w read only addr mbar + 0x374 (p0gcir), 0x375 (p1gci r), 0x376 (p2gcir), 0x377 (p3gcir) figure 13-28. gci c/i channel receive registers (p0gcir?p3gcir) table 13-11. p0gcir?p3gcir field descriptions bits name description 31?29, 23?21, 15?13, 7?5 ? reserved, should be cleared. 28, 20, 12, 4 f full. this bit is set by the c/i channel cont roller to indicate to the cpu that new c/i channel data has been received and is available for processing. it is automatically cleared by a cpu read. the clearing of this bit by reading this register also clears the aperiodic gcr interrupt. 27?24, 19?16, 11?8, 3?0 c3?c0 c/i bits. these four bits are received on the gc i or scit channel 0. when a change in the c/i data value is received in two successive frames, it is interpreted as being valid and is passed on to the cpu, via this register. a maskable interrupt is ge nerated when data is writt en into any of the four available positions.
physical layer interface controller (plic) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 13-29 13.5.17 gci c/i channel transm it registers (p0gcit?p3gcit) all bits in these registers are read/write a nd are cleared on hardware or software reset. the p n gcit registers are 8-bit registers containing the monitor ch annel bits to be tran smitted for each of the four ports on the MCF5272. 31 29 28 27 26 25 24 23 21 20 19 18 17 16 field ? r c3c2c1c0 ? r c3c2c1c0 chan p0gcit p1gcit reset 0000_0000_0000_0000 r/w read/write 15 13 12 11 10 9 8 7 5 4 3 2 1 0 field ? r c3c2c1c0 ? r c3c2c1c0 chan p2gcit p3gcit reset 0000_0000_0000_0000 r/w read/write addr mbar + 0x378 (p0gcit), 0x379 (p1g cit), 0x37a (p3gcit), 0x37b (p4gcit) figure 13-29. gci c/i channel transmit registers (p0gcit?p3gcit) table 13-12. p0gcit?p3gcit field descriptions bits name description 31?29, 23?21, 15?13, 7?5 ? reserved, should be cleared. 28, 20, 12, 4 r ready. this bit is set, by the cpu to indi cate to the c/i channel controller that data is ready for transmission. the transition of this bit from a 0 to a 1 starts the c/i state machine which responds with the ack bit once transmission of two su ccessive c/i words is co mplete. this bit is automatically cleared by the gci controller when it generates a transmit acknowledge (ack bit in pgcitsr register). the clearing of this bit by re ading this register also clears the aperiodic gct interrupt. 27?24, 19?16, 11?8, 3?0 c3?c0 c/i bits. the cpu writes c/i data to be transmitted, on the gci or scit channel 0, into these positions. the cpu must ensure that this data is not overwritten before it has been transmitted the required minimum amount of times, that is, so an y change is detected and confirmed by a receiver. a maskable interrupt is generated when this data has been successfully transmitted
physical layer interface controller (plic) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 13-30 freescale semiconductor 13.5.18 gci c/i channel transmit status register (pgcitsr) all bits in this register are read only a nd are cleared on hardware or software reset. the pgcitsr register is an 8-bit re gister containing the c/i channel st atus bits for each of the four transmit ports on the MCF5272. 7 43210 field ? ack3 ack2 ack1 ack0 reset 0000_0000 r/w read only addr mbar + 0x37f figure 13-30. gci c/i channel transmit status register (pgcitsr) table 13-13. pgcitsr field descriptions bits name description 7?4 ? reserved, should be cleared. 3 ack3 acknowledge, port 3. 0 default reset value. 1 set by the c/i channel controller to indicate that the previous c/i data has been transmitted in two successive c/i words. the ack bit is auto matically cleared by the cpu when the pgcitsr register has been read. 2 ack2 acknowledge, port 2. see ack3. 1 ack1 acknowledge, port 1. see ack3. 0 ack0 acknowledge, port 0. see ack3.
physical layer interface controller (plic) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 13-31 13.5.19 d-channel status register (pdcsr) all bits in this register are read only and are cleared on hardware or soft ware reset. the register is also cleared after a read operation. the pdcsr register contains the d-channel status bits fo r all four ports on the MCF5272. 7 6543210 field ? dg1 dg0 dc3 dc2 dc1 dc0 reset 0000_0000 r/w read only addr mbar + 0x383 figure 13-31. d-channel status register (pdcsr) table 13-14. pdcsr field descriptions bits name description 7?6 ? reserved, should be cleared. 5 dg1 d-channel grant, port 1. 0 default reset value. 1 in idl mode, indicates the status of dgrant. when the external dgnt has a logic 1, the corresponding dg1/dg0 bit is set. in gci mode, dg 1 and dg0 reflects the inverted value of the scit bit. the significance of this bit is the same in idl or gci mode, that is, in idl mode when the dg bit is set, the d channel is granted. in gci mode when the dg bit is set, this corresponds to the go condition. in both cases the d channel is granted and communication may commence. 4 dg0 d-channel grant, port 0. see dg1. 3 dc3 d-channel change, port 3. 0 default reset value. 1 indicates that a value other than 0xff (all ones) exists the d-channel receive register. 2 dc2 d-channel change, port 2. see dc3. 1 dc1 d-channel change, port 1. see dc3. 0 dc0 d-channel change, port 0. see dc3.
physical layer interface controller (plic) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 13-32 freescale semiconductor 13.5.20 d-channel request register (pdrqr) all bits in this read/write register ar e cleared on hardware or software reset. the pdrqr register contains d-channel control bits for all four ports on the MCF5272. 15 12 11 10 9 8 7 2 1 0 field ? shdd(1) dcnti(1) shdd(0) dcnti(0) ? drq reset 0000_0000_0000_0000 r/w read/write addr mbar + 0x392 figure 13-32. d-channel request registers (pdrqr) table 13-15. pdrqr field descriptions bits name description 15?12 ? reserved, should be cleared. 11, 9 shdd d-channel shift direction. 0 d-channel data is msb first. the first bit received is assumed to be the most significant bit and is loaded into the msb position of the d-channel receive register for the respective port. shdd(1) configures the shift direction for ports 1, 2 and 3, shdd(0) configures the shift direction for port 0. 1 d-channel data is lsb first for the d channel. the first bit received is assumed to be the least significant bit and is loaded into the lsb posi tion of the d-channel receive register for the respective port. 10, 8 dcnti d-channel control ignore. allows the d-channel contention function to be ignored. 00 contention active on both ports 01 ignore contention on port 0 10 ignore contention on port 1 11 ignore contention on both ports 7?2 ? reserved, should be cleared. 1?0 drq the value written to these bits is driven ont o the dreq pins associated with port 0 and port 1. when set, a logic high, 1, is driven on to the corresponding pin.
physical layer interface controller (plic) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 13-33 13.5.21 sync delay registers (p0sdr?p3sdr) all bits in these registers are read/write a nd are cleared on hardware or software reset. the p n sdr registers contain the frame sync delay bi ts for each of the four ports on the MCF5272. note if a sync delay value of 0 is specified, that is, p n sdr[sd] = 0x000, then the programmable delay block is transpar ent. when bypassed, the input frame sync passes directly to the output, making the frame-sync-width function defined by p n sdr[fsw] unavailable. the 8-bit frame-sync-width should not be confused with long frame sync mode. the plic only supports short fr ame sync in idl8 and idl10 bit modes for interfacing to external transceivers. 15 14 13 10 9 0 field fsw1 fsw0 ? sd reset 0000_0000_0000_0000 r/w read/write addr mbar + 0x394 (p0sdr); 0x396 (p1sdr); 0x398 (p2sdr); 0x39a (p3sdr) figure 13-33. sync delay registers (p0sdr?p3sdr) table 13-16. p0sdr?p3sdr field descriptions bits name description 15?14 fsw[1?0] frame sync width. se ts the width, in clock cycles, of the output frame sync pulse. 00 frame sync width = 1 01 frame sync width = 2 10 frame sync width = 8 11 frame sync width = 16 13?10 ? reserved, should be cleared. 9?0 sd sync delay. range: 0?1023. se ts the delay, in dcl clock cycles, for dfsc3?dfsc0. the delay period should be doubled in gci mode because gc i has two clock cycles per data bit. see section 13.3, ?plic timing generator ,? for further information.
physical layer interface controller (plic) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 13-34 freescale semiconductor 13.5.22 clock select register (pcsr) all bits in this register are read/write a nd are cleared on hardware or software reset. pcsr controls the plic clock generation block. please refer to section 13.3, ?plic timing generator ,? for certain restrictions on the us e of the clock generation block. 15 14 8 7 6 5 3 2 0 field nbp ? cki fdiv cmult reset 0000_0000_0000_0000 r/w read/write addr mbar + 0x39e figure 13-34. clock select register (pcsr) table 13-17. pcsr field descriptions bits name description 15 nbp non-bypass mode select for the clock generation module. 0 the clock generation module is bypassed. g en_fsc and gdcl are connected to fsc0 and dcl0. 1 selects non-bypassed mode. gen_fsc and gdcl are synthesized from the incoming fsc0 or dcl0. 14?8 ? reserved, should be cleared. 7?6 cki clock select input. selects the source clock for the clock generation block. 00 dcl0 01 fsc0 1 x reserved 5?3 fdiv fsc divide. sets the divide ratio between gdcl and gen_fsc. 000 4 001 8 010 16 011 32 100 64 101 128 110 192 111 256 2?0 cmult clock multiplication ratio. sets the ratio of the reference clock frequency to the gdcl frequency. 000 x 2 001 x 4 010 x 8 011 x 16 100 x 32 101 x 64 110 x 128 111 x 256
physical layer interface controller (plic) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 13-35 13.6 application examples this section provides examples for applications. 13.6.1 introduction the following section describes the initialization of the plic ports a nd gives three application examples demonstrating the connection of multiple tr ansceivers or codecs to the plic module. 13.6.2 plic initialization the ports on the plic module of th e MCF5272 require a number of regi sters to be configured after power-on reset and prior to use. the following are the steps necessary for initializing the ports. the port configuration registers, p n cr, and the interrupt c onfiguration register, p n icr, must be initialized before using any port. 13.6.2.1 port configuration example ? specify which ports are active. ? specify the operational modes, idl8, id l10, and so on, for the active ports, p n cr[m]. ? if gci mode is specified in p n cr[m], select whether gci scit mode is to be used, p n cr[g/s] ? if port 1 is used, program whether the 2-khz frame interrupt is to be derived from port 0 or port 1, p n cr[fsm]. ? if port 1 is used, program whether it receives as inputs dcl and fsc or whether it drives these signals as outputs. ? if the port is in gci mode, the p n cr[act] bit may be set if gci activation should be requested. ? if port 3 is used, program the p n cr[dmx] bit if this port is r outed through physical interface 3 (din3/dout3). ? program the shift direction fo r the b1 and b2 channels, p n cr[shb1?shb2], to sp ecify msb or lsb first. ? program p n cr[enb1?enb2] to specify whether b1 or b2 is enabled at initialization. the following example shows a basic confi guration of port 1, assuming the following: ? port 1 is active as slave using idl10 mode ? 2-khz frame interrupt derived from port 1 ? msb first on b1 and b2 ? b1 and b2 disabled.
physical layer interface controller (plic) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 13-36 freescale semiconductor figure 13-35. port 1 configuration register (p1cr) the programming of the p1cr register in the above example is achieved wi th the following coldfire code sequence assuming the equates and in it sections include the following: equates and init: ... module_regs_addr equ 0x00300000 ;address of on-chip registers p1cr equ 0x352 ;offset of p1cr register p1icr equ 0x35a ... move.l #module_regs_addr, a5 ;reference register from a5 ... move.w #0x9200,d0 ;port 1 config on, idl10, slave, port1 fsm ;msb first on b1 and b2, b1 and b2 disabled move.w d0,p1cr(a5) ;write to p1cr register the above code segment is an example only. fsm (port 1 only) scit mode (gci only) slave mode idl10 mode reserved port on reserved b2 msb first b1 msb first b2 disabled b1 disabled 1514131211109876543210 p1cr1001001000000000 0x9200 gci act (gci only)
physical layer interface controller (plic) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 13-37 13.6.2.2 interrupt configuration example the p n icr registers should be configured according to the specific interrupts, periodic and aperiodic, required for each port. in additi on, the port interrupt enable, (p n icr[ie]) should be se t for each active port prior to receiving interrupts. assuming port 1 is configured as in the above exam ple then the following conf iguration would enable periodic interrupts on port 1 with only the d channel active. figure 13-36. port 1 interrupt configuration register (p1icr) the programming of the p1icr in the above example is achieved with the following coldfire code sequence assuming the equates and init secti ons as in the previous p1cr example: ... move.w #0x8024,d0 ; port 1 ie and d-channel interrupts enabled move.w d0,p1icr(a5) ; write value to pnicr ... gci only port 0 only ie enabled reserved dtie enabled b2tie disabled drie enabled b2rie disabled 1514131211109876543210 p1icr1000000000100100 0x8024 b1rie disabled b1tie disabled
physical layer interface controller (plic) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 13-38 freescale semiconductor 13.6.3 example 1: isdn soho pbx with ports 0, 1, 2, and 3 in this example, all four ports are used to connect an external transceiver and six codecs. port 0 and port 1 are programmed in slave mode. an external transceiver, mc145574, is co nnected to port 0. port 1, 2, and 3 are used to connect up to six external pcm codecs. figure 13-37. isdn soho pabx example in the previous example, freescale?s mc14lc 5480 codecs and mc145574 s/t transceiver are shown. the s/t transceiver in this example is connected to port 0 and the fsc0 frame sync signal is used exclusively for synchronizing the data on the transcei ver?s idl interface. codecs 1 and 2 are connected to frame sync 1, fsc1. codecs 3 and 4 are connected to dfsc2 which is th e output of programmable din1 dout1 fsc1 dcl1 mc145574 mc14lc5480 codec 4 codec5 interface 1 dfsc2 dfsc3 codec6 tx dt dt dt dt rx dr dr dr dr codec 3 mc14lc5480 mc14lc5480 mc14lc5480 bclkt bclkt bclkt bclkt fst fst fst fst idl sync idl clk fsr fsr gnd gnd din0 dout0 fsc0 dcl0 interface 0 mc14lc5480 codec 2 dt dt dr dr codec 1 mc14lc5480 bclkt bclkt fst fst fsr fsr gnd vdd dgrant drequest dgnt0 dreq0 MCF5272 bclkr vdd bclkr bclkr vdd fsr vdd bclkr bclkr vdd fsr vdd bclkr
physical layer interface controller (plic) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 13-39 delay 2. programmable dela y 2 generates a delayed frame sync with reference to fsc1. similarly codecs 5 and 6 are connected to dfsc3 which is the output of programma ble delay 3. programmable delay 3 generates a delayed frame sync also wi th reference to fsc1. the mc14lc5480 codecs, when in idl mode, may be programmed using the fsr pin, to select whether the codec is receiving and transmitting on the b1 or the b2 time slot. see the mc14lc5480 data sheet for further information. figure 13-38 shows the idl bus ti ming relationship of the codecs and mc145574 transceiver when in standard idl2 10-bit mode with a common frame sync. figure 13-38. standard idl2 10-bit mode the s/t transceiver is connected to port 0, di n0/dout0. the dcl and fsc generated from the s/t transceiver are connected to dcl0, fsc0, and al so feed port 1, dcl1, a nd fsc1 because port 1 is synchronized to these s/t generated timing signals. the six codecs are connected to din1 and dout1. to provide six discrete 64-kbps channels on the port 1 idl interface, the delayed frame syncs are programmed to synchronize the codecs on non-overlapping time slots. codec 1 transmits and receives in the b1 time slot. codec 2 transmits and receives in the b2 time slot, which st arts 10 dcl cycles later, and so on for the other codecs. co decs 3 and 4 are synchronized to dfsc2 which is generated 20 dcl cycles after fsc1 by loading the programmable dela y 2 register with 0x0014. the dfsc3 signal synchronizes codecs 5 and 6. df sc3 is generated 40 dcl cycles after fsc1 by loading the programmable delay 3 register with 0x0028. only the port 0 d-channel is used in this exam ple; dreq0 and dgnt0 are connected to the s/t transceiver. the gci mode of operation is analogous. in gci mode , port 0 can be configur ed to support the scit channel. b1 b2 mc145574 b4 b5 b6 codec 1 codec 2 codec 3 codec 4 dcl fsc1 dfsc2 dfsc3 din1/ dout1 fsc0 b1 b2 d din0/ dout0 codec5 codec6 b3 d
physical layer interface controller (plic) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 13-40 freescale semiconductor 13.6.4 example 2: isdn soho pbx with ports 1, 2, and 3 in this example, port 0 is not use d. the port 0 pins are multiplexed with uart0 and in this example, port 0 is used to connect to an external transceiver to provide an rs232 inte rface. port 1 is programmed in slave mode and an external u (or s/t) transceiver is conne cted to port 1. port 2 and po rt 3 are used to connect up to four external pcm codecs. figure 13-39. isdn soho pabx example in the above example, freescale?s mc14lc5480 codecs and mc145572 u tran sceiver are shown. the u transceiver in this example is connected to port 1 and the fsc1 fram e sync signal is used exclusively for synchronizing the data on the u tr ansceiver?s idl interface. codecs 1 and 2 are connected to delayed frame sync 2, dfsc2, which is the output of progr ammable delay 2. programma ble delay 2 generates a delayed frame sync with reference to fsc1. similarly codecs 3 and 4 are connected to dfsc3 which is the output of programmable delay 3. programmable dela y 3 generates a delayed frame sync also with reference to fsc1. the mc14lc5480 codecs, when in idl mode, ma y be programmed using the fsr pin to select whether the codec is receiving and tr ansmitting on the b1 or the b2 time slot (see mc14lc5480 data sheet for further information). figure 13-40 shows the idl bus timing relationship of the codecs and u transceiver when in standard idl2 10-bit mode with a common frame sync. uart0 din1 dout1 fsc1 dcl1 mc145572 mc14lc5480 codec 2 codec 3 interface1 dfsc2 dfsc3 codec 4 tx dt dt dt dt rx dr dr dr dr codec 1 mc14lc5480 mc14lc5480 mc14lc5480 bclkt bclkt bclkt bclkt fst fst fst fst idl sync idl clk MCF5272 fsr gnd bclkr vdd fsr gnd bclkr vdd fsr vdd bclkr rs232 transceiver fsr vdd bclkr
physical layer interface controller (plic) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 13-41 figure 13-40. standard idl2 10-bit mode in the above example, codec 1 transmits and receive s in the b3 time slot once the u transceiver has completed the d channel. from the rising edge of fsc1, this is at least 19 dcl clocks later. in figure 13-40 , a short, optional delay, is s hown between the end of the d channel and the start of the b3 channel. for example, let us say this is 1 dcl cl ocks long. this defines the programmable delay 1 value to be 20, (19 + 1), or 0x0014. the dfsc3 signal synchr onizes codecs 3 and 4, and the rising edge of this frame sync occurs 20 clocks after dfsc2, therefore 40 dcl clocks after fsc1. this defines the value for programmable delay 3 to be 40, (19 + 1 + 20), or 0x0028. 13.6.5 example 3: two-line re mote access with ports 0 and 1 in this example, ports 0 and 1 are connected to tw o s/t transceivers. ports 0 and 1 are programmed in slave mode. ports 2 and 3 are not used, and may be disabled. figure 13-41. two-line remote access b1 b2 d u transceiver b3 b4 b5 b6 codec 1 codec 2 codec 3 codec 4 dcl fsc1 dfsc2 dfsc3 din1/ dout1 d mc145574 #1 interface 1 tx rx idl sync idl clk din0 dout0 fsc0 dcl0 interface 0 dgrant drequest dgnt0 dreq0 din1 dout1 fsc1 dcl1 dgnt1 dreq1 tx rx idl sync idl clk dgrant drequest mc145574 #2 MCF5272
physical layer interface controller (plic) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 13-42 freescale semiconductor two of freescale?s mc145574 s/t transceivers are s hown connected to ports 0 and 1. the frame sync control signal fsc0 is connected to s/t transceiver one, while fsc1 is connected to transceiver two. figure 13-42 shows an example of the id l bus timing relationship of th e s/t transceivers when in standard idl2 8-bit mode with a common frame sync. figure 13-42. standard idl2 8-bit mode b1 b2 d mc145574 #1 dcl fsc0 fsc1 din0/ din1/ dout1 dout0 b1 b2 d mc145574 #2
MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 14-1 chapter 14 queued serial peripheral interface (qspi) module this chapter describes the queued serial peripher al interface (qspi) module. following a feature-set overview is a description of opera tion including details of the qspi?s internal ram organization. the chapter concludes with the progra mming model and a timing diagram. 14.1 overview the queued serial peripheral interf ace module provides a serial periphe ral interface with queued transfer capability. it allows users to enqueue up to 16 tran sfers at once, eliminating cpu intervention between transfers. transfer rams in the qspi are indi rectly accessible using address and data registers. functionality is very similar, but not identical, to the qspi portion of the qsm (queued serial module) implemented in the mc68332. 14.2 features ? programmable queue to support up to 16 transfers without user intervention ? supports transfer sizes of 8 to 16 bits in 1-bit increments ? four peripheral chip-select lines for control of up to 15 devices ? baud rates from 129.4 kbps to 16.5 mbps at 66 mhz ? programmable delays before and after transfers ? programmable clock phase and polarity ? supports wraparound mode for continuous transfers 14.3 module description the qspi module communicates with the integrated coldfire cpu using internal memory mapped registers located starting at mbar + 0xa0. see also section 14.5, ?programming model .? a block diagram of the qspi module is shown in figure 14-1 .
queued serial peripheral interface (qspi) module MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 14-2 freescale semiconductor figure 14-1. qspi block diagram queue control block queue pointer clkin 4 done comparator end queue pointer status regs delay counter control logic control regs 80-byte qspi ram chip select command divide by 2 baud rate generator msbit lsbit logic array qspi_clk qspi_cs[3:0] qspi_din 8/16 bit shift reg. rx/tx data reg. qspi_dout 4 4 4 internal bus 4 qspi address register qspi data register
queued serial peripheral interface (qspi) module MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 14-3 14.3.1 interface and pins the module provides as many as 15 por ts and a total of seven signals : qspi_dout, qspi_din, qspi_clk, qspi_cs0, qspi_cs1, q spi_cs2, and qspi_cs3. peripheral chip-select signals, qspi_c s[0:3], are used to select an ex ternal device as the source or destination for serial data transfer . signals are asserted at a logic le vel corresponding to the value of the qspi_cs[3:0] bits in the command ram whenever a command in the queue is executed. more than one chip-select signal can be asserted simultaneously. although qspi_cs[0:3] will f unction as simple chip selects in most applications, up to 15 ports can be selected by decoding th em with an external 4-to-16 decoder. note that chip selects qspi_cs[ 3:1] are multiplexed with other pin functions. qspi_dout, qspi_clk, and qspi_cs0 are multiplexed w ith MCF5272 configuration inputs that only function during system reset. 14.3.2 internal bus interface because the qspi module only operates in master m ode, the master bit in the qspi mode register (qmr[mstr]) must be set for the q spi to function properly. the qspi can initiate serial transfers but cannot respond to transfers init iated by other qspi masters. 14.4 operation the qspi uses a dedicated 80-byte block of static ram accessible bot h to the module and the cpu to perform queued operations. the ram is divi ded into three segments as follows: ? 16 command control bytes (command ram) ? 16 transmit data words, (transfer ram) ? 16 receive data words (transfer ram) ram is organized so that 1 byte of command control data, 1 word of tran smit data, and 1 word of receive data comprise 1 queue entry, 0x0?0xf. the user initiates qspi operation by loading a queue of commands in command ram, writing transmit data into transmit ram, and then enabling the q spi data transfer. the qspi executes the queued commands and sets the completion flag in the qspi interrupt register (qir [spif]) to signal their completion. optionally, qir[spife] can be enabled to generate an interrupt. table 14-1. qspi input and output signals and functions signal name hi-z or actively driven function qspi data output (qspi_dout) configur able serial data output from qspi qspi data input (qspi_din) n/a serial data input to qspi serial clock (qspi_clk) actively driven clock output from qspi peripheral chip selects (qspi_cs[3:0]) actively driven peripheral selects
queued serial peripheral interface (qspi) module MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 14-4 freescale semiconductor the qspi uses four queue pointers. th e user can access three of them thr ough fields in qspi wrap register (qwr): ? the new queue pointer, qwr[newqp], poi nts to the first command in the queue. ? an internal queue pointer points to the command currently being executed. ? the completed queue pointer, qwr[cptqp], points to the last command executed. ? the end queue pointer, qw r[endqp], points to the final command in the queue. the internal pointer is initialized to the same value as qwr[newqp]. during normal operation, the following sequence repeats: 1. the command pointed to by the internal pointer is executed. 2. the value in the internal point er is copied into qwr[cptqp]. 3. the internal pointer is incremented. execution continues at the internal pointer address unless the qwr[newqp] value is changed. after each command is executed, qwr[endqp] and qwr[cptqp] are compar ed. when a match occurs, qir[spif] is set and the qspi stops unless wrap around mode is enabled. setting qwr[wren] enables wraparound mode. qwr[newqp] is cleared at reset. when the qspi is enabled, execution begins at address 0x0 unless another value has been written into qwr[newqp]. qwr[endqp] is clea red at reset but is changed to show the last queue entry before the qspi is enabled. qwr[newqp] and qwr[endqp] can be written at any time. when the qwr[newqp] value changes, the internal pointer value also changes unless a transfer is in progress, in which case the tran sfer completes normally. leaving qwr[newqp] and qwr[endqp] set to 0x0 causes a single transf er to occur when the qspi is enabled. data is transferred relative to qspi _clk which can be generated in any one of four combin ations of phase and polarity using qmr[cpha, cpol]. data is transferred most signifi cant bit (msb) fi rst. the number of bits transferred defaults to eight, but can be se t to any value from 8 to 16 by writing a value into the bitse field of the command ram, qcr[bitse] . 14.4.1 qspi ram the qspi contains an 80-byte block of static ram that can be acce ssed by both the user and the qspi. this ram does not appear in the MCF5272 memory map because it can only be accessed by the user indirectly through the qspi addre ss register (qar) and the qspi da ta register (qdr). the ram is divided into three segments with 16 addresses each: ? receive data ram, the initial destination for all incoming data ? transmit data ram, a buffer for all out-bound data ? command ram, where commands are loaded the transmit and command ram are write-only by the user. the receive ram is read-only by the user. figure 14-2 shows the ram configuration. the ram contents ar e undefined immediat ely after a reset. the command and data ram in the qspi is indire ctly accessible with qdr and qar as 48 separate locations that comprise 16 words of transmit data, 16 words of receive data and 16 bytes of commands.
queued serial peripheral interface (qspi) module MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 14-5 a write to qdr causes data to be written to th e ram entry specified by qar[addr] and causes the value in qar to increment. correspondingly, a read at qdr returns the data in the ram at the address specified by qar[addr]. this also causes qar to increment. a read access requires a si ngle wait state. 14.4.1.1 receive ram data received by the qspi is stored in the receive ram segment locate d at 0x10 to 0x1f in the qspi ram space. the user reads this segment to retrieve data fr om the qspi. data words with less than 16 bits are stored in the least significant bits of the ram. unus ed bits in a receive queue entry are set to zero upon completion of the indi vidual queue entry. note throughout coldfire documentation, ?w ord? is used consistently and exclusively to designate a 16-bit da ta unit. the only exceptions to this appear in discussions of serial comm unication modules such as qspi that support variable-length data units. to simplify these discussions the functional unit is referred to as a ?word? regardless of length. qwr[cptqp] shows which queue entrie s have been executed. the user can query this field to determine which locations in receiv e ram contain valid data. relative address register function 0x00 qtr0 transmit ram 0x01 qtr1 . . 16 bits wide .. .. 0x0f qtr15 0x10 qrr0 receive ram 0x11 qrr1 . . 16 bits wide .. .. 0x1f qrr15 0x20 qcr0 command ram 0x21 qcr1 . . 8 bits wide .. .. 0x2f qcr15 figure 14-2. qspi ram model
queued serial peripheral interface (qspi) module MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 14-6 freescale semiconductor 14.4.1.2 transmit ram data to be transmitted by the qspi is stored in the transmit ram segm ent located at addresses 0x0 to 0xf. the user normally writes 1 word in to this segment for each queue co mmand to be executed. the user cannot read transmit ram. out-bound data must be written to transmit ram in a right-justified format. the unused bits are ignored. the qspi copies the data to its data serializer (shift register) for transmission. th e data is transmitted most significant bit first and remains in tran smit ram until overw ritten by the user. 14.4.1.3 command ram the cpu writes one byte of control information to this segment for ea ch qspi command to be executed. command ram is write-only memo ry from a user?s perspective. command ram consists of 16 bytes wi th each byte divided into two fiel ds. the peripheral chip select field controls the qspi_cs signal levels for the tr ansfer. the command contro l field provides transfer options. a maximum of 16 commands can be in the queue. queue execution proceeds from the address in qwr[newqp] through the address in qwr[endqp]. the qspi executes a queue of comm ands defined by the control bits in each command ram entry which sequence the following actions: ? chip-select pins are activated ? data is transmitted from transmit ram and receiv ed into the receive ram ? the synchronous transfer cl ock qspi_clk is generated before any data transfers begin, control data must be written to the comm and ram, and any out-bound data must be written to tr ansmit ram. also, the queue pointers must be initialized to the first and last entries in the command queue. data transfer is synchronized with the internally generated qspi_clk, whos e phase and polarity are controlled by qmr[cpha] and qmr[cpol]. these c ontrol bits determine wh ich qspi_clk edge is used to drive outgoing data and to latch incoming data. 14.4.2 baud rate selection the maximum qspi clock frequency is one-fourth the clock frequenc y applied at the clkin pin. baud rate is selected by writing a valu e from 2?255 into qmr[ba ud]. the qspi uses a pr escaler to derive the qspi_clk rate from the system clock, clkin, divided by two. a baud rate value of zero turns off the qspi_clk. th e desired qspi_clk baud ra te is related to clkin and qmr[baud] by the following expression: qmr[baud] = clkin / [2 (desired qspi_clk baud rate)]
queued serial peripheral interface (qspi) module MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 14-7 14.4.3 transfer delays the qspi supports programmable delays for the qspi_c s signals before and after a transfer. the time between qspi_cs assertion and the l eading qspi_clk edge, and the time between the end of one transfer and the beginning of the next, ar e both independently programmable. the chip select to clock dela y enable (dsck) bit in comma nd ram, qcr[dsck], enables the programmable delay period from qspi _cs assertion until the leading edge of qspi_clk. qdlyr[qcd] determines the period of delay before the leadi ng edge of qspi_clk. th e following expression determines the actual delay befo re the qspi_clk leading edge: qspi_cs-to-qspi_clk delay = qcd/clkin frequency qcd has a range of 1?127. when qcd or dsck equals zero, the standard de lay of one-half the qspi_clk period is used. the delay after transmit enable (dt) bit in command ram enables the programmable delay period from the negation of the qspi_cs signals until the start of the next transfer. th e delay after transfer can be used to provide a peripheral deselect in terval. a delay can also be inserted between consecutive transfers to allow serial a/d converters to complete conversion. there are two transfer de lay options: the user can choose to delay a standard period af ter serial transfer is complete or can specify a delay period. writing a value to qdlyr[dtl] specifies a delay period. the dt bit in comm and ram determines whether the standard delay period (dt = 0) or the specified dela y period (dt = 1) is used. the following expression is used to calculate the delay: delay after transfer = 32 qdlyr[dtl] /clkin frequency (dt = 1) where qdlyr[dtl] has a range of 1?255. a zero value for dtl causes a delay-afte r-transfer value of 8192/clkin frequency. standard delay after transfer = 17/clkin frequency (dt = 0) receiving devices need at least the standard dela y (dt=0) between successive transfers for long data streams because the qspi module requi res time to load a transmit ram entry for transfer. if clkin is operating at a slower rate, the delay between transfers must be increased proportionately. table 14-2. qspi_clk frequency as function of cpu clock and baud rate qmr [baud] cpu clock 66 mhz 48 mhz 33 mhz 20 mhz 2 16,500,000 12,000,00 0 8,250,000 5,000,000 4 8,250,000 6,000,000 4,125,000 2,500,000 8 4,125,000 3,000,000 2,062,500 1,250,000 16 2,062,500 1,500,00 0 1,031,250 625,000 32 1,031,250 750,000 515,625 312,500 255 129,412 94,118 64,706 39,216
queued serial peripheral interface (qspi) module MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 14-8 freescale semiconductor 14.4.4 transfer length there are two transfer lengt h options. the user can choos e a default value of 8 bits or a programmed value of 8 to 16 bits inclusive. the prog rammed value must be written into qmr[bits]. the bits per transfer enable (bitse) field in the comm and ram determines whether the default value (bitse = 0) or the bits[3?0] value (bitse = 1) is us ed. qmr[bits] gives the required numb er of bits to be transferred, with 0b0000 representing 16. 14.4.5 data transfer operation is initiated by setting qdl yr[spe]. shortly after qdlyr[spe] is set, the qspi executes the command at the command ram address pointed to by qwr[newqp]. data at the pointer address in transmit ram is loaded into the data serializer and transmitted. data that is simultaneously received is stored at the pointer address in receive ram. when the proper number of bits has been transferred, the qspi stores the working queue pointer value in qwr[cptqp], increments the worki ng queue pointer, and loads the next data for transfer from the transmit ram. the command pointed to by the incr emented working queue pointer is executed next unless a new value has been written to qwr[newqp]. if a new queue pointer value is written while a transfer is in progress, then th at transfer is completed normally. when the cont bit in the command ram is set, th e qspi_cs signals are asse rted between transfers. when cont is cleared, qspi_cs[0: 3] are negated between transfers. the qspi_cs signa ls are not high impedance. when the qspi reaches the end of th e queue, it asserts the sp if flag, qir[spif]. if qi r[spife] is set, an interrupt request is generated when qir[spif] is asserte d. then the qspi clears qdlyr[spe] and stops, unless wraparound mode is enabled. wraparound mode is enabled by setting qwr[wren]. th e queue can wrap to pointer address 0x0, or to the address specified by qwr[newqp], depending on the state of qwr[wrto]. in wraparound mode, the qspi cycles through the que ue continuously, even while requesting interrupt service. qdlyr[spe] is not cleared when the last co mmand in the queue is executed. new receive data overwrites previously received data in the receive ram. each time the end of the queue is reached, qir[spife] is set. qir[spif] is not automatically rese t. if interrupt driven qspi service is used, the service routine must clear qir[spif] to abort the current reques t. additional interr upt requests during servicing can be prevente d by clearing qir[spife]. there are two recommended met hods of exiting wraparound mode: clearing qwr[wren] or setting qwr[halt]. exiting wraparound mode by clearing qdlyr[spe] is not recommended because this may abort a serial transfer in progress. the qspi sets spif, clears qdlyr[spe], a nd stops the first time it reaches the end of the queue after qwr[wren] is cleared. after qwr[ha lt] is set, the qspi finishes the current transfer, then stops executing commands. after the qspi stops, qdlyr[spe] can be cleared.
queued serial peripheral interface (qspi) module MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 14-9 14.5 programming model the programming model for the qspi consists of six re gisters. they are the qspi mode register (qmr), qspi delay register (qdlyr), qspi wrap register (q wr), qspi interrupt regist er (qir), qspi address register (qar), and the q spi data register (qdr). there are a total of 80 bytes of memory used for transmit, receive, and control data. this memory is accessed indirectly using qar and qdr. registers and ram are written and read by the cpu. 14.5.1 qspi mode register (qmr) the qmr register, shown in figure 14-3 , determines the basic operating modes of the qspi module. parameters such as clock polarity and phase, baud ra te, master mode operati on, and transfer size are determined by this register. the data output high impedance enable, dohie, controls the operation of qspi_dout between data transfers. when dohie is cleared, qspi_dout is actively driven between transfers. when dohie is set, qspi _dout assumes a high impedance state. note because the qspi doe s not operate in slave mode , the master mode enable bit, qmr[mstr], must be set for th e qspi module to operate correctly. table 14-3 gives qmr field descriptions. 15 14 13 10 9 8 7 0 field mstr dohie bits cpol cpha baud reset 0000_0001_0000_0100 r/w r/w address mbar + 0x00a0 figure 14-3. qspi mode register (qmr) table 14-3. qmr field descriptions bits name description 15 mstr master mode enable. 0 reserved, do not use. 1 the qspi is in master mode. must be set for the qspi module to operate correctly. 14 dohie data output high impedance enable. selects qspi_dout mode of operation. 0 default value after reset. qspi_dout is actively driven between transfers. 1 qspi_dout is high impedance between transfers.
queued serial peripheral interface (qspi) module MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 14-10 freescale semiconductor figure 14-4 shows an example of a qspi clocking and data transfer. figure 14-4. qspi clocking and data transfer example 13?10 bits transfer size. determines the number of bi ts to be transferred for each entry in the queue. value bits per transfer 0000 16 0001? 0111 reserved 1000 8 1001 9 1010 10 1011 11 1100 12 1101 13 1110 14 1111 15 9 cpol clock polarity. defines the clock polarity of sck. 0 the inactive state value of qspi_clk is logic level 0. 1 the inactive state value of qspi_clk is logic level 1. 8 cpha clock phase. defines the qspi_clk clock-phase. 0 data captured on the leading edge of qspi_clk and changed on the following edge of qspi_clk. 1 data changed on the leading edge of qspi_clk and captured on the following edge of qspi_clk. 7?0 baud baud rate divider. the baud rate is selected by writing 0, or a value in the range 2?255. 1 is not a valid value. a value of zero disables the qspi. the desi red qspi_clk baud rate is related to clkin and qmr[baud] by the following expression: qmr[baud] = systemclock / [2 (desired qspi_clk baud rate)] table 14-3. qmr field descriptions (continued) bits name description qspi_clk qspi_dout qspi_din qspi_cs a b qmr[cpol] = 0 qmr[cpha] = 1 qcr[cont] = 0 chip selects are active low a = qdlyr[qcd] b = qdlyr[dtl] 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 msb
queued serial peripheral interface (qspi) module MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 14-11 figure 14-5 shows the timing of the four spi modes. figure 14-5. spi modes timing 14.5.2 qspi delay register (qdlyr) figure 14-6 shows the qspi delay register. table 14-4 gives qdlyr field descriptions. table 14-4. qdlyr field descriptions 15 14 8 7 0 field spe qcd dtl reset 0000_0100_0000_0100 r/w r/w address mbar + 0x00a4 figure 14-6. qspi delay register (qdlyr) bits name description 15 spe qspi enable. when set, the qspi initiates tran sfers in master mode by executing commands in the command ram. automatically cleared by the qspi when a transfer completes.the user can also clear this bit to abort transfer unless qir[abrtl] is set. th e recommended method for aborting transfers is to set qwr[halt]. 14?8 qcd qspilck delay. when the dsck bit in the command ram, is set this field determines the length of the delay from assertion of the chip selects to valid qspi_clk transition. 7?0 dtl delay after transfer.when the dt bit in the command ram sets this field determines the length of delay after the serial transfer. sck sck sck sck (cpol = 0, cpha = 0) (cpol = 0, cpha = 1) (cpol = 1, cpha = 0) (cpol = 1, cpha = 1)
queued serial peripheral interface (qspi) module MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 14-12 freescale semiconductor 14.5.3 qspi wrap register (qwr) table 14-5 gives qwr field descriptions. 15 14 13 12 11 8 7 4 3 0 field halt wren wrto csiv endqp ? newqp reset 0000_0000_0000_0000 r/w r/w address mbar + 0x00a8 figure 14-7. qspi wrap register (qwr) table 14-5. qwr field descriptions bits name description 15 halt halt transfers. assertion of this bit causes the qspi to stop execution of commands once it has completed execution of the current command. 14 wren wraparound enable. enables wraparound mode. 0 execution stops after executing the command pointed to by qwr[endqp]. 1 after executing command pointed to by qwr[endqp], wrap back to entry zero, or the entry pointed to by qwr[newqp] and continue execution. 13 wrto wraparound location. determines where the qspi wraps to in wraparound mode. 0 wrap to ram entry zero. 1 wrap to ram entry pointed to by qwr[newqp]. 12 csiv qspi_cs inactive level. 0 qspi chip select outputs return to zero when not driven from the value in the current command ram entry during a transfer (that is, inactive state is 0, chip selects are active high). 1 qspi chip select outputs return to one when not driven from the value in the current command ram entry during a transfer (that is, inactive state is 1, chip selects are active low). 11?8 endqp end of queue pointer. points to the ram entry that contains the last transfer description in the queue. 7?4 cptqp completed queue entry pointer. points to the ra m entry that contains the last command to have been completed. this field is read only. 3?0 newqp start of queue pointer. this 4-bit field points to the first entry in the ram to be executed on initiating a transfer.
queued serial peripheral interface (qspi) module MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 14-13 14.5.4 qspi interrupt register (qir) figure 14-8 shows the qspi interrupt register. table 14-6 describes qir fields. the command and data ram in the qspi is indire ctly accessible with qdr and qar as 48 separate locations that comprise 16 words of transmit data, 16 words of receive data and 16 bytes of commands. a write to qdr causes data to be written to the ram entry specified by qar[addr]. this also causes the value in qar to increment. 15 14 13 12 11 10 9 8 7 4 3 2 1 0 field wcefb abrtb ? abrtl wcefe abrte ? spife ? wcef abrt ? spif reset 0000_0000_0000_0000 r/w r/w address mbar + 0x00ac figure 14-8. qspi interrupt register (qir) table 14-6. qir field descriptions bits name description 15 wcefb write collision access error enable. a write collision occurs during a data transfer when the ram entry containing the command currently being executed is wr itten to by the cpu with the qdr. when this bit is asserted, the write access to qdr results in an access error. 14 abrtb abort access error enable. an abort occurs when qdlyr[spe] is cleared duri ng a transfer. when set, an attempt to clear qdly r[spe] during a transfer results in an access error. 13 ? reserved, should be cleared. 12 abrtl abort lock-out. when set, qdlyr[spe] cannot be cleared by writing to the qdlyr. qdlyr[spe] is only cleared by the qspi when a transfer completes. 11 wcefe write collision interrupt enable. interrupt enable for wcef. setting this bit enables the interrupt, and clearing it disables the interrupt. 10 abrte abort interrupt enable. interrupt enable for abrt flag. setting this bit enables the interrupt, and clearing it disables the interrupt. 9 ? reserved, should be cleared. 8 spife qspi finished interrupt enable. interrupt enable for spif. setting this bit enables the interrupt, and clearing it disables the interrupt. 7?4 ? reserved, should be cleared. 3 wcef write collision error flag. indicates that an atte mpt has been made to write to the ram entry that is currently being executed. writing a 1 to this bit clears it and writing 0 has no effect. 2 abrt abort flag. indicates that qdlyr[spe] has been clear ed by the user writing to the qdlyr rather than by completion of the command queue by the qspi. writin g a 1 to this bit clears it and writing 0 has no effect. 1 ? reserved, should be cleared. 0 spif qspi finished flag. asserted when the qspi has completed all the commands in the queue. set on completion of the command pointed to by qwr[e ndqp], and on completion of the current command after assertion of qwr[halt]. in wraparound mode, this bit is set every time the command pointed to by qwr[endqp] is completed. writing a 1 to th is bit clears it and writing 0 has no effect.
queued serial peripheral interface (qspi) module MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 14-14 freescale semiconductor correspondingly, a read at qdr returns the data in the ram at the address specified by qar[addr]. this also causes qar to increment. a read access requires a single wait state. note the qar does not wrap after the last que ue entry within each section of the ram. 14.5.5 qspi address register (qar) the qar, shown in figure 14-9 , is used to specify the location in the qspi ram that read and write operations affect. 14.5.6 qspi data register (qdr) the qdr, shown in figure 14-10 , is used to access qspi ram indire ctly. the cpu reads and writes all data from and to the qspi ram thr ough this register. a read or write to qdr causes the value in qar to increment. 15 65 0 field ? addr reset 0000_0000_0000_0000 r/w r/w address mbar + 0x00b0 figure 14-9. qspi address register 15 0 field data reset 0000_0000_0000_0000 r/w r/w address mbar + 0x00b4 figure 14-10. qspi data register
queued serial peripheral interface (qspi) module MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 14-15 14.5.7 command ram re gisters (qcr0?qcr15) the command ram is accessed using the upper byte of qdr. the qspi cannot modify information in command ram. there are 16 bytes in the command ram. each byte is di vided into two fields. the chip select field enables external peripherals for transfer. the co mmand field provides transfer operations. note the command ram is accessed only us ing the most significant byte of qdr and indirect addre ssing based on qar[addr]. figure 14-11 shows the command ram register. 15 14 13 12 11 8 7 0 field cont bitse dt dsck qspi_cs ? reset undefined r/w write only address qar[addr] figure 14-11. command ram registers (qcr0?qcr15) table 14-7 gives qcr field descriptions. table 14-7. qcr0?qcr15 field descriptions bits name description 15 cont continuous. 0 chip selects return to inactive level defined by qwr[csiv] when transfer is complete. 1 chip selects remain asserted between transfers for a transfer of up to 16 words of data. 1 1 in order to keep the chip setects asserted for all transfers, th e qwr[csiv] bit must be set to control the level that the chip selects return to after the first transfer. 14 bitse bits per transfer enable. 0 eight bits 1 number of bits set in qmr[bits] 13 dt delay after transfer enable. 0 default reset value. 1 the qspi provides a variable delay at the end of serial transfer to facilitate interfacing with peripherals that have a latency requirement. the delay between transfers is determined by qdlyr[dtl]. 12 dsck chip select to qspi_clk delay enable. 0 chip select valid to qspi_clk transition is one-half qspi_clk period. 1 qdlyr[qcd] specifies the delay from qspi_cs valid to qspi_clk. 11?8 qspi_cs peripheral chip selects. used to select an external device for serial data transfer. more than one chip select may be active at once, and more than one device can be connected to each chip select. bits 11?8 map directly to qspi_cs[3:0], respectively. if it is desired to use those bits as a chip select value, then an external demultiplexor must be connected to the qspi_cs[3:0] pins. 7?0 ? reserved, should be cleared.
queued serial peripheral interface (qspi) module MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 14-16 freescale semiconductor 14.5.8 programming example the following steps are necessary to set up the qspi 12-bit data tran sfers and a qspi_clk of 4.125 mhz. the qspi ram is set up for a queue of 16 transfers. all four qspi_cs signals ar e used in this example. 1. enable all qspi_cs pins on the MCF5272. write pacnt with 0x0080_4000 to enable qspi_cs1 and qspi_cs3.write pdcnt with 0x0000_0030 to enable qspi_cs2. 2. write the qmr with 0xb308 to set up 12-bit data words with the data shifted on the falling clock edge, and a clock frequency of 4.125 mhz (assuming a 66-mhz clkin). 3. write qdlyr with the desired delays. 4. write qir with 0xd00d to enab le write collision, abort bus er rors, and clear any interrupts. 5. write qar with 0x0020 to select the first command ram entry. 6. write qdr with 0x7e00, 0x7e00, 0x7e 00, 0x7e00, 0x7d00, 0x7d00, 0x7d00, 0x7d00, 0x7b00, 0x7b00, 0x7b00, 0x7b00, 0x7700, 0x7700, 0x7700, and 0x7700 to set up four transfers for each chip select. the chip selects are active low in this example. 7. write qar with 0x0000 to select the first transmit ram entry. 8. write qdr with sixteen 12-bit words of data. 9. write qwr with 0x0f00 to set up a queue be ginning at entry 0 and ending at entry 15. 10. set qdlyr[spe] to enable the transfers. 11. wait until the transfers are complete. qir[spi f] is set when the transfers are complete. 12. write qar with 0x0010 to select the first receive ram entry. 13. read qdr to get the received data for each transfer. 14. repeat steps 5 through 13 to do another transfer.
MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 15-1 chapter 15 timer module this chapter describes configuration and operation of the four general-purpose timer modules, timer 0, 1, 2 and 3. 15.1 overview the timer module has four identical general-purpos e 16-bit timers and a software watchdog timer, described in chapter 6, ?system integration module (sim) .? each general-purpose timer consists of a timer mode register (tmr n ), a timer capture register (tcap n ), a 16-bit timer counter (tcn n ), a timer reference register (trr n ), and a timer event register (ter n ). the tmrs contain the prescaler value programmed by the user. the four timer units have the following features: ? maximum period of 4 seconds at 66 mhz ? 15-ns resolution at 66 mhz ? programmable sources for the cloc k input, including external clock ? input capture capability with progr ammable trigger edge on input pins ? output compare with programmable mode for the output pins ? free run and restart modes 15.2 timer operation the timer units consist of four id entical, independent 16-bit timers, ti mers 0?3. for timers 0 and 1, the clock input to the prescaler is sel ected from the main clock (divided by 1 or 16) or from the corresponding timer input (tin0 or tin1) pin. for timers 2 and 3, th e clock input to the prescaler can be selected only from the main clock (divided by 1 or 16). tin is in ternally synchronized to the internal clock, with a synchronization delay between two and three main clocks. the clock input source is selected by the clk bits of the corresponding t imer mode register (tmr0?tmr3). the pr escaler is programmed to divide the clock input by values from 1 to 256. th e output of the prescaler is used as an input to the 16-bit counter. the maximum timer resolution is one system clock cycle (15 ns at 66 mhz). the maximum period (the reference value is all one s) is 268,435,456 cycles = 2 4 2 8 2 16 (4 seconds at 66 mhz). the timer can be configured to count until a reference is reached at which point it can either start a new time count immediately or continue to run. the free run/restart bit, tmr n [frr], selects each mode. upon reaching the reference value, the ter0 or ter1 bit is set, and an interrupt is issu ed if the output reference interrupt enable bit, tmr[ori], is set.
timer module MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 15-2 freescale semiconductor figure 15-1. time r block diagram timers 0 and 1 may output a signal on the timer outputs (tout0 or tout 1) when the reference value is reached, as selected by the output mode bit, tmr[om]. this signal can be an active-lo w pulse or a toggle of the current output, under program control. the tcaps are used to latch counte r values when the corresponding input capture edge detector detects a defined transition (of tin0 , tin1, urt0_rxd, or urt1_rxd). th e type of transition triggering the capture is selected by the capture edge bits, tmr[ce ].a capture or reference ev ent sets the ter bit and generates a maskable interrupt. data [16) timer clock generator divider timer mode register (tmr0) prescaler mode bits timer counter (tcn0) 15 0 timer reference register (trr0) 15 0 timer capture register (tcap0) 15 0 15 0 capture detection system clock or system clock/16 tin0 tout0 clock timer 0 timer 1 interrupt (t1) interrupt (t0) tout1 tin1 timer clock generator divider timer mode register (tmr 2) prescaler mode bits timer counter (tcn2) 15 0 timer reference register (trr2) 15 0 timer capture register (tcap2) 15 0 15 0 capture detection system clock or system clock/16 uart0_rxd clock timer 2 timer 3 interrupt (t3) interrupt (t2) uart1_rxd timer event register (ter0) 15 0 timer event register (ter2) 15 0
timer module MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 15-3 15.3 general-purpose timer registers the following sections desc ribe the timer registers. 15.3.1 timer mode registers (tmr0?tmr3) the tmrs, table 15-2 , have fields for choosing a prescaler , a clock edge, and other parameters. tmr n fields are described in table 15-1 . 15 876543210 field prescaler (ps) ce om 1 ori frr clk rst reset 0000_0000_0000_0000 r/w read/write addr mbar + 0x200 (tmr0); 0x220 (t mr1); 0x240 (tmr2); 0x260 (tmr3) 1 not implemented (reserved) in tmr2 and tmr3. figure 15-2. timer mode registers (tmr0?tmr3) table 15-1. tmr n field descriptions bits name description 15?8 ps prescaler. programmed to divide the clock input by values from 1 to 256. the value 0000_0000 divides the clock by 1; the value 1111_1111 divides the clock by 256. 7?6 ce capture edge and enable interrupt. 00 disable capture and inte rrupt on capture event 01 capture on rising edge only and generate interrupt on capture event 10 capture on falling edge only and generate interrupt on capture event 11 capture on any edge and generate interrupt on capture event 5 om output mode (tmr0 and tmr1 only. reserved in tmr2 and tmr3) 0 active-low pulse for one system clock cycle (15 ns at 66 mhz) 1 toggle output tout n is high at reset but is unavailable externally until the appropriate port control register is configured for this function. see section 17.2, ?port control registers .? 4 ori output reference interrupt enable 0 disable interrupt for reference reached (does not affect interrupt on capture function) 1 enable interrupt upon reaching the reference value if ori is 1 when the ter[ref] is set, an immediate interrupt occurs. 3 frr free run/restart 0 free run. timer count continues to incr ement after the refere nce value is reached. 1 restart. timer count is reset immediately after the reference value is reached. 2?1 clk input clock source for the timer 00 stop count 01 master system clock 10 master system clock divided by 16. tin0 and tin1 are external to the MCF5272 and are not synchronized to the system clock, so successive timeout lengths may vary slightly. 11 corresponding tin pin, tin0 or tin1 (falling edge), unused in tmr2 and tmr3 the minimum high and low peri ods for tin as the clock source is 1 system clock, which gives a maximum tin frequency of clock/2.
timer module MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 15-4 freescale semiconductor 15.3.2 timer reference registers (trr0?trr3) each trr holds a 16-bit reference value that is comp ared with the free-running tc n as part of the output compare function. a match occurs wh en tcn increments to equal trr. 15.3.3 timer capture registers (tcap0?tcap3) each tcap is used to latch the tcn value duri ng a capture operation when an edge occurs on the respective tin0, tin1, uart0_rxd, or uart1_rxd, as programmed in tmr n . 15.3.4 timer counte rs (tcn0?tcn3) tcn registers are 16-bit up counters. reading a tcn n gives the current counter value without affecting counting. a write cycle to a tcn register causes it to be cleared. 0 rst reset timer. 0 a transition from 1 to 0 resets the timer. other regi ster values can be written. the counter/timer/prescaler are not clocked unless the timer is enabled. 1 enable timer 15 0 field ref (16-bit reference value) reset 1111_1111_1111_1111 r/w read/write addr mbar + 0x204 (trr0); 0x224 (trr1); 0x244 (trr2); 0x264 (trr3) figure 15-3. timer reference registers (trr0?trr3) 15 0 field cap (16-bit capture counter value) reset 0000_0000_0000_0000 r/w read only addr mbar + 0x208 (tcap0); 0x228 (tc ap1); 0x248 (tcap2); 0x268 (tcap3) figure 15-4. timer capture registers (tcap0?tcap3) 15 0 field count (16-bit timer counter value) reset 0000_0000_0000_0000 r/w read/write addr mbar + 0x20c (tcn0); 0x22c (t cn1); 0x24c (tcn2); 0x26c (tcn3) figure 15-5. timer counter (tcn0?tcn3) table 15-1. tmr n field descriptions (continued) bits name description
timer module MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 15-5 15.3.5 timer event registers (ter0?ter3) ters are used to report events recognized by the timer. on recognition of an event, the timer sets the appropriate ter n bit, regardless of the corresponding interr upt enable bits (ori and ce) in the tmr n . writing a 1 to a bit clears it; writing 0 has no effect. bo th bits must be cleared before the timer can negate the request to the interrupt controller. bo th bits may be cleared simultaneously. table 15-2 describes ter n fields. 15 210 field ? ref cap reset 0000_0000_0000_0000 r/w read/write addr mbar + 0x210 (ter0); 0x230 (t er1); 0x250 (ter2); 0x270 (ter3) figure 15-6. timer event registers (ter0?ter3) table 15-2. ter n field descriptions bits name description 15?2 ? reserved, should be cleared. 1 ref output reference event. 0 the counter has not reached the trr value 1 the counter reached the trr value. tmr[ori] is used to enable the interrupt request caused by this event. write a 1 to this bit to clear the event condition. 0 cap capture event. 0 the counter value has not been latched into the tcap. 1 the counter value is latched in the tcap. tmr[ce] is used to enable capture and the interrupt request caused by this event. write a 1 to this bit to clear the event condition.
timer module MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 15-6 freescale semiconductor
MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 16-1 chapter 16 uart modules this chapter describes the use of the universal asynchronous/synchronous receiver/transmitters (uarts) implemented on the MCF5272 and incl udes programming examples. all refe rences to uart refer to one of these modules. 16.1 overview the MCF5272 contains two independent uarts. each uart can be clocked by either urt_clk or clkin, eliminating the need fo r an external crystal. as figure 16-1 shows, each uart module interfaces directly to the cpu and c onsists of the following: ? serial communication channel ? programmable transmitter a nd receiver clock generation ? internal channel control logic ? interrupt control logic figure 16-1. simplified block diagram the serial communication channel provides a full-duplex asynchronous/synchronous receiver and transmitter deriving an operating frequency from clki n or an external clock of the correct frequency (urt_clk). the transmitter converts parallel data from the cpu to a serial bit stream, inserting appropriate start, stop, and pa rity bits. it outputs the resulting stream on the channel transm itter serial data output (txd). see section 16.5.2.1, ?transmitting .? the receiver converts serial data from the channel receiver serial data input (rxd) to parallel format, checks for a start, stop, and parity bits, or break conditions, and transf ers the assembled character onto the bus during read operations. the receiver ma y be polled- or interrupt-driven. see section 16.5.2.2, ?receiver .? serial interrupt control logic or internal channel control logic programmable clock communications channel generation system integration module (sim) interrupt controller uart clkin urt_cts urt_rts urt_rxd urt_txd external clock (urt_clk)
uart modules MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 16-2 freescale semiconductor 16.2 serial module overview the MCF5272 contains two independent uart modules, whose features are as follows: ? each clocked by either urt_clk or clkin, e liminating a need for an external crystal ? full-duplex asynchronous/synchronous receiver/transmitter channel ? 24-byte fifo receiver ?cts receiver fifo control ? receiver fifo timeout ? 24-byte fifo transmitter ? independently programmable receiver and transmitter clock sources ? programmable data format: ? 5?8 data bits plus parity ? odd, even, no parity, or force parity ? one, one-and-a-half, or two stop bits ? each channel programmable to normal (full-duplex ), automatic echo, local loop-back, or remote loop-back mode ? automatic wake-up mode for multidrop applications ? eight maskable interrupt conditions ? parity, framing, and overrun error detection ? false-start bit detection ? line-break detection and generation ? detection of breaks originating in the middle of a character ? start/end break interrupt/status ? autobaud capability the MCF5272 uart modules are identical to those on other coldfire devices, such as the mcf5206e, with the following exceptions: ? the MCF5272 receiver and transmitter fifos have b een expanded to 24 bytes. ? interrupts can be programmed to occur at various levels of fifo fullness on both the receiver and transmitter. ? autobaud capability has been adde d to automatically calculate the character transmission rate from the first received character. ? registers have been added to increase accuracy in clock generation. 16.3 register descriptions this section contains a detailed de scription of each regist er and its specific f unction. flowcharts in section 16.5.6, ?programming ,? describe basic uart module pr ogramming. the opera tion of the uart module is controlled by writing control bytes into the appropriate registers. table 16-1 is a memory map for uart module registers.
uart modules MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 16-3 table 16-1. uart module programming model mbar offset [31:24] [23:16] [15:8] [7:0] uart0 uart1 0x100 0x140 uart mode registers 1 ?(umr1 n ) [p. 16-4], (umr2 n ) [p. 16-6] ? 0x104 0x144 (read) uart status registers?(usr n ) [p. 16-7] ? (write) uart clock-select register 1 ?(ucsr n ) [p. 16-8] ? 0x108 0x148 (read) do not access. 2 ? (write) uart command registers?(ucr n ) [p. 16-9] ? 0x10c 0x14c (uart/read) uart receiver buffers?(urb n ) [p. 16-10] ? (uart/write) uart transmitter buffers?(utb n ) [p. 16-11] ? 0x110 0x150 (read) uart input port change registers?(uipcr n ) [p. 16-11] ? (write) uart auxiliary control registers 1 ?(uacr n ) [p. 16-12] ? 0x114 0x154 (read) uart interrupt status registers?(uisr n ) [p. 16-12] ? (write) uart interrupt mask registers?(uimr n ) [p. 16-12] ? 0x118 0x158 (read) do not access. 2 ? uart divider upper registers?(udu n ) [p. 16-14] ? 0x11c 0x15c (read) do not access. 2 ? uart divider lower registers?(udl n ) [p. 16-14] ? 0x120 0x160 (read) uart autobaud register msb?(uabu n ) [p. 16-17] ? (write) do not access. 2 ? 0x124 0x164 (read) uart autobaud register lsb?(uabl n ) [p. 16-17] ? (write) do not access 2 ? 0x128 0x168 uart transmitter fifo registers?(utf n ) [p. 16-4] ?
uart modules MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 16-4 freescale semiconductor note uart registers are accessible only as bytes. 16.3.1 uart mode registers 1 (umr1 n ) the uart mode registers 1 (umr1 n ) control configuration. umr1 n can be read or written when the mode register pointer points to it, at reset or after a reset mode register pointer command using ucr n [misc]. after umr1 n is read or written, th e pointer points to umr2 n . table 16-2 describes umr1 n fields. 0x12c 0x16c uart receiver fifo registers?(urf n ) [p. 16-4] ? 0x130 0x170 uart fractional precision divider control registers (ufpd n ) [p. 16-17] ? 0x134 0x174 (read) uart input port registers?(uip n ) [p. 16-17] ? (write) do not access. 2 ? 0x138 0x178 (read) do not access. 2 ? (write) uart output port bit set command registers?(uop1 n 3 ) [p. 16-18] ? 0x13c 0x17c (read) do not access. 2 ? (write) uart output port bit reset command registers?(uop0 n 3 ) [p. 16-18] ? 1 umr1 n , umr2 n , and ucsr n should be changed only after the receiver/transmi tter is issued a software reset command. that is, if channel operation is not disabled, undesirable results may occur. 2 this address is for factory testing. reading this location resu lts in undesired effects and possible incorrect transmission or reception of characters. register contents may also be changed. 3 address-triggered commands 7 6 543210 field rxrts rxirq/ffull err pm pt b/c reset 0000_0000 r/w r/w address mbar + 0x100 (uart0), 0x140 (uart1). after umr1 n is read or written, the pointer points to umr2 n . figure 16-2. uart mode registers 1 (umr1 n ) table 16-1. uart module programming model (continued) mbar offset [31:24] [23:16] [15:8] [7:0] uart0 uart1
uart modules MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 16-5 table 16-2. umr1 n field descriptions bits name description 7 rxrts receiver request-t o-send. allows the rts output to control the cts input of the transmitting device to prevent receiver overrun. if both the receiver and transmitter are incorrectly programmed for rts control, rts control is disabled for both. transmitt er rts control is configured in umr2 n [txrts]. 0 the receiver has no effect on rts . 1 when a valid start bit is received, rts is negated if the uart's fifo is full. rts is reasserted when the fifo has an empty position available. if rts is controlled by the fill level of the receiver fifo via uacr n [rtsl], this bit should be cleared. 6 rxirq/ff ull receiver interrupt select. 0 rxrdy is the source that generates irq. 1 ffull is the source that generates irq. if more detail on the status of the fifo is required, uisr n {rxfifo] indicates a chan ge in the fifo status as programmed in urf n [rxs]. 5 err error mode. configures the fifo status bits, usr n [rb,fe,pe]. 0 character mode. the usr n values reflect the status of the char acter at the top of the fifo. err must be 0 for correct a/d flag information when in multidrop mode. 1 block mode. the usr n values are the logical or of the status for all characters reaching the top of the fifo because the last reset error status command for the channel was issued. see section 16.3.5, ?uart command registers (ucrn) .? 4?3 pm parity mode. selects the parity or multidrop mode for the channel. the parity bit is added to the transmitted character, and the receiver performs a parity check on incoming data. the value of pm affects pt, as shown below. 2 pt parity type. pm and pt together select parity type (pm = 0x) or determine whether a data or address character is transmitted (pm = 11). pm parity mode parity type (pt= 0) parity type (pt= 1) 00 with parity even parity odd parity 01 force parity low parity high parity 10 no parity n/a 11 multidrop mode data character address character 1?0 b/c bits per character. select the number of data bits per character to be sent. the values shown do not include start, parity, or stop bits. 00 5 bits 01 6 bits 10 7 bits 11 8 bits
uart modules MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 16-6 freescale semiconductor 16.3.2 uart mode register 2 (umr2 n ) uart mode registers 2 (umr2 n ) control uart module configuration. umr2 n can be read or written when the mode register pointer points to it, which occurs after any access to umr1 n . umr2 n accesses do not update the pointer. table 16-3 describes umr2 n fields. 76543 0 field cm txrts txcts sb reset 0000_0000 r/w r/w address mbar + 0x100, 0x140. after umr1 n is read or written, the pointer points to umr2 n . figure 16-3. uart mode register 2 (umr2 n ) table 16-3. umr2 n field descriptions bits name description 7?6 cm channel mode. selects a channel mode. section 16.5.3, ?looping modes ,? describes individual modes. 00 normal 01 automatic echo 10 local loop-back 11 remote loop-back 5 txrts transmitter ready-to-send. controls negation of rts to automatically terminate a message transmission when the transmitter is disabled after completion of a transmi ssion. attempting to program a receiver and transmitter in the same channel for rts control is not permitted and disables rts control for both. 0 the transmitter has no effect on rts . 1 when the transmitter is disabled after transmission completes, setting this bit automatically clears uop[rts] one bit time after any characters in the channel transmitter shift and holding registers are completely sent, including the programmed number of stop bits. 4 txcts transmitter clear-to-send. if both txcts and txrt s are enabled, txcts controls the operation of the transmitter. 0 cts has no effect on the transmitter. 1 enables clear-to-send operation. th e transmitter checks the state of cts each time it is ready to send a character. if cts is asserted, the character is sent; if it is negated, the channel txd remains in the high state and transmission is delayed until cts is asserted. changes in cts as a character is being sent do not affect its transmission. 3?0 sb stop-bit length control. se lects the length of the stop bit appended to the transmitted character. stop-bit lengths of 9/16th to 2 bits are programmable for 6?8 bit charac ters. lengths of 1 1/16th to 2 bits are programmable for 5-bit characters. in all cases, the receiver checks only for a high condition at the ce nter of the first stop-bit position, that is, one bit time after t he last data bit or after the parity bit, if parity is enabled. if an external 1x clock is used for the transmitter, clearing bit 3 select s one stop bit and setting bit 3 selects 2 stop bits for transmission. sb 5 bits 6?8 bits sb 5 bits 6?8 bits sb 5?8 bits sb 5?8 bits 0000 1.063 0.563 0100 1.313 0.813 1000 1.563 1100 1.813 0001 1.125 0.625 0101 1.375 0.875 1001 1.625 1101 1.875 0010 1.188 0.688 0110 1.438 0.938 1010 1.688 1110 1.938 0011 1.250 0.750 0111 1.500 1.000 1011 1.750 1111 2.000
uart modules MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 16-7 16.3.3 uart status registers (usr n ) the usr n , figure 16-4 , shows status of the transmitte r, the receiver, and the fifo. table 16-4 describes usr n fields. 76543210 field rb fe pe oe txemp txrdy ffull rxrdy reset 0000_0000 r/w read only address mbar + 0x104 (usr0), 0x144 (usr1) figure 16-4. uart status registers (usr n ) table 16-4. usr n field descriptions bits name description 7 rb received break. the received break circuit detects breaks that originate in the middle of a received character. however, a break in the middle of a char acter must persist until the end of the next detected character time. 0 no break was received. 1 an all-zero character of the programmed length was received without a stop bit. rb is valid only when rxrdy = 1. only a single fifo position is occupied w hen a break is received. further entries to the fifo are inhibited until rxd returns to the high state for at least one-half bit time, which is equal to two successive edges of the uart clock. 6 fe framing error. 0 no framing error occurred. 1 no stop bit was detected when the corresponding data character in the fifo was received. the stop-bit check occurs in the middle of the first stop-b it position. fe is valid only when rxrdy = 1. 5 pe parity error. valid only if rxrdy = 1. 0 no parity error occurred. 1 if umr1 n [pm] = 0x (with parity or force parity), the corre sponding character in the fifo was received with incorrect parity. if umr1 n [pm] = 11 (multidrop), pe stores the received a/d bit. 4 oe overrun error. indicates whether an overrun occurs. 0 no overrun occurred. 1 one or more characters in the received data stream have been lost. oe is set upon receipt of a new character when the fifo is full and a character is alr eady in the shift register waiting for an empty fifo position. when this occurs, the character in the receiv er shift register and its br eak detect, framing error status, and parity error, if any, are lost. oe is cleared by the reset error status command in ucr n . 3 txemp transmitter empty. 0 the transmitter buffer is not empty. either a characte r is being shifted out, or the transmitter is disabled. the transmitter is enabled/disabled by programming ucr n [tc]. 1 the transmitter has underrun (both the transmitter holding register and transmitter shift registers are empty). this bit is set after transmission of the last stop bit of a character if there are no characters in the transmitter holding register awaiting transmission. 2 txrdy transmitter ready. 0 the cpu loaded the transmitter holding re gister or the transmitter is disabled. 1 the transmitter holding register is empty and ready fo r a character. txrdy is set when a character is sent to the transmitter shift register and when the transmit ter is first enabled. if the transmitter is disabled, characters loaded into the transmit ter holding register are not sent.
uart modules MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 16-8 freescale semiconductor 16.3.4 uart clock-select registers (ucsr n ) the uart clock-select registers (ucsr n ) select an external clock on the urt_clk input (divided by 1 or 16) or a prescaled clkin as the clocking source for the transmitter and receiver. see section 16.5.1, ?transmitter/receiver clock source .? the transmitter and r eceiver can use different clock sources. to use clkin for both, set ucsr n to 0xdd. table 16-5 describes ucsr n fields. 1 ffull fifo full. this bit is equivalent to urf[full]. 0 the fifo is not full but may hold unread characters. 1 a character was received and the receiver fifo is now full. any characters received when the fifo is full are lost. 0 rxrdy receiver ready 0 the cpu has read the receiver buffer and no ch aracters remain in the fifo after this read. 1 one or more characters were received and are waiting in the receiver buffer fifo. 7430 field rcs tcs reset 0000_0000 r/w write only address mbar + 0x104 (ucsr0), 0x144 (ucsr1) figure 16-5. uart clock-select registers (ucsr n ) table 16-5. ucsr n field descriptions bits name description 7?4 rcs receiver clock select. selects the clock source for the receiver channel. 1101 prescaled clkin 1110 urt_clk divided by 16 1111 urt_clk 3?0 tcs transmitter clock select. selects the clock source for the transmitter channel. 1101 prescaled clkin 1110 urt_clk divided by 16 1111 urt_clk table 16-4. usr n field descriptions (continued) bits name description
uart modules MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 16-9 16.3.5 uart command registers (ucr n ) the uart command registers (ucr n ), figure 16-6 , supply commands to the uart. only multiple commands that do not conflict can be specified in a single write to a ucr n . for example, reset transmitter and enable transmitter cannot be specifi ed in one write. table 16-6 describes ucr n fields and commands. examples in section 16.5.2, ?transmitter and receiver operating modes ,? show how these commands are used. 76 43210 field enab misc tc rc reset 0000_0000 r/w write only address mbar + 0x108, 0x148 figure 16-6. uart command registers (ucr n ) table 16-6. ucr n field descriptions bits value command description 7 enab ? enable autobaud 0 autobaud disabled. 1 autobaud enabled. the transmission rate is calculated from the first received character. if the rate must be recalculated, enab must first be cleared and reset. uisr n [abc] indicates a transmission rate has been calculated and loaded into the uart divider registers. udu n and udul n must be initialized to 0x00 before enabling autobaud. 6?4 misc field (this field selects a single command.) 000 no command ? 001 reset mode register pointer causes the mode register pointer to point to umr1 n . 010 reset receiver immediately disables the receiver, clears usr n [ffull,rxrdy], and reinitializes the receiver fifo pointer. no other registers are altered. because it places the receiver in a known state, use this command instead of receiver disable when reconfiguring the receiver. 011 reset transmitter disables the transmitter and clears usr n [txemp,txrdy]. no other registers are altered. because it places the transmitter in a known state, use this command instead of transmitter disable when reconfiguring the transmitter. 100 reset error status clears usr n [rb,fe,pe,oe]. also used in block mode to clear all error bits after a data block is received. 101 reset break? change interrupt clears the delta break bit, uisr n [db]. 110 start break forces txd low. if the transmitter is empty, the break may be delayed up to one bit time. if the transmitter is active, the break starts when character transmission completes. the break is delayed until any character in the tran smitter shift register is sent. any character in the transmitter holding register is sent after the break. the transmitter must be enabled for the command to be accepted. this command ignores the state of cts . 111 stop break causes txd to go high (mark) within two bit times. any characters in the transmitter buffer are sent.
uart modules MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 16-10 freescale semiconductor 16.3.6 uart receiver buffers (urb n ) the receiver buffers contai n one serial shift register and a 24-byte fifo. rxd is connected to the serial shift register. the cpu reads from the top of the st ack while the receiver shifts and updates from the bottom when the shift register is full (see figure 16-24 ). rb contains the character in the receiver. 3?2 tc field (this field selects a single command) 00 no action taken causes the transmitter to stay in it s current mode: if the transmitter is enabled, it remains enabled; if the transmitter is disabled, it remains disabled. 01 transmitter enable enables operation of the channel?s transmitter. usr n [txemp,txrdy] are set. if the transmitter is already enabled, this command has no effect. 10 transmitter disable terminates transmitter operation and clears usr n [txemp,txrdy]. if a character is being sent when the transmitter is disabled, transmission completes before the transmitter becomes inactive. if the transmitter is already disabled, the command has no effect. 11 ? reserved, do not use. 1?0 rc (this field selects a single command) 00 no action taken causes the receiver to stay in its current mode. if the receiver is enabled, it remains enabled; if disabled, it remains disabled. 01 receiver enable if the uart module is not in multidrop mode (umr1 n [pm] | 11), receiver enable enables the channel's receiver and forces it into search-for-start-bit state. if the receiver is already enabled, this command has no effect. 10 receiver disable disables the receiver immediatel y. any character being received is lost. the command does not affect receiver status bits or other control registers. if the uart module is programmed for local loop-back or multidrop mode, the receiver operates even though this command is selected. if the receiver is already disabled, the command has no effect. 11 ? reserved, do not use. 7 0 field rb reset 0000_0000 r/w read only address mbar + 0x10c,0x14c figure 16-7. uart receiver buffer (urb n ) table 16-6. ucr n field descriptions (continued) bits value command description
uart modules MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 16-11 16.3.7 uart transmitter buffers (utb n ) the transmitter buffers consist of a 24-byte fifo and the transmitter shift register. the fifo accepts characters from the bus ma ster if the channel?s usr n [txrdy] is set. a write to the transmitter buffer clears txrdy, inhibiting any more ch aracters until the fifo can accept mo re data. when the shift register is empty, it checks if the holding re gister has a valid character to be se nt (txrdy = 0). if there is a valid character, the shift regist er loads it and sets usr n [txrdy] again. writes to th e transmitter buffer have no effect when the channel?s txrdy = 0 a nd when the transmitter is disabled. figure 16-8 shows utb n . tb contains the character in the transmitter buffer. 16.3.8 uart input port change registers (uipcr n ) the input port change registers (uipcr n ), figure 16-9 , hold the current state a nd the change-of-state for cts . table 16-7 describes uipcr n fields. 7 0 field tb reset 0000_0000 r/w write only address mbar + 0x10c,0x14c figure 16-8. uart transmitter buffers (utb n ) 7 543 10 field ? cos 111 cts reset 0000_011 cts r/w read only address mbar + 0x110 (uipcr0), 0x150 (uipcr1) figure 16-9. uart input port change registers (uipcr n ) table 16-7. uipcr n field descriptions bits name description 7?5 ? reserved, should be cleared. 4 cos change of state (high-to-low or low-to-high transition). 0 no change-of-state since the cpu last read uipcr n . reading uipcr n clears uisr n [cos]. 1 a change-of-state longer than 25?50 s occurred on the cts input. uacr n can be programmed to generate an interrupt to the cpu when a change of state is detected. 3?1 ? reserved, should be cleared. 0 cts current state. starting two serial clock periods after reset, cts reflects the state of cts . if cts is detected asserted at that time, cos is set, which initiates an interrupt if uacr n [iec] is enabled. 0 the current state of the cts input is asserted. 1 the current state of the cts input is negated.
uart modules MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 16-12 freescale semiconductor 16.3.9 uart auxiliary control registers (uacr n ) the uart auxiliary cont rol registers (uacr n ), figure 16-10 , control the input enable as well as the rts control based on the receiver fifo level. table 16-8 describes uacr n fields. 16.3.10 uart interrupt status/mask registers (uisr n /uimr n ) the uart interrupt status registers (uisr n ), figure 16-11 , provide status for al l potential interrupt sources. uisr n contents are masked by uimr n . if corresponding uisr n and uimr n bits are set, the internal interrupt output is asserted. if a uimr n bit is cleared, the state of the corresponding uisr n bit has no effect on the output. note true status is pr ovided in the uisr n regardless of uimr n settings. uisr n is cleared when the uart module is reset. 73210 field ? rtsl iec reset 0000_0000 r/w write only address mbar + 0x110 (uacr0), 0x150 (uacr1) figure 16-10. uart auxiliary control registers (uacr n ) table 16-8. uacr n field descriptions bits name description 7?3 ? reserved, should be cleared. 2?1 rtsl rts level. determines when rts is negated by the receiver relative to the fullness of the receiver fifo. note that rts must first be manually asserted by a write to uop0 n . 00 fifo level control disabled 01 receiver fifo ? 25% full 10 receiver fifo ? 50% full 11 receiver fifo ? 75% full receiver overrun can be prevented by using the rts output to control the cts input of the transmitting device. attempting to program a receiver and transmitter in the same channel for rts control is not permitted and disables rts control for both. 0 iec input enable control. 0 setting the corresponding uipcr n bit has no effect on uisr n [cos]. 1 uisr n [cos] is set and an interrupt is generated when the uipcr n [cos] is set by an external transition on the cts input (if uimr n [cos] = 1).
uart modules MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 16-13 table 16-9 describes uisr n and uimr n fields. 76 32 1 0 field cos abc rxfifo txfifo rxfto db ffull/rxrdy txrdy reset 0000_0000 r/w read only for status, write only for mask. address mbar + 0x114 (uisr0), 0x154 (uisr1); mbar + 0x114 (uimr0), 0x154 (uimr1) figure 16-11. uart interrupt status/mask registers (uisr n /uimr n ) table 16-9. uisr n /uimr n field descriptions bits name description 7 cos change-of-state. 0uipcr n [cos] is not selected. 1 change-of-state occurred on cts and was programmed in uacr n [iec] to cause an interrupt. 6 abc autobaud calculation. 0 autobaud is disabled or is waiting for the first receiver character. 1 the baud rate has been calculated and loaded into the clock source divider (udu n and udl n ). after being set, this bit is cleared by writing to ucr n [enab]. 5 rxfifo receiver fifo status. after being se t, this bit is cleared by reading urb n . 0 fifo status indication is disabled or the receiver status has not changed. 1 the receiver status has changed as programmed in urf n [rxs]. 4 txfifo transmitter fifo status. after being set, this bit is cleared by writing utb n . 0 fifo status indication is disabled or the transmitter status has not changed. 1 the transmitter status has changed as programmed in utf n [txs]. 3 rxfto receiver fifo timeout. 0 no receiver fifo timeout. this bit is cleared by re ading all remaining data in the receiver fifo, by receiving another character into the fifo, or if the re ceiver is disabled. the count to timeout is restarted when rxfto is cleared. 1 the receiver fifo has timed out at 64 baud with unread data below the fifo fullness level. 2 db delta break. 0 no new break-change condition to report. section 16.3.5, ?uart command registers (ucrn) ,? describes the reset break - change interrupt command. 1 the receiver detected the begin ning or end of a received break. 1ffull/r xrdy rxrdy (receiver ready) if umr1 n [ffull/rxrdy] = 0; fifo full (ffull) if umr1 n [ffull/rxrdy] = 1. duplicate of usr n [ffull/rxrdy]. 0 txrdy transmitter ready. this bit is the duplication of usr n [txrdy]. 0 the transmitter holding register was loaded by the cpu or the transmitter is disabled. characters loaded into the transmitter holding register when txrdy = 0 are not sent. 1 the transmitter holding register is empty and ready to be loaded with a character.
uart modules MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 16-14 freescale semiconductor 16.3.11 uart divider upper/lower registers (udu n /udl n ) the udu n registers (formerly called ubg1 n ) hold the msb, and the udl n registers (formerly ubg2 n ) hold the lsb of the preload value. udu n and udl n concatenate to provide a divider to clkin for transmitter/receiver ope ration, as described in section 16.5.1.2.1, ?clkin baud rates .? note the minimum value that can be lo aded on the concatenation of udu n with udl n is 0x0002. both udu n and udl n are write-only and cannot be read by the cpu. 16.3.12 uart autobaud registers (uabu n /uabl n ) the uabu n registers hold the msb, and the uabl n registers hold the lsb of the calculated baud rate. if ucr n [enab] is set, the value in these registers is automatically loaded into udu n and udl n . 7 0 field divider msb reset 0000_0000 r/w write only address mbar + 0x118 (udu0), 0x158 (udu1) figure 16-12. uart divider upper registers (udu n ) 7 0 field divider lsb reset 0000_0000 r/w write only address mbar + 0x11c (udl0), 0x15c (udl1) figure 16-13. uart divider lower registers (udl n ) 7 0 field autobaud msb reset 0000_0000 r/w read only address mbar + 0x120 (uabu0), 0x160 (uabu1) figure 16-14. uart autobaud upper registers (uabu n ) 7 0 field autobaud lsb reset 0000_0000 r/w read only address mbar + 0x124 (uabl0), 0x164 (uabl1) figure 16-15. uart autobaud lower registers (uabl n )
uart modules MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 16-15 16.3.13 uart transmitter fifo registers (utf n ) the utf n registers contain control and status bits for th e transmitter fifo. note that some bits are read-only. table 16-10 describes utf n fields. 7654 0 field txs full txb reset 1100_0000 r/w r/w r r address mbar + 0x128 (utf0), 0x168 (utf1) figure 16-16. uart transmitter fifo registers (utf n ) table 16-10. utf n field descriptions bits name description 7?6 txs transmitter status . when written to, these bits control the meaning of uisr n [txfifo]. 00 inhibit transmitter fifo status indication in uisr n . 01 transmitter fifo ? 25% empty 10 transmitter fifo ? 50% empty 11 transmitter fifo ? 75% empty when read, these bits indicate the emptiness level of the fifo. 00 transmitter fifo < 25% empty 01 transmitter fifo ? 25% empty 10 transmitter fifo ? 50% empty 11 transmitter fifo ? 75% empty 5 full transmitter fifo full. 0 transmitter fifo is not full and can be loaded with a character. 1 transmitter fifo is full. characters loaded into th e transmitter fifo when it is full are not transmitted. 4?0 txb transmitter buffer data level. indicates the number of bytes, between 0 and 24, stored in the transmitter fifo.
uart modules MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 16-16 freescale semiconductor 16.3.14 uart receiver fifo registers (urf n ) the urf n registers contain control a nd status bits for the receiver fifo. note that some bits are read only. table 16-11 describes urf n fields. 7654 0 field rxs full rxb reset 0000_0000 r/w r/w r r address mbar + 0x12c (urf0), 0x16c (urf1) figure 16-17. uart receiver fifo registers (urf n ) table 16-11. urf n field descriptions bits name description 7?6 rxs receiver status . when written to, these bits control the meaning of uisr n [rxfifo]. 00 inhibit receiver fifo status indication in uisr n . 01 receiver fifo ? 25% full 10 receiver fifo ? 50% full 11 receiver fifo ? 75% full when read, these bits indicate the emptiness level of the fifo. 00 receiver fifo < 25% full 01 receiver fifo ? 25% full 10 receiver fifo ? 50% full 11 receiver fifo ? 75% full 5 full receiver fifo full. 0 receiver fifo is not full and can be loaded with a character. 1 receiver fifo is full. characters loaded from the receiver when the fifo is full are lost. this bit is identical to usr n [ffull]. 4?0 rxb receiver buffer data level. indicates the number of bytes, between 0 and 24, stored in the receiver fifo.
uart modules MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 16-17 16.3.15 uart fractional precision divider control registers (ufpd n ) the ufpd n registers allow greater accuracy when derivi ng a transmitter/receiver clock source from clkin. the use of the ufpd n registers is optional; if the contents ar e left in the reset state, code written for other coldfire devices contai ning uart modules will not be affe cted by the addition of these registers. the contents of these registers allow the fr equency to be divided by a factor of up to 16. when autobaud is used, these registers are updated automati cally to reflect the clock rate being used. host software can write to these registers to ma ke fine adjustments to the clock rate. see section 16.5.1.2, ?calculating baud rates ,? for an example of ufpd n programming. table 16-12 describes ufpd n fields. 16.3.16 uart input port registers (uip n ) the uip registers, figure 16-19 , show the current state of the cts input. table 16-13 describes uip n fields. 743 0 field ? fd reset 0000_0000 r/w r/w address mbar + 0x130 (ufpd0), 0x170 (ufpd1) figure 16-18. uart fractional precisi on divider control registers (ufpd n ) table 16-12. ufpd n field descriptions bits name description 7?4 ? reserved, should be cleared. 3?0 fd fractional divider. the value of these bits, from 0 to 15, determine the scale factor by which the clocking source for the transmitter and/or receiver is scaled. 7 10 field ? cts reset 1111_1111 r/w read only address mbar + 0x134 (uip0), 0x174 (uip1) figure 16-19. uart input port registers (uip n ) table 16-13. uip n field descriptions bits name description 7?1 ? reserved, should be cleared. 0ctscts state.the cts value is latched and reflects th e state of the input pin when uip n is read. note: this bit has the same function and value as uipcr n [rts]. 0 the current state of the cts input is logic 0. 1 the current state of the cts input is logic 1.
uart modules MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 16-18 freescale semiconductor 16.3.17 uart output port command registers (uop1 n /uop0 n ) the rts output can be asserted by writing a 1 to uop1 n [rts] and negated by writing a 1 to uop0 n [rts]. see figure 16-20 . table 16-14 describes uop1 and uop0 fields. 16.4 uart module signal definitions figure 16-21 shows both the external and internal signal groups. figure 16-21. uart block diagram showing external and internal interface signals 7 10 field ? rts reset 0000_0000 r/w write only addr uart0: mbar + 0x138 (uop1), 0x13c (uop0); uart1 0x178 (uop1), 0x17c (uop0) figure 16-20. uart output port command registers (uop1/uop0) table 16-14. uop1/uop0 field descriptions bits name description 7?1 ? reserved, should be cleared. 0 rts output port parallel output. controls assertion (uop1)/negation (uop0) of rts output. 0 not affected. 1 asserts rts (uop1). negates rts (uop0). internal receive buffer transmit buffer input port output port interface uart module address bus control control logic or internal bus data to cpu irq to interrupt controller (sim) external interface signals clkin clock source generator urt_cts urt_rts urt_rxd urt_txd external clock (urt_clk) 24-character 24-character
uart modules MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 16-19 an internal interrupt request signal (irq ) is provided to notify the interr upt controller of an interrupt condition. the output is the l ogical nor of unmasked uisr n bits. the interrupt levels of the uart modules are programmed in sim register icr2. see section 7.2, ?interrupt controller registers .? table 16-15 briefly describes th e uart module signals. note the terms ?assertion? and ?negation? are used to avoid confusion between active-low and active-high signals. ?ass erted? indicates that a signal is active, independent of the voltage level; ?negated? indicates that a signal is inactive. figure 16-22 shows a signal configurati on for a uart/rs-232 interface. figure 16-22. uart/rs-232 interface 16.5 operation this section describes operation of the clock source generator, tran smitter, and receiver. 16.5.1 transmitter/receiver clock source clkin serves as the basic timing reference for the cloc k source generator logic, which consists of a clock generator and a programma ble 16+4-bit divider (udu , udl, ufpd) dedicated to the uart. the clock generator cannot produce standard ba ud rates if clkin is used, so th e 16-bit divider should be used. table 16-15. uart module signals signal description transmitter serial data output (urt_txd) urt_txd is held high (mark condition) when the transmitter is disabled, idle, or operating in the local loop-back mode. data is shifted out on urt_txd on th e falling edge of the clock source, with the least significant bit (lsb) sent first. receiver serial data input (urt_rxd) data received on urt_rxd is sampled on the rising edge of the clock source, with the lsb received first. clear-to-send (urt_ cts ) this input can generate an interrupt on a change of state. request-to-send (urt_ rts ) this output can be programmed to be negated or asse rted automatically by either the receiver or the transmitter. it can control serial data flow when connected to a transmitter?s cts . clock (urt_clk) the uart?s external clock source. it can be used in 1x or 16x mode. when both the transmitter and receiver use the timer as the clock source (ucr = 0x dd), the 16x clock is driven out on uartclk. if either the transmitter or receiver use an ex ternal clock (1x or 16x), urt_clk is an input. do2 di1 di2 do1 rs-232 transceiver uart urt_rts urt_cts urt_txd urt_rxd
uart modules MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 16-20 freescale semiconductor 16.5.1.1 programmable divider as figure 16-23 shows, the uart transmitter and recei ver can use the following clock sources: ? an external clock signal on the urt_clk pin that can be divided by 16. when not divided, urt_clk provides a synchronous clock mode ; when divided by 16, it is asynchronous . ? clkin supplies an asynchronous cl ock source that is prescaled by 32 and then divided by the 16-bit value programmed in udu n and udl n . see section 16.3.11, ?uart divider upper/lower registers (udun/udln) .? the precision of this clock source can be tuned using the 4-bit value programmed in ufpd n . note that when autobaud mode is enabled, the ufpd n , udu n , and udl n are automatically loaded with the calculated baud rate. however, the calculated value can be overr idden by a programmed value at any time. the choice of urt_clk or clki n is programmed in the ucsr. figure 16-23. clocking source diagram 16.5.1.2 calculati ng baud rates the following sections describe how to calculate baud rates. 16.5.1.2.1 clkin baud rates when clkin is the uart clocking source, it goe s through a divide-by-32 pr escaler and then passes through the 16-bit divider of the concatenated udu n and udl n registers. the ufpd register can be used uart x1 prescaler x16 prescaler clock generator 4-bit divider 16-bit prescaler clocking sources programmed in ucsr urt_clk urt_txd urt_rxd tx rx rx buffer tx buffer clkin 1-bit divider (udu, udl) (ufpd)
uart modules MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 16-21 to improve the accuracy of the cl ock source as shown in the foll owing example using a 48 mhz clkin and 230kbs uart baud rate: 1. uart divider= clkin / (16 x 2 x uart baud rate) = 48e06 / (32 x 230e03) = 6.52 = 6 (truncate to lowest whole number) udu = 0x00, udl = 0x06 2. the truncation has resulted in an effective 8.7% error (0.52/6) 3. using the formula fractional divi der = (truncated remainder * 16) = 0.52 * 16 = 8.32 = 8 (truncate to nearest whole number) ufpd = 0x08 4. this now gives an effective total error in the baud rate as: %error = 100 x (truncated remai nder) / (16 x (ud + ufpd/16)] = 100 x 0.32 / (16 x (6 + 8/16)) = 32 / 104 = 0.31% 16.5.1.2.2 external clock an external source clock (urt_clk) can be used as is or divided by 16. 16.5.1.2.3 autobaud detection the uart can determine the clock rate of a received character stream from the timing of the received pattern. if ucr n [enab] is set, the autobaud detector searches for a low level on urt_rxd, indicating a start bit. start-bit length is measur ed until urt_rxd returns to a high le vel, then the transmission rate is calculated and loaded into udu n , udl n , and ufpd n . the calculated transmission rate can be determined by reading uabu n and uabl n . errors may occur in the calculation of high transmission rates due to dist ortion effects from the external drivers. if the calculated rate is inaccurate, udu n , udl n , and ufpd n must be written with the appropriate value as soon as possible to ensure that characters are properly received by the uart. the fi rst character is always correctly captured, even though the tran smission rate is not yet calculated. the first character must be an odd char acter such as ?a? or ?a? to ensure that it contains an isolated start bit. the parity mode can be determined by monito ring subsequent characters. the process for using the aut obaud detector is as follows: ? udu n , udl n , and ufpd n must be initialized to 0x00. ? the receiver and transmit ter clock sources must be set to timer (ucsr = 0xdd). ? autobaud must be enabled (ucr[enab] = 1). ? the receiver must be enabled (ucr[rc] = 01). baudrate externalclockfrequency 16or1 --------------------------------------------------------------------- =
uart modules MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 16-22 freescale semiconductor once enabled, the autobaud detector can calculate the transmission rate only once. if a new calculation is required, ucr[enab] must first be cleared and then set again. thus, a new uart connection cannot be hot-plugged into an active uart connect ion if that connection is operating at a differ ent rate without first reinitializing the autobaud detector. 16.5.2 transmitter and r eceiver oper ating modes figure 16-24 is a functional block diagra m of the transmitter and receiver showing the command and operating registers, which are descri bed generally in the following sect ions and described in detail in section 16.3, ?register descriptions .? figure 16-24. transmitter and receiver functional diagram 16.5.2.1 transmitting the transmitter is enabled thr ough the uart command register (ucr n ). when it is ready to accept a character, the uart sets usr n [txrdy]. the transmitter converts parallel data fr om the cpu to a serial bit stream on txd. it automatically sends a start bit followed by the pr ogrammed number of data bits, an optional parity bit, and the programmed number of st op bits. the lsb is sent first. data is shifted from the transmitter output on the falli ng edge of the clock source. after the stop bits are sent, if no new character is in the transmitter holdi ng register, the txd output remains high (mark condition) and the transmitter empty bit, usr n [txemp], is set. transmission resumes and txemp is cleared when the cpu loads a new character into the uart transmitter buffer (utb n ). if the transmitter receives a disable co mmand, it continues until any characte r in the transmitter shift register is completely sent. uart command register (ucr0) w uart status register (usr0) r transmitter shift register uart mode register 1 (umr1) r/w uart mode register 2 (umr2) r/w transmitter fifo w receiver shift register receiver fifo r uart external interface rxd txd uart transmit fifo (utb) (24 bytes) uart receive fifo (urb) (24 bytes)
uart modules MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 16-23 if the transmitter is reset through a software command, opera tion stops immediately (see section 16.3.5, ?uart command registers (ucrn) ?). the transmitter is reenabled through the ucr n to resume operation after a disabl e or software reset. if the clear-to-send ope ration is enabled, cts must be asserted for the character to be transmitted. if cts is negated in the middle of a transm ission, the character in the shift regi ster is sent and txd remains in mark state until cts is reasserted. if the transm itter is forced to send a c ontinuous low condition by issuing a start break command, the transmitter ignores the state of cts . if the transmitter is programmed to automatically negate rts when a message transmission completes, rts must be asserted manually before a message is se nt. in applications in which the transmitter is disabled after transmissi on is complete and rts is appropriately programmed, rts is negated one bit time after the character in the shift register is comple tely transmitted. the transmitter must be manually reenabled by reasserting rts before the next message is to be sent. the transmitter must be enabled prior to accepting a start break command. if the transmitter is disabled while the break is active, the brea k is not terminated. the break can only be terminated by using the stop break command. figure 16-25 shows the functional timing information for the transmitter. figure 16-25. transmitter timing c1 1 c2 c3 break c4 c6 txd transmitter enabled usr n [txrdy] w 2 wwwwwww cts 3 rts 4 manually asserted by bit - set command manually asserted start break c5 not transmitted c6 c4 stop break c3 c2 c1 1 c1 in transmission 3 umr2 n [txcts] = 1 1 c n = transmit characters 2 w = write 4 umr2 n [txrts] = 1 internal module select
uart modules MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 16-24 freescale semiconductor 16.5.2.2 receiver the receiver is enabled through its ucr n , as described in section 16.3.5, ?uart command registers (ucrn) .? figure 16-26 shows receiver functional timing. figure 16-26. receiver timing when the receiver detects a high-to-l ow (mark-to-space) transition of the start bit on rxd, the state of rxd is sampled each 16 clock for eight clocks, starting one-hal f clock after the transition (asynchronous operation) or at the next rising edge of the bit time clock (synchronous operation). if rxd is sampled high, the start bit is invalid and the search for the valid start bit begins again. if rxd is still low, a valid start bit is assumed and th e receiver continues sampling the input at one-bit time intervals, at the theoretical center of the bit, until th e proper number of data bits and parity, if any, is assembled and one stop bit is dete cted. data on the rxd input is sa mpled on the rising edge of the programmed clock source. the lsb is received first. the data is then transferred to a receiver holding register and usr n [rxrdy] is set. if the character is less than eight bits , the most signifi cant unused bits in the receiver holding register are cleared. after the stop bit is detected, the re ceiver immediately looks for the next start bit. however, if a non-zero character is received without a stop bit (framing error) and rxd remains low for one-half of the bit period after the stop bit is sampled, the receiver operates as if a new start bit were detect ed. parity error, framing error, overrun error, and received br eak conditions set the respective pe, fe, oe, rb error, and break flags in the usr n at the received character boundary and are valid only if usr n [rxrdy] is set. if a break condition is detect ed (rxd is low for the entire character including the stop bit), a character of all zeros is loaded into the receiver holding register (rhr) and usr n [rb,rxrdy] are set. rxd must return to a high condition for at least one-half bit ti me before a search for the next start bit begins. c1 c2 c25 c27 c28 c29 c3 c26 c26, c27, and c82 are lost (c2) status data (c3) status data (c4) status data c26 is lost reset by command rxd receiver enabled usr n [rxrdy] overrun rts 4 internal module select usr n [ffull] (c1) status data usr n [oe] automatically asserted when ready to receive manually asserted first time, automatically negated if overrun occurs uop0[rts] = 1
uart modules MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 16-25 the receiver detects the beginning of a break in the middle of a character if the break pe rsists through the next character time. if the break begins in the mi ddle of a character, the r eceiver places the damaged character in the rx fifo stac k and sets the corresponding usr n error bits and usr n [rxrdy]. then, if the break lasts until the next character time, the receive r places an all-zero charac ter into the rx fifo and sets usr n [rb,rxrdy]. 16.5.2.3 transmitter fifo whenever the cpu writes a characte r for transmission into utb, the character is placed into the 24-byte transmitter fifo. utb fills the last spot in the fi fo and holds the last character to be transmitted. visibility into the status of th e fifo is provided by various bi ts and interrupts, as shown in table 16-16 . 16.5.2.4 receiver fifo the fifo stack is used in the uart ?s receiver buffer logic. the fifo is 24 bytes deep. the receive buffer consists of the fifo and a receiver shift register c onnected to the rxd (see figure 16-24 ). data is assembled in the receiver shift regi ster and loaded into the top empty receiver holding regi ster position of the fifo. similar to the transmitter, several status bits and interrupts provide visibi lity into the status of the fifo. in addition to the data byt e, three status bits, pari ty error (pe), framing erro r (fe), and received break (rb), are appended to each data character in the fifo; oe (overrun error) is not appended. by programming the err bit in the channel?s mode register (umr1 n ), status is provided in character or block modes. usr n [rxrdy] is set when at least one character is availa ble to be read by the cpu. a read of the receiver buffer produces an output of data from the top of the fifo stack. after th e read cycle, the data at the top of the fifo stack and its as sociated status bits are popped and the receiver shif t register can add new data at the bottom of the stack. the fifo-f ull status bit (ffull) is set if all 24 stack pos itions are filled with data. either the rxrdy or ffull bit can be selected to cause an interrupt. the two error modes are selected by umr1 n [err] as follows: ? in character mode (umr1 n [err] = 0), status is given in the usr n for the character at the top of the fifo. ? in block mode, the usr n shows a logical or of all character s reaching the top of the fifo stack since the last reset error status command. status is updated as characters reach the top of the fifo stack. block mode offers a data-reception speed advantage where the software overhead of error-checking each character cannot be tolerated. ho wever, errors are not detected until the check is performed at the end of an entire message?the faulting character in the block is not identified. table 16-16. transmitter fifo status bits status bit indicated condition interrupt usr[txemp] = 1 the transmitter fifo and shift register are empty and a data underrun occurred. usr[txrdy] = 1 at least one fifo stage is available for a character to be transmitted. if this bit is cleared, the fifo is full and a subsequent wr ite to the fifo will be ignored. ye s usr[ffull] = 1 the programm ed level of emptiness (utf [txs]) has been reached. yes utf[txs] indicates the level of em ptiness of the transmitter fifo utf[txb] indicates the number of char acters, 0?24, in the transmitter fifo
uart modules MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 16-26 freescale semiconductor in either mode, reading the usr n does not affect the fifo. the fifo is popped only when the receive buffer is read. the usr n should be read before reading the re ceive buffer. if all 24 receiver holding registers are full, a new character is held in the receive r shift register until space is available. however, if a second new character is received, the ch aracter in the receiver shift regist er is lost, the fifo is unaffected, and usr n [oe] is set when the receiver detects th e start bit of the new overrunning character. visibility into the status of th e fifo is provided by various bi ts and interrupts, as shown in table 16-17 . to support flow control, the rece iver can be programmed to automa tically negate and assert rts , in which case the receiver automatically negates rts when a valid start bit is detect ed and the fifo stack is full. the receiver asserts rts when a fifo position becomes availabl e; therefore, overrun errors can be prevented by connecting rts to the cts input of the transmitting device. note the receiver can still read characters in the fifo stack if the receiver is disabled. if the receiver is reset, the fifo stack, rts control, all receiver status bits, and interrupt requests are re set. no more characters are received until the receiver is reenabled. 16.5.3 looping modes the uart can be configured to operate in various looping modes as shown in figure 16-26 . these modes are useful for local and remote syst em diagnostic functions and are described in th e following paragraphs and in section 16.3, ?regis ter descriptions .? the uart?s transmitter and receiver should be disabled when switching between modes, as the selected mode is activated immediately upon m ode selection, regardless of whet her a character is being received or transmitted. table 16-17. receiver fifo status bits status bit indicated condition interrupt usr[ffull] = 1 all fifo pos itions contain data yes usr[rxrdy] = 1 at least one character is available to be read by the cpu. yes usr[rxfifo] = 1 the programmed level of fullness (utf[rxs]) has been reached. yes usr[rxfto] = 1 the receiver fifo ho lds unread data, and the fifo status has not changed in at least 64 receiver clocks. ye s urf[rxs] indicates the level of fullness of the receiver fifo urf[rxb] indicates the number of charac ters, 0?24, in the receiver fifo.
uart modules MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 16-27 16.5.3.1 automatic echo mode in automatic echo mode, shown in figure 16-27 , the uart automatically rese nds received data bit by bit. the local cpu-to-receiver communi cation continues normally, but th e cpu-to-transmitter link is disabled. in this mode, received data is clocked on the receiver clock and resent on txd. the receiver must be enabled, but the transmitter need not be. figure 16-27. automatic echo because the transmitter is inactive, usr n [txemp,txrdy] are inactive and data is sent as it is received. received parity is checked but is not recalculated for transmission. char acter framing is also checked, but stop bits are sent as they are recei ved. a received break is echoed as rece ived until the next valid start bit is detected. autobaud operation does not affect automatic echo mode; that is, the first character received is correctly echoed back. 16.5.3.2 local loop-back mode figure 16-28 shows how txd and rxd are internally connected in local loop-back mode. this mode is for testing the operation of a local uar t module channel by sending data to the transmitter and checking data assembled by the receiver to ensure proper operations. figure 16-28. local loop-back features of this local loop- back mode are as follows: ? transmitter and cpu-to-rece iver communications continue normally in this mode. ? rxd input data is ignored ? txd is held marking ? the receiver is clocked by the transmitter clock. the transmitter must be enabled, but the receiver need not be. 16.5.3.3 remote loop-back mode in remote loop-back mode, shown in figure 16-29 , the channel automatically tr ansmits received data bit by bit on the txd output. the local cpu-to-transmitter li nk is disabled. this mode is useful in testing receiver and transmitter operation of a remote channel. for this mode, the transmitter uses the receiver clock. cpu disabled disabled rxd input txd input tx rx cpu disabled disabled rxd input txd input tx rx
uart modules MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 16-28 freescale semiconductor because the receiver is not active, received data ca nnot be read by the cpu and error status conditions are inactive. received parity is not check ed and is not recalculated for transm ission. stop bits ar e sent as they are received. a received break is echoed as receive d until the next valid start bit is detected. figure 16-29. remote loop-back 16.5.4 multidrop mode setting umr1 n [pm] programs the uart to ope rate in a wake-up mode for multidrop or multiprocessor applications. in this mode, a mast er can transmit an address charac ter followed by a block of data characters targeted for one of up to 256 slave stations. although slave stations have their ch annel receivers disabled, they cont inuously monitor the master?s data stream. when the master sends an address character, the sl ave receiver channel notif ies its respective cpu by setting usr n [rxrdy] and generating an interrupt (if programmed to do so). each sl ave station cpu then compares the received address to its station addre ss and enables its receiver if it wishes to receive the subsequent data characters or block of data from the master station. sl ave stations not a ddressed continue monitoring the data stream. data fiel ds in the data stream are separate d by an address character. after a slave receives a block of data, it s cpu disables the receiver and re peats the process.functional timing information for multidrop mode is shown in figure 16-30 . a character sent from the master st ation consists of a start bit, a programmed number of data bits, an address/data (a/d) bit flag, and a programmed number of stop bits. a/d = 1 indicates an address character; a/d = 0 indicates a data character. the polarity of a/d is selected through umr1 n [pt]. umr1 n should be programmed before enabling the transmitter and load ing the corresponding data bits into the transmit buffer. in multidrop mode, the receiver continuously monitors the received data stream, regardless of whether it is enabled or disabled. if the receiver is disabled, it sets the rxrdy bit and loads the character into the receiver holding register fifo stack provided the received a/d bit is a one (address tag). the character is discarded if the received a/d bit is zero (data tag). if the receiver is enabled, all received characters are transferred to the cpu through the receiver hol ding register stack during read operations. in either case, the data bits are loaded into the data portion of the stack while the a/d bit is loaded into the status portion of the stack normall y used for a parity error (usr n [pe]). detection of breaks and fr aming or overrun errors operates normally. the a/d bit replaces the parity bit, so parity is neither calculated no r checked. messages in this mode ma y still contain error detection and correction information. if 8- bit characters are not requi red, software can be used to calculate parity and append it to the 5-, 6- , or 7-bit character. cpu disabled disabled rxd input txd input tx rx disabled disabled
uart modules MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 16-29 figure 16-30. multidrop mode timing diagram 16.5.5 bus operation this section describes bus operati on during read, write, and interrupt acknowledge cycles to the uart module. 16.5.5.1 read cycles the uart module responds to reads with byte data. reserved registers return zeros. 16.5.5.2 write cycles the uart module accepts write data as bytes. write cycl es to read-only or reserved registers complete normally without exception pro cessing, but data is ignored. 16.5.5.3 interrupt acknowledge cycles an internal interrupt request signa l notifies the interrupt controller of any unmasked interrupt conditions. the interrupt priority level is programmed in icr2. add1 txd transmitter enabled usr n [txrdy] c0 add2 11 internal module select a/d a/d a/d add1 rxd receiver enabled usr n [rxrdy] c0 add2 11 internal module select a/d a/d a/d 0 a/d 0 a/d (c0) status data (add 2) status data add 1 peripheral station master station umr1 n [pm] = 11 umr1 n [pm] = 11 umr1 n [pt] = 1 add 1 umr1 n [pt] = 0 c0 umr1 n [pt] = 2 add 2 umr1 n [pm] = 11
uart modules MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 16-30 freescale semiconductor 16.5.6 programming the software flowchart, figure 16-31 , consists of the following: ? uart module initialization?these routines consist of sinit and chchk (sheets 1 and 2). before sinit is called at system initializat ion, the calling rou tine allocates 2 wo rds on the system stack. on return to the calling routine, sinit pass es uart status data on the stack. if sinit finds no errors, the transmitter and receiver are enab led. sinit calls chchk to perform the checks. when called, sinit places the uart in local loop-back mode and checks for the following errors: ? transmitter never ready ? receiver never ready ? parity error ? incorrect character received ? i/o driver routine?this routine (sheets 4 and 5) consists of inch, the terminal input character routine which gets a character from the receiver, and outch, which sends a character to the transmitter. ? interrupt handling?consists of sirq (sheet 4), which is executed after the uart module generates an interrupt caused by a change-in-break (beginning of a break). sirq then clears the interrupt source, waits for the ne xt change-in-break interrupt (end of break), clears the interrupt source again, then returns from excepti on processing to th e system monitor. 16.5.6.1 uart module initialization sequence note uart module registers can be accesse d by word or byte operations, but only data byte d[7:0] is valid. figure 16-31 shows the uart module initialization sequence. figure 16-31. uart mode programming flowchart (sheet 1 of 5)
uart modules MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 16-31 figure 16-31. uart mode programming flowchart (sheet 2 of 5)
uart modules MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 16-32 freescale semiconductor figure 16-31. uart mode programming flowchart (sheet 3 of 5)
uart modules MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 16-33 figure 16-31. uart mode programming flowchart (sheet 4 of 5)
uart modules MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 16-34 freescale semiconductor figure 16-31. uart mode programming flowchart (sheet 5 of 5)
MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 17-1 chapter 17 general purpose i/o module this chapter describes the opera tion and programming model of the three general-purpose i/o (gpio) ports on the MCF5272. it includes de tails about pin assignment, direct ion-control, and data registers. 17.1 overview the MCF5272 provides up to 48 general-purpose i/o signals. the gp io signal multiple xing is shown in table 17-1 . all gpio pins are individually programmable as inputs or outputs . at reset, all configurable multifunction gpio pins default to general purpose i nputs and all multifunction pi ns that are not shared with a gpio pin default to high impedance. to avoid indeterminate read values and reduce power consumption, internal pull-up resist ors are active immediately upon rese t, and remain active until the corresponding port direction registers are programmed. the general-purpose i/o signals are configured as three ports, each having up to 16 signals. these three general-purpose i/o ports are shared with other signals as follows: control registers for each port sel ect the function (gpio or peripheral pin) assigned to each pin. pins can have as many as four functions including gpio. there is no configuration regi ster for gpio port c because its pins are configured by wsel during device reset. an additional port, port d, has only a control register which is used to confi gure the pins that are not multiplexed with any gpio signals. table 17-1. gpio signal multiplexing gpio signal also multiplexed on the same pins pa[6:0] external usb transceiver interface signals pa7 qspi_cs3 and dout3 pa[15:8] plic tdm ports 0 and 1 pb[7:0] uart1 signals and the bus control signal ta pb[15:8] ethernet controller signals pc[15:0] data bus signals d[15: 0]. these are only available (as gpio) when the device is configured for 16-bit data bus mode using the wsel signal
general purpose i/o module MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 17-2 freescale semiconductor 17.2 port control registers the port control registers are used to configure all pins that carry signals multiplexed from different on-chip modules. each pin is conf igured with a two-bit field. pi n functions are referred to as function 0b00?0b11. the function 0 si gnals corresponding to gpio por ts a and b are immediately available after reset. wherever a signal function includes a gpio port bit, the function defaults to an input after a reset and can be read in the correspo nding port data register. pin functions are generally grouped logically. for ex ample, all uart1 signals are multiplexed with port b and have the control register function code of 0b01. there is no port c control register. port c is enable d when the 16-bit-wide external data bus mode is selected at reset by the input leve l on qspi_dout/wsel. the port d contro l register is used to configure pins that have multiple functions (0b01 through 0b11) but no gpio function. caution do not attempt to program a pin f unction that is not defined. where no function is defined, the function code is labeled ?reserved? and is considered invalid. programming any cont rol register field with a reserved value has an unpredictable effect on the corresponding pin?s operation. reserved function codes cannot be reli ably read. attempts to read them yield undetermined values. table 17-2. gpio port register memory map mbar offset [31:24] [23:16] [15:8] [7:0] 0x0080 port a control register (pacnt) 0x0084 port a data direction register (paddr) reserved 0x0086 reserved port a data register (padat) 0x0088 port b control register (pbcnt) 0x008c port b data direction register (pbddr) reserved 0x008e reserved port b data register (pbdat) 0x0094 port c data direction register (pcddr) reserved 0x0096 reserved port c data register (pcdat) 0x0098 port d control register (pdcnt)
general purpose i/o module MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 17-3 17.2.1 port a control register (pacnt) pacnt is used to configure pins that so urce signals multiplexed with gpio port a. table 17-3 describes pacnt fields. table 17-4 provides the same information organized by function. 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 field pacnt15 pacnt14 pacnt13 pacnt 12 pacnt11 pacnt10 pacnt9 pacnt8 reset 0000_0000_0000_0000 r/w read/write 1514131211109876543210 fieldpacnt7pacnt6pacnt5pacnt4pacnt3pacnt2pacnt1pacnt0 reset 0000_0000_0000_0000 r/w read/write addr mbar + 0x0080 figure 17-1. port a control register (pacnt) table 17-3. pacnt field descriptions bits name description 31?30 pacnt15 configure pin m3. if this pin is programmed to function as int6 , it is not available as a gpio. 00 pa15 01 dgnt1 1 x reserved 29?28 pacnt14 configure pin m2 00 pa14 01 dreq1 1 x reserved 27?26 pacnt13 configure pin l3 00 pa13 01 dfsc3 1 x reserved 25?24 pacnt12 configure pin l2 00 pa12 01 dfsc2 1 x reserved 23?22 pacnt11 configure pin l1 00 pa11 01 reserved 10 qspi_cs1 11 reserved 21?20 pacnt10 configure pin k5 00 pa10 01 dreq0 1 x reserved 19?18 pacnt9 configure pin j3 00 pa9 01 dgnt0 1 x reserved
general purpose i/o module MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 17-4 freescale semiconductor int6 is always available on pin m3. it can be enable d by programming the appropriate bits in interrupt control register 4, see section 7.2.2.4, ?interrupt co ntrol register 4 (icr4) , and the programmable interrupt transition register described in section 7.2.4, ?programmable inte rrupt transition register (pitr) . 17?16 pacnt8 configure pin j2 00 pa8 01 fsc0/fsr0 1 x reserved 15?14 pacnt7 configure pin p1 00 pa7 01 qspi_cs3 10 dout3 11 reserved 13?12 pacnt6 configure pin e1 00 pa6 01 usb_rxd 1 x reserved 11?10 pacnt5 configure pin e2 00 pa5 01 usb_txen 1 x reserved 9?8 pacnt4 configure pin e3 00 pa4 01 usb_susp 1 x reserved 7?6 pacnt3 configure pin e4 00 pa3 01 usb_tn 1 x reserved 5?4 pacnt2 configure pin e5 00 pa2 01 usb_rn 1 x reserved 3?2 pacnt1 configure pin d1 00 pa1 01 usb_rp 1 x reserved 1?0 pacnt0 configure pin d2 00 pa0 01 usb_tp 1 x reserved table 17-3. pacnt field descriptions (continued) bits name description (continued)
general purpose i/o module MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 17-5 17.2.2 port b contro l register (pbcnt) pbcnt, shown in figure 17-2 , is used to configure the pins assigne d to signals that are multiplexed with gpio port b. table 17-5 describes pbcnt fields. table 17-6 provides the same information organized by function. table 17-4. port a control register function bits pin number pacnt[ xx ] = 00 (function 0b00) pacnt[ xx ] = 01 (function 0b01) pacnt[ xx ] = 10 (function 0b10) pacnt[ xx ] = 11 (function 0b11) d2 pa0 usb_tp ? ? d1 pa1 usb_rp ? ? e5 pa2 usb_rn ? ? e4 pa3 usb_tn ? ? e3 pa4 usb_susp ? ? e2 pa5 usb_txen ? ? e1 pa6 usb_rxd ? ? p1 pa7 qspi_cs3 dout3 ? j2 pa8 fsc0/fsr0 ? ? j3 pa9 dgnt0 ? ? k5 pa10 dreq0 ? ? l1 pa11 reserved qspi_cs1 ? l2 pa12 dfsc2 ? ? l3 pa13 dfsc3 ? ? m2 pa14 dreq1 ? ? m3 pa15 dgnt1 1 1 if this pin is programmed to function as int6 , it is not available as a gpio. ?? 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 field pbcnt15 pbcnt14 pbcnt13 pbcnt 12 pbcnt11 pbcnt10 pbcnt9 pbcnt8 reset 0000_0000_0000_0000 r/w read/write 1514131211109876543210 field pbcnt7 pbcnt6 pbcnt5 pbcnt 4 pbcnt3 pbcnt2 pbcnt1 pbcnt0 reset 0000_0000_0000_0000 r/w read/write addr mbar + 0x0088 figure 17-2. port b control register (pbcnt)
general purpose i/o module MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 17-6 freescale semiconductor table 17-5. pbcnt field descriptions bits name description 31?30 pbcnt15 configure pin p10 00 pb15 01 e_mdc 1 x reserved 29?28 pbcnt14 configure pin l9 00 pb14 01 e_rxer 1 x reserved 27?26 pbcnt13 configure pin m9 00 pb13 01 e_rxd1 1 x reserved 25?24 pbcnt12 configure pin n9 00 pb12 01 e_rxd2 1 x reserved 23?22 pbcnt11 configure pin p9 00 pb11 01 e_rxd3 10 reserved 11 reserved 21?20 pbcnt10 configure pin l8 00 pb10 01 e_txd1 1 x reserved 19?18 pbcnt9 configure pin m8 00 pb9 01 e_txd2 1 x reserved 17?16 pbcnt8 configure pin n8 00 pb8 01 e_txd3 1 x reserved 15?14 pbcnt7 configure pin m6 00 pb7 01 tout0 1 x reserved 13?12 pbcnt6 configure pin g4 00 pb6 01 reserved 1 x reserved 11?10 pbcnt5 configure pin f3 00 pb5 01 ta 1 x reserved
general purpose i/o module MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 17-7 table 17-6 provides the same information as table 17-6 , but organized by function in stead of register field. 9?8 pbcnt4 configure pin g3 00 pb4 01 urt0_clk 1 x reserved 7?6 pbcnt3 configure pin h3 00 pb3 01 urt0_rts 1 x reserved 5?4 pbcnt2 configure pin h2 00 pb2 01 urt0_cts 1 x reserved 3?2 pbcnt1 configure pin h1. the signal urt0_rxd is always internally connected to tin2. 00 pb1 01 urt0_rxd/tin2 1 x reserved 1?0 pbcnt0 configure pin h4 00 pb0 01 urt0_txd 1 x reserved table 17-6. port b control register function bits pin number pbcntxx = 00 (function 0b00) pbcntxx = 01 (function 0b01) pbcntxx = 10 (function 0b10) pbcntxx = 11 (function 0b11) h4 pb0 urt0_txd ? ? h1 pb1 urt0_rxd/tin2 ? ? h2 pb2 urt0_cts ?? h3 pb3 urt0_rts ?? g3 pb4 urt0_clk ? ? f3 pb5 ta ? ? g4 pb6 ? ? ? m6 pb7 tout0 ? ? n8 pb8 e_txd3 ? ? m8 pb9 e_txd2 ? ? l8 pb10 e_txd1 ? ? p9 pb11 e_rxd3 ? ? n9 pb12 e_rxd2 ? ? m9 pb13 e_rxd1 ? ? l9 pb14 e_rxer ? ? p10 pb15 e_mdc ? ? table 17-5. pbcnt field descriptions (continued) bits name description (continued)
general purpose i/o module MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 17-8 freescale semiconductor 17.2.3 port c control register there is no port c control regi ster. port c is enabled only when the ex ternal data bus is 16 bits wide. this is done by holding qspi_dout/wsel high during reset. when qspi_dou t/wsel is low during reset, the external data bus is 32 bits wide and port c is unavailable. 17.2.4 port d contro l register (pdcnt) pdcnt, shown in table 17-8 , is used to configure pins that have multiple functions but no associated gpio capability. port d has no data re gister nor data direction register. table 17-7 describes pdcnt fields. table 17-8 provides the same inform ation organized by function. 31 16 field ? reset ? r/w ? 1514131211109876543210 field pdcnt7 pdcnt6 pdcnt5 pdcnt4 pdcnt3 pdcnt2 pdcnt1 pdcnt0 reset 0000_0000_0000_0000 r/w read/write addr mbar + 0x0098 figure 17-3. port d control register (pdcnt) table 17-7. pdcnt field descriptions bits name description 31?16 ? reserved 15?14 pdcnt7 configure pin k6. 00 high impedance 01 pwm_out2 10 tin1 11 reserved 13?12 pdcnt6 configure pin p5. 00 high impedance 01 pwm_out1 10 tout1 11 reserved 11?10 pdcnt5 configure pin p2. 00 high impedance 01 reserved 10 din3 11 int4 9?8 pdcnt4 configure pin k1. 00 high impedance 01 dout0 10 urt1_txd 11 reserved
general purpose i/o module MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 17-9 table 17-8 provides the same information as table 17-7 but organized by function in stead of register field. 7?6 pdcnt3 configure pin k3. 00 high impedance 01 reserved 10 urt1_rts 11 int5 5?4 pdcnt2 configure pin k2. 00 high impedance 01 reserved 10 urt1_cts 11 qspi_cs2 3?2 pdcnt1 configure pin k1. the signal urt1_rxd is always internally connected to tin3. 00 high impedance 01 din0 10 urt1_rxd/tin3 11 reserved 1?0 pdcnt0 configure pin j4. 00 high impedance 01 dcl0 10 urt1_clk 11 reserved table 17-8. port d control register function bits pin number pdcntxx = 00 (function 0b00) pdcntxx = 01 (function 0b01) pdcntxx = 10 (function 0b10) pdcntxx = 11 (function 0b11) j4 pin is high z dcl0 urt1_clk ? k1 pin is high z din0 urt1_rxd 1 /tin3 1 urt1_rxd is always internally connected to timer 3 (tin3). ? k2 pin is high z ? urt1_cts qspi_cs2 k3 pin is high z ? urt1_rts int5 k4 pin is high z dout0 urt1_txd ? p2 pin is high z ? din3 int4 p5 pin is high z pwm_out1 tout1 ? k6 pin is high z pwm_out2 tin0 ? 8-15 ? ? ? ? table 17-7. pdcnt field descriptions (continued) bits name description (continued)
general purpose i/o module MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 17-10 freescale semiconductor 17.3 data direction registers these registers are used to program gpio port signals as inputs or outputs. the da ta direction bit for any line is ignored unless that line is configured for general purpose i/o in the appropriate c ontrol register. if a gpio line changes from an input to an output, the init ial data on that pin is the last data written to the latch by the correspondi ng data register. at system reset, these register bi ts are all cleared, config uring all port i/o lines as general purpose inputs. bootstrap software must write an ap propriate value into the data direction register to configure gpio port signals as outputs. when these regi sters are first written, any internal pullups on the corresponding i/o pins are disabled. a detailed description is provided onl y for data direction register a (pad dr). the control bits in all three registers operate in the same manner. 17.3.1 port a data dire ction register (paddr) the paddr determines the signal direction of each parallel port pin programmed as a gpio port in the pacnt. 17.3.2 port b data dire ction register (pbddr) the pbddr determines the signal direction of each pa rallel port pin programmed as a gpio port in the pbcnt. 15 0 field paddr reset 0000_0000_0000_0000 r/w read/write addr mbar + 0x0084 figure 17-4. port a data direction register (paddr) table 17-9. paddr field descriptions bits name description 15?0 paddr data direction bits. each data direction bi t selects the direction of the signal as follows: 0 signal is defined as an input. 1 signal is defined as an output. 15 0 field pbddr reset 0000_0000_0000_0000 r/w read/write addr mbar + 0x008c figure 17-5. port b data direction register (pbddr)
general purpose i/o module MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 17-11 17.3.3 port c data dire ction register (pcddr) the pcddr determines the signal direction of each pa rallel port pin programmed as a gpio port in the pccnt. 17.4 port data registers these 16-bit bidirectional regist ers are used to read or write the logic st ates of the gpio lines. this register has no effect on pins not conf igured for general-purpose i/o. after a system reset, these register bits are all cl eared. when any port lines are configured as outputs, a logic zero appears on thos e pins, unless the data register is written with an initial data value prior to setting the pin direction. the reset values given in the follow ing register diagrams are the port out put values written to the registers during reset, and do not reflect the value of a register read cycle. register reads always return the instantaneous value of the corresponding pins. 17.4.1 port data register (p x dat) in the following description p x dat refers to padat, pbdat, or pcdat. the p x dat value for inputs corresponds to the logic level at the pin; for outputs, the value corresponds to the logic level driven onto the pin. note that p x dat has no effect on pins whic h have not been configured for gpio. 15 0 field pcddr reset 0000_0000_0000_0000 r/w read/write addr mbar + 0x0094 figure 17-6. port c data direction register (pcddr) 15 0 field p x dat reset undefined r/w read/write addr mbar + 0x0086 (padat); 0x008e (pbdat); 0x0096 (pcdat) figure 17-7. port x data register (padat, pbdat, and pcdat)
general purpose i/o module MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 17-12 freescale semiconductor
MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 18-1 chapter 18 pulse-width modulation (pwm) module this chapter describes the configuration and operati on of the pulse-width modul ation (pwm) module. it includes a block diagram, program ming model, and timing diagram. 18.1 overview the pwm module shown in figure 18-1 , generates a synchronous series of pulses having programmable duty cycle. with a suitable low- pass filter, the pwm can be used as a digital-to-analog converter. figure 18-1. pwm block diagram (3 identical modules) pwm_out2 pwm_out1 pwm_out0 sys clock prescaler counter control reg. width reg. width buffer pwcr[cksl] en internal bus comparator generator frc1
pulse-width modulation (pwm) module MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 18-2 freescale semiconductor summary of the main features include: ? double-buffered width register ? variable-divide prescale ? three independent pwm modules ? byte-wide width register provide s programmable duty cycle control 18.2 pwm operation the pwm is a simple free-running count er combined with a pulse-width register and a comparator such that the output is cleared whenever the counter value exceeds the width register value. when the counter overflows, or ?wraps around,? its valu e becomes less than or equal to th e value of the width register, and the output is set. with a suitable low-pass filter, the pwm can be used as a digital-to-analog converter. the width register is double-buffered so that a new value can be loaded fo r the next cycle without affecting the current cycle. at the beginning of each period, the value of the width buf fer register is loaded into the width register, which feeds the comparator. this valu e is used for comparison during the next cycle. the prescaler contains a variable divider that can re duce the incoming clock frequency by certain values between 1 and 32768. 18.3 pwm programming model this section describes the registers and control bi ts in the pwm module. th ere are three independent pwm modules, each with its own cont rol and width registers. the memo ry map for the pwm is shown in table 18-1 . table 18-1. pwm module memory map mbar offset [31:24] [23:16] [15:8] [7:0] 0x00c0 pwm control register 0 (pwcr0) reserved 0x00c4 pwm control register 1 (pwcr1) reserved 0x00c8 pwm control register 2 (pwcr2) reserved 0x00d0 pwm pulse-width register 0 (pwwd0) reserved 0x00d4 pwm pulse-width register 1 (pwwd1) reserved 0x00d8 pwm pulse-width register 2 (pwwd2) reserved
pulse-width modulation (pwm) module MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 18-3 18.3.1 pwm control register (pwcr n ) this register, shown in figure 18-2 , controls the overall operation of the pwm. unless di sabled and then re-enabled, writing to pwcr while the pwm is running will not alter its operati on until the current output cycle finishes. for example, if the prescale value is changed while the pwm is enabled, the new value will not take effect until af ter the counter has ?wrapped around?. th e pwm must be disabled and then re-enabled to affect its operation before the end of the current output cycle. figure 18-2. pwm control registers (pwcr n ) table 18-2 gives pwcr field descriptions. 76543 0 field en frc1 lvl ? cksel reset 0010_0000 r/w read/write address mbar + 0x0c0 (pwcr0); + 0x0c4 (pwcr1); + 0x0c8 (pwcr2) table 18-2. pwcr n field descriptions bits name description 7enenable. 0 disables the pwm. while disabled, the pwm is in low-power mode and the prescaler does not count. when the pwm is disabled, the output is forced to the value of pwcr n [lvl]. 1 enables the pwm. 6 frc1 force output high. 0 default reset value. pwm functions normally. 1 the pwm drives the output high for the entire counter period. pwcr n [frc1] has a lower priority than pwcr n [en], so setting pwcr n [frc1] while pwcr n [en] is cleared has no effect. there are two ways to drive the pwm output high. if pwcr n [en] is cleared, pwm output i mmediately assumes the value of pwcr n [lvl]. if pwcr n [frc1] is set while pwcr n [en] is set, the pwm outp ut does not go high until after the current ou tput cycle completes. 5 lvl disable level. determines the pwm output level whenever the pwm is disabled. 0 the pwm output is low while disabled. 1 the pwm output is high while disabled. 4 ? reserved, should be cleared. 3?0 cksl prescale clock. these bits select the clock frequen cy divider, that is, the output of the divider chain, as shown below. cksl[3:0] divisor 0000 1 0001 2 0010 4 ... ... 111132768
pulse-width modulation (pwm) module MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 18-4 freescale semiconductor 18.3.2 pwm width register (pwwd n ) this register, shown in figure 18-3 , controls the width of the output pulse. when the counter become greater than or equal to the value in this register, th e output is cleared for the re mainder of the period. when the counter overflows, or wraps around, the counter valu e becomes less than or equal to the value of the width register and th e output is set high. writing to the width regist er while the pwm is enabled will not alter the operation of the pwm until the end of the current output cycl e. that is, the width valu e is not modified until af ter the counter has wrapped around. the pwm must be disabled and th en re-enabled to affe ct its operation before the end of the current output cycle. figure 18-3. pwm width register (pwwd n ) figure 18-4 shows example pwm waveforms a nd their dependence on pwwd[pw]. figure 18-4. pwm waveform examples (pwcr n [en] = 1) 7 0 field pw reset 0000_0000 r/w r/w address mbar + 0x0d0 (pwwd0); + 0x0d4 (pwwd1); + 0x0d8 (pwwd2) table 18-3. pwwd n field descriptions bits name description 7?0 pw pulse width. range 0x00?0xff. when the counter value become greater than pwwd[pw], the output is cleared for the remainder of the period. when the coun ter overflows, or wraps around, the counter value becomes less than or equal to pwwd[pw] and the output is set. 256t t 128t 255t t 128t 255t pwwd[pw] = 0x00 pwwd[pw] = 0x01 pwwd[pw] = 0x80 pwwd[pw] = 0xff pwcrn[cksl] = 0000: t = 1 x cpu clock period pwcrn[cksl] = 1111: t = 32768 x cpu clock period pwcrn[frc1] = 1
MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 19-1 chapter 19 signal descriptions this chapter provides a listing and brief descripti on of all the MCF5272 signals . it shows it shows which are inputs or outputs, how they are multiplexed, and the state of each signal at re set. the first listing is organized by function with signals appearing alphabetically within each functional group. this is followed by a second listing sorted by pin num ber. some pins serve as many as four different functions. 19.1 MCF5272 block diagram with signal interfaces figure 19-1 shows the MCF5272 block diagram and how the m odules and signals inte ract. refer also to table 19-1 and table 19-2 for a list of the signals sorted by function and pin number, respectively.
signal descriptions MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 19-2 freescale semiconductor figure 19-1. MCF5272 block diagram with signal interfaces tdo/dso tms/bkpt trst/dsclk tck/pstclk tdi/dsi mtmod ddata[3:0] pst[3:0] e_txd0 e_txen e_txclk e_col e_rxdv e_rxd0 e_rxclk e_txer e_crs pb8/e_txd3 pb9/e_txd2 pb10/e_txd1 pb11/e_rxd3 pb12/e_rxd2 pb13/e_rxd1 pb14/e_rxer pb15/e_mdc e_mdio pa[15:0] pb[15:0] pc[15:0] pb0/urt0_txd pb1/urt0_rxd pb2/urt0_cts pb3/urt0_rts pb4/urt0_clk qspi_dout/wsel qspi_din qspi_clk/busw1 qspi_cs0/busw0 pa11/qspi_cs1 pa7/qspi_cs3/dout3 urt1_cts/qspi_cs2 a[22:0]/sda[13:0] d[31:0]/(d[31:16]/pc15:0) cs[6:0] r/w bs[3:0] oe/rd pb5/ta tea sdcs/cs7 ras0 cas0 sdcke sdclk sdba[1:0] sdwe a10_prechg dout0/urt1_txd din0/urt1_rxd pa10_dreq0 pa9/dgnt0 dcl0/urt1_clk pa 8 / f s c 0 / f s r 0 urt1_rts/int5 urt1_cts/qspi_cs2 dout1 din1 pa14/dreq1 pa15_int6/dgnt1_int6 dcl1/gdcl1_out fsc1/fsr1/dfsc1 pa 1 2 / d f s c 2 pa 1 3 / d f s c 3 pa7/qspi_cs3/dout3 din3/int4 pwm_out0 pwm_out1/tout1 pb7/tout0 jtag and bdm fast ethernet controller gpio uart0 qspi usb tin0 pwm_out2/tin1 usb_clk usb_d? usb_d+ pa6/usb_rxd pa5/usb_txen pa4/usb_susp pa2/usb_rn pa1/usb_rp pa3/usb_tn pa0/usb_tp usb_wor/int1 timer/pit watchdog pwm plic ports 1, 2, and 3 plic port 0 uart1 external bus interface ext interrupts int[6:1] clkin bypass hiz rsto rsti dreseten rom 16 kbytes ram 4 kbytes instruction cache ram 1 kbyte v2 coldfire cpu and mac/div k to m m bus switch/ arb kbus mbus sbus 10 base-t 7 wire 10/100 base-t mii interface external cpu and sdram bus dedicatated sdram control note: gpio pins shown above are mu ltiplexed with most other signals.
signal descriptions MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 19-3 19.2 signal list table 19-1 summarizes the signals, showing default pin f unctions after system re set. general-purpose port signals all default to inputs after reset. table 19-2 presents the same inform ation sorted by pin number instead of signal function. note: in this manual, the term ?asserted? i ndicates the active signal state; ?negated? indicates inactive. names of active- low signals are given overbars, for example, int1 and sdwe . table 19-1. signal descriptions sorted by function (sheet 1 of 8) configured by (see notes) 1 pin functions description map bga pin i/o drive (ma) cpf 0 (reset) 1 2 3 a0 ? ? ? a0 d10 o 6 30 a1 sda0 ? ? a1/sdram-16bit a0 b12 o 6 30 a10 sda9 sda8 ? a10/sdram-16bit a9/sdram-32bit a8 d12 o 6 30 a10_prechg ? ? ? sdram a10_precharge d14 o 10 30 a11 ? sda9 ? a11/sdram-32bit a9 c11 o 6 30 a12 sda11 ? ? a12/sdram-16bit a11 b11 o 6 30 a13 sda12 sda11 ? a13/sdram-16bit a12/sdram-32bit a11 a11 o 6 30 a14 sda13 sda12 ? a14/sdram-16bit a13/sdram-32bit a12 c10 o 6 30 a15 ? ? ? a15 d9 o 6 30 a16 ? ? ? a16 d8 o 6 30 a17 ? ? ? a17 d7 o 6 30 a18 ? ? ? a18 c6 o 6 30 a19 ? ? ? a19 d6 o 6 30 a2 sda1 sda0 ? a2/sdram-16bit a1/sdram-32bit a0 a12 o 6 30 a20 ? ? ? a20 b5 o 6 30 a21 ? ? ? a21 c5 o 6 30 a22 ? ? ? a22 e9 o 6 30 a3 sda2 sda1 ? a3/sdram-16bit a2/sdram-32bit a1 a13 o 6 30 a4 sda3 sda2 ? a4/sdram-16bit a3/sdram-32bit a2 a14 o 6 30 a5 sda4 sda3 ? a5/sdram-16bit a4/sdram-32bit a3 b13 o 6 30
signal descriptions MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 19-4 freescale semiconductor a6 sda5 sda4 ? a6/sdram-16bit a5/sdram-32bit a4 b14 o 6 30 a7 sda6 sda5 ? a7/sdram-16bit a6/sdram-32bit a5 c12 o 6 30 a8 sda7 sda6 ? a8/sdram-16bit a7/sdram-32bit a6 c13 o 6 30 a9 sda8 sda7 ? a9/sdram-16bit a8/sdram-32bit a7 c14 o 6 30 bs0 ? ? ? byte strobe 0 a9 o 6 30 bs1 ? ? ? byte strobe 1 c8 o 6 30 bs2 ? ? ? byte strobe 2 e12 o 6 30 bs3 ? ? ? byte strobe 3 e13 o 6 30 cas0 ? ? ? sdram column select strobe c9 o 10 30 clkin ? ? ? cpu external clock input m14 i busw[1:0] 2 cs0 /boot ? ? ? chip select 0 k9 o 6 30 cs1 ? ? ? chip select 1 k10 o 6 30 cs2 ? ? ? chip select 2 p11 o 6 30 cs3 ? ? ? chip select 3 n11 o 6 30 cs4 ? ? ? chip select 4 m11 o 6 30 cs5 ? ? ? chip select 5 l11 o 6 30 cs6 ? ? ? chip select 6 p12 o 6 30 wsel pin 2 d0 pc0 ? ? d0/port c bit 0 l12 i/o 6 30 wsel pin 2 d1 pc1 ? ? d1/port c bit 1 l13 i/o 6 30 wsel pin 2 d10 pc10 ? ? d10/port c bit 10 h11 i/o 6 30 wsel pin 2 d11 pc11 ? ? d11/port c bit 11 g11 i/o 6 30 wsel pin 2 d12 pc12 ? ? d12/port c bit 12 f11 i/o 6 30 wsel pin 2 d13 pc13 ? ? d13/port c bit 13 e11 i/o 6 30 wsel pin 2 d14 pc14 ? ? d14/port c bit 14 d11 i/o 6 30 wsel pin 2 d15 pc15 ? ? d15/port c bit 15 e10 i/o 6 30 wsel pin 2 d16 d0 ? ? d16/d0 a5 i/o 6 30 wsel pin 2 d17 d1 ? ? d17/d1 b6 i/o 6 30 wsel pin 2 d18 d2 ? ? d18/d2 a6 i/o 6 30 wsel pin 2 d19 d3 ? ? d19/d3 c7 i/o 6 30 wsel pin 2 d2 pc2 ? ? d2/port c bit 2 l14 i/o 6 30 table 19-1. signal descriptions sorted by function (sheet 2 of 8) configured by (see notes) 1 pin functions description map bga pin i/o drive (ma) cpf 0 (reset) 1 2 3
signal descriptions MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 19-5 wsel pin 2 d20 d4 ? ? d20/d4 b7 i/o 6 30 wsel pin 2 d21 d5 ? ? d21/d5 a7 i/o 6 30 wsel pin 2 d22 d6 ? ? d22/d6 a8 i/o 6 30 wsel pin 2 d23 d7 ? ? d23/d7 b8 i/o 6 30 wsel pin 2 d24 d8 ? ? d24/d8 f12 i/o 6 30 wsel pin 2 d25 d9 ? ? d25/d9 f13 i/o 6 30 wsel pin 2 d26 d10 ? ? d26/d10 f14 i/o 6 30 wsel pin 2 d27 d11 ? ? d27/d11 g12 i/o 6 30 wsel pin 2 d28 d12 ? ? d28/d12 g13 i/o 6 30 wsel pin 2 d29 d13 ? ? d29/d13 g14 i/o 6 30 wsel pin 2 d3 pc3 ? ? d3/port c bit 3 k11 i/o 6 30 wsel pin 2 d30 d14 ? ? d30/d14 h14 i/o 6 30 wsel pin 2 d31 d15 ? ? d31/d15 h13 i/o 6 30 wsel pin 2 d4 pc4 ? ? d4/port c bit 4 k12 i/o 6 30 wsel pin 2 d5 pc5 ? ? d5/port c bit 5 k13 i/o 6 30 wsel pin 2 d6 pc6 ? ? d6/port c bit 6 k14 i/o 6 30 wsel pin 2 d7 pc7 ? ? d7/port c bit 7 j11 i/o 6 30 wsel pin 2 d8 pc8 ? ? d8/port c bit 8 j12 i/o 6 30 wsel pin 2 d9 pc9 ? ? d9/port c bit 9 j13 i/o 6 30 hiz ? ? ? high impedance enable n14 i 30 dcl1/ gdcl1_out ? ? ? plic ports 1, 2, 3 data clock/generated dcl out m1 i/o 4 30 ddata0 ? ? ? debug data 0 c3 o 4 30 ddata1 ? ? ? debug data 1 a2 o 4 30 ddata2 ? ? ? debug data 2 b2 o 4 30 ddata3 ? ? ? debug data 3 a1 o 4 30 din1 ? ? ? plic ports 1, 2, 3 data input n2 i dout1 ? ? ? plic ports 1, 2, 3 data output n1 o 2 30 dreseten ? ? ? dram controller reset enable n12 i e_col ? ? ? collision p6 i e_crs ? ? ? carrier sense (100 base-t ethernet only) l10 i table 19-1. signal descriptions sorted by function (sheet 3 of 8) configured by (see notes) 1 pin functions description map bga pin i/o drive (ma) cpf 0 (reset) 1 2 3
signal descriptions MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 19-6 freescale semiconductor e_mdio ? ? ? management channel serial data (100 base-t only) n10 i/o 2 e_rxclk ? ? ? ethernet rx clock n7 i e_rxd0 ? ? ? ethernet rx data p7 i e_rxdv ? ? ? ethernet rx data valid m7 i e_tx clk ? ? ? ethernet tx clock l7 i e_txd0 ? ? ? ethernet tx data n6 o 4 30 e_txen ? ? ? ethernet tx enable p8 o 2 30 e_txer ? ? ? transmit error (100 base-t ethernet only) m10 o 2 30 fsc1/fsr1/ dfsc1 ? ? ? plic port 1 idl fsr/gci fsc1/generated frame sync 1 out l4 i/o 2 30 gnd ground ? ? e[7,8] f[7,8] g[6?9] h[6?9] j[7,8] port d cntl reg 3 high z dcl0 urt1_clk ? port 0 data clock/uart1 baud clock j4 i port d cntl reg 3 high z din0 urt1_rxd ? idl/gci data in/uart1 rx data k1 i port d cntl reg 3 high z ? urt1_ cts qspi_ cs2 uart1 cts/qspi_cs2 k2 i/o 2 30 port d cntl reg 3 high z ? urt1_rts int5 uart1 rts/int5 k3 i/o 2 30 port d cntl reg 3 high z dout0 urt1_txd ? idl-gci data out/uart1 tx data k4 o 2 30 port d cntl reg 3 high z ? din3 int4 interrupt 4 input/plic port 3 data input p2 i port d cntl reg 3 high z pwm_ out1 tout1 ? pwm output compare 1 /timer 1 output compare p5 o 4 30 port d cntl reg 3 high z pwm_ out2 tin1 ? pwm output compare 2 /timer 1 input k6 i/o 4 30 int1 / usb_wor ? ? ? interrupt input 1/usb wake-on-ring m4 i int2 ? ? ? interrupt input 1 p3 i int3 ? ? ? interrupt input 3 n3 i table 19-1. signal descriptions sorted by function (sheet 4 of 8) configured by (see notes) 1 pin functions description map bga pin i/o drive (ma) cpf 0 (reset) 1 2 3
signal descriptions MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 19-7 mtmod ? ? ? 0 selects jtag mode, 1 selects bdm mode b3 i oe /rd ? ? ? output enable/read p13 o 4 30 port a cntl reg 3 pa0 usb_tp ? ? port a bit 0/ usb tx positive d2 i/o 2 30 port a cntl reg 3 pa1 usb_rp ? ? port a bit 1/ usb rx positive d1 i/o 2 30 port a cntl reg 3 pa10 dreq0 ? ? port a bit 10/idl dreq0 k5 i/o 2 30 port a cntl reg 3 pa11 ? qspi_cs1 ? port a bit 11/qspi chip select 1 l1 i/o 2 30 port a cntl reg 3 pa12 dfsc2 ? ? port a bit 12/delayed frame sync 2 l2 i/o 2 30 port a cntl reg 3 pa13 dfsc3 ? ? port a bit 13/delayed frame sync 3 l3 i/o 2 30 port a cntl reg 3 pa14 dreq1 ? ? port a bit 14/plic port 1 idl d-channel request m2 i/o 4 30 port a cntl reg 3 pa15_int6 dgnt1_int6 ? ? port a bit 15/plic port 1 d-channel grant/interrupt 6 input m3 i/o 2 30 port a cntl reg 3 pa2 usb_rn ? ? port a bit 2/ usb rx negative e5 i/o 2 30 port a cntl reg 3 pa3 usb_tn ? ? port a bit 3/ usb tx negative e4 i/o 2 30 port a cntl reg 3 pa4 usb_ susp ? ? port a bit 4/ suspend usb driver e3 i/o 2 30 port a cntl reg 3 pa5 usb_txen ? ? port a bit 5/usb transmitter enable e2 i/o 2 30 port a cntl reg 3 pa6 usb_rxd ? ? port a bit 6/usb receive data output e1 i/o 2 30 port a cntl reg 3 pa7 qspi_cs3 dout3 ? pa7/ qspi chip select 4/plic port 3 data output p1 i/o 2 30 port a cntl reg 3 pa 8 f s c 0 / fsr0 ? ? port a bit 8/idl fsr0 & gci fsc0 j2 i/o 2 30 port a cntl reg 3 pa9 dgnt0 ? ? port a bit 9//idl dgnt0 j3 i/o 2 30 port b cntl reg 3 pb0 urt0_txd ? ? port b bit 0/uart0 tx data h4 i/o 4 30 port b cntl reg 3 pb1 urt0_rxd ? ? port b bit 1/uart0 rx data h1 i/o 2 30 table 19-1. signal descriptions sorted by function (sheet 5 of 8) configured by (see notes) 1 pin functions description map bga pin i/o drive (ma) cpf 0 (reset) 1 2 3
signal descriptions MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 19-8 freescale semiconductor port b cntl reg 3 pb10 e_txd1 ? ? port b bit 10/tx data bit 1 (100 base-t ethernet only) l8 i/o 4 30 port b cntl reg 3 pb11 e_rxd3 ? ? port b bit 11/rx data bit 3 (100 base-t ethernet only) p9 i/o 2 30 port b cntl reg 3 pb12 e_rxd2 ? ? port b bit 12/rx data bit 2 (100 base-t ethernet only) n9 i/o 2 30 port b cntl reg 3 pb13 e_rxd1 ? ? port b bit 13/rx data bit 1 (100 base-t ethernet only) m9 i/o 2 30 port b cntl reg 3 pb14 e_rxer ? ? port b bit 14/receive error (100 base-t ethernet only) l9 i/o 2 30 port b cntl reg 3 pb15 e_mdc ? ? port b bit 15/ management channel clock (100 base-t only) p10 i/o 2 30 port b cntl reg 3 pb2 urt0_ cts ? ? port b bit 2/uart0 cts h2 i/o 2 30 port b cntl reg 3 pb3 urt0_ rts ? ? port b bit 3/uart0 rts h3 i/o 4 30 port b cntl reg 3 pb4 urt0_clk ? ? port b bit 4/uart0 baud clock g3 i/o 2 30 port b cntl reg 3 pb5 ta ? ? port b bit 5/transfer acknowledge f3 i/o 2 port b cntl reg 3 pb6 ? ? ? port b bit 6 g4 i/o 2 30 port b cntl reg 3 pb7 tout0 ? ? port b bit 7/timer 0 output compare m6 i/o 4 30 port b cntl reg 3 pb8 e_txd3 ? ? port b bit 8/tx data bit 3 (100 base-t ethernet only) n8 i/o 4 30 port b cntl reg 3 pb9 e_txd2 ? ? port b bit 9/tx data bit 2 (100 base-t ethernet only) m8 i/o 4 30 pst0 ? ? ? internal processor status 0 b1 o 4 30 pst1 ? ? ? internal processor status 1 c2 o 4 30 pst2 ? ? ? internal processor status 2 c1 o 4 30 table 19-1. signal descriptions sorted by function (sheet 6 of 8) configured by (see notes) 1 pin functions description map bga pin i/o drive (ma) cpf 0 (reset) 1 2 3
signal descriptions MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 19-9 pst3 ? ? ? internal processor status 3 d3 o 4 30 pwm_out0 ? ? ? pwm output compare 0 n5 o 4 30 qspi_clk/ busw1 ? ? ? qspi serial clock/cs0 bus width bit 1 l5 o 4 30 qspi_cs0/ busw0 ? ? ? qspi peripheral chip select 0/cs0 bus width bit 0 m5 o 2 30 qspi_din ? ? ? qspi data input p4 i qspi_dout/ wsel ? ? ? qspi data output/bus width selection n4 i/o 4 30 r/w ? ? ? read/write p14 o 10 30 ras0 ? ? ? sdram row select strobe a10 o 10 30 rsti ? ? ? device reset m12 i rsto ? ? ? reset output strobe f4 o 4 30 sdba0 ? ? ? sdram bank 0 select j14 o 10 30 sdba1 ? ? ? sdram bank 1 select h12 o 10 30 sdclk ? ? ? sdram (bus) clock, same frequency as cpu clock e14 o 10 30 sdclke ? ? ? sdram clock enable d13 o 10 30 sdcs / cs7 ? ? ? sdram chip select/cs7 b10 o 10 30 sdwe ? ? ? sdram write enable b9 o 10 30 bypass ? ? ? bypass internal test mode m13 o 4 30 mtmod 4 tck pstclk ? ? jtag test clock in/ bdm pstclk output c4 i/o 4 30 mtmod 4 tdi dsi ? ? jtag test data in/bdm data in a4 i mtmod 4 tdo dso ? ? jtag test data out /bdm data out d5 o 4 30 tea ? ? ? bdm debug transfer error acknowledge a3 i test ? ? ? device test mode enable e6 i tin0 ? ? ? timer 0 input l6 i mtmod 4 tms bkpt ? ? jtag test mode/bdm select breakpoint input b4 i table 19-1. signal descriptions sorted by function (sheet 7 of 8) configured by (see notes) 1 pin functions description map bga pin i/o drive (ma) cpf 0 (reset) 1 2 3
signal descriptions MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 19-10 freescale semiconductor mtmod 4 trst dsclk ? ? jtag reset/bdm clock d4 i usb_clk ? ? ? usb external 48-mhz clock input j1 i usb_d+ ? ? ? usb line driver high, analog 5 f1 o ? 30 usb_d? ? ? ? usb line driver low, analog 5 f2 o ? 30 usb_gnd ? ? ? usb transceiver gnd g2 i usb_vdd ? ? ? usb transceiver vdd g1 i vdd +3.3v ? ? f[5,6] f[9,10] g[5,10] h[5,10] j[5,6] j[9,10] k[7,8] n13 1 no entry in this column means that after reset the pin is not reconfigurable and has only one definition. 2 wsel, busw1, busw0, hiz, and others, refers to function determined by pull-up or pull-down value as seen by these address pins during reset. 3 ?port x cntl reg? refers to pin function programmed by software writing to gpio port configuration registers. 4 mtmod means that pin function is dete rmined by state of the mtmod signal. 5 requires external protection circuitry to meet usb 1. 1 electrical requirements under all conditions (see 12.5.3, ?recommended usb protection circuit ?). table 19-1. signal descriptions sorted by function (sheet 8 of 8) configured by (see notes) 1 pin functions description map bga pin i/o drive (ma) cpf 0 (reset) 1 2 3
signal descriptions MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 19-11 table 19-2 presents signal names, functions, a nd descriptions sorted by pin numbers. table 19-2. signal name and description by pin number (sheet 1 of 8) map bga pin pin functions name description i/o 0 (reset) 1 2 3 a1 ddata3 ? ? ? ddata3 debug data 3 o a2 ddata1 ? ? ? ddata1 debug data 1 o a3 tea ? ? ? tea bdm debug transfer error acknowledge i a4 tdi dsi ? ? tdi/dsi jtag test data in/bdm data in i a5 d16 d0 ? ? d16/d0 d16/d0 i/o a6 d18 d2 ? ? d18/d2 d18/d2 i/o a7 d21 d5 ? ? d21/d5 d21/d5 i/o a8 d22 d6 ? ? d22/d6 d22/d6 i/o a9 bs0 ? ? ? bs0 byte strobe 0 o a10 ras0 ? ? ? ras0 sdram row select strobe o a11 a13 sda12 sda11 ? a13/sda12/sda11 a13/sdram-16bit a12/sdram-32bit a11 o a12 a2 sda1 sda0 ? a2/sda1/sda0 a2/sdram-16bit a1/sdram-32bit a0 o a13 a3 sda2 sda1 ? a3/sda2/sda1 a3/sdram-16bit a2/sdram-32bit a1 o a14 a4 sda3 sda2 ? a4/sda3/sda2 a4/sdram-16bit a3/sdram-32bit a2 o b1 pst0 ? ? ? pst0 internal processor status 0 o b2 ddata2 ? ? ? ddata2 debug data 2 o b3 mtmod ? ? ? mtmod 0 selects jtag mode, 1 selects bdm mode i b4 tms bkpt ? ? tms/bkpt jtag test mode/bdm select breakpoint input i b5 a20 ? ? ? a20 a20 o b6 d17 d1 ? ? d17/d1 d17/d1 i/o b7 d20 d4 ? ? d20/d4 d20/d4 i/o b8 d23 d7 ? ? d23/d7 d23/d7 i/o b9 sdwe ? ? ? sdwe sdram write enable o b10 sdcs / cs7 ? ? ? sdcs / cs7 sdram chip select/cs7 o b11 a12 sda11 ? ? a12/sda11 a12/sdram-16bit a11 o
signal descriptions MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 19-12 freescale semiconductor b12 a1 sda0 ? ? a1/sda0 a1/sdram-16bit a0 o b13 a5 sda4 sda3 ? a5/sda4/sda3 a5/sdram-16bit a4/sdram-32bit a3 o b14 a6 sda5 sda4 ? a6/sda5/sda4 a6/sdram-16bit a5/sdram-32bit a4 o c1 pst2 ? ? ? pst2 internal processor status 2 o c2 pst1 ? ? ? pst1 internal processor status 1 o c3 ddata0 ? ? ? ddata0 debug data 0 o c4 tck pstclk ? ? tck/pstclk jtag test clock in/ bdm pstclk output i/o c5 a21 ? ? ? a21 a21 o c6 a18 ? ? ? a18 a18 o c7 d19 d3 ? ? d19/d3 d19/d3 i/o c8 bs1 ? ? ? bs1 byte strobe 1 o c9 cas0 ? ? ? cas0 sdram column select strobe o c10 a14 sda13 sda12 ? a14/sda13/sda12 a14/sdram-16bit a13/sdram-32bit a12 o c11 a11 ? sda9 ? a11/sda9 a11/sdram-32bit a9 o c12 a7 sda6 sda5 ? a7/sda6/sda5 a7/sdram-16bit a6/sdram-32bit a5 o c13 a8 sda7 sda6 ? a8/sda7/sda6 a8/sdram-16bit a7/sdram-32bit a6 o c14 a9 sda8 sda7 ? a9/sda8/sda7 a9/sdram-16bit a8/sdram-32bit a7 o d1 pa1 usb_rp ? ? pa1/usb_rp port a bit 1/ usb rx positive i/o d2 pa0 usb_tp ? ? pa0/usb_tp port a bit 0/ usb tx positive i/o d3 pst3 ? ? ? pst3 internal processor status 3 o d4 trst dsclk ? ? trst /dsclk jtag reset/bdm clock i d5 tdo dso ? ? tdo/dso jtag test data out /bdm data out o d6 a19 ? ? ? a19 a19 o d7 a17 ? ? ? a17 a17 o table 19-2. signal name and description by pin number (sheet 2 of 8) map bga pin pin functions name description i/o 0 (reset) 1 2 3
signal descriptions MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 19-13 d8 a16 ? ? ? a16 a16 o d9 a15 ? ? ? a15 a15 o d10 a0 ? ? ? a0 a0 o d11 d14 pc14 ? ? d14/pc14 d14/port c bit 14 i/o d12 a10 sda9 sda8 ? a10/sda9/sda8 a10/sdram-16bit a9/sdram-32bit a8 o d13 sdclke ? ? ? sdclke sdram clock enable o d14 a10_prechg ? ? ? a10_prechg sdram a10_precharge o e1 pa6 usb_rxd ? ? pa6/usb_rxd port a bit 6/usb receive data output i/o e2 pa5 usb_txen ? ? pa5/usb_txen port a bit 5/usb transmitter enable i/o e3 pa4 usb_ susp ? ? pa4/usb_susp port a bit 4/ suspend usb driver i/o e4 pa3 usb_tn ? ? pa3/usb_tn port a bit 3/ usb tx negative i/o e5 pa2 usb_rn ? ? pa2/usb_rn port a bit 2/ usb rx negative i/o e6 test ? ? ? test device test mode enable i e7 gnd ground ? ? gnd e8 gnd ground ? ? gnd e9 a22 ? ? ? a22 a22 o e10 d15 pc15 ? ? d15/pc15 d15/port c bit 15 i/o e11 d13 pc13 ? ? d13/pc13 d13/port c bit 13 i/o e12 bs2 ? ? ? bs2 byte strobe 2 o e13 bs3 ? ? ? bs3 byte strobe 3 o e14 sdclk ? ? ? sdclk sdram (bus) clock, same frequency as cpu clock o f1 usb_d+ ? ? ? usb_d+ usb line driver high, analog o f2 usb_d- ? ? ? usb_d- usb line driver low, analog o f3 pb5 ta ? ? pb5/ta port b bit 5/transfer acknowledge i/o f4 rsto ? ? ? rsto reset output strobe o f5 vdd +3.3v ? ? vdd table 19-2. signal name and description by pin number (sheet 3 of 8) map bga pin pin functions name description i/o 0 (reset) 1 2 3
signal descriptions MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 19-14 freescale semiconductor f6 vdd +3.3v ? ? vdd f7 gnd ground ? ? gnd f8 gnd ground ? ? gnd f9 vdd +3.3v ? ? vdd f10] vdd +3.3v ? ? vdd f11 d12 pc12 ? ? d12/pc12 d12/port c bit 12 i/o f12 d24 d8 ? ? d24/d8 d24/d8 i/o f13 d25 d9 ? ? d25/d9 d25/d9 i/o f14 d26 d10 ? ? d26/d10 d26/d10 i/o g1 usb_vdd ? ? ? usb_vdd usb transceiver vdd i g2 usb_gnd ? ? ? usb_gnd usb transceiver gnd i g3 pb4 urt0_clk ? ? pb4/urt0_clk port b bit 4/uart0 baud clock i/o g4 pb6 ? ? ? pb6 port b bit 6 i/o g5 vdd +3.3v ? ? vdd g6 gnd ground ? ? gnd g7 gnd ground ? ? gnd g8 gnd ground ? ? gnd g9 gnd ground ? ? gnd g10 vdd +3.3v ? ? vdd g11 d11 pc11 ? ? d11/pc11 d11/port c bit 11 i/o g12 d27 d11 ? ? d27/d11 d27/d11 i/o g13 d28 d12 ? ? d28/d12 d28/d12 i/o g14 d29 d13 ? ? d29/d13 d29/d13 i/o h1 pb1 urt0_rxd ? ? pb1/urt0_rxd port b bit 1/uart0 rx data i/o h2 pb2 urt0_ cts ? ? pb2/urt0_cts port b bit 2/uart0 cts i/o h3 pb3 urt0_ rts ? ? pb3/urt0_rts port b bit 3/uart0 rts i/o h4 pb0 urt0_txd ? ? pb0/urt0_txd port b bit 0/uart0 tx data i/o h5 vdd +3.3v ? ? vdd h6 gnd ground ? ? gnd h7 gnd ground ? ? gnd table 19-2. signal name and description by pin number (sheet 4 of 8) map bga pin pin functions name description i/o 0 (reset) 1 2 3
signal descriptions MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 19-15 h8 gnd ground ? ? gnd h9 gnd ground ? ? gnd h10 vdd +3.3v ? ? vdd h11 d10 pc10 ? ? d10/pc10 d10/port c bit 10 i/o h12 sdba1 ? ? ? sdba1 sdram bank 1 select o h13 d31 d15 ? ? d31/d15 d31/d15 i/o h14 d30 d14 ? ? d30/d14 d30/d14 i/o j1 usb_clk ? ? ? usb_clk usb external 48-mhz clock input i j2 pa8 fsc0/ fsr0 ? ? pa8/fsc0/fsr0 port a bit 8/idl fsr0 & gci fsc0 i/o j3 pa9 dgnt0 ? ? pa9/dgnt0 port a bit 9//idl dgnt0 i/o j4 high z dcl0 urt1_clk ? dcl0/urt1_clk port 0 data clock/uart1 baud clock i j5 vdd +3.3v ? ? vdd j6 vdd +3.3v ? ? vdd j7 gnd ground ? ? gnd j8 gnd ground ? ? gnd j9 vdd +3.3v ? ? vdd j10 vdd +3.3v ? ? vdd j11 d7 pc7 ? ? d7/pc7 d7/port c bit 7 i/o j12 d8 pc8 ? ? d8/pc8 d8/port c bit 8 i/o j13 d9 pc9 ? ? d9/pc9 d9/port c bit 9 i/o j14 sdba0 ? ? ? sdba0 sdram bank 0 select o k1 high z din0 urt1_rxd ? din0/urt1_rxd idl/gci data in/uart1 rx data i k2 high z ? urt1_ cts qspi_ cs2 urt1_cts /qspi_cs2 uart1 cts/qspi_cs2 i/o k3 high z ? urt1_rts int5 urt1_rts /int5 uart1 rts/int5 i/o k4 high z dout0 urt1_txd ? dout0/urt1_txd idl-gci data out/uart1 tx data o k5 pa10 dreq0 ? ? pa10/dreq0 port a bit 10/idl dreq0 i/o k6 high z pwm_ out2 tin1 ? pwm_out2/tin1 pw m output compare 2 /timer 1 input i/o k7 vdd +3.3v ? ? vdd k8 vdd +3.3v ? ? vdd table 19-2. signal name and description by pin number (sheet 5 of 8) map bga pin pin functions name description i/o 0 (reset) 1 2 3
signal descriptions MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 19-16 freescale semiconductor k9 cs0 /boot ? ? ? cs0 /boot chip select 0 o k10 cs1 ? ? ? cs1 chip select 1 o k11 d3 pc3 ? ? d3/pc3 d3/port c bit 3 i/o k12 d4 pc4 ? ? d4/pc4 d4/port c bit 4 i/o k13 d5 pc5 ? ? d5/pc5 d5/port c bit 5 i/o k14 d6 pc6 ? ? d6/pc6 d6/port c bit 6 i/o l1 pa11 ? qspi_cs1 ? pa11/qspi_cs1 port a bit 11/qspi chip select 1 i/o l2 pa12 dfsc2 ? ? pa12/dfsc2 port a bit 12/delayed frame sync 2 i/o l3 pa13 dfsc3 ? ? pa13/dfsc3 port a bit 13/delayed frame sync 3 i/o l4 fsc1/fsr1/ dfsc1 ? ? ? fsc1/fsr1/dfsc1 plic port 1 idl fsr/gci fsc1/generated frame sync 1 out i/o l5 qspi_clk/ busw1 ? ? ? qspi_clk / busw1 qspi serial clock/cs0 bus width bit 1 o l6 tin0 ? ? ? tin0 timer 0 input i l7 e_tx clk ? ? ? e_tx clk ethernet tx clock i l8 pb10 e_txd1 ? ? pb10/e_txd1 port b bit 10/tx data bit 1 (100 base-t ethernet only) i/o l9 pb14 e_rxer ? ? pb14/e_rxer port b bit 14/receive error (100 base-t ethernet only) i/o l10 e_crs ? ? ? e_crs carrier sense (100 base-t ethernet only) i l11 cs5 ? ? ? cs5 chip select 5 o l12 d0 pc0 ? ? d0/pc0 d0/port c bit 0 i/o l13 d1 pc1 ? ? d1/pc1 d1/port c bit 1 i/o l14 d2 pc2 ? ? d2/pc2 d2/port c bit 2 i/o m1 dcl1/ gdcl1_out ? ? ? dcl1/gdcl1_out plic ports 1, 2, 3 data clock/generated dcl out i/o m2 pa14 dreq1 ? ? pa14/dreq1 port a bit 14/plic port 1 idl d-channel request i/o m3 pa15_int6 dgnt1_int6 ? ? pa15_int6 /dgnt1_int6 port a bit 15/plic port 1 d-channel grant/interrupt 6 input i/o table 19-2. signal name and description by pin number (sheet 6 of 8) map bga pin pin functions name description i/o 0 (reset) 1 2 3
signal descriptions MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 19-17 m4 int1 / usb_wor ???int1 / usb_wor interrupt input 1/usb wake-on-ring i m5 qspi_cs0/ busw0 ? ? ? qspi_cs0 / busw0 qspi peripheral chip select 0/cs0 bus width bit 0 o m6 pb7 tout0 ? ? pb7/tout0 port b bit 7/timer 0 output compare i/o m7 e_rxdv ? ? ? e_rxdv ethernet rx data valid i m8 pb9 e_txd2 ? ? pb9/e_txd2 port b bit 9/tx data bit 2 (100 base-t ethernet only) i/o m9 pb13 e_rxd1 ? ? pb13/e_rxd1 port b bit 13/rx data bit 1 (100 base-t ethernet only) i/o m10 e_txer ? ? ? e_txer transmit error (100 base-t ethernet only) o m11 cs4 ? ? ? cs4 chip select 4 o m12 rsti ? ? ? rsti device reset i m13 bypass ? ? ? bypass bypass internal test mode o m14 clkin ? ? ? clkin cpu external clock input i n1 dout1 ? ? ? dout1 plic ports 1, 2, 3 data output o n2 din1 ? ? ? din1 plic ports 1, 2, 3 data input i n3 int3 ? ? ? int3 interrupt input 3 i n4 qspi_dout/ wsel ? ? ? qspi_dout / wsel qspi data output/bus width selection i/o n5 pwm_out0 ? ? ? pwm_out0 pwm output compare 0 o n6 e_txd0 ? ? ? e_txd0 ethernet tx data o n7 e_rxclk ? ? ? e_rxclk ethernet rx clock i n8 pb8 e_txd3 ? ? pb8/e_txd3 port b bit 8/tx data bit 3 (100 base-t ethernet only) i/o n9 pb12 e_rxd2 ? ? pb12/e_rxd2 port b bit 12/rx data bit 2 (100 base-t ethernet only) i/o n10 e_mdio ? ? ? e_mdio management channel serial data (100 base-t only) i/o table 19-2. signal name and description by pin number (sheet 7 of 8) map bga pin pin functions name description i/o 0 (reset) 1 2 3
signal descriptions MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 19-18 freescale semiconductor n11 cs3 ? ? ? cs3 chip select 3 o n12 dreseten ? ? ? dreseten dram controller reset enable i n13 vdd +3.3v ? ? n14 hiz ? ? ? hiz high impedance enable i p1 pa7 qspi_cs3 dout3 ? pa7/qspi_cs3 /dout3 pa7/qspi chip select 4/plic port 3 data output i/o p2 high z ? din3 int4 din3/int4 interrupt 4 input/plic port 3 data input i p3 int2 ? ? ? int2 interrupt input 1 i p4 qspi_din ? ? ? qspi_din qspi data input i p5 high z pwm_ out1 tout1 ? pwm_out1/tout1 pwm output compare 1 /timer 1 output compare o p6 e_col ? ? ? e_col collision i p7 e_rxd0 ? ? ? e_rxd0 ethernet rx data i p8 e_txen ? ? ? e_txen ethernet tx enable o p9 pb11 e_rxd3 ? ? pb11/e_rxd3 port b bit 11/rx data bit 3 (100 base-t ethernet only) i/o p10 pb15 e_mdc ? ? pb15/e_mdc port b bit 15/ management channel clock (100 base-t only) i/o p11 cs2 ? ? ? cs2 chip select 2 o p12 cs6 ? ? ? cs6 /aen chip select 6 o p13 oe /rd ? ? ? oe /rd output enable/read o p14 r/w ??? r/w read/write o table 19-2. signal name and description by pin number (sheet 8 of 8) map bga pin pin functions name description i/o 0 (reset) 1 2 3
signal descriptions MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 19-19 19.3 address bus (a[22:0]/sda[13:0]) the 23 dedicated address signals, a[ 22:0], define the address of ex ternal byte, word, and longword accesses. these three-state outputs are the 23 lsbs of the internal 32-bit addre ss bus and are multiplexed with the sdram controller row a nd column addresses (sda[13:0]). fourteen address signals are used for connect ing to sdram devices as large as 256 mbits. the MCF5272 supports sdram widths of 16 or 32 bits. for a 32-bit wi dth, sdram address signals are multiplexed starting with a2. for a 16-bit width, address signals are multiplexed starting with a1. 19.4 data bus (d[31:0]) the 32-bit, three-state, bidirecti onal, non-multiplexed data bus transf ers data to and from the MCF5272. a read or write operation can transfer 8, 16, or 32 bits in one bus cycle. when a 16-bit data bus is used, mode parallel port c pins ca n be multiplexed onto d[15:0]. data read from or written to on-ch ip peripherals is visible on the external data bus when the device?s external bus width is 32 bits. when the device is configured for external 16-bit wide data bus and the data access is 32 bits wide, the lower 16 bits of on-chip data are not visible externally. on-chip cache, rom, and sram accesses are not visible externally. 19.4.1 dynamic data bus sizing when the device is in normal mode, dynamic bus si zing lets the programmer change data bus width between 8, 32, and 16 bits for each ch ip select. the initial width for th e bootstrap program chip select, cs0 , is determined by the state of busw[1 :0]. the program should select bus widths for the other chip selects before accessing the asso ciated memory space. 19.5 chip selects (cs7 /sdcs , cs [6:0]) the eight chip selects, cs [7:0], allow the MCF5272 to interface directly to sram, eprom, eeprom, and external memory-mappe d peripherals. these signals can be programmed for an address location, with masking capabilities, port size, burst capabili ty indication, and wait-state generation. cs0 provides a special function as a global chip select that allows access to boot rom at reset. cs0 can have its address redefi ned after reset. cs0 is the only chip select initiali zed and enabled during reset. all other chip selects are disabled at reset and must be initialized by device initialization software. cs7 /sdcs can be configured to access ram or rom or one physical bank of sdram. only cs7 can be used for sdram chip select.
signal descriptions MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 19-20 freescale semiconductor 19.6 bus control signals this section describe s bus control signals. 19.6.1 output enable/read (oe /rd) the output enable/read signal (oe /rd) defines the data transfer dire ction for the data bus d[31:0] for accesses to sram, rom or external peripherals. a lo w (logic zero) level indicat es a read cycle while a high (logic one) indicates a write cycle. this signal is normally connected to the oe pins of external sram, rom, or flash. 19.6.2 byte strobes (bs [3:0]) the byte strobes (bs [3:0]) define the flow of data on the data bus. during sram and peripheral accesses, these outputs indicate that data is to be latched or driven onto a byte of the data when driven low. bs n signals are asserted only to the memory byt es used during a read or write access. bs n signals are asserted during accesses to on-chip pe ripherals but not to on-chi p sram, cache, or rom. during sdram accesses, these signals indicate a byte transfer betw een sdram and the MCF5272 when driven high. for sram or flash devices, bs [3:0] outputs should be connected to individual byte strobe signals. for sdram devices, bs [3:0] should be connected to individua l sdram dqm signals. note that most sdrams associate dqm3 with the msb, in which case bs3 should be connected to the sdram's dqm3 input. table 19-3. byte strobe operation for 32-bit data bus bs3 bs2 bs1 bs0 access type access size data located on 1111 none none ? 1110flash/sram byte d[31:24] 1101flash/sram d[23:16] 1 0 1 1 flash/sram d[15:8] 0111flash/sram d[7:0] 1 1 0 0 flash/sram word d[31:16] 0 0 1 1 flash/sram d[15:0] 0 0 0 0 flash/sram longword d[31:0] 1110 sdram byte d[7:0] 1 1 0 1 sdram d[15:8] 1011 sdram d[23:16] 0111 sdram d[31:24] 1 1 0 0 sdram word d[15:0] 0011 sdram d[31:16] 0 0 0 0 sdram longword d[31:0]
signal descriptions MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 19-21 note in 16-bit bus mode, longword accesse s are performed as two sequential word accesses. table 19-6 shows how bs [3:0] should be connected to dqm x for 16- and 32-bit sdram configurations. 19.6.3 read/write (r/w ) r/w is programmed on a per-chip-select basis for use with sr am and external peri pheral write accesses. it should be connected to the external pe ripheral or memory write enable signal. r/w acts as a write strobe to external sram when the decoded chip se lect is configured for either of the two sram/rom modes. it is asserted during on-ch ip peripherals accesses a nd negated during on-chip sram accesses. table 19-4. byte strobe operation for 16-bit data bus?sram cycles bs1 bs0 access size data located on 1 1 none ? 1 0 byte d[31:24] 0 1 byte d[23:16] 0 0 word d[31:16] table 19-5. byte strobe operation for 16-bit data bus?sdram cycles bs3 bs2 access type data located on 1 1 none ? 1 0 byte d[23:16] 0 1 byte d[31:24] 0 0 word d[31:16] table 19-6. connecting bs [3:0] to dqm x 5272 sdram data signals 16 bit 32 bit 16 bit 32 bit (2 x 16) 32 bit (1 x 32) bs3 bs3 dqmh dqmh dqm3 d[31:24] bs2 bs2 dqml dqml dqm2 d[23:16] nc bs1 nc dqmh dqm1 d[15:8] nc bs0 nc dqml dqm0 d[7:0]
signal descriptions MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 19-22 freescale semiconductor 19.6.4 transfer acknowledge (ta /pb5) assertion of the tran sfer acknowledge (ta /pb5) input terminates an external bus cycle. it is enabled on a per chip select basis by programmi ng the wait state field to 0x1f in the corresponding chip select option register (csor n [ws]). this pin requires a 4.7- k? pull-up resistor or external logic that drives inactive high. ta must always be returned high before it can be detected again. asserting ta into the next bus cycle has no effect and does not terminate the bus cycle. note: even though ebi modes set to sdram re quire setting the wait state field in the chip select option register to 31, a low signa l should never be applied to ta during such accesses. for sd ram accesses the bus cycle is terminated internally by ci rcuitry in the sdram module. 19.6.5 hi-z hiz is a test signal. when it is conn ected to gnd during reset, all output pins are driven to high impedance. a 4.7-k? pullup resistor should be connected to this signal if the hi-z func tion is not used. hi-z configuration input is sampled on the rising edge of reset output (rsto ). 19.6.6 bypass bypass is a freescale test mode signal. this signal s hould be left unconnected. 19.6.7 sdram row address strobe (ras0 ) ras0 is the sdram row address strobe output. 19.6.8 sdram column ad dress strobe (cas0 ) cas0 is the sdram column address strobe output. 19.6.9 sdram clock (sdclk) the sdram clock output (sdclk) is th e same frequency as the cpu clock. 19.6.10 sdram write enable (sdwe ) this output is the sdram write enable. 19.6.11 sdram clock enable (sdclke) this output is the sdram clock enable.
signal descriptions MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 19-23 19.6.12 sdram bank selects (sdba[1:0]) these outputs are the sd ram bank select signals. 19.6.13 sdram row address 10 (a 10)/a10 precharge (a10_prechg) this output is the sdram row addr ess 10 and the precharge strobe. 19.7 cpu clock and reset signals this section describes clock and reset signals in the cpu. 19.7.1 rsti rsti is the primary reset input to the device. asserting rsti immediately resets th e cpu and peripherals. however, the reset of the sdram controller and hence sdram cont ents depend on dreseten . asserting rsti also causes rsto to be asserted for 32k cpu clock cycles. 19.7.2 dreseten dreseten is asserted to indicate that the sdram controller is to be reset whenever rsti asserts. if dreseten is high, rsti does not affect the sdram controller, which continues to refresh external memory. this is useful for debug si tuations where a reset of the devi ce is required without losing data located in sdram. dreseten is normally tied high or low depe nding on system require ments. it should never be tied to rsti or rsto . 19.7.3 cpu external clock (clkin) clkin should be connected to an external clock os cillator. the clkin input frequency can range from dc to 66 mhz. the frequency input to this signal must be greater than twice the frequency applied at e_tx clk. the clock frequency applied to clkin must exceed 24 mhz when the system uses a usb peripheral. 19.7.4 reset output (rsto ) reset output (rsto ) is driven low for 128 cpu clocks when the soft reset bit of the system configuration register (scr[softrst]) is set. it is driven low for 32k cpu clocks when th e software watchdog timer times out or when a low input level is applied to rsti . 19.8 interrupt request inputs (int [6:1]) the six interrupt request inputs (int [6:1]) can generate separate, mask able interrupts on negative edge (high to low) or positive edge (low to high) tr ansitions. in addition to the triggering edge being programmable, the priority can also be programmed. each interru pt input has a separate programmable interrupt level.
signal descriptions MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 19-24 freescale semiconductor after a device reset, int [4:1] are enabled but the function is masked. int4 /din3 function can be changed by software. int [3:1] functions are always assigned to dedicated pins. interrupts int [6:4] are multiplexed with other functions as follows: ? dgnt1_int6 /pa15_int6 ?int5 /urt1_rts ?int4 /din3 int1 is also internally connected to the usc_wor function. the int6 function is always available regardless of the other functions enabled on this pin. 19.9 general-purpose i/o (gpio) ports each of the three gpio ports is 16 bits wide. each port line can be individually configured as input or output. except where indicated, each pin function is independently se lectable betwee n the corresponding port pin or the other functions that may be multiplexed onto the pin. after reset all pins multiplexed with gpio signals default to inputs. port a general purpose i/o, pa[15:8] ar e multiplexed with plic tdm port 1 pins. port a general purpose i/o, pa[6:0] are multiplexe d with usb module signals. pa7 is multiplexed with qspi_cs3 and dout3. port b general purpose i/o, pb[4:0] are multiplex ed with the uart0 interf ace pins. if the uart0 interface is enabled, pb[4:0] are unava ilable. pb5 is multiplexed with ta . pb6 is dedicated. pb7 is multiplexed with tout0. port b general purpose i/o, pb[15:8] are multiplexed with the ethernet interface pins. if the ethernet interface is enabled, pb [15:8] are unavailable. port c general purpose i/o, pc[15: 0] are multiplexed with d[15:0]. when 32-bit wide bus mode is selected, port c is unavailable. 19.10 uart0 module signals and pb[4:0] the uart0 module uses the signals in th is section for data and clock signals. these signals are multiplexed with the gpio port b signals pb[4:0]. 19.10.1 transmit serial data output (urt0_txd/pb0) uart0 mode: urt0_txd is the transm itter serial data output for the uart0 module. the output is held high (mark condition) when the transmit ter is disabled, idle, or in the lo cal loopback mode. data is shifted out, lsb first, on this pin at the fa lling edge of the serial clock source. port b mode: this pin can also be configured as the pb0 i/o.
signal descriptions MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 19-25 19.10.2 receive serial data input (urt0_rxd/pb1) uart0 mode: urt0_rxd is the receiv er serial data input for the ua rt0 module. data received on this pin is sampled on the rising edge of the serial clock source lsb first. when the uart0 clock is stopped for power-down mode, any transiti on on this pin restarts it. port b mode: this pin can also be configured as the pb1 i/o. 19.10.3 clear-to-send (urt0_cts /pb2) uart0 mode: asserting the urt0_cts input is the clear-to-send (cts ) input, indicating to the uart0 module that it can begin data transmission. port b mode: this pin can also be configured as the pb2 i/o. 19.10.4 request to send (urt0_rts /pb3) uart0 mode: asserting urt0_rts output is an automatic request to send output from the uart0 module. urt0_rts can also be configured to be asserted a nd negated as a function of the rxfifo level. port b mode: this pin can also be configured as the pb3 i/o. 19.10.5 clock (urt0_clk/pb4) uart0 mode: urt0_clk provides a clock input that can be a 1x or 16x baud rate clock. port b mode: this pin can also be configured as the pb4 i/o. 19.11 usb module signals and pa[6:0] the usb module uses the signals in this section for data and clock si gnals. these signals are multiplexed with the gpio port a signals pa[6:0]. 19.11.1 usb transmit serial data output (usb_tp/pa0) usb mode: usb_tp is the non-i nverted data transmit output. port a mode: this pin can also be configured as the pa0 i/o. 19.11.2 usb receive serial data input (usb_rp/pa1) usb mode: usb_rp is the non-i nverted receive data input. port a mode: this pin can also be configured as the pa1 i/o. 19.11.3 usb receive data negative (usb_rn/pa2) usb mode: usb_rn is the inverted receive data input. port a mode: this pin can also be configured as the pa2 i/o.
signal descriptions MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 19-26 freescale semiconductor 19.11.4 usb transmit data negative (usb_tn/pa3) usb mode: usb_tn is the inve rted data transmit output. port a mode: this pin can also be configured as the pa3 i/o. 19.11.5 usb suspend driver (usb_susp/pa4) usb mode: usb_susp is used to put the usb driver in suspend operation. port a mode: this pin can also be configured as the pa4 i/o. 19.11.6 usb transmitter output enable (usb_txen /pa5) usb mode: usb_txen enables the transceiver to transmit da ta on the bus. it requires a 4.7-k? pullup resistor to ensure that the external usb tx driv er is off between the MCF5272 coming out of reset and initializing the port a pin configuration register. port a mode: this pin can also be configured as the pa5 i/o. 19.11.7 usb rx data output (usb_rxd/pa6) usb mode: usb_rxd is the receive data output from the differenti al receiver inputs usb_rn and usb_rp. port a mode: this pin can also be configured as the pa6 i/o. 19.11.8 usb_d+ and usb_d- usb_d+ and usb_d- are the on-chip usb interface tr ansceiver signals. when these signals are enabled, the usb module uses them to comm unicate to an external usb bus. wh en not used, each signal should be pulled to vdd using a 4.7-k? resistor. 19.11.9 usb_clk usb_clk is used to connect an external 48-mhz oscill ator to the usb module. wh en this pin is tied to gnd or vdd, the usb module automa tically uses the internal cpu cl ock. in this case the clkin must be 48 mhz if the system is to use the usb function. 19.11.10 int1 /usb wake-on-ring (usb_wor) the usb module allows for int1 to generate the usb wake-on-ring signal to the usb host controller. this function is enabled by a contro l bit in the usb module. wor is pr ovided to allow the cpu and the usb interface to be woken up when in power down mode. this occurs when the usb controller detects a resume state at the usb inputs. the interrupt output of an isdn transceiver, such as the mc145574, can be connected to int1 /usb_wor. before putting the device into sleep mode, the usb module?s wake on ring function
signal descriptions MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 19-27 can be enabled, the int1 interrupt can be disabled, and usb power-down modes can be enabled along with its interrupt. then when the is dn transceiver is activated, its inte rrupt request can generate the usb wake on ring signal, which causes the host controller on the pc to initiat e usb traffic to the device. this in turn causes the usb module to wake up the cpu. note that usb_wor, when configured by setting usbepctl0[wor_en], is level-sensitive. 19.12 timer module signals this section describes timer module signals. 19.12.1 timer input 0 (tin0) the timer input (tin0) can be program med to cause events to occur in ti mer counter 1. it can either clock the event counter or provide a trigge r to the timer value capture logic. 19.12.2 timer output (tout0)/pb7 timer mode: timer output (tout0) is the output from timer 0. port b mode: this pin can also be configured as i/o pin pb7. 19.12.3 timer input 1 (tin1)/p wm mode output 2 (pwm_out2) timer mode: timer input 1 (tin1) can be programmed as an input that causes ev ents to occur in timer counter 2. this can either clock the event counter or provide a trigger to the timer value capture logic. pwm mode: pulse-width modulato r 2 (pwm_out2) compare output. 19.12.4 timer output 1 (tout1)/ pwm mode output 1 (pwm_out1) timer mode: timer output (tout1) is the output from timer 1. pwm mode: pulse-width modulato r 1 (pwm_out1) compare output. 19.13 ethernet module signals the following signals are used by the ethe rnet module for data and clock signals. these signals are multiplexed with the parallel port b pb15?pb8 signals. 19.13.1 transmit clock (e_txclk) this is an input clock which provides a timing reference for e_txen, e_txd[3:0] and e_txer.
signal descriptions MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 19-28 freescale semiconductor 19.13.2 transmit data (e_txd0) e_txd0 is the serial output ethernet data and is onl y valid during the assertion of tx_en. this signal is used for 10-mbps ethernet data. this signal is also used for mi i mode data in conjunction with e_txd[3:1]. 19.13.3 collision (e_col) the e_col input is asserted upon detection of a collisi on and remains asserted whil e the collision persists. this signal is not defined for full-duplex mode. 19.13.4 receive data valid (e_rxdv) asserting the receive data valid (e _rxdv) input indicates that the ph y has valid nibbles present on the mii. e_rxdv should remain asserted from the firs t recovered nibble of the frame through to the last nibble. assertion of e_rxdv must start no later than the sfd and exclude any eof. 19.13.5 receive clock (e_rxclk) the receive clock (e_rxclk) input provides a timing reference for e_rxdv, e_rxd[3:0], and e_rxer. 19.13.6 receive data (e_rxd0) e_rxd0 is the ethernet input data transferred from the phy to the me dia-access controller when e_rxdv is asserted. this signal is used for 10-mbps ethernet data. th is signal is also used for mii mode ethernet data in conjunction with e_rxd[3:1]. 19.13.7 transmit enable (e_txen) the transmit enable (e_txen) output indicates when valid nibbles are pr esent on the mii. this signal is asserted with the first nibble of a preamble and is negated before th e first e_txclk following the final nibble of the frame. 19.13.8 transmit data (e_txd[3:1]/pb[10:8]) ethernet mode: these pins contain th e serial output ethernet data and are valid only during assertion of e_txen in mii mode. port b mode: these pins can also be configured as i/o pins pb[10:8]. 19.13.9 receive data (e _rxd[3:1]/pb[13:11]) ethernet mode: these pins contain th e ethernet input data transferred from the phy to the media-access controller when e_rxdv is as serted in mii mode operation. port b mode: these pins can also be configured as i/o pins pb[13:11].
signal descriptions MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 19-29 19.13.10 receive error (e_rxer/pb14) ethernet mode: e_rxer is an input signal which when asserted along with e_rx dv signals that the phy has detected an error in the curren t frame. when e_rxdv is not asse rted e_rxer has no effect. applies to mii mode operation. port b mode: this pin can also be configured as pb14 i/o. 19.13.11 management data clock (e_mdc/pb15) ethernet mode: e_mdc is an output clock which provides a timing referenc e to the phy for data transfers on the e_mdio signal. applies to mii mode operation. port b mode: this pin can also be configured as i/o pin pb15. 19.13.12 management data (e_mdio) the bidirectional e_mdio signal transfers contro l information between the external phy and the media-access controller. data is synchronous to e_md c. applies to mii mode operation. this signal is an input after reset. when the fec is operated in 10mbps 7-wire interface mode, this signal should be connected to vss. 19.13.13 transmit error (e_txer) ethernet mode: when the e_txer output is asserted for one or more clock cycles while e_txen is also asserted, the phy sends one or more illegal symbols. e_txer has no effect at 10 mbps or when e_txen is negated. applies to mii mode operation. 19.13.14 carrier receive sense (e_crs) e_crs is an input signal which when asserted signals that tr ansmit or receive medium is not idle. applies to mii mode operation. 19.14 pwm module signals (pwm_out0?pwm_out2]) pwm_out0?pwm_out2 are the outputs of the comp are logic within the pulse-width modulator (pwm) modules. ? pwm_out0 is always available. ? pwm_out1 is multiplexed with tout1. ? pwm_out2 is multiplexed with tin1. 19.15 queued serial peripher al interface (qspi) signals this section describes signals used by the queued se rial peripheral interface (qspi) module. four qspi chip selects, qspi_cs[3:0], are multiplexed with the physical laye r interface pins and gpio port a. qspi_cs0 is always available. qspi_c s3 is multiplexed with dout3 and pa7.
signal descriptions MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 19-30 freescale semiconductor 19.15.1 qspi synchronous serial data output (qspi_dout/wsel) the qspi synchronous serial data output (qspi_dout) can be programmed to be driven on the rising or falling edge of sck. each byte is sent msb first. wsel configuration input is sampled on th e rising edge of reset output (rsto ). 19.15.2 qspi synchronous seri al data input (qspi_din) the qspi synchronous serial data input (qspi_din) can be programmed to be sampled on the rising or falling edge of qspi_clk. each byte is written to ram lsb first. 19.15.3 qspi serial clock (qspi_clk/busw1) the qspi serial clock (qspi_clk/b usw1) provides the serial clock from the qspi. the polarity and phase of qspi_clk are programmabl e. the output frequency is programm ed according to the following formula, in which n can be any value between 1 and 255: qspi_clk = clkin/(2 n ) at reset, qspi_clk/busw1 is used to conf igure the width of memo ry connected to cs0 . busw1 configuration input is sampled on the rising edge of reset output (rsto ). 19.15.4 synchronous peripheral chip select 0 (qspi_cs0/busw0) the synchronous peripheral chip sele ct 0 (qspi_cs0) output pr ovides a qspi periphera l chip select that can be programmed to be active high or low. during re set, this pin is used to configure the width of memory connected to cs0 . busw0 configuration input is sampled on the rising edge of reset output (rsto ). 19.15.5 synchronous peripheral chip select 1 (qspi_cs1/pa11) see section 19.16.1.9, ?qspi chip se lect 1 (qspi_cs1/pa11) .? qspi_cs1 can be programmed to be active high or low. 19.15.6 synchronous peripheral ch ip select 2 (qspi_cs2/urt1_cts ) see section 19.16.1.5, ?uart1 cts (urt1_cts/qspi_cs2) .? 19.15.7 synchronous peripheral ch ip select 3 (pa7/dout3/qspi_cs3) see section 19.16.3.3, ?qspi_cs3, port 3 gci/idl data out 3, pa7 (pa7/dout3/qspi_cs3) .? see description for gpio ports.
signal descriptions MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 19-31 19.16 physical layer interface cont roller tdm ports and uart 1 the MCF5272 has four dedicated physical layer inte rface ports for connecti ng to external isdn transceivers, codecs and other periphe rals. there are three sets of pins for these interfaces. port 0 has its own dedicated set of pins. ports 1, 2, and 3 share a se t of pins. port 3 can also be configured to use a dedicated pin set. ports 1, 2, and 3 alwa ys share the same data clock (dcl). 19.16.1 gci/idl tdm port 0. this section describes signals used by the plic module port 0 interface. 19.16.1.1 frame sync (fsr0/fsc0/pa8) idl mode: fsr0 is an input for the 8-khz frame sync for port 0. gci mode: fsc0 is an input for the 8- khz frame sync for port 0. it is active high in this mode. normally the gci fsc signal is two cl ocks wide and is aligned with the first b-channel bit of the gci frame. many u-interface devices including th e mc145572 and mc145576 change the widt h of fsc to one clock every 12 ms. this indicates u-in terface super frame boundary. port a mode: this pin can be in dependently configured as pa8. 19.16.1.2 d-channel grant (dgnt0/pa9) idl mode: this pin can be indepe ndently configured as the input, dgnt0, used by a layer-one isdn s/t transceiver to indicate that d- channel access has been granted. port a mode: this pin can be indepe ndently configured as i/o pin pa9. 19.16.1.3 data clock (dcl0/urt1_clk) idl mode: this pin is the clock used to clock data in and out of din0 and dout0 for idl port 0. data is clocked into din0 on the falling edge and cl ocked out of dout0 on the rising edge of dcl0. gci mode: this pin is used to cl ock data in and out of din0 and dout0 for gci port 0. dcl0 is twice the bit rate (two clocks per data bit). uart1: urt1_clk provides a clock input which can be the baud rate clock. 19.16.1.4 serial data input (din0/urt1_rxd) idl mode: the din0 input is for clocking data into idl port 0. data is clocked into din0 on the falling edge of dcl0. gci mode: the din0 input is for cloc king data into gci port 0. dcl0 is twice the bit rate (two clocks per data bit). uart1: urt1_rxd is the receiver seri al data input for the uart1 module. data received on this pin is sampled on the rising edge of the seri al clock source with the least signi ficant bit first. when the uart1 clock is stopped for power-down mode, a ny transition on this pin restarts it.
signal descriptions MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 19-32 freescale semiconductor 19.16.1.5 uart1 cts (urt1_cts /qspi_cs2) uart1: urt1_cts is the clear-to-send input indicating to the uart1 module that it can begin data transmission. qspi mode: this output pin provides a qspi peripheral chip select, qspi_cs2, when in master mode. qspi_cs2 can be programmed to be active high or low. 19.16.1.6 uart1 rts (urt1_rts /int5 ) interrupt mode: this pin can be used as int5 . uart1: the urt1_rts output is an automatic request to se nd output from the uart1 module. it can be configured to be asserted and nega ted as a function of the rxfifo level. 19.16.1.7 serial data ou tput (dout0/urt1_txd) idl mode: the dout0 output is for clocking data out of idl port 0. data is clocked out of dout0 on the rising edge of dcl0. gci mode: the dout0 output is for clocking data out of gci port 0. dc l0 is twice the bit rate (two clocks per data bit). uart1: urt1_txd is the transmitte r serial data output for the uart 1 module. the output is held high ('mark' condition) when the transmitte r is disabled, idle, or operating in the local loop back mode. data is shifted out, least significant bit first, on this pin at the falling edge of the serial clock source. 19.16.1.8 d-channel request(dreq0/pa10) idl mode: this pin can be independe ntly configured as th e dreq0 output for signa ling to a layer-1 s/t transceiver that a frame of data is re ady to be sent on the port 0 d channel. port a mode: in gci or idl modes this pin can be independently configured as pa10. 19.16.1.9 qspi chip select 1 (qspi_cs1/pa11) qspi mode: qspi_cs1 is a q spi peripheral chip select. port a mode: in gci or idl modes this pin can be independently configured as pa11. 19.16.2 gci/idl tdm port 1 physical layer interface port 1 is an additional gci/idl port. also in ternally connected to these pins are gci/idl serial ports 2 and 3. 19.16.2.1 gci/idl data clock (dcl1/gdcl1_out) idl mode: dcl1 is the data clock used to clock da ta in and out of the din1 and dout1 pins for idl port 1. data is clocked in to din1 on the falling edge of dcl1. data is clocked out of dout1 on the rising edge of dcl1.
signal descriptions MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 19-33 gci mode: gdcl1_out is used to cl ock data in and out of din1 a nd dout1 for gci por t 1. dcl1 is twice the bit rate; that is, two clocks per data bit. when this pin is configured as an output, the gd cl1_out clock signal from the on-chip synthesizer clock generator is output on this pin. also gdcl1_out is used to internally dr ive all ports and delayed sync generators associat ed with ports 1, 2, and 3. 19.16.2.2 gci/idl data out (dout1) idl mode: the dout1 output is for clocking data out of idl port 1. data is clocked out of dout1 on the rising edge of dcl1. dout1 is also used for clocking data from ports 2 and 3. gci mode: the dout1 output is for clocking data out of gci port 1. dcl1 is twice the bit rate, that is, two clocks per data bit. 19.16.2.3 gci/idl data in (din1) idl mode: the din1 input is for clocking data into idl port 1. data is clocked into din1 on the falling edge of dcl1. din1 is also used for clocking data into ports 2 and 3. gci mode: the din1 input is for clocking data into gci port 1. dcl1 is twice th e bit rate, that is, two clocks per data bit. din1 is also us ed for clocking data into ports 2 and 3. 19.16.2.4 gci/idl frame sy nc (fsc1/fsr1/dfsc1) idl mode: fsr1 is an input for the 8-khz frame sync for port 1. gci mode: fsc1 is an input for the 8-khz frame s ync for port 1. normally the gci fsc signal is two clocks wide and is aligned with the first b cha nnel bit of the gci frame. many u-interface devices including the mc145572 and mc145576 change the width of fsc to one clock every 12 ms, indicating a u-interface super frame boundary. the mcf 5272 can accept either frame sync width. when this pin is configured as an output, the dfsc1 sync signal from the on-c hip clock synthesizer is output on this pin. also dfsc1 is us ed to internally drive the port 1 frame sync and the delayed sync generators associated with ports 2 and 3. the widt h of dfsc1 can be configured for 1, 2, 8, or 16 dcl clocks duration. the location of dfsc1 is programma ble in single clock incr ements up to a maximum count of 0x3ff. 19.16.2.5 d-channel request (dreq1/pa14) idl mode: this pin can be configured as the dreq1 output in idl mode for signalling to a layer 1 s/t transceiver that a frame of data is re ady to be sent on the port 1 d channel. port a mode: i/o pin pa14. 19.16.2.6 d-channel grant (dgnt1_ int6 /pa15_ int6 ) this pin can be independently conf igured as the input, dgnt1, used by a layer one isdn s/t transceiver to indicate that d-channe l access has been granted.
signal descriptions MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 19-34 freescale semiconductor port a mode: i/o pin pa15. special interrupt mode: the int6 interrupt can be enabled independen tly of the pin being configured for dgnt1 or pa15. this is particularly useful when configured for pa15 operation because int6 can be used to signal a change of data on the pax pins. 19.16.3 gci/idl tdm ports 2 and 3 physical layer interface port 2 is an additional gci/idl por t. this physical layer interface shares the din1, dout1, and dcl1 pins of physical layer inte rface port 1. the operating m ode is selected by the same register control bit that se lects the operating mode for port 1. physical layer interface port 3 is an additional gci/idl por t. this physical layer interface shares the din1, dout1, and dcl1 pins of physical layer inte rface port 1. the operating m ode is selected by the same register control bit that se lects the operating mode for port 1. port 3 can also have its input and output signa ls redirected to din3 and dout3 respectively. 19.16.3.1 gci/idl delayed frame sync 2 (dfsc2/pa12) idl/gci modes: dfsc2 is used as a programmable delayed frame sync fo r external idl/gci devices that use port 2 but are connected to the port 1 data pins. port 2 uses the dfsc2 frame s ync internally to ensure alignment with external devices sy nchronized with dfsc2. the width of this signal can be configured for 1, 2, 8, or 16 dcl clocks duration. th e location of this frame sync is programmable in single clock increments up to a maximum count of 0x3ff. port a mode: i/o pin pa12. 19.16.3.2 gci/idl delayed frame sync 3 (dfsc3/pa13) output pin dfsc3. this active high signal is used as a programmable delayed frame sync for external idl/gci devices that use por t 3 but are connected to th e port 1 or port 3 data pi ns. port 3 uses the dfsc3 frame sync internally to ensure alignment with external devices s ynchronized with dfsc3. the width of this signal can be configured for 1, 2, 8, or 16 dcl cl ocks duration. the location of this frame sync is programmable in single clock incremen ts up to a maximum count of 0x3ff. port a mode: i/o pin pa13. 19.16.3.3 qspi_cs3, port 3 gci/idl data out 3, pa7 (pa7/dout3/qspi_cs3) qspi mode: the qspi chip select, qspi_cs3, is the default configurat ion after device reset. qspi_cs3 can be programmed to be active high or low. idl mode: this pin can be configured as a dedicated output for clocking data out of idl port 3. data is clocked out of dout3 on the rising edge of dcl1. after device reset port 3 is connected to dout1 by setting a bit in the plic m odule configuration register, th is pin can be configured as a dedicated output for idl/gci port 3.
signal descriptions MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 19-35 gci mode: this pin can be configured as a dedicated output for clocking data out of gci port 3. data is clocked out of dout3 on the rising edge of dcl1. dcl1 is twi ce the bit rate, that is , two clocks per data bit. this is done by setting a bit in the plic module configuration register this pin can be configured as a dedicated output for idl/gci port 3. port a mode: i/o pin pa7. 19.16.3.4 int4 and port 3 gci/idl data in (int4 /din3) idl mode: this pin can be configured as a dedicated input, din3, for clocking data into idl port 3. data is clocked into din3 on the falling edge of dcl1. data is clocked into din3 on the falling edge of dcl1. this is done by setting a bit in the pl ic module configuration register. note that the appropriate bits must be set in the pin configur ation register to reassign this pin from the interrupt module to the plic module. gci mode: this pin can be configur ed as a dedicated input, din3, for clocking data into gci port 3. dcl1 is twice the bit rate, that is, two clocks per data bi t. this is done by setti ng a bit in the plic module configuration register. note that the appropriate bits must be set in the pin configuration register to reassign this spin from the interrupt module to the plic module. interrupt mode: this signal can be configured as interrupt input 4. 19.17 jtag test access port and bdm debug port the MCF5272 supports the freescale background debug m ode (bdm) for coldfire processors. it also supports a jtag test interface. the following signals do not support jtag due to th e critical timing required to support sdram memory: bs [3:0], ras0 , cas0 , sdclk, sdclke, sdramcs /cs7 , sdwe , a10_prechg, sdba[1:0], d[31:0], a[15:0]. 19.17.1 test clock (tck/pstclk) jtag mode: tck is the dedicated jtag test logic clock, indepe ndent of the cpu system clock. this input provides a clock for on-board test logi c defined by the ieee 1149.1 standard. tck should be grounded if the jtag port is not used and mtmod is tied low. bdm mode: pstclk is an output at the same frequency as the cpu cl ock. it is used fo r indicating valid processor status data on the pst and ddata pins. 19.17.2 test mode select and force breakpoint (tms/bkpt ) jtag mode: the tms input controls test mode opera tions for on-board test logic defined by the ieee 1149.1 standard. connecting tms to vdd disables the test controll er, making all jtag circuits transparent to the system. bdm mode: the hardware breakpoint input, bkpt , requires a 10-k? pullup resistor.
signal descriptions MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 19-36 freescale semiconductor 19.17.3 test and debug data out (tdo/dso) jtag mode: the tdo output is for shifting data out of the serial data port logic. shifting out of data depends on the state of the jtag cont roller state machine and the instruct ions currently in the instruction register. this data shift occurs on the falling edge of tck. when tdo is not out putting data it is placed in a high-impedance state. tdo can al so be three-stated to allow bussed or parallel connections to other devices having jtag test access ports. bdm mode: dso is the debug data output. 19.17.4 test and debug data in (tdi/dsi) jtag mode: the tdi input is for loading the serial data port shift registers (boundary scan registers, bypass register and instruction regist er). shifting in of data depends on the state of the jtag controller state machine and the instruction currently in the instru ction register. data is shif ted in on the rising edge of tck. bdm mode: dsi is the debug serial data input. this signal requires a 10-k? pullup resistor. 19.17.5 jtag trst and bdm data clock (trst /dsclk) jtag mode: trst asynchronously resets the jtag tap logic when low. bdm mode: dsclk is the bdm serial data cloc k input. it requires a 10-k? pullup resistor. 19.17.6 freescale test mode select (mtmod) mtmod: when the mtmod input is low, jtag m ode is enabled. when it is high, bdm mode is enabled. 19.17.7 debug transfer error acknowledge (tea ) an external slave asserts the tea input to indicate an error condition for the current bus transfer. it is provided to allow full debug port capability. the assertion of tea causes the MCF5272 to abort the current bus cycle. if a 10-k? pullup resistor is not connected, extern al logic must drive tea high when it is inactive. tea has no effect during sdram a ccesses. if high parasitic capac itance occurs on the printed circuit board, a lower value pullup resistor may be needed. 19.17.8 processor status outputs (pst[3:0]) pst[3:0] outputs indicate core status, as shown in table 19-7 . debug mode timing is synchronous with the processor clock; status is unrel ated to the current bus transfer.
signal descriptions MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 19-37 19.17.9 debug data (ddata[3:0]) debug data signals (ddata[3:0]) display captu red processor data a nd breakpoint status. 19.17.10 device test enable (test ) test is used to put the device into various manufacturing test modes. it should be tied to vdd for normal operation. 19.18 operating mode configuration pins the MCF5272 has four mode-select signals, some of which are shared with output signals used during normal device operation. these signals are hi -z, qspi_dout/wsel, qspi_clk/busw1, and qspi_cs0/busw0. bypass is a freescale test mode signal and should never ha ve a pull-down resistor. the remaining three mode-select signals must each have a 4.7-k? pull-up or pull-down resistor. these signals are sampled on the rising edge of reset output (rsto ). table 19-7. processor status encoding pst[3:0] definition 0000 continue execution 0001 begin execution of an instruction 0010 begin execution of pulse instruction or wddata. 0011 entry into user mode 0100 begin execution of pulse instruction 0101 begin execution of taken branch 0110 reserved 0111 begin execution of rte instruction 1000 begin 1 byte transfer on ddata 1001 begin 2 byte transfer on ddata 1010 begin 3 byte transfer on ddata 1011 begin 4 byte transfer on ddata 1100 1 1 these encodings are asserted for multiple cycles. exception processing 1101 1 emulator mode entry exception processing 1110 1 processor is stopped, waiting for an interrupt 1111 1 processor is halted
signal descriptions MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 19-38 freescale semiconductor 19.19 power supply pins the vdd/gnd pins are connected to 3.3 v suppl y and associated ground. when the on-chip usb transceiver is used, the usb_vdd and usb_gnd pi ns are connected to the 3.3 v device supply and associated ground. when the on-chip usb transceiver is not used, usb_gnd should be connected to the device gnd and usb_vdd left unc onnected. refer to section 12.2.1.1 usb transceiver interface. table 19-8. MCF5272 bus width selection wsel data bus width 032 bits 116 bits table 19-9. MCF5272 cs0 memory bus width selection busw1 busw0 cs0 bus width 0 0 32 bits 0 1 8 bits 1 0 16 bits 1 1 reserved, do not use. table 19-10. MCF5272 high impedance mode selection hi-z data bus width 0 enable hi-z mode, all pins are high impedance 1 normal operation
MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 20-1 chapter 20 bus operation the MCF5272 bus interface supports synchronous data transfers that can be terminated synchronously or asynchronously and also can be burst or burst-inhi bited between the MCF5272 and other devices in the system. this chapter describes the functioning of the bus for data-trans fer operations, error conditions, bus arbitration, and reset oper ations. it includes detail ed timing diagrams showi ng signal interaction. refer also to figure 19-1 for an overview of how the signals in teract with each module of the MCF5272. operation of the bus is defined for transfers initiated by the mcf 5272 as a bus master. the MCF5272 does not support external bus masters. the MCF5272 has th ree on-chip bus masters? the cpu, the ethernet controller, and the memory-to-memory dma controller. 20.1 features the following list summarizes the key bus operation features: ? 23 bits of address and 32 bits of data ? device physical data bus width configurable for 16 or 32 bits ? accesses 8-, 16-, and 32-bit port sizes ? generates byte, word, longwor d, and line size transfers ? burst and burst-inhi bited transfer support ? internal termination generation 20.2 bus and control signals table 20-1 summarizes MCF5272 bus signals described in chapter 19, ?signal descriptions . ? table 20-1. coldfire bus signal summary signal name description i/o a[22:0] address bus o bs[3:0] byte strobes o cs [7:0] chip selects o d[31:0] data bus i/o int [6:1] interrupt request i oe output enable o r/w read/write o ta transfer acknowledge i tea transfer error acknowledge i
bus operation MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 20-2 freescale semiconductor 20.2.1 address bus (a[22:0]) these output signals provide the lo cation of a bus transfer. the addr ess can be external sram, rom, flash, sdram, or peripherals. note the coldfire core outputs 32 bits of address to the internal bus controller. of these 32 bits, only a[22:0] are output to pins on the MCF5272. 20.2.2 data bus (d[31:0]) these three-state bidirectional si gnals provide the general-purpose da ta path between the MCF5272 and all other devices. the data bus can transfer 8, 16, 32, or 128 bits of data pe r bus transfer. the MCF5272 can be configured for an external physical data bus of 32- or 16-bits width. when configured for 16-bit external data bus width, d[ 15:0] become gpio port c. a write cycle drives all 32 or 16 bits of the data bus regardless of the chip se lect port width and operand size. 20.2.3 read/write (r/w ) this output signal defines the data transfer direction for the current bus cycle. a high (logic one) level indicates a read cycle; a low (logi c zero) level indicates a write cycle. during sdram bus cycles r/w is driven high. when the cpu is in sleep or stop modes, this signal is driven high. note use the oe signal to control any external data bus transceivers. in systems containing numerous external peripherals, the chip se lects should be used to qualify any external transceivers. this ensures the transceivers are active only when the desired peripheral is accessed. using only the r/w signal to control an external transceiver may lead to data bus conflicts in some system architectures. 20.2.4 transfer acknowledge (ta ) this active-low synchronous input signal indicates the successful completion of a requested data transfer operation. during MCF5272-initiated tran sfers, transfer acknowledge (ta ) is an asynchronous input signal from the referenced slave device indicating completion of the transfer. the MCF5272 edge-detects and retimes the ta input. this means that an a dditional wait state may or may not be inserted. for example if the active chip select is used to imme diately generate the ta input, one or two wait states may be inserted in the bus access. the ta signal function is not available after reset. it must be enabled by configuring the appropriate pin configuration register bits along with the value of csor n [ws]. if ta is not used, it should either have a pullup resistor or be driven through gating logic that always ensures th e input is inactive. ta should be negated on the negating edge of the active chip select.
bus operation MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 20-3 ta must always be negated before it can be recognized as asserted again. if held asserted into the following bus cycle, it has no effect and does not terminate the bus cycle. note for the MCF5272 to accept the transfer as successful with a transfer acknowledge, tea must be negated throughout the transfer. ta is not used for termination during sdram accesses. 20.2.5 transfer error acknowledge (tea ) an external slave asserts this active-low input signal to abort a transfer. the assertion of tea immediately aborts the bus cycle. the assertion of tea has precedence over the assertion of ta . the MCF5272 edge-detects and retimes the tea input. tea is an asynchr onous input signal. the tea signal function is available after reset. if tea is not used, a pullup resistor or gating logic must be used to ensure the input is inactive. tea should be negated on the negating edge of the active chip select. tea must always be negated before it can be recogni zed as asserted again. if held asserted into the following bus cycle, it has no eff ect and does not abort the bus cycle. tea has no affect during sdram accesses. 20.3 bus exception: double bus fault when a bus error or an address error occurs duri ng the exception processing sequence for a previous bus error, a previous address error, or a reset exception, the bus or address error cau ses a double bus fault. if the MCF5272 experiences a double bus fault, it enters the halted state. to exit the halt state, reset the MCF5272. 20.4 bus characteristics the MCF5272 uses the address bus (a[22:0]) to specify the location for a data transfer and the data bus (d[31:0] or d[31:16]) to transfer the data. control signals indi cate the direction of the transfer. the selected device or the number of wa it states programmed in the chip se lect base registers (csbrs), the chip select option registers (cso rs), the sdram configuration a nd sdram timing registers (sdcr, sdtr) control the length of the cycle. the MCF5272 clock is distributed internally to provide logic timing. all sram and rom mode bus signals should be considered as asynchronous with respect to clki n. sdcr[inv] allows the sdram control signals to be asserted a nd negated synchronous with the risi ng or falling edge of sdclk. the sdram control signals are bs [3:0], sdba[1:0], ras0 , cas0 , sdwe , a10_prechg, sdclke, and cs7 /sdcs . the asynchronous int [6:1] signals are internally synchronized to resolve the input to a valid level before being used.
bus operation MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 20-4 freescale semiconductor 20.5 data transfer mechanism the MCF5272 supports byte, word, and longword operands and allows acce sses to 8-, 16-, and 32-bit data ports. the MCF5272 supports por t sizes of the specific memory, enab les internal generation of transfer termination, and sets the number of wait states for the external slave being accessed by programming the csbrs, csors, sdcr, and sdtr. fo r more information on programming these registers, refer to the sim, chip select, and sdram controller chapters. note the MCF5272 compares the address for the current bus transfer with the address and mask bits in the csbr s and csors looking for a match. the priority is listed in table 20-2 (from highest priority to lowest priority): 20.5.1 bus sizing the MCF5272 can be configured for an external physical data bus width of 16 bits by pulling qspi_dout/wsel high, or for 32 bits by pulling qspi_d out/wsel low during reset. when the external physical address bus size is confi gured for 16 bits, the signals d[15:0 ] become general purpose i/o port c. the MCF5272 determines the port size fo r each transfer from the csbrs at the start of each bus cycle. this allows the MCF5272 to transfer operands from 8- , 16-, or 32-bit ports. the size of the transfer is adjusted to accommodate the port si ze indicated. a 32-bit port must resi de on data bus bits d[31:0], a 16-bit port must reside on data bus bits d[31:16], and an 8- bit port must reside on data bus bits d[31:24]. this requirement ensures that the MCF5272 correctly transfers valid data to 8-, 16-, and 32-bit ports. the bytes of operands are designated as shown in figure 20-1 . the most significant byte of a longword operand is op0; op3 is the least significant byte. the two bytes of a word length operand are op2 (most significant) and op3. the single byte of a byte length operand is op3. these designations are used in the figures and descriptions that follow. table 20-2. chip select memory address decoding priority priority chip select highest chip select 0 chip select 1 chip select 2 chip select 3 chip select 4 chip select 5 chip select 6 lowest chip select 7
bus operation MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 20-5 figure 20-1. internal operand representation figure 20-2 shows the required organization of data ports on the MCF5272 fo r 8-, 16-, and 32 bit devices. the four bytes shown are c onnected through the internal data bus and data multiplexer to the external data bus. this path is how the MCF5272 supports programmable port si zing and operand misalignment. the data multiplexer establishes the ne cessary connections for different co mbinations of address and data sizes. figure 20-2. MCF5272 interface to various port sizes the multiplexer takes the four bytes of the 32-bit bu s and routes them to their required positions. for example, op3 can be r outed to d[7:0], as would be the normal case when interfacing to a 32-bit port. op3 can be routed to d[23:16] for interfaci ng to a 16-bit port, or it can be r outed to d[31:24] for interfacing to an 8-bit port. the operand size, address, and port size of the memory being accessed determines the positioning of bytes. longword operand word operand byte operand 31 0 15 0 70 op3 op3 op3 op2 op2 op0 op1 register multiplexer external data bus address byte 0 internal to MCF5272 8-bit port 16-bit port 32-bit port byte 1 byte 2 byte 3 byte 0 byte 1 byte 2 byte 3 byte 0 byte 1 byte 2 byte 3 d[31:24] d[23:16] d[15:8] d[7:0] routing and duplication op0 op1 op2 op3 a1 a0 00 00 10 00 01 10 11
bus operation MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 20-6 freescale semiconductor table 20-3 through table 20-5 describe data bus byte strobes. no te that most sdrams associate dqm3 with the msb, thus bs3 should be connected to the sdram's dqm3 input. table 20-3. byte strobe operation for 32-bit data bus bs3 bs2 bs1 bs0 access type access size data located on 1111 none none ? 1110flash/sram byte d[31:24] 1101flash/sram d[23:16] 1 0 1 1 flash/sram d[15:8] 0111flash/sram d[7:0] 1 1 0 0 flash/sram word d[31:16] 0 0 1 1 flash/sram d[15:0] 0 0 0 0 flash/sram longword d[31:0] 1110 sdram byte d[7:0] 1 1 0 1 sdram d[15:8] 1011 sdram d[23:16] 0111 sdram d[31:24] 1 1 0 0 sdram word d[15:0] 0011 sdram d[31:16] 0 0 0 0 sdram longword d[31:0] table 20-4. byte strobe operation for 16-bit data bus?sram cycles bs1 bs0 access size data located on 1 1 none ? 1 0 byte d[31:24] 0 1 byte d[23:16] 0 0 word d[31:16] table 20-5. byte strobe operation for 16-bit data bus?sdram cycles bs3 bs2 access type data located on 1 1 none ? 1 0 byte d[23:16] 0 1 byte d[31:24] 0 0 word d[31:16]
bus operation MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 20-7 table 20-6 lists the bytes that should be driven on the data bus during read cycles by the external peripheral device being accessed, and the pattern of the data transfer for write cycles to the external data bus. for read cycles, the entries shown as byte x are portions of the requested operand that are read. the operand being read is defined by the size of the transfer and a[1:0] fo r the bus cycle. bytes labeled ?x? are don?t cares and are not required during that read cycle. bytes labeled ??? are not valid transfers. for write cycles from the internal multiplexer of the MCF5272 to the external data bus a[1:0] is incremented according to the transfer size. for example, if a longword tran sfer is generated to a 16-bit port, the MCF5272 starts the cycle with a[1:0] set to 0x0 and reads the first word. the address in then incremented to 0x2 and the second word is read. the data for both word reads is taken from d[31:16]. bytes labeled ?x? are don?t cares. 20.6 external bus interface types the MCF5272 supports three types of external bus in terfaces. the interface type is programmed using csbr n [ebi]. the ebi codes are summarized in table 20-7 . table 20-6. data bus require ment for read/write cycles transfer size a[1:0] external data bytes required 32-bit port 16-bit port 8-bit port d[31:24] d[23:16] d[15:8] d[7:0] d[31:24] d[23:16] d[31:24] byte 00 byte 0 x x x byte 0 x byte 0 01 x byte 1 x x x byte 1 byte 1 10 x x byte 2 x byte 2 x byte 2 11 x x x byte 3 x byte 3 byte 3 word 00 byte 0 byte 1 x x byte 0 byte 1 byte 0 01 ? ? ? ? ? ? byte 1 10 x x byte2 byte 3 byte 2 byte 3 byte 2 11 ? ? ? ? ? ? byte 3 longword 00 byte 0 byte 1 byte 2 byte 3 byte 0 byte 1 byte 0 01 ? ? ? ? ? ? byte 1 10 ? ? ? ? byte 2 byte 3 byte 2 11 ? ? ? ? ? ? byte 3 line 00 byte 0 byte 1 byte 2 byte 3 byte 0 byte 1 byte 0 01 ? ? ? ? ? ? byte 1 10 ? ? ? ? byte 2 byte 3 byte 2 11 ? ? ? ? ? ? byte 3
bus operation MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 20-8 freescale semiconductor 20.6.1 interface for flash/sram devices with byte strobes csbr n [ebi] is 00 for flash/sram devices and periphera ls having 16- or 32-bit data bus widths. these memory devices have separate pins for independent byte strobes, write enable, chip select, and output enable. all chip select s support this ebi mode. the number of wait states required for the exte rnal memory or peripheral is programmed through csor n [ws]. the external transfer acknowledge signal, ta , is provided to allow of f-chip control of wait states. external control of wa it states is enabled when csor n [ws] is 0x1f. when ta is used to terminate the bus cycle, the bus cycle will ha ve a minimum of one wait states. additional wait states can be added by delaying the assertion of ta . figure 20-3. longword read; ebi = 00; 32-bit port; internal termination note wait states, if needed, are ad ded immediately after c2 in figure 20-3 . table 20-7. external bus interface codes for csbrs a0 csbr n [ebi] applicable chip select note 16-/32-bit sram/rom 00 all for 16/32 bit wide memory devices with byte strobe inputs. bs [3:0] are byte read/write enables in this mode. csbr0[ebi] = 00 at reset. sdram 01 cs7 /sdcs only one physical bank of sdram consisting of 16?256 mbit devices. the cs7 /sdcs csorn[ws] must be set to 0x1f. reserved 10 ? ? 8-bit sram/rom 11 all sram/rom timing for 8 bit wide memory devices without byte strobe inputs. bs [3:0] function as byte write enables in this mode. sdclk a[22:0] d[31:0] oe , bs [3:0] r/w csn c1 c2 (h) (h) ta
bus operation MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 20-9 figure 20-4. word write; ebi = 00; 16-/32-bit port; internal termination figure 20-5. longword read with address setup; ebi = 00; 32-bit port; internal termination sdclk a[22:0] d[31:0] oe r/w csn bs[3:2] c1 c2 bs[1:0] ta (h) (h) (h) sdclk a[22:0] d[31:0] oe , bs [3:0] r/w csn ta c1 c2 c3 (h) (h)
bus operation MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 20-10 freescale semiconductor figure 20-6. longword write with address setup; ebi = 00; 32-bit port; internal termination figure 20-7. longword read with address hold; ebi = 00; 32-bit port; internal termination sdclk a[22:0] d[31:0] oe r/w csn bs [3:0] ta c1 c2 c3 (h) (h) sdclk a[22:0] d[31:0] oe , bs [3:0] r/w csn ta c1 c2 c3 (h) (h)
bus operation MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 20-11 figure 20-8. longword write with address hold; ebi = 00; 32-bit port; internal termination figure 20-9. longword read; ebi = 00; 32-bit port; terminated by ta with one wait state sdclk a[22:0] d[31:0] oe r/w csn bs [3:0] ta c1 c2 c3 (h) (h) sdclk a[22:0] d[31:0] oe r/w csn bs [3:0] ta c1 c2 cw c3
bus operation MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 20-12 freescale semiconductor 20.6.2 interface for flash/sram devices without byte strobes csbr n [ebi] is 11 for flash/sram devices and for peri pherals having 8-bit data bus widths and no byte strobe inputs. these type of memory devices have se parate pins for write enable, chip select, and output enable. all chip select s support this ebi mode. the key difference between ebi = 11 and ebi = 00 is that bs [3:0] can be directly connected to the r/w inputs of the 8-bit wide sram devices and the r/w output from the MCF5272 can be left unconnected. the number of wait states required for the extern al memory or periphera l can be programmed in csor n [ws]. the external transfer acknowledge signal, ta , is provided to allow of f-chip control of wait states. external control of wait states is enabled when csor n [ws] is 0x1f. figure 20-10. longword read; ebi=11; 32-bit port; internal termination sdclk a[22:0] d[31:0] oe r/w csn bs [3:0] ta c1 c2 (h) (h) (h)
bus operation MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 20-13 figure 20-11. word write; ebi=11; 16/32-bit port; internal termination sdclk a[22:0] d[31:0] oe r/w csn bs[1:0] bs[3:2] c1 c2 (h) (h) (h) ta
bus operation MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 20-14 freescale semiconductor figure 20-12. read with address setup; ebi=11; 32-bit port; internal termination figure 20-13. longword write with address setup; ebi=11; 32-bit port; internal termination sdclk a[22:0] d[31:0] oe r/w csn bs [3:0] ta c1 c2 c3 (h) (h) (h) sdclk a[22:0] d[31:0] oe r/w csn bs [3:0] ta c1 c2 c3 (h) (h)
bus operation MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 20-15 figure 20-14. read with address hold; ebi=11; 32-bit port; internal termination figure 20-15. longword write with address hold ; ebi=11; 32-bit port; internal termination sdclk a[22:0] d[31:0] oe r/w csn bs [3:0] ta c1 c2 c3 (h) (h) (h) sdclk a[22:0] d[31:0] oe r/w csn bs [3:0] ta c1 c2 c3 (h) (h)
bus operation MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 20-16 freescale semiconductor figure 20-16. longword read with address setup and address hold; ebi = 11; 32-bit port, internal termination sdclk a[22:0] d[31:0] oe r/w csn bs [3:0] ta c2 c3 c1 c4 (h) (h) (h)
bus operation MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 20-17 figure 20-17. longword write with address setup and address hold; ebi = 11; 32-bit port, internal termination 20.7 burst data transfers the MCF5272 uses line read transfer s to access 16 bytes to support cache line fill ing dma transfers, and movem instructions, when appropriate . a cache line read accesses a bloc k of four longwords, aligned to a longword memory boundary, by supplyi ng a starting address that points to one of the longwords and incrementing a[3:0] of the supplied address for each transfer. a longword read accesses a single longword aligned to a longword boundary and incr ements a1 and a0 if the accessed port size is smaller than 32 bits. a word read accesses a single word of data, aligned to a word boundary a nd increments a0 if the accessed port size is smaller than 16 bits. the MCF5272 uses line write transfers to access a 16-byte operand for movem instructions and dma transfers, when appropriate. a li ne write accesses a bloc k of four longwords, aligned to a longword memory boundary, by supplying a starting address that points to one of the l ongwords and increments a[3:0] of the supplied address fo r each transfer. a longword write acce sses a single longword aligned to a longword boundary and increments a1 and a0 if the accessed port size is smaller than 32 bits. a word write accesses a single word of data, aligned to a wo rd boundary and increments a0 if the accessed port size is smaller than 16 bits. the MCF5272 hardware supports the fo llowing types of burst transfers. ? sixteen byte cache line read bursts from 32-bit wide sdram with access times of n -1-1-1. the value of n depends on read, write, page miss, page hit, etc. see chapter 9, ?sdram controller ,? sdclk a[22:0] d[31:0] oe r/w csn bs [3:0] ta c1 c2 c3 c4 (h) (h)
bus operation MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 20-18 freescale semiconductor for complete details of access time s. to enable this type of tr ansfer, csor7[extburst] must be cleared, csbr7[ebi] must be 01 , and csbr7[bw] must be 11. ? sixteen byte cache line read bur sts from 16-bit wide sdram with access time s of n-1-1-1-1-1-1-1. csor7[extburst] must be set, csbr7[eb i] must be 01, and csbr7[bw] must be 10. ? sixteen byte read or write bur sts during ethernet dma transf ers to/from sdram with access times of n-1-1-1 or n-1-1-1-1- 1-1-1 depending on 32 or 16 bit sd ram port width as described in the previous two paragraphs. all bursts to and from sram or fro m rom appear as a sequence of f our single longword accesses in the case of 32-bit wide memory. in the case of 16-bit wide sram or rom memory, a burst appears as a sequence of eight single word accesse s. in the case of 8 bit wide sram or rom memory a burst appears as a sequence of sixteen si ngle byte accesses. it is ne ver necessary to set csor n [extburst] when csor n [ebi] = 00 or 11. csbr n [bw] = 11 is invalid for sram/rom; it should be programmed with the port size. 20.8 misaligned operands all MCF5272 data formats can be located in memo ry on any byte boundary. a byte operand is properly aligned at any address; a word ope rand is misaligned at an odd address; and a longword is misaligned at an address that is not evenly divi sible by four. however, because opera nds can reside at any byte boundary, they can be misaligned. although the MCF5272 does not enforce any alignment restrictions for data operands (including program counter (pc) relative data addressing), significant pe rformance degradation can occur when additional bus cycles are required for l ongword or word operands th at are misaligned. for maxi mum performance, data items should be aligned on their natu ral boundaries. all instruction words and extension words must reside on word boundaries. an address error exception occurs wi th any attempt to prefetch an instruction word at an odd address. the MCF5272 converts misaligned operand accesse s to a sequence of aligned accesses. figure 20-18 illustrates the transfer of a longword operand from a byt e address to a 32-bit port, requiring more than one bus cycle. figure 20-19 is similar to the example illustrated in figure 20-18 except that the operand is word-sized and the transfer requires only two bus cycles. figure 20-18. example of a misaligned longword transfer figure 20-19. example of a misaligned word transfer transfer 1 transfer 2 transfer 3 ? ? byte 3 byte 0 ? ? ? byte 1 ? ? byte 2 ? 31 24 23 16 15 8 7 0 001 010 100 a[2:0] transfer 1 transfer 2 ? byte 1 ? ? ? ? byte 0 ? 31 24 23 16 15 8 7 0 001 100 a[2:0]
bus operation MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 20-19 20.9 interrupt cycles all interrupt vectors are internally generate d. the MCF5272 does not support external interrupt acknowledge cycles. the system inte gration module prioritizes all inte rrupt requests and issues the appropriate vector number in respons e to an interrupt acknowledge cycle. refer to the system integration chapter for details on the interrupt vectors and th eir priorities. when an external peripheral device re quires the services of the cpu, it can signal the coldfire core to take an interrupt exception. the extern al peripheral devices use the interrupt request signals (intx ) to signal an interrupt condition to the MCF5272. the interrupt exception transfers control to a routine that responds appropriately. there are a total of six external interrupt inputs, int [6:1]. depending on the pin configuration between three and six of these pins are available. each interrupt input pin is dedicated to an external peripheral. it is possible to have multiple ex ternal peripherals share an int x pin but software must then determine which peripheral caused the interrupt. the in terrupt priority level and the signa l level of each interrupt pin are individually programmable. the MCF5272 continuously samples the external inte rrupt input signals and synchronizes and debounces these signals. an interrupt request must be held constant for at least two consecutive clk periods to be considered a valid input. MCF5272 latches the inte rrupt and the interrupt controller responds as programmed. the interrupt service routine mu st clear the latch in the icr registers. note all internal interrupts are level sensitive only. external interrupts are edge-sensitive as programmed in the pitr. interrupts must remain stable and held valid for two cl ock cycles while they ar e internally synchronized and latched. the MCF5272 takes an interrupt exception for a pending interrupt within one in struction boundary after processing any other pending exception with a higher priority. thus, the mcf 5272 executes at least one instruction in an interrupt exception handler before recognizing another interrupt request. 20.10 bus errors the system hardware can use th e transfer error acknowledge (tea ) signal to abort the current bus cycle when a fault is detected. a bus error is recognized during a bus cycle when tea is asserted. note the signal tea is not intended for use in nor mal operation since each chip select can be programmed to automati cally terminate a bus cycle at a time defined by the bits programmed into the wait state field of the chip select option register. there is an on chip bus monitor which can be configured to generate an internal tea signal. when the MCF5272 recognizes a bus er ror condition for an access, the acce ss is terminated immediately. an access that requires more than one transfer aborts without comple ting the remaining transfers if tea is asserted, regardless of whether the access uses burst or non-burst transfers.
bus operation MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 20-20 freescale semiconductor figure 20-20 shows a longword write access to a 32-bit port with a transfer error. figure 20-20. longword write access to 32-bit port terminated with tea timing clock 1 (c1) the write cycle starts in c1. during c1, the MCF5272 places valid values on the address bus (a[22:0]) and the chip select signal. clock 2 (c2) during c2, the MCF5272 drives the data bus, the byte strobes, and r/w . clock 3 (c3) during c3, the selected device detects an error and asserts tea . at the end of c3 or cx, the MCF5272 samples the level of tea . if it is asserted, the transfer of the longword is aborted and the transfer terminates. note this example shows tea being asserted during c3. tea can be asserted earlier or later than c3. note if ta is asserted when debug tr ansfer error-acknowledge (tea ) is asserted, the transfer is terminated with a bus error. sdclk a[22:0] d[31:0] oe r/w csn tea bs [3:0] (h) c1 c2 c3 cx c4
bus operation MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 20-21 note tea normally should be asserted for no more than three clkin periods. the minimum is two clock periods. note tea is internally synchronized on the rising edge of clkin. depending on when this synchronization takes pl ace, the cx cycle may not occur. 20.11 bus arbitration the MCF5272 does not allow external bus masters. th ere are three on-chip bus masters. these are the coldfire core, the fast ethernet controller , and the memory-to-memory dma controller. 20.12 reset operation the MCF5272 supports four types of reset, two of whic h are external hardware resets (master reset and normal reset), a soft reset, which is generated by setting scr[softrst], and the software watchdog reset. there are two reset input pins, rsti and dreseten . when dreseten is asserted, any of the reset sources reset the sdram c ontroller. when dreseten is negated, the sdram controller is not reset. this is useful during software de bugging since it is preferable to re tain sdram data in the case of catastrophic system failure. in a production system, if may be preferable to tie dreseten low. master reset resets the en tire MCF5272 including the sdram controller. master reset occurs when both rsti and dreseten are asserted simultaneously. this is th e reset that should be applied to the MCF5272 device at power up. normal reset resets all of the MCF5272 with the exception of the sdram controller. normal reset occurs when rsti is asserted and dreseten is negated. normal re set allows dram refres h cycles to continue at the programmed rate and with the programmed wave form timing while the remainder of the system is being reset, maintaining th e data stored in dram. scr[softrst] resets all on-chip peri pherals and devices connected to rsto . it resets the sdram controller only when dreseten is asserted. the software watchdog reset acts as an internally generate d normal reset when dreseten is negated. it resets the sdram controller only when dreseten is asserted. note master reset must be asserted for all power-on resets. this is done by driving rsti and dreseten low simultaneously. failur e to assert master reset during power-on sequences results in unpredictable dram controller behavior.
bus operation MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 20-22 freescale semiconductor 20.12.1 master reset to perform a master reset, an external device asserts rsti and dreseten simultaneously for a minimum of six clkin cycles after vdd is within tolerance. this s hould always be done when power is initially applied. a master reset resets the entire device including the sdram controller. figure 20-21 is a functional timing diagram of the master reset operation, illustra ting relationships among vdd, rsti , dreseten , rsto , mode selects, and bus signals. clkin must be stable by the time vdd reach es the minimum operating specification. rsti and dreseten are internally synchronized on consecutive rising and falling cl ocks before being used. they must meet the specified setup and hol d times to the falling edge of cl kin only if recognition by a specific falling edge is required . figure 20-21. master reset timing when the assertion of rsti is recognized internally, the mcf 5272 asserts the reset out pin (rsto ). the rsto pin is asserted as long as rsti is asserted and remains asserted for 32,768 clkin cycles after rsti is negated. during the master reset period, all outputs are driven to their default levels. once rsto negates, all bus signals continue to remain in this state until the coldfire core begins the first bus cycle for reset exception processing. the levels of the mode select inputs, qspi_dout/wsel, qspi_c lk/busw1, and qspi_cs0/busw0, are sampled when rsto negates and they select the port size of cs0 and the physical da ta bus width after a master reset occurs. the intx signals are synchronized and are re gistered on the last falling edge of clkin where rsti is asserted. a master reset causes any bus cycle (including sdram refresh cycles) to terminate. in addition, master reset initializes registers appropriately for a re set exception. during an external master reset, scr[rstsrc] is set to 0b11 to i ndicate that assertion of rsti and dreseten caused the previous reset. vdd rsti mode select clkin rsto t >= 6 clk cycles t = 32,768 clk cycles t >= 22 clk cycles bus signals dreseten inputs
bus operation MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 20-23 20.12.2 normal reset external normal resets should be perf ormed anytime it is important to ma intain the data stored in sdram during a reset. an external no rmal reset is performed when an external device asserts rsti while negating dreseten . at power on reset both rsti and dreseten must be asserted simultaneously. if dreseten is not asserted at the same time as rsti at power up, the sdramc cannot be initialized by software. during an external normal reset, rsti must be asserted for a minimum of six clkins. figure 20-22 is a functional timing diagram of external normal rese t operation, illustrati ng relationships among rsti , dreseten , rsto , mode selects, a nd bus signals. rsti and dreseten are internally synchronized on consecutive falling and risi ng clocks before being used and must meet the specified setup and hold times to the falling edge of clkin only if reco gnition by a specific falling edge is required . figure 20-22. normal reset timing the levels of the mode select inputs, qspi_dout/wsel, qspi_c lk/busw1, qspi_cs0/busw0, and hiz are sampled when rsto negates and they sele ct the port size of cs0 and the physical data bus width after a master reset occurs. rsto is asserted as long as rsti is asserted and remains asserted for 32,768 clkin cycles after rsti is negated. for proper nor mal reset operation, dreseten must be negated as long as rsti is asserted. the levels of the mode select inputs, qspi_dout/wsel, qspi_c lk/busw1, and qspi_cs0/busw0, are sampled when rsto negates and they select the port size of cs0 and the physical da ta bus width after a master reset occurs. the intx signals are synchronized and are re gistered on the last falling edge of clkin where rsti is asserted. during the normal reset period, all outputs are driven to thei r default levels. once rsto negates, all bus signals continue to remain in this state until the coldfire core begins the first bus cycle for reset exception processing. vdd rsti mode select clkin rsto t >= 6 clk cycles t = 32,768 clk cycles t >= 22 clk cycles bus signals dreseten inputs (h)
bus operation MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 20-24 freescale semiconductor a normal reset causes all bus activity except sdram refresh cycles to te rminate. during a normal reset, sdram refresh cycles continue to occur at the programmed rate and with the programmed waveform timing. in addition, normal reset initializes registers appropriately for a reset exception. during a normal reset, scr[rstsrc] is set to 0b01 to indicate assertion of rsti with dreseten negated caused the previous reset. 20.12.3 software watchdog timer reset operation a software watchdog timer is provided to allow periodic monitoring of software activity. if the software watchdog is not periodically accessed by software it can programmed to generate a reset after a timeout period. when the timeout occurs, an inte rnal reset is asserted for 32k clocks, resetting internal registers as with a normal reset. the rsto pin simultaneously asserts for 32k clocks after the software watchdog timeout. figure 20-23 illustrates the timing of rsto when asserted by a software watchdog timeout. figure 20-23. software watchdog timer reset timing note like the normal reset, the internal reset generated by a software watchdog timeout does not reset the sd ram controller unless dreseten is low during the reset. when dreseten is high, sdram refr eshes continue to be generated during and af ter the reset at the programmed rate and with the programmed waveform timing. during the software watchdog timer re set period, all outputs are driven to their default levels. once rsto negates, all bus signals conti nue to remain in this state until the cold fire core begins the first bus cycle for reset exception processing. during a software watchdog timer rese t, sce[rstsrc] is set to 0b10 to indicate the software watchdog as the source of the previous reset. clkin rsto bus signals software internal watchdog timeout rsti t = 32k clkin cycles
bus operation MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 20-25 note the levels of the mode pins are not sampled during a software watchdog reset. if the port size and acknowledge features of cs0 are different from the values programmed in csbr0 and csor 0 at the time of the software watchdog reset, you must assert rsti during software watchdog reset to cause the mode pins to be resampled. 20.12.4 soft reset operation if the soft reset bit, scr[softrst], is programmed to generate a reset, rsto is asserted for 128 clocks, resetting all external devices as with a normal or master reset. all inte rnal peripherals with the exception of the sim, chip select, interrupt controller, gpio modu le, and sdram controller are reset also. the sdram controller is reset only when dreseten is tied low. scr[softrst] is automatically clear ed at the end of the 128 clock peri od. software can monitor this bit to determine the end of the soft reset. figure 20-24 shows the timing of rsto when asserted by scr[softrst]. figure 20-24. soft reset timing note like the normal reset, the soft reset does not reset the sdram controller unless dreseten is asserted during the reset. when dreseten is negated, sdram refreshes continue to be generate d during and after reset at the programmed rate and with the programmed waveform timing. during the soft reset period, all bus si gnals continue to operate normally. clkin rsto softrst t = 128 clk cycles internal peripherals rsti
bus operation MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 20-26 freescale semiconductor
MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 21-1 chapter 21 ieee 1149.1 test access port (jtag) this chapter describes the dedica ted user-accessible test logic im plemented on the MCF5272. this test logic complies fully with the ieee 1149.1 standard test access port and boundary scan architecture. this chapter describes those items required by the st andard and provides additi onal information specific to the MCF5272 implementation. for internal deta ils and sample applicat ions, see the ieee 1149.1 document. 21.1 overview problems with testing high-densit y circuit boards led to developm ent of this standard under the sponsorship of the test technology committee of ie ee and the joint test action group (jtag). the MCF5272 supports circuit board test st rategies based on this standard. the test logic includes a te st access port (tap) c onsisting a 16-state controller, an instruction register, and three test registers (a 1-bit bypass register, a 265-bit boundary -scan register, and a 32- bit id register). the boundary scan register links the device?s pins into one shift register. the contents of this register can be found at the coldfi re website at http://www.freescale.com . test logic, implemented using static logic design, is independent of the device system logic. the tap includes the following dedicated signals: ? tck?test clock input to s ynchronize the test logic. ? tms?test mode select i nput (with an internal pullup resistor ) that is sampled on the rising edge of tck to sequence the tap controller's state machine. ? tdi?test data input (with an internal pull-up resistor) that is sampled on the risi ng edge of tck. ? tdo?three-state test data output that is actively driven in the shift-ir and shift-dr controller states. tdo changes on the falling edge of tck. these signals, described in detail in table 21-1 , are enabled by negating the freescale test mode signal (mtmod). the MCF5272 implementation can do the following: ? perform boundary scan operations to te st circuit board el ectrical continuity ? sample MCF5272 system pins dur ing operation and transparently shift out the result in the boundary scan register ? bypass the MCF5272 for a given circuit board test by effectiv ely reducing the boundary-scan register to a single bit ? disable the output drive to pi ns during circuit-board testing ? drive output pins to stable levels
ieee 1149.1 test access port (jtag) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 21-2 freescale semiconductor note precautions to ensure that the ieee 1 149.1 test logic does not interfere with non-test operation are described in section 21.7, ?non-ieee 1149.1 operation .? figure 21-1 shows the MCF5272 implementation of ieee 1149.1. figure 21-1. test access port block diagram 21.2 jtag test access port and bdm debug port the jtag test interface shares pi ns with the debug modules (see table 21-1 ). table 21-1. jtag signals signal description tck/ pstclk test clock. tck is the dedicated jtag test logic clock input, independent of the cpu system clock. it provides a clock for on-board test logic defined by the ieee 1149.1 standard. tck should be grounded if the jtag port is not used and mtmod is tied low. tms/ bkpt test mode select. this input controls test mode o perations for on-board test lo gic defined by th e ieee 1149.1 standard. connecting tms to vdd disables the test controlle r, making all jtag circuits transparent to the system. tdo/ dso test and debug data out. output for shifting data out of seri al data port logic. shifting out data depends on the state of the jtag controller state machine and the instructions in the instruction r egister. the shift occurs on the falling edge of tck. when not outputting data, tdo is placed in high-impedance state. tdo can also be three-stated to allow bused or parallel connections to other devices having jtag test access ports. decoder 4-bit instruction register id (32 bits) boundary-scan register test data register ta p controller bypass (1 bit) tdc tdi tms tck 30
ieee 1149.1 test access port (jtag) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 21-3 21.3 tap controller the tap controller is a synchronous state machine that controls jtag logic a nd interprets the sequence of logical values on tms. the value adjacent to each arrow in the state machine in figure 21-2 reflects the value of tms sampled on the rising edge of tck. for a description of the tap controller states, refer to the ieee 1149.1 document. figure 21-2. tap controller state machine tdi/dsi test and debug data in. input provided for loading se rial data port shift registers (boundary-scan, bypass, and instruction registers). shifting in of data depends on the state of the jtag cont roller state machine and the instruction currently in the instruction register. data is shifted in on the rising edge of tck. trst / dsclk jtag test reset. trst asynchronously resets the jtag tap logic when low. mtmod freescale test mode select. negating mtmod enables jtag mode; asserting it enables bdm mode. table 21-1. jtag signals (continued) signal description
ieee 1149.1 test access port (jtag) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 21-4 freescale semiconductor 21.4 boundary scan register the boundary scan register contains b its for all device signal a nd clock pins and associ ated control signals. bidirectional pins include a single scan bit for data (io.cell) as shown in figure 21-6 . these bits are controlled by an enable cell, shown in figure 21-5 . the control bit value determines whether the bidirectional pin is an input or an output. one or more bidirectional data bits can be serially connected to a control bit as shown in figure 21-7 . note that when bidirectional data bits are sampled, bit data can be interpreted only after examining the i/o control bit to determine pin direction. open-drain bidirectional bits require separate input and output cells as no direction control is available from which to determine signal direction. programmab le open-drain signals also have an enable cell (xxx.de) to select whether the pin is open drain or push-pull. signals with pull-up or pull-down resistors have an associated enable cell (xxx.pu); one enable cell can control multiple resistors. figure 21-3 to figure 21-8 show the four MCF5272 cell types. figure 21-3. output cell (o.cell) (bc?1) mux update dr g1 1 = extest, clamp, hi-z 0 = otherwise to output buffer to next cell shift dr from last cell clock dr data from system logic 1 1 mux g1 1 1 1 d c1 1 d c1
ieee 1149.1 test access port (jtag) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 21-5 figure 21-4. input cell (i.cell). observe only (bc?4) figure 21-5. output control cell (en.cell) (bc?4) mux update dr g1 1 = extest, clamp, hi-z 0 = otherwise i/o direction to n ex t cell shift dr from last cell clock dr output control from system logic 1 1 mux g1 1 1 1 d c1 1 d c1 0 = hi-z 1 = otherwise to output buffer
ieee 1149.1 test access port (jtag) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 21-6 freescale semiconductor figure 21-6. bidirectional cell (io.cell) (bc?6) figure 21-7. general arrangement for bidirectional pins mux update dr g1 1 = extest, clamp, hi-z 0 = otherwise to next cell shift dr from last cell clock dr data from system logic 1 1 mux g1 1 1 1 d c1 1 d c1 to output buffer from input buffer 1 = output mux g1 1 1 mux g1 1 1 0 = input data to system logic
ieee 1149.1 test access port (jtag) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 21-7 21.5 instruction register the MCF5272 ieee 1149.1 implementa tion includes the three mandatory public instructions (extest, sample/preload, and bypass), the optional public id instruction, plus two additional public instructions (clamp and hi-z) defined by i eee 1149.1. the MCF5272 includes a 4-bit instruction register without parity, consisting of a shift register with four parallel outputs. data is transferred from the shift register to the parallel output s during the update-ir contro ller state. the 4 bits ar e used to decode the instructions in table 21-2 . the parallel output of the instruction register is reset to 0001 in the test -logic-reset controller state. note that this preset state is equi valent to the id instruction. table 21-2. instructions b[3:0] instruction description 0000 extest the external test (extest) instruction selects the boundary scan register. extest asserts internal reset for the MCF5272 system logic to force a predictable benign internal state while performing external boundary scan operations. by using the tap, the register is capable of a) scanni ng user-defined values into the output buffers, b) capturing values presented to input pins, c) controlling the direction of bidirectional pins, and d) controlling the output drive of thr ee-state output pins. for more de tails on the function and uses of extest, please refer to the ieee 1149. 1 document. 0001 id during the capture-ir controller state, the parallel inputs to the inst ruction shift register are loaded with the 4-bit binary value (0001). the parallel outputs, however, remain unchanged by this action since an update-ir signal is required to modify them. 0010 sample/ preload the sample/preload instruction selects the bound ary scan register and provides two separate functions. first, it provides a means to obtain a snapshot of system data and control signals. the snapshot occurs on the rising edge of tck in the capture-dr controller state. the data can be observed by shifting it transparently through the boundary scan register. because there is no internal synchronization between the ieee 1149.1 clock (tck) and the system clock (clkout), the user must provide some form of external synchronization to achieve meaningful results. the second function of sample/preload is to initia lize the boundary scan register output bits prior to selection of extest. this initialization ens ures that known data appears on the outputs when entering the extest instruction. 1001 hi-z the hi-z instruction anticipates the need to backdrive the output pi ns and protect the input pins from random toggling during circuit board testing. the hi ghz instruction selects t he bypass register, forcing all output and bidirectional pins to the high-impedance state. the hi-z instruction goes active on the falling edge of tck in the update-ir state when the data held in the instruction shift register is equivalent to octal 5. 1100 clamp when the clamp instruction is invoked, th e boundary scan multiplexer control signal extest is asserted, and the bypass register is selected. clamp sh ould be invoked after valid data has been shifted into the boundary scan register, e.g., by sample/preload. clamp allows static levels to be presented at the MCF5272 output and bidirectional pins, like extest, but without the shift latency of the boundary scan register from tdi to tdo. 1101 reserved reserved 1111 bypass the bypass instruction selects the si ngle-bit bypass register as shown in figure 21-8 . this creates a shift register path from tdi to the bypass register and, finally, to tdo, circumventing the boundary scan register. this instruction is used to enhanc e test efficiency when a component other than the MCF5272 becomes the device under test. when the bypass register is selected by the current instruction, the shift register stage is set to a l ogic zero on the rising edge of tck in the capture-dr controller state. therefore, the first bit to be shift ed out after selecting the bypass register is always a logic zero.
ieee 1149.1 test access port (jtag) MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 21-8 freescale semiconductor figure 21-8 shows the structure of the bypass register. figure 21-8. bypass register 21.6 restrictions the control afforded by the output enable signals using the boundary scan register and the extest instruction requires a compatible ci rcuit board test environment to avoi d configurations th at could damage the device. the user must avoid si tuations in which the MCF5272 output drivers are enabled into actively driven networks. overdriving the tdo driver when it is active is not recommended. 21.7 non-ieee 1149.1 operation in non-ieee 1149.1 operation, ieee 1149.1 test logic must be made transpar ent to system logic by forcing the tap controller into test-logic-r eset state, which takes at least fi ve consecutive tck rising edges with tms high. tms has an internal pull-up re sistor and may be left unconnected. if tms is unconnected or connected to v cc , the tap controller cannot exit test-logic-reset state, regardless of the tck state. this require s the tms, tck, and tdi inputs to be high.
MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 22-1 chapter 22 mechanical data this chapter contains drawings s howing the pinout and the packaging a nd mechanical characteristics of the MCF5272. 22.1 pinout figure 22-1 shows a pinout of the MCF5272. 1234567891011121314 a ddata 3 ddata 1 tea tdi / dsi d 16/ d 0 d 18/ d 2 d 21/ d 5 d 22/ d 6 bs 0 ras 0 a 13/ sda 12/ sda 11 a 2/ sda 1/ sda 0 a 3/ sda 2/ sda 1 a 4/ sda 3/ sda 2 b pst 0 ddata 2 mtmod tms / bkpt a 20 d 17/ d 1 d 20/ d 4 d 23/ d 7 sdwe sdcs / cs 7 a 12/ sda 11 a 1/ sda 0 a 5/ sda 4/ sda 3 a 6/ sda 5/ sda 4 c pst 2 pst 1 ddata 0 tck / pstclk a 21 a 18 d 19/ d 3 bs 1 cas 0 a 14/ sda 13/ sda 12 a 11/ sda 9 a 7/ sda 6/ sda 5 a 8/ sda 7/ sda 6 a 9/ sda 8/ sda 7 d pa 1/ usb _ rp pa 0/ usb _ tp pst 3 trst / dsclk tdo / dso a 19 a 17 a 16 a 15 a 0 d 14/ pc 14 a 10/ sda 9/ sda 8 sdclke a 10 _ prechg e pa 6/ usb _ rxd pa 5/ usb _ txen pa 4/ usb _ susp pa 3/ usb _ tn pa 2/ usb _ rn test gnd gnd a 22 d 15/ pc 15 d 13/ pc 13 bs 2 bs 3 sdclk f usb _ d + usb _ d - pb 5/ ta rsto vdd vdd gnd gnd vdd vdd d 12/ pc 12 d 24/ d 8 d 25/ d 9 d 26/ d 10 g usb _ vdd usb _ gnd pb 4/ urt 0 _ clk pb 6 vdd gnd gnd gnd gnd vdd d 11/ pc 11 d 27/ d 11 d 28/ d 12 d 29/ d 13 h pb 1/ urt 0 _ rxd pb 2/ urt 0_ ct s pb 3/ urt 0 _ rts pb 0/ urt 0_ txd vdd gnd gnd gnd gnd vdd d 10/ pc 10 sdba 1 d 31/ d 15 d 30/ d 14 j usb _ clk pa 8/ fsc 0/ fsr 0 pa 9/ dgnt 0 dcl 0/ urt 1_ clk vdd vdd gnd gnd vdd vdd d 7 d 8 d 9 sdba 0 k din 0/ urt 1_ rxd urt 1 _ cts / qspi _ cs 2 urt 1 _ rts / int 5 dout 0/ urt 1_ txd pa 10/ dreq 0 pwm _ out 2/ tin 1 vdd vdd cs 0 / boot cs 1 d 3/ pc 3 d 4/ pc 4 d 5/ pc 5 d 6/ pc 6 l pa 11/ qspi _ cs 1 pa 12/ dfsc 2 pa 13/ dfsc 3 fsc 1/ fsr 1/ dfsc 1 qspi _ clk / busw 1 tin 0 e _ txclk pb 10/ e _ txd 1 pb 14/ e _ rxer e _ crs cs 5 d 0/ pc 0 d 1/ pc 1 d 2/ pc 2 m dcl 1/ gdcl 1_ out pa 14/ dreq 1 pa 15 _ int 6 / dgnt 1 _ int 6 int 1 / usb _ wor qspi _ cs 0/ busw 0 pb 7/ tout 0 e _ rxdv pb 9/ e _ txd 2 pb 13/ e _ rxd 1 e _ txer cs 4 rsti bypass clkin n dout 1 din 1 int 3 qspi _ dout / wsel pwm _ out 0 e _ txd 0 e _ rxclk pb 8/ e _ txd 3 pb 12/ e _ rxd 2 e _ mdio cs 3 drese ten vdd h i z p pa 7/ qspi _ cs 3/ dout 3 din 3/ int 4 int 2 qspi _ din pwm _ out 1/ tout 1 e _ col e _ rxd 0 e _ txen pb 11/ e _ rxd 3 pb 15/ e _ mdc cs 2 cs 6 oe / rd r / w figure 22-1. MCF5272 pinout (196 mapbga)
mechanical data MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 22-2 freescale semiconductor 22.2 package dimensions figure 22-2 shows MCF5272 package dimensions. figure 22-2. 196 mapbga package dimensions (case no. 1128a-01)
MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 23-1 chapter 23 electrical characteristics this chapter describes ac and dc electrical specifications and ther mal characteristics for the MCF5272 microcontroller. because additional speeds may have become available since the publication of this book, consult freescale?s coldfire web page, http://www.freescale.com , to confirm that this is the latest information. 23.1 maximum ratings this section contains information on the maximum ratings of th e MCF5272 microcontroller. 23.1.1 supply, input voltage, and storage temperature table 23-1 lists maximum voltages and temperatures. the ratings in table 23-1 define maximum conditions to which the MCF5272 may be subjected without being damaged. however, the device cannot operate normally while exposed to these electrical extremes. this device contains circuitry that protects against damage from high stat ic voltages or electrical fields; however, normal precautions should be taken to avoid ap plication of voltages high er than maximum-rated voltages to this high-impedance circui t. reliability improves when unused inputs are tied to an appropriate logic voltage level (gnd or v dd ). table 23-1. maximum supply, input voltage and storage temperature rating symbol value unit supply voltage v dd ?0.3 to + 4.0 v maximum operating voltage v dd +3.6 v minimum operating voltage v dd +3.0 v input voltage v in ?0.5 to +5.5 v storage temperature range t stg ?55 to 150 c
electrical characteristics MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 23-2 freescale semiconductor 23.1.2 operating temperature table 23-2 lists operating temperatures. 23.1.3 resistance table 23-3 lists thermal resistance values. table 23-2. operating temperature characteristic symbol value unit standard extended maximum operating junction temperature t j 100 115 c maximum operating ambient temperature t amax 70 1 1 use this maximum operating ambient temperature only as a sy stem design guideline. all device operating parameters are guaranteed only when the junction temper ature lies within the specified range. 85 1 c minimum operating ambient temperature t amin 0-40 c table 23-3. thermal resistance characteristic symbol value unit junction to ambient, natural convection single layer board (1s) ja 51 1,2 1 ja and jt parameters are simulated in accordance with eia/j esd standard 51-2 for natural convection. freescale recommends the use of ja and power dissipation specificatio ns in the system design to preven t device junction temperatures from exceeding the rated specification. system designers s hould be aware that device junction temperatures can be significantly influenced by board layout and surrounding devices. conformance to the device junction temperature specification can be verified by physical measurement in the customer?s system using the jt parameter, the device power dissipation, and the method described in eia/jesd standard 51-2. 2 per semi g38-87 and jedec jesd51-2 with the single layer board horizontal. c/w junction to ambient, natural convection four layer board (2s2p) jma 26 1,3 3 per jedec jesd51-6 with the board horizontal. c/w junction to ambient (@200 ft/min) single layer board (1s) jma 41 1,3 c/w junction to ambient (@200 ft/min) four layer board (2s2p) jma 23 1,3 c/w junction to board jb 15 4 4 thermal resistance between the die and the printed circuit b oard per jedec jesd51-8. board temperature is measured on the top surface of the board near the package. c/w junction to case jc 10 5 5 thermal resistance between the die and the case top surface as measured by the cold plate method (mil spec-883 method 1012.1). c/w junction to top of package natural convection jt 2 1,6 6 thermal characterization parameter indica ting the temperature difference between package top and the junction temperature per jedec jesd51-2. when greek letters are not available, th e thermal characterization parameter is written as psi-jt. c/w
electrical characteristics MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 23-3 23.2 dc electrical specifications table 23-4 lists dc electrical temperatures. 23.2.1 output driver capability and loading table 23-5 lists values for drive capability and output loading. table 23-4. dc electrical specifications characteristic symbol min max unit operation voltage range v dd 3.0 3.6 v input high voltage v ih 2. 0 5.0 v input low voltage v il gnd 0.8 v input signal undershoot ? ? 0.8 v input signal overshoot ? ? 0.8 v input leakage current @ gnd, v dd clkin, d[31:0], pa[15:0], pb[15:0], tin[1:0], irq [6:1], clk, tea , pst[3:0], ddata[3:0], rsti , dreseten , tdi, tck, hiz , mtmod i in ?20 a hi-z (three-state) leakage current @gnd, v dd , a[22:0], d[31:0], oe /rd, r/w , tdo/dso i tsi ?20 ? signal low input current, v il = 0.8 v, tms/bkpt , tdi/dsi, trst /dsclk i il 01ma signal high input current, v ih = 2.0 v tms/bkpt , tdi/dsi, trst /dsclk i ih 01ma output high voltage v oh 2.4 ? v output low voltage v ol ?0.5v pin capacitance 1 1 this specification periodical ly sampled but not 100% tested. c in ?10pf table 23-5. i/o driver capability signal drive capability output load (c l) a[22:0] 6 ma 30 pf d[31:0] 6 ma 30 pf cs [6:0] 6 ma 30 pf bs 6 ma 30 pf oe /rd 4 ma 30 pf dack/hiz 4 ma 30 pf tc/bypass 4 ma 30 pf a10_prechg 10 ma 30 pf r/w 10 ma 30 pf sdba[1:0] 10 ma 30 pf ras0 10 ma 30 pf cas0 10 ma 30 pf sdclk 10 ma 30 pf
electrical characteristics MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 23-4 freescale semiconductor sdwe 10 ma 30 pf sdclke 10 ma 30 pf sdcs /cs7 10 ma 30 pf tdo/dso 4 ma 30 pf tck/pstclk 4 ma 30 pf ddata[3:0] 4 ma 30 pf pst[3:0] 4 ma 30 pf rsto 4 ma 30 pf pa[13:0] 2 ma 30 pf pa14 4 ma 30 pf pa15_int6 2 ma 30 pf pb0,pb3,pb7 4 ma 30 pf pb[2:1],pb[6:4] 2 ma 30 pf pb[10:8] 4 ma 30 pf pb[15:11] 2 ma 30 pf usb_d+ 1 ? usb_d- 1 ? dout1 2 ma 30 pf fsc1 2 ma 30 pf dcl1 4 ma 30 pf urt2_cts 2 ma 30 pf urt2_rts 2 ma 30 pf urt2_txd 2 ma 30 pf qspi_dout 4 ma 30 pf qspi_clk 4 ma 30 pf qspi_cs0 2 ma 30 pf pwm_out[3:1] 4 ma 30 pf e_txd0 4 ma 30 pf e_txen 2 ma 30 pf e_mdio 2 ma 30 pf e_txerr 2 ma 30 pf 1 requires external protection circuitry to meet usb 1.1 electrical requirements under all conditions (see 12.5.3, ?recommended usb protection circuit ?). table 23-5. i/o driver capability (continued) signal drive capability output load (c l)
electrical characteristics MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 23-5 23.3 ac electrical specifications note ac timing specifications may be subject to change during ongoing qualification. ac timing specifications assume max imum output load capacitance on all output pins including sdclk. if this va lue is different, the input and output timing specifications would need to be adjusted to match the clock load. ac timing specifications referenced to sdclk assume sdram control register bit 3 is 0. after reset this bit is set. 23.3.1 clock input and output timing specifications table 23-6 lists clock input and output timings. clock input and output timings listed in table 23-6 are shown in figure 23-1 . figure 23-1. clock input timing diagram table 23-6. clock input and output timing specifications name characteristic 0?66 mhz unit min max frequency of operation 0 66.00 mhz c1 clkin period (t) 1 1 the clock period is referred to as t in the electrical specific ations. the time for t is always in ns. timing specifications ca n be given in terms of t. for example, 2t+5 ns 15 ? ns c2 2 2 specification values are not tested. clkin fall time (from v h = 2.4 v to v l = 0.5 v) ? 2 ns c3 2 clkin rise time (from v l = 0.5 v to v h = 2.4 v) ? 2 ns c4 clkin duty cycle (measured at 1.5 v) 45 55 % c4a 3 3 specification values listed are for maximum frequency of operation. clkin pulse-width high (measured at 1.5 v) 6.75 8.25 ns c4b 3 clkin pulse-width low (measured at 1.5 v) 6.75 8.25 ns clkin c1 c4a c4b c3 c2 v h v l (input)
electrical characteristics MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 23-6 freescale semiconductor 23.3.2 processor bus input timing specifications table 23-7 lists processor bus input timings. note all processor bus timings are synchr onous; that is, input setup/hold and output delay with respect to the ri sing edge of a reference clock. the reference clock is the sdclk output. all other timing relationships ca n be derived fro m these values. table 23-7. processor bus input timing specifications name characteristic 1 1 all timing references to sdclk are given to its rising edge when bit 3 of the sdram control register is 0. 0?66 mhz unit min max control inputs b1a 2 2 rsti , ta , tea , and int x are synchronized internally. the setup time must be met only if recognition is needed on a particular clock edge. rsti valid to sdclk (setup) 6.5 ? ns b1b 2 ta valid to sdclk (setup) 8?ns b1c 2 tea valid to sdclk (setup) 8 ? ns b1d 2 int x valid to sdclk (setup) 8 ? ns b1e 2 bkpt valid to pstclk (setup) 10 ? ns b1f mode selects (busw[1:0], wsel, hiz ) valid to sdclk (setup) (when rsti asserted) 8 ? ns b2d sdclk to asynchronous control inputs (rsti , ta , tea , int x) invalid (hold) 2 ? ns b2e sdclk to mode selects (busw[1,0], wsel, hiz ) invalid (hold) (when rsti asserted) 2 ? ns b2f pstclk to asynchronous control input bkpt invalid (hold) 0 ? ns b3 rsti width low 10t ? ns data inputs b4 data input (d[31:0]) valid to sdclk (setup) 14 ? ns b5 sdclk to data input (d[31:0]) invalid (hold) 0 ? ns
electrical characteristics MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 23-7 timings listed in table 23-7 are shown in figure 23-2 . figure 23-2. general input timing requirements invalid invalid sdclk output t setup t hold input setup and hold 1.5v t rise = 1.5 ns v h = v ih v l = v il 1.5v 1.5v valid t fall = 1.5 ns v h = v ih v l = v il input rise time input fall time * the timings are also valid for inputs sampled on the negative clock edge. inputs sdclk b4 b5
electrical characteristics MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 23-8 freescale semiconductor 23.3.3 processor bus output timing specifications table 23-8 lists processor bus output timings. note above 48 mhz, the memory bus may need to be configured for one wait state. it is the responsibility of the us er to determine the actual frequency at which to insert a wait state since this depends on the access time of sram or sdram used in a particular system implementation. wait states are inserted for sram accesses by programmi ng bits 6?2 of the chip select option registers. a wait state is added for sdram re ad accesses by setting bit 4 of the sdram control register. table 23-8. processor bus output timing specifications name characteristic 1 1 all timing references to sdclk are given to its rising edge when bit 3 of the sdram control register is 0. 0?66 mhz unit min max control outputs b6a sdclk to chip selects (cs [6:0]) valid ? 12 ns b6b sdclk to byte enables (bs [3:0]) valid ? 9.5 ns b6c sdclk to output enable (oe ) valid ? 9.0 ns b6d sdclk to write enable (r/w ) valid ? 8 ns b6e sdclk to reset output (rsto ) valid ? 13.5 ns b7a sdclk to control output (cs [6:0], oe ) invalid (output hold) 1.5 ? ns b7b sdclk to control output (bs [3:0], r/w ) invalid (output hold) 1.0 ? ns b7c sdclk to reset output (rsto ) invalid (output hold) 4 ? ns address and attribute outputs b8 sdclk to address (a[22:0]) valid ? 13.0 ns b9 sdclk to address (a[22:0]) invalid (output hold) 1.5 ? ns data outputs b11 sdclk to data output (d[31:0]) valid ? 11 ns b12 2 2 data output is held valid for one cpu clock period after deassertion of bs[3:0] sdclk to data output (d[31: 0]) invalid (output hold) 1 ? ns b13 sdclk to data output (d[31:0]) high impedance ? 6 ns
electrical characteristics MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 23-9 read/write sram bus timings listed in table 23-8 are shown in figure 23-3 , figure 23-4 , figure 23-5 , and figure 23-6 . figure 23-3. read/write sram bus timing sdclk csn a[22:0] oe r/w bs [3:0] d[31:0] ta (h) (h) s0 s2 s4 s5 s1 s3 s0 s1 s2 s3 s4 s5 s0 s1 s2 tea (h) b6a b8 b7a b9 b6c b7a b6b b7b b4 b5 b11 b12 b6d b7b b7a b6a b9 b8 b6b b7b b13
electrical characteristics MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 23-10 freescale semiconductor figure 23-4 shows an sram bus cycle terminated by ta showing timings listed in table 23-8 . figure 23-4. sram bus cycle terminated by ta sdclk csn a[22:0] oe r/w bs [3:0] ta (h) s0 s2 s4 s5 s1 s3 sw0 sw1 s0 s1 tea (h) b6a b8 b7a b9 b6c b7a b6b b7b b2d b1b d[31:0] b4 b5
electrical characteristics MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 23-11 figure 23-5 shows an sram bus cycle terminated by tea showing timings listed in table 23-8 . figure 23-5. sram bus cycle terminated by tea sdclk csn a[22:0] oe r/w bs [3:0] d[31:0] ta (h) s0 s2 s4 s5 s1 s3 sw0 sw1 s0 s1 tea (h) b6a b8 b7a b9 b6c b7a b6b b7b b2d b1c
electrical characteristics MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 23-12 freescale semiconductor figure 23-6 shows reset and mode select/hiz configur ation timing showing parameters listed in table 23-8 . figure 23-6. reset and mode select/hiz configuration timing rsti mode selects sdclk (busw[1,0], wsel,hiz ) b3 b1f b2e reset is asynchronous. assert for at least 2 consecutive sdclk rising edges
electrical characteristics MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 23-13 23.4 debug ac timing specifications table 23-9 lists specifications for the debug ac timing parameters shown in figure 23-8 . figure 23-7 shows real-time trace timing for the values in table 23-9 . figure 23-7. real-time trace ac timing figure 23-8 shows bdm serial port ac timing for the values in table 23-9 . figure 23-8. bdm serial port ac timing table 23-9. debug ac timing specification num characteristic 0-66 mhz units min max d1 pst[3:0], ddata[3:0] to pstclk valid ? 8.5 ns d2 pstclk to pst[3:0], ddata[3:0] hold 1 ? ns d3 dsi-to-dsclk setup 1 ? pstclks d4 1 1 dsclk and dsi are synchronized internally. d4 is measured fr om the synchronized dsclk input relative to the rising edge of pstclk. dsclk-to-dso hold 4 ? pstclks d5 dsclk cycle time 5 ? pstclks pstclk pst[3:0], ddata[3:0] d2 d1 dsi dso current next pstclk past current dsclk d3 d4 d5
electrical characteristics MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 23-14 freescale semiconductor 23.5 sdram interface timing specifications table 23-10 lists sdram interface timings. figure 23-9 shows sdram timings listed in table 23-10 . note above 48 mhz, the memory bus may need to be configured for one wait state. it is the responsibility of the us er to determine the actual frequency at which to insert a wait state since this depends on the access time of sram or sdram used in a particular system implementation. wait states are inserted for sram accesses by programmi ng bits 6?2 of the chip select option registers. a wait state is added for sdram re ad accesses by setting bit 4 of the sdram control register. table 23-10. sdram interface timing specifications name characteristic 1 1 all timing references to sdclk are given to its rising edge when bit 3 of the sdram control register is 0. 0?66 mhz unit min max control inputs sd1 sdclk to address output a[22:0] valid ? 13.0 ns sd2 sdclk to address output a[22:0] invalid (output hold) 1 ? sd3 sdclk to dqm [3:0] valid ? 9 ns sd4 sdclk to dqm [3:0] invalid (output hold) 1.0 ? sd5 sdclk to data output (d[31:0]) valid (sig nal from driven or three-state) ? 13.0 ns sd6 sdclk to data output (d[31:0]) invalid (output hold) 1 ? sd7 sdclk to cas0 , ras0 , sdba[1:0], sdclke , sdramwe , valid ? 7 ns sd8 sdclk to cas0 , ras0 , sdba[1:0], sdclke , sdramwe , invalid (output hold) 1 ? sd9 sdclk to sdcs valid ? 8 ns sd10 sdclk to sdcs invalid (output hold) 1.0 ? sd11 sdclk to a10_prechg valid ? 9.5 sd12 sdclk to a10_prechg invalid (output hold) 1.0 ? sd13 sdclk to data output (d[31:0]) high impedance ? 6 ns sd14 data input (d[31:0]) valid to sdclk (setup ) (pipeline mode, sdram control register b4 = 1) 5.5 ? ns sd15 data input (d[31:0]) valid to sdclk (s etup) (straight-through mode, sdram control register b4 = 0) 13.0 ? ns sd16 sdclk to data input (d[31:0]) invalid (hold) 0 ? ns
electrical characteristics MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 23-15 figure 23-9. sdram signal timing sdclk data in (read sdcr data out (write) sd1 ras0 cas0 sdadr[13:0] dqmx sd3 sd5 sd6 sd16 sd14 sd8 sd7 sd7 sd8 sdwe sd8 sd7 sdba[1:0] sd7 sd4 data in sd16 sd15 (read sdcr (b4=0)) (b4=1)) a10_prechg sd12 sd11 t0 t1 t2 t3 t4 t5 t6 col col col col sdcs sd10 sd9 sd2 sd8 sdclke sd8 sd7 sd13
electrical characteristics MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 23-16 freescale semiconductor figure 23-10 shows sdram self-refresh timings listed in table 23-10 . figure 23-10. sdram self-refresh cycle timing sdclk ras0 cas0 sd w e sd7 sd8 sd8 sd7 sd7
electrical characteristics MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 23-17 23.6 fast ethernet ac timing specifications mii signals use ttl signal levels compatible with devices operating at either 5.0 v or 3.3 v. 23.6.1 mii receive signal timing (e_rxd[3:0], e_rxdv, e_rxer, and e_rxclk) the receiver functions correctly up to a e_rxclk maximum frequency of 25 mhz +1%. there is no minimum frequency requirement. in addition, the pr ocessor clock frequency must exceed twice the e_rxclk frequency. table 23-11 lists mii receive channel timings. figure 23-11 shows mii receive sign al timings listed in table 23-11 . figure 23-11. mii receiv e signal timing diagram table 23-11. mii receive signal timing num characteristic 1 1 e_rxdv, e_rxclk, and e_rxd0 have same timing in 10 mbit 7-wire interface mode. min max unit m1 e_rxd[3:0], e_rxdv, rx_err to e_rxclk setup 5 ? ns m2 e_rxclk to e_rxd[3:0], e_rxdv, rx_err hold 5 ? ns m3 e_rxclk pulse-width high 35% 65% e_rxclk period m4 e_rxclk pulse-width low 35% 65% e_rxclk period m1 m2 e_rxclk (input) e_rxd[3:0] (inputs) e_rxdv e_rxer m3 m4
electrical characteristics MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 23-18 freescale semiconductor 23.6.2 mii transmit signal timing (e_txd[3:0], e_txen, e_txer, e_txclk) table 23-12 lists mii transmit channel timings. the transmitter functions correctly up to a e_tx clk maximum frequency of 25 mhz +1%. there is no minimum frequency requirement. in addition, the pr ocessor clock frequency must exceed twice the e_txclk frequency. the transmit outputs (e_txd[3:0], e_txen, e_txer) ca n be programmed to transition from either the rising or falling edge of e_txclk, a nd the timing is the same in either case. this options allows the use of non-compliant mii phys. refer to the ethernet chapter for detail s of this option and how to enable it. figure 23-12 shows mii transmit signal timings listed in table 23-12 . figure 23-12. mii transmit signal timing diagram table 23-12. mii transmit signal timing num characteristic 1 1 e_txclk, etxd0, and e_txen have the same timing in 10 mbit 7-wire interface mode. min max unit m5 e_txclk to e_txd[3:0], e_ txen, e_txer invalid 5 ? ns m6 e_txclk to e_txd[3:0], e_txen, e_txer valid ? 25 ns m7 e_txclk pulse-width high 35% 65% e_txclk period m8 e_txclk pulse-width low 35% 65% e_txclk period m6 e_txclk (input) e_txd[3:0] (outputs) e_txen e_txer m5 m7 m8
electrical characteristics MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 23-19 23.6.3 mii async inputs sign al timing (crs and col) table 23-13 lists mii asynchronous inputs signal timing. figure 23-13 shows mii asynchronous input timings listed in table 23-13 . figure 23-13. mii async inputs timing diagram table 23-13. mii async inputs signal timing num characteristic min max unit m9 1 1 e_col has the same timing in 10 mbit 7-wire interface mode. e_crs, e_col minimum pulse width 1.5 ? e_txclk period e_crs, e_col m9
electrical characteristics MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 23-20 freescale semiconductor 23.6.4 mii serial management channel timing (mdio and mdc) table 23-14 lists mii serial management channel timings. the fec functi ons correctly with a maximum mdc frequency of 2.5 mhz. figure 23-14 shows mii serial management channel timings listed in table 23-14 . figure 23-14. mii serial management channel timing diagram table 23-14. mii serial management channel timing num characteristic min max unit m10 mdc falling edge to mdio output invalid (minimum propagation delay) 0 ? ns m11 mdc falling edge to mdio output valid (max prop delay) ? 25 ns m12 mdio (input) to mdc rising edge setup 10 ? ns m13 mdio (input) to mdc rising edge hold 0 ? ns m14 mdc pulse-width high 40% 60% mdc period m15 mdc pulse-width low 40% 60% mdc period m11 mdc (output) mdio (output) m12 m13 mdio (input) m10 m14 m15
electrical characteristics MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 23-21 23.7 timer module ac timing specifications table 23-15 lists timer module ac timings. figure 23-15 shows timer module timings listed in table 23-15 . figure 23-15. timer timing table 23-15. timer module ac timing specifications name characteristic 1 1 all timing references to sdclk are given to its rising edge when bit 3 of the sdram control register is 0. 0?66 mhz unit min max t1 tin1 cycle time 3t ? ns t2 tin1 valid to sdclk (setup) 6 ? ns t3 sdclk to tin[1:0] invalid (hold) 0 ? ns t4 tin1 pulse width 1t ? ns sdclk tin1 in tin1 in t2 t3 t1 t4 t2 t3 t2 (capture mode synchronization) (clock mode)
electrical characteristics MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 23-22 freescale semiconductor 23.8 uart modules ac timing specifications table 23-16 lists uart ac timings. figure 23-16 shows uart module timings listed in table 23-16 . figure 23-16. uart timing table 23-16. uart modules ac timing specifications name characteristic 1 1 all timing references to sdclk are given to its rising edge when bit 3 of the sdram control register is 0. 0?66 mhz unit min max ut1 urt n rxd valid to sdclk (setup) 6 ? ns ut2 sdclk to urt n_ rxd invalid (hold) 0 ? ns ut3 urt n_ cts valid to sdclk (setup) 6 ? ns ut4 sdclk to urt n_ cts invalid (hold) 0 ? ns ut5 sdclk to urt n_ txd valid ? 7 ns ut6 sdclk to urt n_ txd invalid (output hold) 3 ? ns ut7 sdclk to urt n_ rts valid ? 7 ns ut8 sdclk to urt n_ rts invalid (output hold) 3 ? ns ut5 sdclk urt n_ txd ut6 ut1 ut2 urt n_ rxd ut7 urt n_ rts ut8 ut3 ut4 urt n_ cts
electrical characteristics MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 23-23 23.9 plic module: idl and gci interface timing specifications table 23-17 shows timing for idl master mode, plic ports 1, 2, and 3. figure 23-17 shows idl master timings listed in table 23-17 . figure 23-17. idl master timing table 23-17. idl master mode timing, plic ports 1, 2, and 3 name characteristic min typ max unit p1 1, 2 1 for most telecommunications applications the period should be set to 125 s. refer to clock generator planning in plic chapter. 2 same as dcl0 and fsc0 if internal clock generator configured for pass-through mode. dfsc[1:3] period 125 s p2 delay from rising edge of gdcl1_out to rising edge of dfsc[3:1] ? ? 20 ns p3 delay from rising edge of gdcl1_out to dfsc[3:1] invalid (output hold 2 ? ? ns p4 3, 2 3 gdcl1_out must be less than 1/20th of the cpu operating frequen cy. this is to ensure minimum jitter to codecs that may be connected to ports 1,2,3. gdcl1_out clock period 20t ? ? p5 4, 2 4 based on generated gdcl1_out less than 1/20 of cpu clock frequency. gdcl1_out pulse-width high 45 50 55 % of period p6 4, 2 gdcl1_out pulse-width low 45 50 55 % of period p7 delay from rising edge of gdcl1_out to low-z and valid data on dout[1,3] ? ? 30 ns p8 delay from rising edge of gdcl1_out to dout[3:1] invalid (output hold) 2 ? ? ns p9 delay from rising edge of gdcl1_out to high-z on dout[1,3] ? ? 30 ns p10 data valid on din[1:3] before falling edge of gdcl1_out (setup time) 25 ? ? ns p11 data valid on din[1:3] after falling edge of gdcl1_out (hold time) 25 ? ? ns din1, din3 dout1, dout3 gdcl1_out p1 p4 p3 p5 p6 p7 p8 p9 p11 p10 p2 dfsc[3:1]
electrical characteristics MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 23-24 freescale semiconductor table 23-18 lists timing for idl slave mode. table 23-18. idl slave mode timing, plic ports 0?3 name characteristic min typ max unit p14 1 1 fsr occurs on average every 125 s. fsr0, fsr1 period ? 125 ? s p15a fsr0 or fsc0 valid before the falling edge of dcl0 (setup time) 25 ? ? ns p22 dcl clock frequency 256 ? 4096 khz p23 dcl pulse-width high 45 ? 55 % of dcl period p24 dcl pulse-width low 45 ? 55 % of dcl period p15b fsr1 or fsc1 valid before the falling edge of dcl1 (setup time) 25 ? ? ns p16a dcl0 to fsr0 or fsc0 input invalid (hold time) 25 ? ? ns p16b dcl1 to fsr1 or fsc1 input invalid (hold time) 25 ? ? ns p17a delay from rising edge of dcl0 to low-z and valid data on dout0 ? ? 30 ns p17b delay from rising edge of dcl1 to low-z and valid data on dout1 and dout3 ? ? 30 ns p19a delay from rising edge of dcl0 to high-z on dout0 ? ? 30 ns p19b delay from rising edge of dcl1 to high-z on dout1 and dout3 ? ? 30 ns p20 2 2 in idl slave mode, dcl may be any frequency multiple of 8 khz between 256 khz and 4.096 mhz inclusive. delay from rising edge of dcl1 to dfsc2, dfsc3 invalid (output hold) 2 ? ? ns p25 data valid on din0 before falling edge of dcl0 (setup time) 25 ? ? ns p25 data valid on din1, din3 before falling edge of dcl1 (setup time) 25 ? ? ns p26 data valid on din0 after falling edge of dcl0 (hold time) 25 ? ? ns p26 data valid on din1, din3 after falling edge of dcl1 (hold time) 25 ? ? ns
electrical characteristics MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 23-25 figure 23-18 shows idl slave timings listed in table 23-18 . figure 23-18. idl slave timing table 23-19 lists timings for gci slave mode. table 23-19. gci slave mode timing, plic ports 0?3 name characteristic min max unit p30 fsc input high before the falling edge of dcl0, dcl1 (setup time) 25 ? ns p31 fsc0 input low before the rising edge of dcl0 (deassertion setup time), fsc1 input low before the rising edge of dcl1 (deassertion setup time) 25 ns p32 fsc0 input high after the falling edge of dcl0 (hold time), fsc1 input high after the falling edge of dcl1 (hold time) 25 ? ns p33 dcl0, dcl1 clock frequency ? 8192 khz p34 dcl0, dcl1 pulse-width low 45 55 % of dcl period p35 dcl0, dcl1 pulse-width high 45 55 % of dcl period p38 delay from rising edge of fsc0 to low-z and valid data on dout0 delay from rising edge of fsc1 to low-z and valid data on dout1 delay from rising edge of dfsc2 to low-z and valid data on dout1 delay from rising edge of dfsc3 to low-z and valid data on dout1, dout3 ?30 ns p39 delay from rising edge of dcl0 to data valid on dout0, delay from rising edge of dcl1 to data valid on dout1, dout3 ?30 ns p40 delay from rising edge of dcl0 to high-z on dout0, delay from rising edge of dcl1 to high-z on dout1, dout3 ?30 ns p41 data valid on din0 before rising edge of dcl0, data valid on din1 or din3 before rising edge of dcl1 25 ? ns p42 data valid on din0 after rising edge of dcl0, data valid on din1 or din3 after rising edge of dcl1 25 ? ns dfsc[2:3] dcl[0:1] fsr[0,1] p14 p14 p19 p18 p16 p15 p17 p20 p21 p22 p23 p24 p26 p25 dout[0,1,3] din[0:3]
electrical characteristics MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 23-26 freescale semiconductor figure 23-19 shows gci slave timings listed in table 23-19 . figure 23-19. gci slave mode timing table 23-20 lists timings for gci master mode. table 23-20. gci master mode timing, plic ports 1, 2, 3 name characteristic min max unit name p50 1 1 for most telecommunications applications th e period of dfsc[1:3] should be set to 125 s. refer to clock generator planning in plic chapter. delay from rising edge of gdcl1_out to rising edge of dfsc[1:3] ? ? 20 ns p51 1 delay from rising edge of gdcl1_out to falling edge of dfsc[1:3] ? ? 20 ns p52 2,3 2 gdcl1_out must be less than 1/20th of the cpu operating frequency to ensure minimum jitter to codecs connected to ports 1, 2, 3. 3 same as dcl0 and fsc0 if internal clock generator configured for pass-through mode. gdcl1_out clock period 20t ? ? ns p53 2,4 4 based on generated gdcl1_out less than 1/20 of cpu clock frequency. gdcl1_out pulse-width low 45 50 55 % of period p54 2,4 gdcl1_out pulse-width high 45 50 55 % of period p57 delay from rising edge of gdcl1_out to low-z and valid data on dout[1,3] ? ? 30 ns p58 delay from rising edge of gdcl1_out to data valid on dout[1,3] ? ? 30 ns p59 delay from rising edge of gdcl1_out to high-z on dout[1,3] ? ? 30 ns p60 data valid on din[1:3] before rising edge of gdcl1_out (setup time) 25 ? ? ns p61 data valid on din[1:3] after rising edge of gdcl1_out (hold time) 25 ? ? ns dout[0,1,3] fsc[0,1] dcl[0:1] p35 p34 p40 p39 p38 p30 p32 p31 p42 p41 p33 din[0,1,3] dfsc[2,3]
electrical characteristics MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 23-27 figure 23-20 shows gci master timings listed in table 23-20 . figure 23-20. gci master mode timing dfsc1 gdcl1_out p59 p58 p57 p50 p51 dfsc2 dout1 dout3 din1 p53 p54 p52 p61 p60 dfsc3 din3
electrical characteristics MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 23-28 freescale semiconductor 23.10 general-purpose i/o port ac timing specifications table 23-21 lists gpio port timings. figure 23-21 shows gpio timings listed in table 23-21 . figure 23-21. general-purpose i/o port timing table 23-21. general-purpose i/o port ac timing specifications name characteristic 1 1 all timing references to sdclk are given to its rising edge when bit 3 of the sdram control register is 0. 0?66 mhz unit min max g1 portx input setup time to sdclk (rising) 6 ? ns g2 portx input hold time from sdclk (rising) 0 ? ns g3 sdclk to portx output valid ? 11.5 ns g4 sdclk to portx output invalid (output hold) 1 ? ns p3 sdclk portx out p4 p1 p2 portx in
electrical characteristics MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 23-29 23.11 usb interface ac timing specifications table 23-22 lists usb interface timings. note usb signals are sampled; setup and hol d times are not nor mally required in a transceiver connection. figure 23-22 shows usb timings listed in table 23-22 . figure 23-22. usb interface timing table 23-22. usb interface ac timing specifications name characteristic 48-66 mhz unit min max us1 usb_clk frequency of operation 1 1 usb_clk accuracy should be +- 500ppm or better. usb_clk may be stopped to conserve power. 48 48 mhz us2 2 2 specification values are not tested. usb_clk fall time (from v h = 2.4v to v l = 0.5v) ? 2 ns us3 2 usb_clk rise time (from v l = 0.5v to v h = 2.4v) ? 2 ns us4 usb_clk duty cycle (measured at 1.5 v) 45 55 % us5 usb inputs (usb_rp, usb_rn, usb_rxd) setup time to usb_clk (rising) 6 ? ns us6 usb inputs (usb_rp, usb_rn, usb_rxd) hold time from usb_clk (rising) 6 ? ns us7 usb_clk to usb outputs valid (usb_ tp, usb_tn, usb_susp, usb_txen) ? 12 ns us8 usb_clk to usb outputs invalid (output hol d) (usb_tp, usb_tn, usb_susp, usb_txen) 3 ? ns usb_clk us1 us4a us4b us3 us2 v h v l (input) us7 usb_tp us8 us5 us6 usb_rp usb_rn usb_rxd usb_tn usb_susp usb_txen
electrical characteristics MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 23-30 freescale semiconductor 23.12 ieee 1149.1 (jtag) ac timing specifications table 23-23 lists jtag timings. figure 23-23 shows jtag timings listed in table 23-23 . figure 23-23. ieee 1149.1 (jtag) timing table 23-23. ieee 1149.1 (jtag) ac timing specifications name characteristic 0?66 mhz unit min max ? tck frequency of operation 0 10 mhz j1 tck cycle time 100 ? ns j2a tck clock pulse high width measured at 1.5 v 40 ? ns j2b tck clock pulse low width measured at 1.5 v 40 ? ns j3a tck fall time (from v h = 2.4 v to v l = 0.5 v) ? 5 ns j3b tck rise time (from v l = 0.5 v to v h = 2.4 v) ? 5 ns j4 tdi, tms to tck rising (setup) 10 ? ns j5 tck rising edge to tdi, tms invalid (hold) 15 ? ns j6 boundary scan data valid to tck rising edge (setup) 10 ? ns j7 boundary scan data invalid to tck rising edge (hold) 15 ? ns j8 trst pulse-width (asynchronous to clock edges) 15 ? ns j9 tck falling edge to tdo valid (signal from driven or three-state) ? 30 ns j10 tck falling edge to tdo high impedance ? 30 ns j11 tck falling edge to boundary scan data valid (signal from driven or three-state) ? 35 ns j12 tck falling edge to boundary scan data high impedance ? 35 ns tck j1 j3b j3a v h v l j2a j2b j4 j5 j6 j7 boundary j9 j10 trst tdo j8 j11 j12 tdi, tms scan data inputs boundary scan data outputs
electrical characteristics MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor 23-31 23.13 qspi electrical specifications table 23-24 lists qspi timings. the values in table 23-24 correspond to figure 23-24 . figure 23-24. qspi timing table 23-24. qspi modules ac timing specifications name characteristic 0?66 mhz unit min max qs1 qspi_cs[3:0] to qspi_clk 1t 1 1 t is defined as clock period in ns. see ta b l e 2 3 - 6 . 127t 1 ns qs2 qspi_clk high to qspi_dout valid. ? 20 ns qs3 qspi_clk high to qspi_dout invalid. (output hold) 0 ? ns qs4 qspi_din to qspi_clk (input setup) 10 ? ns qs5 qspi_din to qspi_clk (input hold) 10 ? ns qspi_cs[3:0] qspi_clk qspi_dout qs5 qs1 qspi_din qs3 qs4 qs2
electrical characteristics MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 23-32 freescale semiconductor 23.14 pwm electrical specifications table 23-25 lists pwm timings. the values in table 23-25 correspond to figure 23-25 . figure 23-25. pwm timing table 23-25. pwm modules ac timing specifications name characteristic 1 1 all timing references to sdclk are given to its rising edge when bit 3 of the sdram control register is 0. 0?66 mhz unit min max pw1 2 2 parameter tested sdlck high to pwm_out[2:0] valid, high or low. ? 11 ns pw2 2 sdlck high to pwm_out[2:0] invalid. (output hold) 2.5 ? ns pwm_out[2:0] sdclk pw1 pw2
MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor a-1 appendix a list of memory maps the MCF5272 memory map is given in this section. the addresses for the system confi guration registers are absolute a ddresses in the MCF5272 cpu space memory map. the on-chip periphera l modules are configured as a gr oup by programming the module base address register, (mbar). in the title block for each module is shown the offset address of the given regi ster from the base address programmed in mbar. the following formula allows calculation of the absolute address of a given register. absolute address = mbar + register offset a.1 list of memory map tables table a-1. on-chip module base address offsets from mbar module module base address mnemonic configuration registers mbar+0x0000 cfg_base interrupt registers mbar+0x0020 int_base chip select registers mbar+0x0040 cs_base ports registers mbar+0x0080 gpio_base qspi module register s mbar+0x00a0 qspi_base pwm module registers mbar+0x00c0 pwm_base dma module registers mbar+0x00e0 dmac_base uart0 module registers mbar+0x0100 uart0_base uart1 module registers mbar+0x0140 uart1_base sdram controller registers mbar+0x0180 sdramc_base timer module registers mbar+0x0200 timer_base plic module registers mbar+0x0300 plic_base ethernet module registers mbar+0x0800 enet_base usb module registers mbar+0x1000 usb_base
list of memory maps MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 a-2 freescale semiconductor note mbar must only be written using the movec instruction. writing to address mbar+0x0000 causes unpredictable device operation. table a-2. cpu space registers memory map cpu space address name size system configuration registers program access debug access 0x0002 (cacr) 32 cache control register movec rcreg, wcreg 0x0004 (acr0) 32 cache access control register 0 movec rcreg, wcreg 0x0005 (acr1) 32 cache access control register 1 movec rcreg, wcreg 0x008x a7:a0 32 address registers a7:a0 move rareg, wareg 0x008x d7:d0 32 data registers d7:d0 move rdreg, wdreg 0x0801 (vbr) 32 vector base register movec rcreg, wcreg 0x080e ccr 8 condition code register (deb ug only) move to/from ccr rcreg, wcreg 0x080f pc 32 program counter (debug only) rcreg, wcreg 0x0c00 rombar 32 rom base address register movec rcreg, wcreg 0x0c04 rambar 32 sram base address register movec rcreg, wcreg 0x0c0f mbar 32 module base address register movec table a-3. on-chip peripherals and configuration registers memory map mbar offset [31:24] [23:16] [15:8] [7:0] 0x0000 module base address register, read only (mbar) 0x0004 system configuration register (scr) reserved 0x0006 reserved system protection register (spr) 0x0008 power management register (pmr) 0x000e reserved activate low power register (alpr) 0x0010 device identification register (dir) table a-4. interrupt control register memory map mbar offset [31:24] [23:16] [15:8] [7:0] 0x0020 interrupt control register 1 (icr1) 0x0024 interrupt control register 2 (icr2) 0x0028 interrupt control register 3 (icr3) 0x002c interrupt control register 4 (icr4) 0x0030 interrupt source register (isr) 0x0034 programmable interrupt transition register (pitr) 0x0038 programmable interrupt wakeup register (piwr) 0x003f reserved programmable interrupt vector register (pivr)
list of memory maps MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor a-3 table a-5. chip select register memory map mbar offset [31:24] [23:16] [15:8] [7:0] 0x0040 cs base register 0 (csbr0) 0x0044 cs option register 0 (csor0) 0x0048 cs base register 1 (csbr1) 0x004c cs option register 1 (csor1) 0x0050 cs base register 2 (csbr2) 0x0054 cs option register 2 (csor2) 0x0058 cs base register 3 (csbr3) 0x005c cs option register 3 (csor3) 0x0060 cs base register 4 (csbr4) 0x0064 cs option register 4 (csor4) 0x0068 cs base register 5 (csbr5) 0x006c cs option register 5 (csor5) 0x0070 cs base register 6 (csbr6) 0x0074 cs option register 6 (csor6) 0x0078 cs base register 7 (csbr7) 0x007c cs option register 7 (csor7) table a-6. gpio port register memory map mbar offset [31:24] [23:16] [15:8] [7:0] 0x0080 port a control register (pacnt) 0x0084 port a data direction register (paddr) reserved 0x0086 reserved port a data register (padat) 0x0088 port b control register (pbcnt) 0x008c port b data direction register (pbddr) reserved 0x008e reserved port b data register (pbdat) 0x0094 port c data direction register (pcddr) reserved 0x0096 reserved port c data register (pcdat) 0x0098 port d control register (pdcnt)
list of memory maps MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 a-4 freescale semiconductor table a-7. qspi module memory map mbar offset [31:24] [23:16] [15:8] [7:0] 0x00a0 qspi mode register (qmr) reserved 0x00a4 qspi delay register (qdlyr) reserved 0x00a8 qspi wrap register (qwr) reserved 0x00ac qspi interrupt register (qir) reserved 0x00b0 qspi address register (qar) reserved 0x00b4 qspi data register (qdr) reserved table a-8. pwm module memory map mbar offset [31:24] [23:16] [15:8] [7:0] 0x00c0 pwm control register 1 (pwcr1) reserved 0x00c4 pwm control register 2 (pwcr2) reserved 0x00c8 pwm control register 3 (pwcr3) reserved 0x00d0 pwm pulse-width register 1 (pwwd1) reserved 0x00d4 pwm pulse-width register 2 (pwwd2) reserved 0x00d8 pwm pulse-width register 3 (pwwd3) reserved table a-9. dma module memory map mbar offset [31:24] [23:16] [15:8] [7:0] 0x00e0 dma mode register (dcmr) 0x00e6 dma interrupt register (dcir) 0x00e8 dma byte count register (dbcr) 0x00ec dma source address register (dsar) 0x00f0 dma destination address register (ddar)
list of memory maps MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor a-5 table a-10. uart0 module memory map mbar offset [31:24] [23:16] [15:8] [7:0] 0x0100 uart0 mode register 1/2 (u0mr1/u0mr2) reserved 0x0104 uart0 status (u0sr) reserved 0x0104 uart0 clock select register (u0csr) reserved 0x0108 uart0 command register (u0cr) reserved 0x010c uart0 receive buffer (u0rxb) reserved 0x010c uart0 transmit buffer (u0txb) reserved 0x0110 uart0 cts change register (u0ccr) reserved 0x0110 uart0 auxiliary control register (u0acr) reserved 0x0114 uart0 interrupt status register (u0isr) reserved 0x0114 uart0 interrupt mask register (u0imr) reserved 0x0118 uart0 baud prescaler msb (u0bg1) reserved 0x011c uart0 baud prescaler lsb (u0bg2) reserved 0x0120 uart0 autobaud msb register (u0abr1) reserved 0x0124 uart0 autobaud lsb register (u0abr2) reserved 0x0128 uart0 txfifo control/status register (u0txfcsr) reserved 0x012c uart0 rxfifo control/status register (u0rxfcsr) reserved 0x130 uart0 fractional precision divider control registers (ufpdn) reserved 0x0134 uart0 cts unlatched input (u0ip) reserved 0x0138 uart0 rts o/p bit set command register (u0op1) reserved 0x013c uart0 rts o/p bit reset command register (u0op0) reserved
list of memory maps MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 a-6 freescale semiconductor table a-11. uart1 module memory map mbar offset [31:24] [23:16] [15:8] [7:0] 0x0140 uart1 mode register 1/2 (u1mr1/u1mr2) reserved 0x0144 uart1 status (u1sr) reserved 0x0144 uart1 clock select register (u1csr) reserved 0x0148 uart1 command register (u1cr) reserved 0x014c uart1 receive buffer (u1rxb) reserved 0x014c uart1 transmit buffer (u1txb) reserved 0x0150 uart1 cts change register (u1ccr) reserved 0x0150 uart1 auxiliary control register (u1acr) reserved 0x0154 uart1 interrupt status register (u1isr) reserved 0x0154 uart1 interrupt mask register (u1imr) reserved 0x0158 uart1 baud prescaler msb (u1bg1) reserved 0x015c uart1 baud prescaler lsb (u1bg2) reserved 0x0160 uart1 autobaud msb register (u1abr1) reserved 0x0164 uart1 autobaud lsb register (u1abr2) reserved 0x0168 uart1 txfifo control/status register (u1txfcsr) reserved 0x016c uart1 rxfifo control/status register (u1rxfcsr) reserved 0x170 uart1 fractional precision divider control registers (ufpdn) reserved 0x0174 uart1 cts unlatched input (u1ip) reserved 0x0178 uart1 rts o/p bit set command register (u1op1) reserved 0x017c uart1 rts o/p bit reset command register (u1op0) reserved
list of memory maps MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor a-7 table a-12. sdram controller memory map mbar offset [31:24] [23:16] [15:8] [7:0] 0x0180 reserved sdram configuration register (sdcr) 0x0184 reserved sdram timing register (sdtr) table a-13. timer module memory map mbar offset [31:24] [23:16] [15:8] [7:0] 0x0200 timer 0 mode register (tmr0) reserved 0x0204 timer 0 reference register (trr0) reserved 0x0208 timer 0 capture register (tcap0) reserved 0x020c timer 0 counter register (tcn0) reserved 0x0210 timer 0 event register (ter0) reserved 0x0220 timer 1 mode register (tmr1) reserved 0x0224 timer 1 reference register (trr1) reserved 0x0228 timer 1 capture register (tcap1) reserved 0x022c timer 1 counter register (tcn1) reserved 0x0230 timer 1 event register (ter1) reserved 0x0240 timer 2 mode register (tmr2) reserved 0x0244 timer 2 reference register (trr2) reserved 0x0248 timer 2 capture register (tcap2) reserved 0x024c timer 2 counter register (tcn2) reserved 0x0250 timer 2 event register (ter2) reserved 0x0260 timer 3 mode register (tmr3) reserved 0x0264 timer 3 reference register (trr3) reserved 0x0268 timer 3 capture register (tcap3) reserved 0x026c timer 3 counter register (tcn3) reserved 0x0270 timer 3 event register (ter3) reserved 0x0280 watchdog reset reference register (wrrr) reserved 0x0284 watchdog interrupt reference register (wirr) reserved 0x0288 watchdog counter register (wcr) reserved 0x028c watchdog event register (wer) reserved
list of memory maps MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 a-8 freescale semiconductor table a-14. plic module memory map mbar offset [31:24] [23:16] [15:8] [7:0] 0x0300 port0 b1 data receive (p0b1rr) 0x0304 port1 b1 data receive (p1b1rr) 0x0308 port2 b1 data receive (p2b1rr) 0x030c port3 b1 data receive (p3b1rr) 0x0310 port0 b2 data receive (p0b2rr) 0x0314 port1 b2 data receive (p1b2rr) 0x0318 port2 b2 data receive (p2b2rr) 0x031c port3 b2 data receive (p3b2rr) 0x0320 port 0 d data receive (p0drr) port 1 d data receive (p1drr) port 2 d data receive (p2drr) port 3 d data receive (p3drr) 0x0328 port0 b1 data transmit (p0b1tr) 0x032c port1 b1 data transmit (p1b1tr) 0x0330 port2 b1 data transmit (p2b1tr) 0x0334 port3 b1 data transmit (p3b1tr) 0x0338 port0 b2 data transmit (p0b2tr) 0x033c port1 b2 data transmit (p1b2tr) 0x0340 port2 b2 data transmit (p2b2tr) 0x0344 port3 b2 data transmit (p3b2tr) 0x0348 port 0 d data transmit (p0dtr) port 1 d data transmit (p1dtr) port 2 d data transmit (p2dtr) port 3 d data transmit (p3dtr) 0x0350 port0 gci/idl configuration register (p0 cr) port1 gci/idl configuration register (p1cr) 0x0354 port2 gci/idl configuration register (p2 cr) port3 gci/idl configuration register (p3cr) 0x0358 port0 interrupt configuration register (p0i cr) port1 interrupt configuration register (p1icr) 0x035c port2 interrupt configuration register (p2i cr) port3 interrupt configuration register (p3icr) 0x0360 port0 gci monitor rx (p0gmr) port1 gci monitor rx (p1gmr) 0x0364 port2 gci monitor rx (p2gmr) port3 gci monitor rx (p3gmr) 0x0368 port0 gci monitor tx (p0gmt) port1 gci monitor tx (p1gmt) 0x036c port2 gci monitor tx (p2gmt) port3 gci monitor tx (p3gmt) 0x0370 reserved gci monitor tx status (pgmts) gci monitor tx abort (pgmta) reserved 0x0374 port0 gci c/i rx (p0gcir) port1 gci c/i rx (p1gci r) port2 gci c/i rx (p2gcir) port3 gci c/i rx (p3gcir) 0x0378 port0 gci c/i tx (p0gcit) port1 gci c/i tx (p1gci t) port2 gci c/i tx (p2gcit) port3 gci c/i tx (p3gcit) 0x037c reserved gci c/i tx status (pgcitsr) 0x0383 reserved gci d-channel status (pdcsr) 0x0384 port0 periodic status (p0psr) port1 periodic status (p1psr) 0x0388 port2 periodic status (p2psr) port3 periodic status (p3psr)
list of memory maps MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor a-9 0x038c aperiodic interrupt status register (pasr) reserved loop back control (plcr) 0x0392 reserved d channel request (pdrqr) 0x0394 port0 sync delay (p0sdr) port1 sync delay (p1sdr) 0x0398 port2 sync delay (p2sdr) port3 sync delay (p3sdr) 0x039c reserved clock select (pcsr) table a-15. ethernet module memory map mbar offset [31:24] [23:16] [15:8] [7:0] 0x0840 ethernet control register (ecr) 0x0844 ethernet interrupt event register (eir) 0x0848 ethernet interrupt mask register (eimr) 0x084c ethernet interrupt vector status (ivsr) 0x0850 ethernet rx ring updated flag (rdar) 0x0854 ethernet tx ring updated flag (tdar) 0x0880 ethernet mii data register (mmfr) 0x0884 ethernet mii speed register (mscr) 0x08cc ethernet receive bound register (frbr) 0x08d0 ethernet rx fifo start address (frsr) 0x08e4 transmit fifo watermark (tfwr) 0x08ec ethernet tx fifo start address (tfsr) 0x0944 ethernet rx control register (rcr) 0x0948 maximum frame length register (mflr) 0x0984 ethernet tx control register (tcr) 0x0c00 ethernet address (lower) (malr) 0x0c04 ethernet address (upper) (maur) 0x0c08 ethernet hash table (upper) (htur) 0x0c0c ethernet hash table (lower) (htlr) 0x0c10 ethernet rx descriptor ring (erdsr) 0x0c14 ethernet tx descriptor rin (etdsr) 0x0c18 ethernet rx buffer size (emrbr) 0x0c40? 0x0dff fifo ram (efifo) table a-14. plic module memory map (continued) mbar offset [31:24] [23:16] [15:8] [7:0]
list of memory maps MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 a-10 freescale semiconductor table a-16. usb module memory map mbar offset [31:24] [23:16] [15:8] [7:0] 0x1002 reserved usb frame number register (fnr) 0x1006 reserved usb frame number match register (fnmr) 0x100a reserved usb real-time frame monitor register (rfmr) 0x100e reserved usb real-time frame monitor match register (rfmmr) 0x1013 reserved usb function address register (far) 0x1014 usb alternate setting register (asr) 0x1018 usb device request data1 register (drr1) 0x101c usb device request data2 register (drr2) 0x1022 reserved usb specification number register (specr) 0x1026 reserved usb endpoint 0 status register (ep0sr) 0x1028 usb endpoint 0 in config register (iep0cfg) 0x102c usb endpoint 0 out config register (oep0cfg) 0x1030 usb endpoint 1 configuration register (ep1cfg) 0x1034 usb endpoint 2 configuration register (ep2cfg) 0x1038 usb endpoint 3 configuration register (ep3cfg) 0x103c usb endpoint 4 configuration register (ep4cfg) 0x1040 usb endpoint 5 configuration register (ep5cfg) 0x1044 usb endpoint 6 configuration register (ep6cfg) 0x1048 usb endpoint 7 configuration register (ep7cfg) 0x104c usb endpoint 0 control register (ep0ctl) 0x1052 reserved usb endpoint 1 control register (ep1ctl) 0x1056 reserved usb endpoint 2 control register (ep2ctl) 0x105a reserved usb endpoint 3 control register (ep3ctl) 0x105e reserved usb endpoint 4 control register (ep4ctl) 0x1062 reserved usb endpoint 5 control register (ep5ctl) 0x1066 reserved usb endpoint 6 control register (ep6ctl) 0x106a reserved usb endpoint 7 control register (ep7ctl) 0x106c usb general/endpoint 0 interrupt status register (ep0isr) 0x1092 reserved usb endpoint 1 inte rrupt status register (ep1isr) 0x1096 reserved usb endpoint 2 inte rrupt status register (ep2isr) 0x109a reserved usb endpoint 3 inte rrupt status register (ep3isr) 0x109e reserved usb endpoint 4 inte rrupt status register (ep4isr) 0x10a2 reserved usb endpoint 5 inte rrupt status register (ep5isr) 0x10a6 reserved usb endpoint 6 inte rrupt status register (ep6isr) 0x10aa reserved usb endpoint 7 inte rrupt status register (ep7isr)
list of memory maps MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor a-11 0x108c usb endpoint 0 interrupt mask register (ep0imr) 0x1090 reserved usb endpoint 1 interrupt mask register (ep1imr) 0x1094 reserved usb endpoint 2 interrupt mask register (ep2imr) 0x1098 reserved usb endpoint 3 interrupt mask register (ep3imr) 0x109c reserved usb endpoint 4 interrupt mask register (ep4imr) 0x10a0 reserved usb endpoint 5 interrupt mask register (ep5imr) 0x10a4 reserved usb endpoint 6 interrupt mask register (ep6imr) 0x10a8 reserved usb endpoint 7 interrupt mask register (ep7imr) 0x10ac usb endpoint 0 data register (ep0dr) 0x10b0 usb endpoint 1 data register (ep1dr) 0x10b4 usb endpoint 2 data register (ep2dr) 0x10b8 usb endpoint 3 data register (ep3dr) 0x10bc usb endpoint 4 data register (ep4dr) 0x10c0 usb endpoint 5 data register (ep5dr) 0x10c4 usb endpoint 6 data register (ep6dr) 0x10c8 usb endpoint 7 data register (ep7dr) 0x10ce reserved usb endpoint 0 data present register (ep0dpr) 0x10d2 reserved usb endpoint 1 data present register (ep1dpr) 0x10d6 reserved usb endpoint 2 data present register (ep2dpr) 0x10da reserved usb endpoint 3 data present register (ep3dpr) 0x10de reserved usb endpoint 4 data present register (ep4dpr) 0x10e2 reserved usb endpoint 5 data present register (ep5dpr) 0x10e6 reserved usb endpoint 6 data present register (ep6dpr) 0x10ea reserved usb endpoint 7 data present register (ep7dpr) 0x1400 ? 0x17ff usb configuration ram, 1 k bytes table a-16. usb module memory map (continued) mbar offset [31:24] [23:16] [15:8] [7:0]
list of memory maps MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 a-12 freescale semiconductor
MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor b-1 appendix b buffering and impedance matching when required: ? sdram and a large number of external periphe rals are required for a particular system configuration. ? some peripherals may have excessive input capacitance. ? minimize signal reflecti ons at higher clock speeds. ? minimize capacitive loading on signals to sdrams. ? operation of MCF5272 at highest frequencies, i.e. 66mhz, requ ires clean signals to ensure setup and hold times are met and to minimize emc noise in terms of ove rshoot and undershoot of signals. what to do: ? add buffers on address and control signals shared by sdram and other peripherals. ? never put buffers between the MCF5272 device and the sdrams. ? put termination resistors as close as possible to outputs. ? or use buffers that have in tegral termination resistors.
buffering and impedance matching MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 b-2 freescale semiconductor figure b-1. buffering and termination r4 r1 r1 r1 r1 ra1 ra2 r2 ra5 ra3 ra4 ra6 ra7 ra8 ra9 ra10 ra3 sdram flash d31:d0 device d31:d0 #1 device d31:d0 #2 device d31:d0 #3 cs0cs1cs2cs3 32 oe cs0 cs1 cs2 cs3 d31:d0 signals m cf5272 cs7 32 n dir en b[7:0] a[7:0] 74lvc245 signal = bs[3:0] = ax:a2 (32 bit bus) = ax:a1 (16 bit bus) ra1, ra2, ra3, ... r1, r2, ... = resistor arrays 10-75 ohms = resistor 10-75 ohms
MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor index-1 index a access control register, 4-14 acr0 and acr1, 4-14 activate low-power register, 6-10 address bus, 20-2 address variant, 5-4 addressing mode summary, 2-12 addressing mode summary, 2-12 arbitration, bus, 20-21 architecture overview, 1-4 async inputs signal timing, 23-19 audience, 1-xl b baud rate calculating, 16-20 selection, 14-6 branch instruction execution timing, 2-25 buffer descriptors ethernet, 11-34 usb controller, 11-34 buffering and impedance matching, b-1 bus arbitration, 20-21 burst data transfers, 20-17 configurations overview, 1-7 data transfer mechanism, 20-4 errors, 20-19 exceptions, 20-3 external interface, 1-5 external interface types, 20-7 interface for flash/sram, 20-8 interrupt acknowledge cycles, 20-19 master reset, 20-22 misaligned operands, 20-18 normal reset, 20-23 read/write (r/w ), 20-2 reset operation, 20-21 sizing, 20-4 soft reset operation, 20-25 software watchdog timer reset operation, 20-24 transfer acknowledge (ta ), 20-2 transfer error acknowledge (tea ), 20-3 byte strobes, 20-8 c cache configuration register, 2-9 registers, access control, 2-9 cache control register, 4-12 caches coherency and validation, 4-8 miss fetch algorithm/line fills, 4-10 cam interface, 11-6 ccr, 2-6 chip select base registers, 8-3 cs0 special case, 8-2 option registers, 8-5 overview, features, usage, 8-1 registers, 8-2 chip selects general overview, 1-5 clock generator, usb, 12-4 coldfire documentation, 1-xliii coldfire core addressing mode summary, 2-12 condition code register (ccr), 2-6 exception processing overview, 2-25 features and enhancements, 2-1 instruction set summary, 2-13 integer data formats, 2-9 programming model, 2-4 status register, 2-8 supervisor programming model, 2-7 user programming mode, 2-4 condition code register, 2-6 conventions notational, 1-xliv terminology, 1-xlvii core version 2 overview, 1-4 d data bus, 20-2 debug attribute trigger register, 5-7 bdm command set summary, 5-19
index MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 index-2 freescale semiconductor breakpoint operation, 5-34 module enhancements, 2-4 real-time support, 5-33 taken branch, 5-4 theory, 5-34 device identification register, 6-11 dma address modes, 10-2 byte count register, 10-6 controller registers, 10-2 data transfer types, 10-1 destination address register, 10-6 interrupt register, 10-4 mode register, 10-2 source address register, 10-5 documentation, 1-xliii dsclk, 5-2 e electrical specifications ac, 23-5 ac timing debug, 23-13 fast ethernet, 23-17 gpio port, 23-28 ieee 1149.1 (jtag), 23-30 usb interface, 23-29 clock input and output timing, 23-5 dc, 23-3 dl and gci interface timing, 23-23 maximum ratings, 23-1 mii async inputs signal timing, 23-19 operating temperature, 23-2 output loading, 23-3 processor bus input timing, 23-6 qspi, 23-31 , 23-32 sdram interface timing, 23-14 supply, input voltage, and storage temperature, 23-1 thermal resistance, 23-2 timer module ac timing, 23-21 usart module ac timing, 23-22 ethernet address recognition, 11-6 buffer descriptors receive, 11-35 transmit, 11-37 cam interface, 11-6 collision handling, 11-8 control register, 11-11 descriptor active register, 11-15 descriptor ring register pointer-to-receive, 11-30 pointer-to-transmit, 11-31 error handling, 11-9 fec initialization, 11-34 fifo receive bound register, 11-19 receive start register, 11-20 transmit start register, 11-22 frame reception, 11-5 transmission, 11-4 hardware initialization, 11-33 hash table algorithm, 11-8 high register, 11-28 low register, 11-29 initialization sequence, 11-33 internal and external loopback, 11-8 interpacket gap time, 11-8 interrupt event register, 11-12 mask register, 11-13 vector status register, 11-14 loopbacks, 11-8 maximum frame length register, 11-24 mii management frame register, 11-17 speed control register, 11-18 module operation, 11-1 programming model, 11-10 ram perfect match address register high, 11-27 low, 11-26 receive buffer size register, 11-32 receive control register, 11-23 transceiver connection, 11-3 transmit control register, 11-25 descriptor active register, 11-16 fifo watermark, 11-21 user initialization, 11-33 exception processing overview, 2-25 processor exceptions, 2-28 stack frame definition, 2-27 exceptions bus, 20-3 execution timings miscellaneous, 2-24 one operand, 2-22 two operands, 2-22 external bus interface overview, 1-5 f fault-on-fault halt, 5-16 features overview, 1-1 frame reception, 11-5
index MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor index-3 g gpio overview, 17-1 port control registers, 17-2 , 17-8 data direction registers, 17-10 data registers, 17-11 h halt, fault-on-fault, 5-16 hardware ethernet initialization, 11-33 hash table ethernet algotithm, 11-8 i initialization sequence ethernet, 11-33 instruction cache interaction with other modules, 4-8 operation, 4-8 overview, 4-7 physical organization, 4-7 programming model, 4-12 reset, 4-10 instruction ex ecution times, 2-24 instruction set fetch pipeline, 2-2 general summary, 2-13 mac summary, 3-4 mac unit execution times, 3-4 summary, 2-15 integer data formats, 2-9 memory, 2-11 registers, 2-10 integer data formats in memory, 2-11 integer data formats in registers, 2-10 interrupt controller overview, 7-1 pending and mask registers, 7-4 , 7-5 , 7-5 , 7-5 interrupts bus acknowledge cycles, 20-19 plic gci, 13-10 request inputs, 19-23 j jtag bdm debug port, 21-2 boundary scan register, 21-4 idcode register, 6-11 instruction register, 21-7 overview, 21-1 restrictions, 21-8 tap controller, 21-3 test access port, 21-2 l local memory module interactions, 4-1 registers, 4-2 loopback, ethernet internal and external, 11-8 m mac data representation, 3-4 hardware support, 2-3 instruction execution timings, 3-4 instruction set summary, 3-4 operation, 3-3 programming model, 2-4 , 2-7 programming modelprogramming models mac, 3-2 matching buffering and impedance, b-1 mbar, 7-6 , 7-8 mechanical data package dimensions, 22-2 pinout, 22-1 memory integer data formats, 2-11 memory maps list of tables, a-1 usb, 12-7 memory, sim register, 6-2 mii serial management channel timing, 23-20 transmit signal timing, 23-18 modules base address register, 2-9 debug, 2-4 move instructions timing, 2-20 n non-ieee 1149.1 operation, 21-8 o opcodes illegal handling, 2-3 organization, 1-xl output port command registers, 16-18 p parallel input/output ports, 1-6
index MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 index-4 freescale semiconductor pin descriptions, ??? 19-38 address bus, 19-19 byte strobes, 19-20 clock, 19-25 data bus, 19-19 dynamic data bus sizing, 19-19 general-purpose i/o ports, 19-24 interrupt request inputs, 19-23 jtag test access port and bdm debug port, 19-35 ? 19-37 operating mode configuration, 19-37 pli tdm ports, 19-30 ? 19-35 power supply, 19-38 qspi signals, 19-29 ??? rsti , 19-23 sdram bank selects, 19-23 clock enable, 19-22 column address strobe, 19-22 row address 10, 19-23 row address strobe, 19-22 write enable, 19-22 uart0 module signals, 19-24 ? 19-25 usb module signals and pa, 19-25 ? 19-27 pipelines instruction fetch, 2-2 operand execution, 2-2 plic aperiodic status register, 13-23 application examples, 13-35 ? 13-42 automatic echo mode, 13-9 b1 data receive registers, 13-15 transmit registers, 13-17 b2 data receive registers, 13-16 transmit registers, 13-17 b-channel hdlc encoded data, 13-6 unencoded data, 13-5 clock select register, 13-34 clock synthesis, 13-11 d data receive registers, 13-16 transmit registers, 13-18 d-channel hdlc encoded data, 13-6 unencoded data, 13-7 d-channel request register, 13-32 d-channel status register, 13-31 frame sync synthesis, 13-13 gci c/i channel receive registers, 13-28 transmit registers, 13-29 transmit status register, 13-30 gci interrupts aperiodic status, 13-10 gci monitor channel receive registers, 13-24 transmit abort register, 13-26 transmit registers, 13-25 transmit status register, 13-27 gci/idl b- and d-channel receive data registers, 13-3 transmit data registers, 13-4 b- and d-channel bit alignment, 13-5 block, 13-3 d-channel contention, 13-8 looping modes, 13-8 periodic frame interrupts, 13-9 initialization, 13-35 interrupt configuration example, 13-37 registers, 13-20 interrupt control, 13-11 introduction, 13-1 local loopback mode, 13-9 loopback control register, 13-20 periodic status registers, 13-22 port configuration example, 13-35 registers, 13-18 register memory map, 13-13 registers, general, 13-15 remote loopback mode, 13-9 super frame sync generation, 13-13 sync delay registers, 13-33 timing generator, 13-11 ports parallel input/output, 1-6 power management registers, 6-7 program counter, 2-6 programming model pwm, 18-2 qspi, 14-9 programming models ethernet, 11-10 instruction cache, 4-12 mac, 2-7 overview, 2-4 rom, 4-5 sim, 6-2 sram, 4-2 supervisor, 2-7 , 2-7 user, 2-4 pst outputs, 5-3 pulse instruction, 5-3 pwm control register, 18-3 operation, 18-2 overview, 18-1
index MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor index-5 programming model, 18-2 width register, 18-4 q qspi address register, 14-14 baud rate selection, 14-6 command ram bit description, 14-15 data register, 14-14 delay register, 14-11 interrupt, 14-13 mode register, 14-9 module description, 14-1 operation, 14-3 overview and features, 14-1 programming example, 14-16 model, 14-9 ram command, 14-6 model, 14-4 receive, 14-5 transmit, 14-6 slave bus interface, 14-3 transfer data, 14-8 delays, 14-7 length, 14-8 wrap register, 14-12 r ram qspi command bit description, 14-15 usb configuration, 12-28 , 12-30 ram base address registers, 2-9 rambar overview, 4-3 power management programming, 4-4 read/write, bus, 20-2 registers a0?a6, 2-5 a7, 2-5 aatr, 5-7 ablr/abhr, 5-6 , 5-9 access control, 2-9 , 4-14 activate low-power, 6-10 address, 2-5 address (a0 ? a6), 2-5 alpr, 6-10 b2 data transmit, 13-17 bi data receive, 13-15 cache configuration, 2-9 cache control, 4-12 cacr, 2-9 ccr, 2-6 chip select base, 8-3 general, 8-2 option, 8-5 condition code, 2-6 , 2-6 condition code (ccr), 2-6 csbr, 8-3 csor, 8-5 csr, 5-10 d data receive, 13-16 d0?d7, 2-5 data, 2-5 data breakpoint/mask, 5-12 data d0 - d7, 2-5 dbcr, 10-6 d-channel request, 13-32 ddar, 10-6 debug attribute trigger, 5-7 descriptor active, 11-15 device identification, 6-11 dir, 10-4 dma byte count, 10-6 controller, 10-2 destination address, 10-6 interrupt, 10-4 mode, 10-2 sourse address, 10-5 dmr, 10-2 dsar, 10-5 ethernet control, 11-11 fifo receive bound, 11-19 receive start, 11-20 transmit start, 11-22 gci c/i channel transmit status, 13-30 monitor channel transmit abort, 13-26 gpio control port, 17-2 ? 17-8 data, 17-11 data direction, 17-10 hash table high, 11-28 low, 11-29 idcode, 6-11 integer data formats in, 2-10 interrupt event, 11-12 mask, 11-13 vector status, 11-14 interrupt controller pending and mask, 7-5 , 7-5
index MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 index-6 freescale semiconductor interrupt controller, pending and mask, 7-4 , 7-5 jtag instruction, 21-7 local memory, 4-2 mask, 2-6 maximum frame length, 11-24 mbar, 2-9 , 6-3 mii management frame, 11-17 mii speed control, 11-18 module base address, 2-9 output port command, 16-18 p0b1rr?p3b1rr, 13-15 p0b2rr?p3b2rr, 13-16 p0cr?p3cr, 13-18 p0gcir?p3gcir, 13-28 p0gmt?p3gmt, 13-25 p0icr?p3icr, 13-20 p0psr?p3psr, 13-22 p0sdr?p3sdr, 13-33 p3b1tr?p0b1tr, 13-17 p3b2tr?p0b2tr, 13-17 p3drr?p0drr, 13-16 p3dtr?p0dtr, 13-18 p3gcit?p0gcit, 13-29 p3gmr?p0gmr, 13-24 paddr, 17-10 par, 7-9 pasr, 13-23 pbddr, 17-10 pbr, 5-13 pcddr, 17-11 pcsr, 13-34 pdcsr, 13-31 pdrqr, 13-32 pgcitsr, 13-30 pgmta, 13-26 pgmts, 13-27 plcr, 13-20 plic aperiodic status, 13-23 b1 data transmit, 13-17 b2 data receive, 13-16 clock select, 13-34 d data transmit, 13-18 d-channel status, 13-31 gci c/i channel receive, 13-28 transmit, 13-29 gci monitor channel general, 13-24 transmit, 13-25 transmit status, 13-27 general, 13-15 interrupt configuration, 13-20 loopback control, 13-20 memory map, 13-13 periodic status, 13-22 port configuration, 13-18 receive data, 13-3 sync delay, 13-33 transmit data, 13-4 pmr, 6-7 pointer-to-receive descriptor ring, 11-30 pointer-to-transmit descriptor ring, 11-31 power management, 6-7 pwm control, 18-3 pwm width, 18-4 qspi address, 14-14 data, 14-14 delay, 14-11 interrupt, 14-13 mode, 14-9 wrap, 14-12 ram base address, 2-9 ram perfect match address high, 11-27 low, 11-26 rambar, 2-9 rareg/rdreg, 5-22 rcreg, 5-30 rdmreg, 5-32 read control, 5-30 read debug module, 5-32 receive buffer size, 11-32 receive control, 11-23 rom base address, 4-5 scr, 6-5 sdcr, 9-6 sdram configuration, 9-6 general, 9-6 timing, 9-8 sdtr, 9-8 sim base address, 7-6 , 7-8 memory map, 6-2 module base address, 6-3 spr, 6-6 sr, 2-8 sram base address, 4-3 status, 2-8 , 2-8 system configuration, 6-5 system protection, 6-6 tcr, 15-4 tdr, 5-14 ter, 15-5 timer capture, 15-4 event, 15-5 general-purpose, 15-3
index MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor index-7 mode, 15-3 reference, 15-4 tmr, 15-3 transmit control, 11-25 descriptor active, 11-16 fifo watermark, 11-21 trigger definition, 5-14 trr, 15-4 uacr, 16-12 uart modules, 16-2 ? 16-18 ucr, 16-9 ucsr, 16-8 udu/udl, 16-14 , 16-14 , 16-15 , 16-16 uip, 16-17 uipcr, 16-11 uisr, 16-12 usb access, 12-30 alternate settings, 12-12 endpoint control, 12-17 ? 12-20 data, 12-27 data present, 12-28 interrupt mask, 12-26 status interrupt, 12-25 frame number, 12-9 function address, 12-11 usb general, 12-9 ? 12-28 vb, 2-8 vector base, 2-8 , 2-8 wareg/wdreg, 5-23 watchdog counter, 6-13 event, 6-13 interrupt reference, 6-12 wcr, 6-13 wcreg, 5-31 wdmreg, 5-33 wer, 6-13 wirr, 6-12 write control, 5-31 write debug module, 5-33 reset instruction cache, 4-10 rom base address register, 4-5 operation, 4-5 overview, 4-5 programming model, 4-5 rombar overview, 4-5 power management programming, 4-6 s sdcr, 9-12 sdram auto initialization, 9-9 banks, page hits, page misses, 9-6 configuration register, 9-6 controller signals, 9-1 devices interface, 9-4 interface, 9-14 performance, 9-10 power-down and self-refresh, 9-9 read accesses, 9-15 refresh timing, 9-20 registers, 9-6 solving timing issues, 9-12 timing register, 9-8 write accesses, 9-18 serial management channel timing, 23-20 signals bus control, 19-20 ? 19-23 bypass, 19-22 chip selects, 19-19 clear-to-send, 19-25 cpu clock and reset, 19-23 cpu external clock, 19-23 dreseten , 19-23 ethernet module, 19-27 ? 19-29 hi-z, 19-22 output enable/read, 19-20 pwm module, 19-29 read/write, 19-21 receive serial data input, 19-25 request to send, 19-25 reset output, 19-23 timer module, 19-27 , 19-27 transfer acknowledge, 19-22 transmit serial data output, 19-24 usb receive data negative, 19-25 receive serial data input, 19-25 rx data output, 19-26 suspend driver, 19-26 transmit data negative, 19-26 transmit serial data output, 19-25 transmitter output enable, 19-26 usb_clk, 19-26 usb_d+ and usb_d-, 19-26 wake-on-ring, 19-26 sim overview, 1-5 programming model, 6-2 register memory map, 6-2 software watchdog timer, 6-11 sram
index MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 index-8 freescale semiconductor base address register, 4-3 initialization, 4-4 overview and operation, 4-2 programming model, 4-2 stack pointer, 2-5 , 2-5 status register, 2-8 stop instruction, 5-4 , 5-16 suggested reading, 1-xliii supervisor programming model, 2-7 system configuration and protection, 1-5 system protection register, 6-6 t tap controller, 21-3 tcn0?tcn3, 15-4 test access port, 1-7 timer module capture registers, 15-4 counters, 15-4 event registers, 15-5 general-purpose registers, 15-3 mode registers, 15-3 operation, 15-1 overview, 1-7 , 15-1 reference registers, 15-4 timers bus software watchdog, 20-24 timing branch instruction execution, 2-25 clock input and output, 23-5 fast ethernet ac, 23-17 gpio port ac, 23-28 jtag ac, 23-30 mac unit instructions, 3-4 mii transmit signal, 23-18 mii async input signal, 23-19 move instructions, 2-20 one operand, 2-22 pli, 23-23 processor bus input, 23-6 sdram interface, 23-14 serial management channel, 23-20 timer module ac, 23-21 two operands, 2-22 usart ac, 23-22 usb interface ac, 23-29 timings sdram refresh, 9-20 transmit signal timing, 23-18 u uart modules bus operation interrupt acknowledge cycles, 16-29 read cycles, 16-29 write cycles, 16-29 clock source baud rates, 16-20 external clock, 16-21 fifo stack in uart0, 16-25 initialization sequence, 16-30 looping modes, 16-26 automatic echo, 16-27 local loop-back, 16-27 remote loop-back, 16-27 mode registers, 16-4 multidrop mode, 16-28 overview, 1-6 programming, 16-30 receiver enabled, 16-24 register description, 16-2 serial overview, 16-2 signal definitions, 16-18 transmitter/receiver clock source, 16-19 modes, 16-22 transmitting in uart mode, 16-22 usb access times, 12-30 alternate settings register, 12-12 architecture, 12-2 attachment detection, 12-36 buffer descriptors, 11-34 class- and vendor-specific request operation, 12-34 clock generator, 12-4 configuration and interface changes, 12-31 configuration ram, 12-28 , 12-30 control logic, 12-4 control, bulk, and interrupt endpoints, 12-33 data flow, 12-32 device configuration example, 12-29 endpoint controllers, 12-5 data present registers, 12-28 data registers, 12-27 fifos, 12-30 halt feature, 12-35 interrupt mask registers, 12-26 status interrupt registers, 12-25 endpoint control registers, 12-17 , 12-20 fifo configuration, 12-32 frame number match register, 12-9 function address register, 12-11 in endpoints, 12-33 , 12-34 initialization, 12-31
index MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 freescale semiconductor index-9 isochronous endpoints, 12-33 line interface, 12-36 memory map, 12-7 module operation, 12-2 out endpoints, 12-33 , 12-34 overview, 12-1 pcb layout recommendations, 12-36 register access, 12-30 descriptions, 12-9 , 12-28 remote wakeup and resume operation, 12-35 request processor, 12-5 software architecture and application notes, 12-31 transceiver interface, 12-3 user programming model, 2-5 v variant address, 5-4 vector base register, 2-8 , 2-8 version 2 coldfire core overview, 1-4 w wait state generation overview, 1-5 watchdog counter register, 6-13 event register, 6-13 interrupt reference register, 6-12 wddata execution, 5-3
index MCF5272 coldfire ? integrated microprocessor user?s manual, rev. 3 index-10 freescale semiconductor
overview coldfire core hardware multiply/accumulate (mac) unit local memory debug support system integration module (sim) interrupt controller chip-select module sdram controller dma controller module ethernet module universal serial bus (usb) physical layer interface controller (plic) queued serial peripheral interface (qspi) module timer module uart modules general-purpose i/o module pulse-width modulation (pwm) module signal descriptions bus operation appendix b: buffering and impedence matching index appendix a: list of memory maps 1 2 3 4 5 7 8 9 10 11 12 13 14 15 16 17 18 19 a 6 20 b ind 21 23 22 ieee 1149.1 test access port (jtag) mechanical data electrical characteristics
overview coldfire core hardware multiply/accumulate (mac) unit local memory debug support system integration module (sim) interrupt controller chip-select module sdram controller dma controller module ethernet module universal serial bus (usb) physical layer interface controller (plic) queued serial peripheral interface (qspi) module timer module uart modules general-purpose i/o module pulse-width modulation (pwm) module signal descriptions bus operation appendix b: buffering and impedence matching index appendix a: list of memory maps 1 2 3 4 5 7 8 9 10 11 12 13 14 15 16 17 18 19 a 6 20 b ind 21 23 22 ieee 1149.1 test access port (jtag) mechanical data electrical characteristics
blank
how to reach us: home page: www.freescale.com e-mail: support@freescale.com usa/europe or locations not listed: freescale semiconductor technical information center, ch370 1300 n. alma school road chandler, arizona 85224 +1-800-521-6274 or +1-480-768-2130 support@freescale.com europe, middle east, and africa: freescale halbleiter deutschland gmbh technical information center schatzbogen 7 81829 muenchen, germany +44 1296 380 456 (english) +46 8 52200080 (english) +49 89 92103 559 (german) +33 1 69 35 48 48 (french) support@freescale.com japan: freescale semiconductor japan ltd. headquarters arco tower 15f 1-8-1, shimo-meguro, meguro-ku, tokyo 153-0064 japan 0120 191014 or +81 3 5437 9125 support.japan@freescale.com asia/pacific: freescale semiconductor hong kong ltd. technical information center 2 dai king street tai po industrial estate tai po, n.t., hong kong +800 2666 8080 support.asia@freescale.com for literature requests only: freescale semiconductor literature distribution center p.o. box 5405 denver, colorado 80217 1-800-441-2447 or 303-675-2140 fax: 303-675-2150 ldcforfreescalesemiconductor@hibbertgroup.com rohs-compliant and/or pb-free versions of freescale products have the functionality and electrical characteristics of their non-rohs-compliant and/or non-pb-free counterparts. for further information, see http://www.freescale.com or contact your freescale sales representative. for information on freescale?s environmental products program, go to http://www.freescale.com/epp . information in this document is provided solely to enable system and software implementers to use freescale semiconduc tor products. there are no express or implied copyright licenses granted hereunder to design or fabricate any integrated circuits or integrated circuits based on the information in this document. freescale semiconductor reserves the right to make changes without further notice to any products herein. freescale semiconductor makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does freescale semiconductor assume any liability arising out of the application or use of any product or circuit, and specifically disclai ms any and all liability, including without limitation consequential or incidental damages. ?typical? parameters that may be provided in freescale semiconductor data shee ts and/or specificati ons can and do vary in different applications and actual perfo rmance may vary over time. all operating parameters, including ?typicals?, must be validated for each customer application by customer?s technical experts. freescale semiconductor does not convey any license under its patent rights nor the rights of others. freescale semiconductor products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the freescale semiconductor product could create a situation where personal injury or death may occur. should buyer purchase or use freescale semiconductor products for any such unintended or unauthorized application, buyer shall indemnify and hold freescale semiconductor and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that freescale semiconductor was negligent regarding the design or manufacture of the part. freescale? and the freescale logo are trademarks of freescale semiconductor, inc. all other product or service names are the property of their respective owners. ? freescale semiconductor, inc. 2002, 2006, 2007. all rights reserved. MCF5272um rev. 3, 03/2007

▲Up To Search▲

Price & Availability of MCF5272

	To Download MCF5272 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .