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preliminary data sheet february 1999 TTSI2K32T 2048-channel, 32-highway time-slot interchanger features n thirty-two full-duplex, serial time-division multi- plexed (tdm) highways. n full availability, nonblocking 2048-channel time/ space switch. n 2.048 mbits/s (32 time slots), 4.096 mbits/s (64 time slots), or 8.192 mbits/s (128 time slots) data rates, independently programmable per highway. n 64 kbits/s granularity with optional 32 kbits/s (4-bit) and 16 kbits/s (2-bit) subrate switching, selectable per highway. n low-latency mode for voice channels. n frame integrity for wideband data applications. n concentration highway interface (chi) compatible with the iom2, gci, k2, sld, mvip *, st-bus, sc-bus, and h.100. n single highway clock and frame synchronization input. n independently programmable bit and byte offsets with 1/4 bit resolution for all highways. n capable of broadcasting data to the transmit high- ways from a variety of sources including host data. n high-impedance control per time slot. n software-compatible family of 1k, 2k, and 4k time- slot interchangers. n thirty-two independent high-impedance indicators (output enables) for transmit highways, allowing external drivers. n direct access to device registers, connection store, and data store via microprocessor interface. n ieee ? 1149.1 boundary scan (jtag). n test-pattern generation and checking for on-line system testing (prbs, qrss, or user-defined byte). n user-accessible bist for data and connection stores. n 3.3 v power supply with 5 v tolerant i/o. n low-power, high-density cmos technology, and ttl compatible switching thresholds. n 217-pin pbga package. n C40 c to +85 c operating temperature range. * mvip is a registered trademark of natural microsystems corpo- ration. ? ieee is a registered trademark of the institute of electrical and electronics engineers, inc. applications n small and medium digital switch matrices. n computer telephony integration (cti). n access concentrators. n pabx. n cellular infrastructure. n isp modem banks. n t1/e1 multiplexers. n digital cross connects. n digital loop carriers. n multiport ds1/e1 service cards. n lan/wan gateways. n tdm highway data rate adaptation. description the TTSI2K32T time-slot interchanger (tsi) switches data between 32 full-duplex, serial, time- division multiplexed highways. the TTSI2K32T can make any connection between 2048 input and output time slots. each of the 32 transmit and 32 receive highways can be independently programmed for data rate (2.048 mbits/s, 4.096 mbits/s, or 8.192 mbits/s) and offset. the offset can range from 0 bits to 127 bytes and 7 3/4 bits on a 8.192 mbits/s highway. the TTSI2K32T can perform rate adaptation between varying speed highways as well. the TTSI2K32T is configured via a microprocessor interface with a demultiplexed address and data bus. in addition to accessing the registers and connection store, this interface can also be used to read received time slots and specify user data for trans- mission. the TTSI2K32T ensures that interchanged time slots retain their frame integrity. frame integrity is required for applications that switch wideband data (i.e., isdn h-channels). for voice applications where low delay is important, a low-latency mode can be selected.
TTSI2K32T preliminary data sheet 2048-channel, 32-highway time-slot interchanger february 1999 2 lucent technologies inc. table of contents contents page features ....................................................................................................................... ........................................... 1 applications ................................................................................................................... .......................................... 1 description.................................................................................................................... ........................................... 1 functional description ......................................................................................................... .................................... 5 pin information ................................................................................................................ ........................................ 7 typical tsi application ........................................................................................................ .................................. 15 interchange fabric............................................................................................................. .................................... 16 small and large tsis ........................................................................................................... ................................. 17 microprocessor interface ....................................................................................................... ................................ 18 asynchronous mode (mm = 0)..................................................................................................... ...................... 18 synchronous mode (mm = 1) ...................................................................................................... ...................... 19 highway data rate selection.................................................................................................... ............................ 20 mixed-highway data rates ....................................................................................................... ............................ 21 tdm highway interface timing ................................................................................................... .......................... 22 virtual and physical frames .................................................................................................... .......................... 22 tdm highway alignment at zero offset ........................................................................................... ................. 23 tdm highway offsets............................................................................................................ ................................ 23 reset sequence ................................................................................................................. ................................... 24 low-latency and frame-integrity modes .......................................................................................... .................... 25 low latency.................................................................................................................... ................................... 25 frame integrity................................................................................................................ ................................... 26 test-pattern generation ........................................................................................................ ................................ 29 test-pattern checking.......................................................................................................... ................................. 29 error injection ................................................................................................................ ........................................ 30 error checking................................................................................................................. ...................................... 30 jtag boundary-scan specification ............................................................................................... ....................... 31 principle of the boundary scan................................................................................................. ......................... 31 test access port controller .................................................................................................... ........................... 32 instruction register ........................................................................................................... ................................. 34 boundary-scan register......................................................................................................... ........................... 35 bypass register ................................................................................................................ .............................. 35 idcode register................................................................................................................ ............................... 35 3-state procedures ............................................................................................................. ............................... 35 register architecture .......................................................................................................... ................................... 36 configuration register architecture............................................................................................ ........................... 38 transmit highway 3-state options ............................................................................................... ..................... 51 data store memory .............................................................................................................. ................................. 52 connection store memory........................................................................................................ ............................. 52 absolute maximum ratings....................................................................................................... ............................ 55 operating conditions........................................................................................................... .................................. 55 handling precautions ........................................................................................................... ................................. 55 electrical characteristics ..................................................................................................... .................................. 56 timing characteristics ......................................................................................................... .................................. 56 outline diagram................................................................................................................ ..................................... 63 217-pin pbga................................................................................................................... ................................. 63 ordering information........................................................................................................... ................................... 64 ds99-045t1e1 replaces ds97-475tic to incorporate the following updates ................................................... 64
preliminary data sheet TTSI2K32T february 1999 2048-channel, 32-highway time-slot interchanger 3 lucent technologies inc. list of figures figures page figure 1. block diagram of the TTSI2K32T ....................................................................................... ......................6 figure 2. 217-pin pbga (bottom view) ........................................................................................... ........................7 figure 3. a typical tsi application ............................................................................................ ............................15 figure 4. an 8k time-slot switch made from 4k tsis ............................................................................. .............17 figure 5. asynchronous read.................................................................................................... ............................18 figure 6. asynchronous write................................................................................................... .............................18 figure 7. synchronous read ..................................................................................................... ............................19 figure 8. synchronous write.................................................................................................... ..............................19 figure 9. mixed-highway data rates ............................................................................................. .......................21 figure 10. virtual and physical frames ......................................................................................... ........................22 figure 11. synchronization to fsync ............................................................................................ .......................23 figure 12. highway offsets ..................................................................................................... ...............................24 figure 13. mixed low-latency and frame-integrity modes ......................................................................... ..........28 figure 14. block diagram of the TTSI2K32T's boundary-scan test logic ........................................................... 31 figure 15. bs tap controller state diagram..................................................................................... ....................32 figure 16. asynchronous read cycle timing using dt handshake.....................................................................57 figure 17. asynchronous write cycle timing using dt handshake .....................................................................57 figure 18. asynchronous read cycle timing using only cs ...............................................................................58 figure 19. asynchronous write cycle timing using only cs ...............................................................................58 figure 20. synchronous read cycle timing....................................................................................... ...................59 figure 21. synchronous write cycle timing ...................................................................................... ....................59 figure 22. tdm highway timing.................................................................................................. ..........................61 figure 23. jtag interface timing ............................................................................................... ...........................62
TTSI2K32T preliminary data sheet 2048-channel, 32-highway time-slot interchanger february 1999 4 lucent technologies inc. list of tables tables page table 1. data rate and switch size examples .................................................................................... ................... 5 table 2. pin assignments for a 217-pin pbgapin number order ................................................................... ... 8 table 3. pin assignments for a 217-pin pbgasignal name order.................................................................. .10 table 4. TTSI2K32T pin descriptions ............................................................................................ ....................... 12 table 5. the tsi family ........................................................................................................ ................................ 17 table 6. rx highway data rate options.......................................................................................... ..................... 20 table 7. tx highway data rate options .......................................................................................... ..................... 20 table 8. time-slot separation required for transmission with minimum latency (0 offsets) ............................. 25 table 9. offset difference and its effect on frame for transmission............................................................ ........ 27 table 10. offset difference boundaries ......................................................................................... ....................... 27 table 11. tap controller states in the data register branch.................................................................... ........... 33 table 12. tap controller states in the instruction register branch............................................................. ......... 33 table 13. TTSI2K32Ts boundary-scan instructions ............................................................................... ............. 34 table 14. TTSI2K32T register summary ........................................................................................... .................. 36 table 15. general command register (0x00) ..................................................................................... ................. 38 table 16. software reset register (0x01) ....................................................................................... ..................... 39 table 17. bist command register (0x02) ......................................................................................... .................. 39 table 18. idle code 1 register (0x03).......................................................................................... ......................... 40 table 19. idle code 2 register (0x04).......................................................................................... ......................... 40 table 20. idle code 3 register (0x05).......................................................................................... ......................... 40 table 21. global interrupt mask register (0x06)................................................................................ ................... 40 table 22. interrupt status register (0x07) ..................................................................................... ....................... 41 table 23. interrupt mask register (0x08) ....................................................................................... ....................... 42 table 24. test command register (0x09) ......................................................................................... ................... 43 table 25. test-pattern style register (0x0a)................................................................................... ..................... 44 table 26. test-pattern checker highway register (0x0b)......................................................................... ........... 45 table 27. test-pattern checker upper time-slot register (0x0c) ................................................................. ...... 45 table 28. test-pattern checker lower time-slot register (0x0d) ................................................................. ...... 45 table 29. test-pattern checker data register (0x0e)............................................................................ .............. 45 table 30. test-pattern error injection register (0x0f)......................................................................... ................. 45 table 31. test-pattern error counter (byte 0) (0x10) ........................................................................... ................ 46 table 32. test-pattern error counter (byte 1) (0x11) ........................................................................... ................ 46 table 33. test-pattern generator data register (0x12) .......................................................................... ............. 46 table 34. version register (0x13).............................................................................................. ........................... 46 table 35. transmit highway configuration register (byte 0) (0x1000 + 4i) ....................................................... .. 47 table 36. transmit highway configuration register (byte 1) (0x1001 + 4i) ....................................................... .. 48 table 37. transmit highway configuration register (byte 2) (0x1002 + 4i) ....................................................... .. 48 table 38. receive highway configuration register (byte 0) (0x1800 + 4i) ........................................................ .. 49 table 39. receive highway configuration register (byte 1) (0x1801 + 4i) ........................................................ .. 50 table 40. receive highway configuration register (byte 2) (0x1802 + 4i) ........................................................ .. 50 table 41. transmit highway 3-state options..................................................................................... ................... 51 table 42. address scheme for data store memory ................................................................................ ............. 52 table 43. address scheme for connection store memory .......................................................................... ........ 52 table 44. connection store memory (byte 0) ..................................................................................... .................. 53 table 45. connection store memory (byte 1) ..................................................................................... .................. 53 table 46. clock specifications ................................................................................................. ............................. 56 table 47. asynchronous read and write interface timing using dt handshake................................................ 57 table 48. asynchronous microprocessor interface timing using only cs .......................................................... 58 table 49. synchronous microprocessor interface timing .......................................................................... ........... 60 table 50. tdm highway timing ................................................................................................... ......................... 61 table 51. jtag interface timing................................................................................................ ........................... 62
preliminary data sheet TTSI2K32T february 1999 2048-channel, 32-highway time-slot interchanger 5 lucent technologies inc. functional description the TTSI2K32T is a 2048 time-slot switch that can be used in a variety of ways, with some or all of the highways active and running at different data rates. the table below lists a few of the possible combinations of switch size and data rates. by selecting different rates for receive and transmit highways, rate adaptation can be performed also. each one of the 64 (32 transmit and 32 receive) highways can be independently programmed for data rate (2.048 mbits/s, 4.096 mbits/s, or 8.192 mbits/s) as well as a full range of bit (07.75) and byte (0127) offsets. table 1. data rate and switch size examples this device uses a single clock (ck) and frame synchronization (fsync) signal for all highways. the ck rate can be 2.048 mhz, 4.096 mhz, 8.192 mhz, or 16.384 mhz, and this speed is indicated to the device via the ckspd [02] strap pins. a pulse is expected on the fsync pin once every 125 m s. each one of the 2048 time slots can be independently programmed in any one of the data modes listed below: n low latency n frame integrity n host data substitution n idle code substitution n test-pattern substitution (prbs, qrss, or a fixed byte) n high impedance the low-latency mode causes a receive highway time slot to be transmitted as soon as possible, which is depen- dent on the relative offset of the input and output time slots. this mode is useful for voice channels where it is important to keep the transmission delay to a minimum. the frame integrity mode will guarantee that all selected time slots received in a common frame will be transmitted together in a common frame. this mode is useful for wideband data (e.g., isdn h-channels) where multiple time slots received in a single frame cannot be split across two transmit frames. the TTSI2K32T is a nonblocking ds0 (64 kbits/s channel) switch where a time slot is 8 bits. since each rx and tx highway data rate can be individually selected, the TTSI2K32T can also be used to switch time slots that are smaller than 8 bits. n 32 kbits/s channels (4-bit time slots) such as in compressed voice (adpcm) applications. the TTSI2K32T will be configured to sample the data at twice the data rate for highways carrying traffic at 2.048 mbits/s or 4.096 mbits/s. n 16 kbits/s channels (2-bit time slots) such as in cellular (gsm) applications. the TTSI2K32T will be set to sample the data at four times the data rate on a 2.048 mbits/s highway carrying such traffic. n 8 kbits/s channels (1-bit time slots) such as in half-rate gsm applications. this can be done by looping the data through the tsi multiple times, thus oversampling the same data multiple times. however, in this configuration, the total switching capacity of the device will drop and the latency will go up. the TTSI2K32T is one in a family of 1k, 2k, and 4k tsis. the high-impedance control per time-slot feature allows four of the 4k devices to be connected to make an 8k time-slot switch. if external drivers are needed on the transmit highway pins, support for 32 output enables, corresponding to the 32 transmit highways, is provided. number of receive highways used receive highway data rates (mbits/s) receive time slots per frame total switch size number of transmit highways used transmit highway data rates (mbits/s) transmit time slots per frame 32 4.096 64 2048 32 4.096 64 16 8.192 128 2048 16 8.192 128 16 8.192 128 2048 32 4.096 64 16 and 8 4.096 8.192 64 128 2048 10 and 11 4.096 8.192 64 128
TTSI2K32T preliminary data sheet 2048-channel, 32-highway time-slot interchanger february 1999 6 lucent technologies inc. functional description (continued) the device capabilities include several test features for board and device diagnostics. n test-pattern checking on input time slots (prbs, qrss, or a fixed byte). n test-pattern generation on output time slots (prbs, qrss, or a fixed byte). n jtag on all i/o. n software-controlled bist of data store and connection store memory. n test pin for isolating the TTSI2K32T during board test. the microprocessor interface supports two modes of operation, synchronous and asynchronous. these modes are selected based on the mm input pin. both modes provide an 8-bit demultiplexed address and data bus. fifteen address pins allow direct access to the 32 kbyte address space. this interface provides direct access to the control registers and data store and connection store memories. the TTSI2K32T is fabricated using a low-power, high-density, cmos process that nominally operates at 3.3 v with ttl switching thresholds and 5 v tolerance on the inputs and outputs. a basic block diagram of the architecture is shown in figure 1. 5-5780(f).br.1 figure 1. block diagram of the TTSI2K32T connection store microprocessor interface transmit highways data jtag pll rxd0 rxd1 rxd2 rxd3 rxd30 rxd31 ck ckspd0 ckspd1 ckspd2 fsync mm txd0 txoe0 txd1 txoe1 txd31 txoe31 tck tdi tms trst tdo reset int test a[140] d[70] cs as ds r/w dt store receive highways pclk and ck logic data store address tdm data tdm data host address/data bus
preliminary data sheet TTSI2K32T february 1999 2048-channel, 32-highway time-slot interchanger 7 lucent technologies inc. pin information the TTSI2K32T is available in a 217-pin pbga with 1.27 mm (50 mil) pin pitch. 5-6953(f) figure 2. 217-pin pbga (bottom view) u t r p n m l k j h g f e d c b a 1 234567891011121314151617 signal/pwr/gnd thermal balls (should be connected to circuit boards ground plan)
TTSI2K32T preliminary data sheet 2048-channel, 32-highway time-slot interchanger february 1999 8 lucent technologies inc. pin information (continued) table 2. pin assignments for a 217-pin pbga pin number order pin signal name pin signal name pin signal name pin signal name a1 nc c5 txd15 f1 rxd4 k1 rxd11 a2 nc c6 txoe18 f2 v dd k2 rxd10 a3 nc c7 txoe19 f3 rxd20 k3 rxd18 a4 txoe1 c8 txd19 f4 rxd22 k4 v dd a5 txd18 c9 nc f14 nc k8 v ss a6 txd2 c10 txoe3 f15 txd16 k9 v ss a7 v dd c11txd20 f16nc k10v ss a8 nc c12 txoe4 f17 txd17 k14 v dd a9 v dd pll c13 txd22 g1 rxd3 k15 nc a10 ckspd0 c14 txd23 g2 v dd k16 txd9 a11 ckspd2 c15 v ss g3 rxd5 k17 txoe9 a12 txd3 c16 test g4 rxd19 l1 rxd17 a13 nc c17 tck g14 txd26 l2 v dd a14 txoe22 d1 rxd6 g15 txoe26 l3 rxd16 a15 txd21 d2 rxd7 g16 txoe24 l4 rxd9 a16 nc d3 rxd23 g17 txd24 l14 txoe6 a17 v ss d4 v ss h1 v dd l15 v dd b1 rxd25 d5 txoe15 h2 rxd2 l16 nc b2 v ss d6 v dd h3 nc l17 txoe10 b3txoe0 d7nc h4v dd m1 rxd8 b4 nc d8 v dd h8 v ss m2 a8 b5 txd1 d9 v ss h9 v ss m3 a10 b6 txoe2 d10 v dd h10 v ss m4 v dd b7 nc d11 txoe20 h14 v dd m14 txoe25 b8 v ss pll d12 v dd h15 fsync m15 v ss b9 ck d13 txoe23 h16 v dd m16 v ss b10 ckspd1 d14 v ss h17 txoe5 m17 txd10 b11 v dd d15 tdi j1 rxd0 n1 a9 b12 nc d16 tms j2 rxd1 n2 a11 b13 txd4 d17 trst j3 a7 n3 a13 b14 txoe21 e1 rxd12 j4 v ss n4 nc b15 nc e2 rxd21 j8 v ss n14 txoe11 b16 v ss e3 rxd13 j9 v ss n15 int b17 reset e4 rxd14 j10 v ss n16 txoe7 c1 v dd e14 tdo j14 v ss n17 txd6 c2 rxd24 e15 v dd j15 txd5 p1 a12 c3 v ss e16 txoe16 j16 txd8 p2 a14 c4 txd0 e17 txoe17 j17 txoe8 p3 rxd26
preliminary data sheet TTSI2K32T february 1999 2048-channel, 32-highway time-slot interchanger 9 lucent technologies inc. pin information (continued) table 2. pin assignments for a 217-pin pbgapin number order (continued) pin signal name pin signal name p4 v ss t8 ds p5 v dd t9 dt p6 a2 t10 v dd p7 txd30 t11 txd29 p8 v dd t12 txd27 p9 v ss t13 d4 p10 v dd t14 txd13 p11 txoe29 t15 txoe12 p12 d6 t16 v ss p13 nc t17 nc p14 v ss u1 rxd15 p15 cs u2 rxd29 p16 txd25 u3 a0 p17 txd7 u4 a4 r1 mm u5 a6 r2 rxd27 u6 v dd r3 v ss u7 txoe14 r4 rxd31 u8 pclk r5 a3 u9 nc r6 nc u10 d1 r7 txoe31 u11 d3 r8 txd14 u12 txoe28 r9 d0 u13 txoe27 r10 d2 u14 d5 r11 txd28 u15 txoe13 r12 v dd u16 txd11 r13 d7 u17 r/w r14 txd12 r15 v ss r16 as r17 v dd t1 rxd28 t2 v ss t3 rxd30 t4 a1 t5 a5 t6 txd31 t7 txoe30
TTSI2K32T preliminary data sheet 2048-channel, 32-highway time-slot interchanger february 1999 10 lucent technologies inc. pin information (continued) table 3. pin assignments for a 217-pin pbgasignal name order signal name pin signal name pin signal name pin signal name pin a0 u3 nc a16 rxd17 l1 txd17 f17 a1 t4 nc b4 rxd18 k3 txd18 a5 a2 p6 nc b7 rxd19 g4 txd19 c8 a3 r5 nc b12 rxd20 f3 txd20 c11 a4 u4 nc b15 rxd21 e2 txd21 a15 a5 t5 nc d7 rxd22 f4 txd22 c13 a6 u5 nc f14 rxd23 d3 txd23 c14 a7 j3 nc f16 rxd24 c2 txd24 g17 a8 m2 nc h3 rxd25 b1 txd25 p16 a9 n1 nc k15 rxd26 p3 txd26 g14 a10 m3 nc l16 rxd27 r2 txd27 t12 a11 n2 nc n4 rxd28 t1 txd28 r11 a12 p1 nc p13 rxd29 u2 txd29 t11 a13 n3 nc r6 rxd30 t3 txd30 p7 a14 p2 nc t17 rxd31 r4 txd31 t6 as r16 nc u9 tck c17 txoe0 b3 ck b9 nc c9 tdi d15 txoe1 a4 ckspd0 a10 nc a8 tdo e14 txoe2 b6 ckspd1 b10 pclk u8 test c16 txoe3 c10 ckspd2 a11 r/w u17 tms d16 txoe4 c12 cs p15 reset b17 trst d17 txoe5 h17 d0 r9 rxd0 j1 txd0 c4 txoe6 l14 d1 u10 rxd1 j2 txd1 b5 txoe7 n16 d2 r10 rxd2 h2 txd2 a6 txoe8 j17 d3 u11 rxd3 g1 txd3 a12 txoe9 k17 d4 t13 rxd4 f1 txd4 b13 txoe10 l17 d5 u14 rxd5 g3 txd5 j15 txoe11 n14 d6 p12 rxd6 d1 txd6 n17 txoe12 t15 d7 r13 rxd7 d2 txd7 p17 txoe13 u15 ds t8 rxd8 m1 txd8 j16 txoe14 u7 dt t9 rxd9 l4 txd9 k16 txoe15 d5 fsync h15 rxd10 k2 txd10 m17 txoe16 e16 int n15 rxd11 k1 txd11 u16 txoe17 e17 mm r1 rxd12 e1 txd12 r14 txoe18 c6 nc a1 rxd13 e3 txd13 t14 txoe19 c7 nc a2 rxd14 e4 txd14 r8 txoe20 d11 nc a3 rxd15 u1 txd15 c5 txoe21 b14 nc a13 rxd16 l3 txd16 f15 txoe22 a14
preliminary data sheet TTSI2K32T february 1999 2048-channel, 32-highway time-slot interchanger 11 lucent technologies inc. pin information (continued) table 3. pin assignments for a 217-pin pbgasignal name order (continued) signal name pin signal name pin txoe23 d13 v ss c3 txoe24 g16 v ss c15 txoe25 m14 v ss d4 txoe26 g15 v ss d9 txoe27 u13 v ss d14 txoe28 u12 v ss h8 txoe29 p11 v ss h9 txoe30 t7 v ss h10 txoe31 r7 v ss j4 v dd a7 v ss j8 v dd b11 v ss j9 v dd c1 v ss j10 v dd d6 v ss j14 v dd d8 v ss k8 v dd d10 v ss k9 v dd d12 v ss k10 v dd e15 v ss p4 v dd f2 v ss p9 v dd h4 v ss p14 v dd h14 v ss r3 v dd h16 v ss r15 v dd k4 v ss t2 v dd k14 v ss t16 v dd l2 v ss m15 v dd l15 v ss m16 v dd m4 v ss a17 v dd p5 v ss pll b8 v dd p8 v dd p10 v dd r12 v dd r17 v dd t10 v dd u6 v dd g2 v dd h1 v dd pll a9 v ss b2 v ss b16
TTSI2K32T preliminary data sheet 2048-channel, 32-highway time-slot interchanger february 1999 12 lucent technologies inc. pin information (continued) *i u indicates internal 100 k w pull-up resistor, and i d indicates 17.5 k w pull-down resistor. table 4. TTSI2K32T pin descriptions symbol type * description reset i reset (active-low). a low on this pin resets the TTSI2K32T. it is asynchronous to any other clock or input signal. all flip-flops will be cleared when reset is low. all counters, state machines, and configuration registers will be set to the default state following a reset. test i u test (active-low). when low, test causes the output and bidirectional pins of the TTSI2K32T device to be in a high-impedance state. this pin has an internal pull-up resistor. mm i microprocessor mode. when mm = 0, the TTSI2K32T uses an asynchronous type handshake (equal to mode 1 of the lucent dual t1/e1 terminator devices). when mm = 1, the TTSI2K32T uses a synchronous type handshake which requires a host processor clock (pclk) input. both modes use a demultiplexed address and data bus. synchronous mode (mm = 1) asynchronous mode (mm = 0) pclk i host processor clock. valid from 0 mhz to 65 mhz. unused. must be either tied high or low. as i address valid (active-low). valid for one pclk cycle. indicates the start of a processor access. address valid (active-low). indicates a valid address for a processor access. must be held low for the duration of the access. cs i chip select (active-low). this pin is asserted low to enable any transfers through the microprocessor interface. cs should be a decode of all address and cycle type signals defining the mem- ory map location of the TTSI2K32T. chip select (active-low). this pin is asserted low to enable any transfers through the microprocessor interface. cs should be a decode of all address and cycle type signals defining the mem- ory map location of the TTSI2K32T. in this mode, cs is used to control the tristating of dt at the end of the cycle. the input timing requirement of cs rela- tive to as is described in the timing characteristics section on page 56. ds i not used. must be tied high. data valid (active-low). indicates valid data during processor writes. the TTSI2K32T will start driving d[70] when this signal is asserted during pro- cessor reads. dt o data transfer acknowledge (active- low). active for one pclk cycle. indi- cates that data has been written during processor writes. indicates that read data is valid during processor reads. an external pull-up is required on this output. data transfer acknowledge (active- low). indicates that data has been writ- ten during processor writes. indicates that read data is valid during processor reads. once driven active, this signal is held active until as , ds , or cs is removed. an external pull-up is required on this output.
preliminary data sheet TTSI2K32T february 1999 2048-channel, 32-highway time-slot interchanger 13 lucent technologies inc. pin information (continued) table 4. TTSI2K32T pin descriptions (continued) *i u indicates internal 100 k w pull-up resistor, and i d indicates 17.5 k w pull-down resistor. symbol type * description d[7 0] i/o host processor data bus. these pins provide an 8-bit, bidirectional data bus. read data is valid for one pclk cycle coincident with the assertion of dt . write data must be held throughout the access. host processor data bus. these pins provide an 8-bit, bidirectional data bus. write data must be valid for the duration of ds . read data is valid while dt is asserted. a[14 0] i host processor address bus. a14a0 must remain valid throughout the entire processor access. a0 is the least significant address signal and is used to select byte locations. r/w i read/write . this signal indicates a read or write cycle. read cycle is indicated with a logic 1; a write cycle is indicated with a logic 0. int o interrupt. this pin will be asserted to indicate that an interrupt condition has occurred. this output will remain active until the interrupt status register has been cleared (read). the polarity of this output is controlled through the intp bit (bit 3) of the general command register. the default value of this register is 0, which indi- cates active-high. this output is tristated until intoe (bit 4) of the general command register is set to 1. the polarity of this output should be selected before the pin is enabled. rxd[031] i u receive data highways 0 31. serial tdm highways receiving data at rates of 2.048 mbits/s, 4.096 mbits/s, or 8.192 mbits/s. fsync i frame synchronization. this signal indicates the beginning of a frame every 125 m s (8 khz). fsync can be active-low or active-high, but its polarity is the same for all highways. fsync can be sampled on a positive or negative ck edge. time- slot numbers and bit offsets are assigned relative to the detection of fsync. there are no restrictions on the duty cycle of fsync as long as the setup and hold timing requirements relative to ck are met. ck i clock. this input is the clock reference for all the transmit and receive highways. its frequency can be 2.048 mhz, 4.096 mhz, 8.192 mhz, or 16.384 mhz. the fre- quency selection for ck must be set equal to or greater than the fastest highway data rate. ckspd[20] i clock speed select for ck pin. these strap pins indicate the frequency of ck: ckspd2 ckspd1 ckspd0 ck (mhz) 0002.048 0014.096 0108.192 01116.384 1 x x reserved txd[031] o transmit data highways 031. serial tdm highway transmitting data at rates of 2.048 mbits/s, 4.096 mbits/s, or 8.192 mbits/s. during external driver mode, the txd[031] outputs will be continuously driven. the only exception to this is when the test input is asserted. when not in external driver mode, this highway can be tristated on a per-time-slot basis. see table 41, transmit highway 3-state options, on page 51 for a detailed descrip- tion of all methods for 3-stating the transmit highways.
TTSI2K32T preliminary data sheet 2048-channel, 32-highway time-slot interchanger february 1999 14 lucent technologies inc. pin information (continued) table 4. TTSI2K32T pin descriptions (continued) *i u indicates internal 100 k w pull-up resistor, and i d indicates internal 17.5 k w pull-down resistor. symbol type * description txoe[031] o transmit output enables 031. these output pins reflect the active/high-imped- ance status for the corresponding transmit highways. they are continuously driven to reflect the status of the output enables of the transmit highways, regardless of whether or not external driver mode is enabled via the ed (bit 6) in the general com- mand register. the external driver for transmit highway [i] should be enabled when txoe[i] is a 1. also see table 41, transmit highway 3-state options, on page 51 for other meth- ods of 3-stating the transmit highways. tdi i u jtag test data input. tck i jtag test clock. maximum 10 mhz. tms i u jtag test mode select. trst i d jtag test reset (active-low). to disable the jtag interface, tie trst low or leave unconnected. tdo o test data output. v dd p 3.3 v supply. all v dd leads must be connected to the 3.3 v supply. v ss p ground. v dd pll p 3.3 v pll supply. v ss pll and v dd pll should be decoupled with a high-speed capacitor with a value in the range of 2 m f5 m f. v ss pll p pll ground. v ss pll and v dd pll should be decoupled with a high-speed capaci- tor with a value in the range of 2 m f5 m f. nc no connect. this pin must be left unconnected.
preliminary data sheet TTSI2K32T february 1999 2048-channel, 32-highway time-slot interchanger 15 lucent technologies inc. typical tsi application 5-7074(f)r.2 figure 3. a typical tsi application a typical application that requires a tsi is where tdm highways that are carrying different types of data in 8-bit time slots (64 kbits/s channels) need to be switched and sent to different destinations. for example, tdm high- ways may contain time slots that are carrying voice, internet traffic, signaling information, etc. the tsi could be programmed to select all the time slots, carrying internet data from different rx highways to be put on a another tx highway that is connected to a bank of v.90 modems. return data from these modems would be sent via another set of rx highways back to the tsi, which could send the data back out over a tx highway and to a t1 line via a t1 framer and liu. similarly, time slots containing signaling information which is hdlc formatted can be sent to a bank of hdlc for- matters. voice channels that have echo on them could be selectively sent to echo cancellers. data that needs to be sent to another card in the system could be put on the system backplane via optional bus drivers. hdlc formatters echo cancellers v.90 modems (dsps) ds0 service complex microprocessor t1/e1 lines t1/e1 lius t7698 t7693 t1/e1 liu and framer ics t7630/t7633 t1/e1 framers t7230a tfra08c13 system backplane (8.192 mbits/s) tsi t x highways r x highways microprocessor bus
TTSI2K32T preliminary data sheet 2048-channel, 32-highway time-slot interchanger february 1999 16 lucent technologies inc. interchange fabric the time-slot interchanger core has a memory-based architecture. the received time slots are converted from serial to parallel by the receive highways block and stored in an internal dual-ported memory called the data store, see figure 1, block diagram of the TTSI2K32T on page 6. these time slots are then read out of the data store in the order specified by the connection store, converted from parallel to serial by the transmit highways section, and sent out on the transmit highways. all the time slots (bytes) coming into the device are stored in the data store. each tdm highway can bring in up to 32 valid time slots at 2.048 mbits/s, 64 time slots at 4.096 mbits/s, or 128 time slots on an 8.192 mbits/s highway, during a 125 m s frame. with 16 rx highways running at the maximum rate of 8.192 mbits/s, the maximum capacity of the switch will be utilized. the addresses used to retreive the data from the data store are stored in the connec- tion store. if host substituted data is to be transmitted instead of data that was received on a tdm highway, then it is stored in the connection store. note that this device can switch any 2048 time slots from the 4096 possible recieve time-slot positions, restricted only by the data rate selection criteria for the rx highways (see table 6, rx highway data rate options, on page 20). similarily on the tx side, this device can place the 2048 switched time slots into any of the 4096 possible transmit time-slot positions, restricted only by the tx data rate selection criteria (see table 7, tx highway data rate options, on page 20). any mode that is selected on a time-slot basis is typically made via the connection store. there are 8192 bytes in the connection store, two for each time slot that can be selected for transmission. each one of the 4096 possible transmit time slots can be individually 3-stated. this is useful when multiple devices need to drive the same tdm highway as a bus or backplane. for extra drive, 32 individual output enables (txoe pins) are also provided to indi- vidually control an external bus or backplane driver, one for each transmit highway. a low latency (send as soon as possible) or frame integrity (keep tagged time slots from the same highway together in the same frame) can also be selected on a time-slot basis. the user also has the option to send one of 13 predefined test patterns, a user- defined byte, or one of three user-defined idle codes, on any time slot of any tx highway. time slots received on any tdm highway can be easily broadcasted on any transmit highway using the connection store. if, for example, the entire connection store is filled with all zeros, this then implies low-latency mode and that the source for all transmitted data is rx highway 0, time slot 0. thus, the data received on rxd0 time slot 0 will end up being broadcasted on all outgoing time slots.
preliminary data sheet TTSI2K32T february 1999 2048-channel, 32-highway time-slot interchanger 17 lucent technologies inc. small and large tsis the TTSI2K32T is one in a family of time-slot interchanger (tsi) devices offered by lucent technologies micro- electronics group. this family of devices are all software compatible since they all have similar register maps. the larger devices of course have extra registers to configure the extra highways and also have larger connection and data stores. however, software written for a smaller tsi will run without alterations with a larger device. the TTSI2K32T and ttsi4k32t are also pin compatible, since they are in the same package. the capacity of the ttsi1k16t can be fully utilized by receiving and/or transmitting data on all 16 highways at 4.096 mbits/s or eight highways at 8.192 mbits/s. similarly, the TTSI2K32T can be fully utilized by receiving and/or transmitting data on all 32 highways at 4.096 mbits/s or 16 highways at 8.192 mbits/s. other combinations of differ- ent data rates on different highways can also be used to fully utilize the ttsi1k16t and TTSI2K32T. the capacity of the ttsi4k32t is fully utilized only when data is being received and/or transmitted on all 32 highways at 8.192 mbits/s. the ttsi4k32t can be used to make even larger switches; for example, an 8192 time-slot switch with 64 rx and 64 tx highways. the rx and tx highways of the 8k switch are labeled lrxd[063] and ltxd[063], respec- tively, in the figure below. 5-7076(f)r.1 figure 4. an 8k time-slot switch made from 4k tsis lrxd[031] are sent to both tsi #1 and #2. similarly, lrxd[3263] are sent to both tsi #3 and #4. the txd[031] of tsi #1 are wire-ored with the txd[031] of tsi #3, to make ltxd[031]. similarly, the txd[031] of tsi #2 are wire-ored with the txd[031] of tsi #4, to make ltxd[3263]. now, if time slots on highway lrxd0 need to be switched to ltxd63, it can be done via tsi #2. the connection stores of tsi #2 and #4 must be programmed such that they both never drive their txd31 simultaneously. the 3-state per time-slot feature of the tsi allows this to be accomplished easily. table 5. the tsi family device time-slot capacity number of rx/tx highways package ttsi1k16t 1024 16/16 144-pin tqfp TTSI2K32T 2048 32/32 217-pin pbga ttsi4k32t 4096 32/32 217-pin pbga ttsi4k32t #1 ltxd[031] lrxd[3263] ltxd[3263] lrxd[031] ttsi4k32t #2 ttsi4k32t #3 ttsi4k32t #4
TTSI2K32T preliminary data sheet 2048-channel, 32-highway time-slot interchanger february 1999 18 lucent technologies inc. microprocessor interface the host interface is designed to connect directly to a typical synchronous or asynchronous host bus. the interface to the TTSI2K32T includes a separate clock, pclk, which is used only in the synchronous interface mode. this device will be a slave on the host bus and will provide the host microprocessor with the capability to read and write the TTSI2K32T address space in a minimal number of clock cycles. there is no posting of writes in the host inter- face, and all registers and the data and connection stores are directly accessible. asynchronous mode (mm = 0) the following two timing diagrams show read and write in the asynchronous mode. 5-6954(f).r3 figure 5. asynchronous read 5-6955(f)r.3 figure 6. asynchronous write the presence of as , cs , and ds being asserted will start the TTSI2K32T internal access. once data has been retrieved or written, dt will be asserted indicating the TTSI2K32T is ready to terminate the access. dt will continue to be asserted until as , cs , or ds is negated. the duration of an asynchronous read or write cycle will be a maximum of 183 ns. this duration is measured from when as , cs , and ds are all asserted low until dt is asserted low by the TTSI2K32T. read data tsi read address d[70] a[140] cs as r/w ds dt high impedance 183 ns max tsi write data tsi write address d[70] a[140] cs as r/w ds dt high impedance 183 ns max
preliminary data sheet TTSI2K32T february 1999 2048-channel, 32-highway time-slot interchanger 19 lucent technologies inc. microprocessor interface (continued) synchronous mode (mm = 1) the following two timing diagrams show read and write in the synchronous mode. 5-6956(f)r.4 figure 7. synchronous read 5-6957(f)r.3 figure 8. synchronous write the synchronous write or read cycle is started when as is sampled active with the rising edge of pclk. in order for the TTSI2K32T to respond, cs must be active during the first or second cycle of an access depending on the value of csv (bit 7) of the general command register. once data has been retrieved or written, dt will be asserted for one clock, terminating the access. the duration of a synchronous read or write cycle is a combination of two periods of time. one period is the dura- tion of the internal cycle, which will be a maximum of 160 ns. the other time period is the initiation, termination, and synchronization of activity on the processor bus, which will be a maximum of six pclk cycles. the total duration of the cycle, from the assertion of as to the removal of dt , will be the sum of these two periods of time. note: the number of processor clock cycles can be reduced by one pclk cycle if the cs input signal can be delivered soon enough to be sampled with as and csv (bit 7) of the general command register is set to a 1. read address pclk d[70] a[140] cs as dt r/w read data high impedance write data write address pclk d[70] a[140] cs as dt r/w high impedance
TTSI2K32T preliminary data sheet 2048-channel, 32-highway time-slot interchanger february 1999 20 lucent technologies inc. highway data rate selection the highway data rate for a particular transmit or receive highway is selected by setting hdr[10] (bits 10) in byte 2 of the highway configuration registers. all of the highways in the TTSI2K32T are grouped into pairs. rxd0 is paired with rxd1, rxd2 is paired with rxd3, . . . , and rxd30 is paired with rxd31. similarly, txd0 is paired with txd1, txd2 is paired with txd3, . . . , and txd30 is paired with txd31. the maximum combined bandwidth that each pair can handle is 8.192 mbits/s. if the programmed bandwidth of a pair exceeds 8.192 mbits/s, one or both highways will be set to idle automatically. the register contents will not be altered to reflect this, but that particular receive or transmit highway will not carry any traffic. table 6 shows the valid rx highway data rate options for a particular rx highway pair. table 6. rx highway data rate options * i = 0, 1, 2, . . . , 15. table 7 shows the valid tx highway data rate options for a particular tx highway pair. table 7. tx highway data rate options * i = 0, 1, 2, . . . , 15. to meet the 8.192 mbits/s bandwidth requirement for a transmit highway pair, a transmit highway may have to be disabled. this is done by setting its data rate to 0.000 mbits/s and not by setting its xe bit to 0 in the transmit con- figuration register. rxd[2i] data rate (mbits/s) * rxd[2i + 1] data rate (mbits/s) * 0.000 0.000 0.000 2.048 0.000 4.096 0.000 8.192 2.048 0.000 2.048 2.048 2.048 4.096 4.096 0.000 4.096 2.048 4.096 4.096 8.192 0.000 txd[2i] data rate (mbits/s) * txd[2i + 1] data rate (mbits/s) * 0.000 0.000 0.000 2.048 0.000 4.096 0.000 8.192 2.048 0.000 2.048 2.048 2.048 4.096 4.096 0.000 4.096 2.048 4.096 4.096 8.192 0.000
preliminary data sheet TTSI2K32T february 1999 2048-channel, 32-highway time-slot interchanger 21 lucent technologies inc. mixed-highway data rates each receive (rx) highway can be selected to sample at a rate of either 2.048 mbits/s, 4.096 mbits/s, or 8.192 mbits/s. this rate selection is made via the hdr[10] field in the receive highways configuration register (byte 2). similarly, each transmit (tx) highway can be programmed to clock the data out at 2.048 mbits/s, 4.096 mbits/s, or 8.192 mbits/s via the transmit highway configuration register (byte 2). thus, 64 independent data rate selections can be made: 32 on the rx side and 32 on the tx side. highways can also be selected to be idle, i.e., neither receiving nor transmitting data. the data rate on a receive highway does not have to match that on its corresponding transmit highway either, e.g., rxd0 and txd0 data rates can be different. data received on a 2.048 mbits/s highway can be transmitted on a 4.096 mbits/s or 8.192 mbits/s highway too. all of this flexibility allows this device to be used to solve a variety of design problems such as data rate adaptation, etc. many slow-speed highways can also be combined and sent out on a single high-speed highway. the figure below depicts an example where time slots are being received on different highways at different data rates and are being switched and sent out at a slower, same, or faster data rate. each rectangle, labeled an, represents an 8-bit time slot. 5-7077(f) figure 9. mixed-highway data rates fsync rxd0 (2 mbits/s) a rxd1 (4 mbits/s) b c d e f g h i j k l m n rxd2 (8 mbits/s) txd2 (2 mbits/s) txd3 (4 mbits/s) txd4 (8 mbits/s) a c g d e b f h i j k l n m
TTSI2K32T preliminary data sheet 2048-channel, 32-highway time-slot interchanger february 1999 22 lucent technologies inc. tdm highway interface timing virtual and physical frames figure 10 below shows a virtual frame offset from the physical frame. the fsync pulse marks the beginning of the physical frame, but the tsi can be programmed to interpret the location of time slot 0 at any point in a frame. sev- eral parameters are available to make up the offset for a virtual frame with various levels of granularity. there is xtsoff/rtsoff for transmit/receive time-slot offsets. this offset can be up to 31 time slots for a 2.048 mbits/s highway, 63 time slots for a 4.096 mbits/s highway, or 127 time slots for an 8.192 mbits/s highway. xbitoff/ rbitoff allow the setting of up to a 7-bit offset for transmit/receive frames. xfboff/rfboff allow fractional bit offsets of 0, 1/4, 1/2, or 3/4 bits. all of these offsets mentioned above can be independently programmed for each one of the transmit and receive highways. the maximum offset that can be introduced on an 8.192 mbits/s highway is 127 time slots, 7 3/4 bits. the maximum offset on a 4.096 mbits/s highway is 63 time slots and 7 3/4 bits. the maximum offset on a 2.048 mbits/s highway is 31 time slots, 7 3/4 bits. the following examples indicate how virtual offsets can be used to simplify system designs. for example, data that is being sent to the tsi on a particular rx highway may have incurred a several time-slot delay due to processing by hdlc formatters, echo cancellers, communication protocol processors, etc. rather than adding an external buffer to realign all the highway data to the next fsync, an offset to create a virtual frame on that rx highway can be used instead. on a transmit highway, for example, there may be a device downstream that has a processing latency of n time slots. an offset of (32 C n) time slots can be added beforehand on a 2.048 mbits/s highway so that after processing, the tdm data is aligned to fsync again. fractional bit offsets are handy for adjusting the sampling point on a rx highway. with a 1/4-bit resolution possible, setup and hold time requirements on the rx tdm highways for the tsi should be easily met. on transmit high- ways, fractional bit offsets can be used to shift the outgoing highway data slightly, so the destination devices setup and hold times can be met with adequate margins. note that the time slot, bit, and fractional bit offsets are relative to the highway data rate and imply different durations on different speed highways. for example, a 1/4-bit offset on a 2.048 mbits/s highway means 122 ns, on a 4.096 mbits/s highway, it is 61 ns, and on an 8.192 mbits/s highway, it implies a 30.5 ns offset. 5-7464(f)r.2 figure 10. virtual and physical frames fsync rx highway tx highway physical frame, n physical frame, n + 1 virtual rx frame, n virtual rx frame, n + 1 virtual tx frame, n virtual tx frame, n + 1 tx offset rx offset
preliminary data sheet TTSI2K32T february 1999 2048-channel, 32-highway time-slot interchanger 23 lucent technologies inc. tdm highway interface timing (continued) tdm highway alignment at zero offset the tdm highway interface logic is designed to make interconnection to the TTSI2K32T as simple as possible. consider the timing diagram shown in figure 11 below. assume the following configuration register settings: n fsync is active-high, fsp (bit 2) is set to 1 in the general command register. n fsync is sampled by the rising edge of ck, fsse (bit 1) is set to 1 in the general command register. n the tx and rx highways are all set for zero bit and time-slot offset. n the input ck speed is equal to the highway data rate. one can see that time slot 0 of a frame coincides with the sampling of an active fsync. at that edge: n bit 0 of time slot 0 is latched from the rx highway with the coincident clock. n bit 0 of time slot 0 is transmitted starting with the coincident clock. 5-6958(f)r.2 figure 11. synchronization to fsync tdm highway offsets an offset may be added to the sampling of rx time slot 0, bit 0 or the transmission of tx time slot 0, bit 0. this can be done on any of the receive and/or transmit highways, totally independent from one another. this is done by set- ting the time-slot offset number, bit offset number, and fractional bit offset number on a per-highway basis using the receive and transmit highway configuration registers. to illustrate this point, consider the timing diagram shown in figure 12 on page 24. assume the following configuration register programming: n the input ck speed is set to 8.192 mhz. n fsync is active-high, fsp (bit 2) is set to 1 in the general command register. n fsync is sampled by the rising edge of ck, fsse (bit 1) is set to 1 in the general command register. n the rxd0 highway is set for 3/4-bit offset and a highway data rate of 4.096 mbits/s. n the txd0 highway is set for 1-bit offset and a highway data rate of 2.048 mbits/s. one can see that bit 0 of the receive time slot 0 is sampled 1 and 1/2 ck cycles after fsync is sampled active. since ck is set for 8.192 mhz and rxd0 is set for 4.096 mbits/s, then 1 and 1/2 ck cycles equals 3/4 of a 4.096 mbits/s bit period. fsync sampled active rx time slot 0, bit 0 rx time slot 0, bit 0 tx time slot 0, bit 0 tx time slot 0, bit 1 fsync ck t x highway r x highway rx time slot 0 bit 0 sample point
TTSI2K32T preliminary data sheet 2048-channel, 32-highway time-slot interchanger february 1999 24 lucent technologies inc. tdm highway offsets (continued) one can also see that bit 0 of the transmit time slot 0 is driven four ck cycles after fsync is sampled active. since ck is set for 8.192 mhz and txd0 is set for 2.048 mbits/s, then four ck cycles equals one 2.048 mbits/s bit period. 5-7062(f)r.2 figure 12. highway offsets reset sequence the reset sequence of the TTSI2K32T is related to the pll operation. in order for the chip to be properly reset, the pll must have already established a lock on the ck input signal. that event will occur 250 m s after the ck input is functioning. after the pll is locked onto the input clock, the TTSI2K32T will be in a reset state within 200 ns. this results in a reset time of 250.2 m s. subsequent resets will take 200 ns, provided ck is not interrupted. reset is an asynchronous signal and requires no setup or hold margins relative to any other input clock or signal. after a reset, bist must be run on the TTSI2K32T to bring all the memories in the device to a known state. this is required for correct operation of the chip. see the description below table 17, bist command register (0x02), on page 39, on how to run bist. time slot 63, bit 7 time slot 0, bit 0 time slot 0, bit 1 time slot 31, bit 6 time slot 31, bit 7 time slot 0, bit 0 fsync ck8.192 mhz rxd04.096 mbits/s txd02.048 mbits/s fsync sampled active rx time slot 0 bit 0 sample point (3/4-bit offset) (1-bit offset)
preliminary data sheet TTSI2K32T february 1999 2048-channel, 32-highway time-slot interchanger 25 lucent technologies inc. low-latency and frame-integrity modes transmit time slots can be selected for low-latency (minimum delay) or for frame-integrity modes using the connec- tion store memory. low latency low latency causes a received time slot to be transmitted as soon as possible. this mode is useful for voice chan- nels where minimum delay through the network is desirable. if the transmit (tx) time slot is very close or before the receive (rx) time slot, then the data will be transmitted in the next frame. if a particular transmit time slot is physi- cally later in time than the receive time slot by a certain duration (time-slot separation), then the data will be trans- mitted in the current frame. the latency will be equal to the separation of the two time slots involved. the maximum latency that data can encounter through the tsi in low-latency mode is 134 m s. if this latency is sufficient for a par- ticular application, disregard any of the following details. the required separation that will cause the time slot to be transmitted in the current frame is as follows: the tx time-slot position in the physical frame must be greater than or equal to the rx time-slot position in the physical frame, by a duration of 2 rx time slots + (4 + i) x 30.5176 ns, where i is the tx highway number. when rx and tx highway data rates are equal and the rx and tx highway offsets are set to zero, the following table shows the result of the above relationship for various tx highways. table 8. time-slot separation required for transmission with minimum latency (0 offsets) for example: n if data is received in time slot 0 at 2.048 mbits/s, it could be passed through the device with minimum latency if transmitted on time slot 3 at 2.048 mbits/s of txd0. n if data is received in time slot 1 at 4.096 mbits/s, it could be passed through the device with minimum latency if transmitted on time slot 4 at 4.096 mbits/s of txd8. n if data is received in time slot 2 at 8.192 mbits/s, it could be passed through the device with minimum latency if transmitted on time slot 6 at 8.192 mbits/s of txd31. if the rx highway has an offset, then the relationship can be updated. the rx_time-slot_position is defined as the rx_time-slot_number + rx_highway offset. the new relationship will determine the transmit time-slot position in the physical frame at which the received data can be transmitted with minimum delay. the new relationship is (i = tx highway number) : tx_time-slot_position 3 rx_time-slot_number + rx highway offset + 2 rx time slots + (4 + i) x 30.5176 ns if the tx highway also has an offset, then the relationship becomes (i = tx highway number): tx_time-slot_number + tx highway offset 3 rx_time-slot_number + rx highway offset + 2 rx time slots + (4 + i) x 30.5176 ns rx highway data rate (mbits/s) tx highway data rate (mbits/s) time-slot (ts) separation required for transmission in current frame on highway txd0 txd4 txd8 txd15 txd31 2.048 2.048 2 ts, 1/4 bit 2 ts, 1/2 bit 2 ts, 3/4 bit 2 ts, 1 1/4 bits 2 ts, 2 1/4 bits 4.096 4.096 2 ts, 1/2 bit 2 ts, 1 bit 2 ts, 1 1/2 bits 2 ts, 2 1/2 bits 2 ts, 4 1/2 bits 8.192 8.192 2 ts, 1 bit 2 ts, 2 bits 2 ts, 3 bits 2 ts, 4 3/4 bits 3 ts, 3/4 bits
TTSI2K32T preliminary data sheet 2048-channel, 32-highway time-slot interchanger february 1999 26 lucent technologies inc. low-latency and frame-integrity modes (continued) low latency (continued) for example, consider any rx highway running at 4.096 mbits/s using time slot 5 to receive data, with an rx high- way offset of 3 time slots. it is to be transmitted on txd6. the right hand side of the relationship evaluates to: 5 time slots @ 4.096 mbits/s + 3 time slots @ 4.096 mbits/s + 2 time slots @ 4.096 mbits/s + (4 + 6 ) x 30.5176 ns 19,836.426 ns the results of the calculation show that the received data can be transmitted with minimum delay using a tx time slot located 19,836.426 ns (or later) into the physical frame on txd6. with a zero offset on txd6, the time-slot number for transmission with minimum delay would be: tx time slot 21 @ 8.192 mbits/s tx time slot 11 @ 4.096 mbits/s tx time slot 6 @ 2.048 mbits/s frame integrity frame integrity is applied to multiple transmit time slots in order to force data received in the same frame to be transmitted together in a subsequent frame. this rule causes added delay, but it is useful for wideband data. such data could be isdn bri (2b channels) that take up two time slots on a receive highway. it could also be an isdn h0 channel (six contiguous time slots) that is being used to carry video. the maximum latency through the device for any time slot marked for frame integrity mode is 378 m s. if that latency is sufficient for a particular application, disregard any of the following details. to understand the latency involved with frame-integrity mode, consider the following information. the definition of frame integrity states that integrity is maintained between a particular rx and tx highway pair. this pair can be made up of any rx highway and any tx highway. latency due to frame integrity mode is a function of the highway offsets of the rx and tx pair rather than the rela- tive position of the time slots. latency in this mode will be expressed in terms of physical frames. whether time slots received in virtual rx frame n will end up going out in virtual tx frame n + 1, n + 2, or n + 3 is dependent on the relative highway rx and tx highway offsets. for a description of virtual frames, see figure 10, virtual and physical frames on page 22. consider the following example. assume rxd0 is switched to txd1 with all tx time slots marked for frame integ- rity (fi) on txd1. if it is desirable to have the lowest possible latency for the data received on rxd0, then txd1 must have a highway offset which is 3.90625 m s (1 time slot @ 2.048 mbits/s) greater than the highway offset selected for rxd0. in that case, time slots received in the virtual rx frame (frame n) will be transmitted in the next virtual tx frame (frame n + 1). the greatest latency will be incurred when the rxd0 offset is at least 121.09375 m s (31 time slots @ 2.048 mbits/s) greater than the offset selected for txd1. in that case, time slots received in the current virtual rx frame (frame n) will be transmitted three frames later, i.e., in virtual tx frame n + 3. for all other rxd0 and txd1 offset values, time slots received in the current virtual rx frame will be transmitted two frames later, i.e., in virtual tx frame n + 2.
preliminary data sheet TTSI2K32T february 1999 2048-channel, 32-highway time-slot interchanger 27 lucent technologies inc. low-latency and frame-integrity modes (continued) frame integrity (continued) the range of rx and tx offsets can be independently selected from 0 m s to (125 C d)m s via the rx and tx highway configuration registers, bytes 0 and 1, where d = 1/4 bit. the offset difference (tx highway offset C rx highway off- set) can therefore take the range from - (125 C d)m s to +(125 C d)m s. the table below shows the virtual frame for transmission for the various cases of offset difference. table 9. offset difference and its effect on frame for transmission * the values for a, b, c, and d are specified in table 10 below. table 10. offset difference boundaries table 9 and table 10 can be used to determine the latency of time slots through the tsi in a frame integrity situa- tion. keep in mind that the offset difference is the major factor in determining which virtual tx frame the time slots will go out in. the boundary values given in table 10 are accurate to within 1 time slot @ 8.192 mbits/s (= 4 bits @ 4.096 mbits/s = 2 bits @ 2.048 mbits/s) and will depend on your particular register settings. this example can be used to determine the latency of a frame integrity situation. keep in mind that only the tx and rx highway offsets are relevant when determining the number of physical frames that the transmit data will incur. however, there is a small range of offset separation where the data will go out in either virtual tx frame n + 2 or n + 3, depending on the actual rx and tx offsets chosen. there may be many rx/tx highway pairs performing frame integrity simultaneously, but the definition of frame integrity states that integrity is maintained between each rx and tx pair and not across multiple receive highways. however, in practice, if a tx highway contains fi time slots from multiple rx highways and those rx highways have the same highway offset, then all of the fi time slots will incur equal delay with frame integrity through the switch. offset difference = (tx highway offset C rx highway offset) virtual frame for transmission a offset difference < b* n + 3 b offset difference < c* n + 2 c offset difference d* n + 1 offset difference boundary boundary value ( m s) boundary value in terms of time slots (ts) and bits, at different data rates 2.048 mbits/s 4.096 mbits/s 8.192 mbits/s a - (125 - d ) - (31 ts, 7 3/4 bits) - (63 ts, 7 3/4 bits) - (127 ts, 7 3/4 bits) b - 121.09375 - 31 ts - 62 ts - 124 ts c + 3.90625 1 ts 2 ts 4 ts d + (125 - d ) 31 ts, 7 3/4 bits 63 ts, 7 3/4 bits 127 ts, 7 3/4 bits
TTSI2K32T preliminary data sheet 2048-channel, 32-highway time-slot interchanger february 1999 28 lucent technologies inc. low-latency and frame-integrity modes (continued) frame integrity (continued) in the example shown below in figure 13, a receive and transmit highway are both running at 2.048 mbits/s. there are 32 time slots for each 125 m s frame. the rx and tx highway offsets are zero. this makes the offset difference zero. therefore, time slots selected for fi will be transmitted two frames later. the tsi is configured to perform the following switching function: tx time slot 31 is sourced from rx time slot 0 in low-latency mode. it goes out in frame n. tx time slot 2 is sourced from rx time slot 2 in low-latency mode. it goes out in frame n + 1. tx time slot 30 is source from rx time slot 1 in frame-integrity mode. it goes out in frame n + 2. tx time slot 0 is sourced from rx time slot 3 in frame-integrity mode. it goes out in frame n + 2. 5-7075(f)r.1 figure 13. mixed low-latency and frame-integrity modes a 2 z 1 b 0 a 1 c 0 e 1 e 2 e 0 b 1 b 2 b 3 b 29 b 30 b 31 b 0 c 1 c 2 c 3 c 29 c 30 c 31 c 0 c 2 d 1 d 2 d 0 z 3 a 3 b 3 c 3 d 2 b 2 d 3 d 29 d 30 d 31 d 0 b 1 frame b frame c frame d frame e r x highway t x highway fsync
preliminary data sheet TTSI2K32T february 1999 2048-channel, 32-highway time-slot interchanger 29 lucent technologies inc. test-pattern generation test-pattern generation involves selecting outgoing time slots on a particular transmit highway for use in transmit- ting one of 15 patterns of data. the patterns available are selected using tps[30] (bits 74) of the test-pattern style register (0x0a), table 25 on page 44. the transmit highway and time slots involved are selected using the connection store. using the connection store, time slots can be set for test-pattern mode and the on-chip test-pattern generator will be the source for that transmitted data. the type of test pattern used is determined by the values in the test-pat- tern style register (0x0a), table 25 on page 44. test-pattern data can be applied to any number of time slots on only one highway at a time. any highway may be selected to transmit test-pattern data. the only restrictions for selecting the time slots set for test-pattern mode are that the time slots must be from the same highway and they must be contiguous. the sequence for enabling test-pattern generation is as follows: 1. set tsdsm[20] (bits 75) in byte 1 of the connection store locations which correspond to the time slots involved in test-pattern substitution mode. any range of time slots may be selected for test-pattern substitution mode, starting at any time-slot position. the remaining time slots of that highway will be unaffected. 2. set tps[30] (bits 74) of the test-pattern style register (0x0a), table 25 on page 44 to select the test pat- tern to be sent. if a fixed user-defined byte is selected for transmission via the tps[30] bits, then the test- pattern generator data register (0x12), table 33 on page 46 must also be programmed. 3. select the data rate of the test-pattern generator via genhdr[10] (bits 54) and set sttpg (bit 7) to 1 in the test command register (0x09), table 24 on page 43 to start transmitting a good test pattern on the selected time slots. in order for data to be transmitted, highways need to be enabled using xe (bit 2) of the transmit highway configu- ration register (byte 2) (0x1002 + 4i), table 37 on page 48 and gxe (bit 0) of the general command register (0x00), table 15 on page 38. this can be done before or after the above sequence. the tx highway that has been selected for test-pattern generation must be the only highway that has time slots selected for test-pattern substitution mode (i.e., tsdsm[20] = 110) in the connection store. no time slots on any other tx highway may be selected for test-pattern substitution mode. if the tx highway selected for test-pattern generation is changed, then the previous highway must have all its time slots that were in the tsdsm[20] = 110 mode, to be changed to a non-test-pattern substitution mode. test-pattern checking test-pattern checking involves selecting incoming time slots on a particular receive highway for reception of one of 15 test patterns. the patterns available are selected by setting cps[30] (bits 30) of the test-pattern style register (0x0a), table 25 on page 44. the input highway and time slots involved are selected using the following registers: n test-pattern checker highway register (0x0b), table 26 on page 45 n test-pattern checker upper time-slot register (0x0c), table 27 on page 45 n test-pattern checker lower time-slot register (0x0d), table 28 on page 45 test-pattern data can be checked on any number of time slots on only one highway at a time. any receive highway may be selected to check for test-pattern data. the only restriction on selecting the time slots set for test- pattern checking is that the time slots must be from the same highway and they must be contiguous. the sequence for enabling test-pattern checking is as follows: 1. set test-pattern checker highway register (0x0b), table 26 on page 45 to select a highway for receiving the test data.
TTSI2K32T preliminary data sheet 2048-channel, 32-highway time-slot interchanger february 1999 30 lucent technologies inc. test-pattern checking (continued) 2. set the test-pattern checker upper time-slot register (0x0c), table 27 on page 45 and the test-pattern checker lower time-slot register (0x0d), table 28 on page 45 to indicate the range of input time slots which will be carrying test data. the range is inclusive of the time slots indicated in both registers. if only one time slot is to be selected, then the upper and lower registers should be set to the same value. 3. set cps[30] (bits 30) of the test-pattern style register (0x0a), table 25 on page 44 to select the test pat- tern to detect. if a fixed, user-defined byte is to be detected, the ctp[70] bits in the test-pattern checker data register (0x0e), table 29 on page 45 should also be programmed with the user-defined pattern. 4. select the data rate of the test-pattern checker via chkhdr[10] (bits 32) and set sttpc (bit 6) in the test command register (0x09), table 24 on page 43 to prompt the checker to attempt to lock onto the selected test-pattern style. if there is a need to restart the checker (i.e., the test-pattern style has changed), then sttpc (bit 6) of the test command register (0x09), table 24 on page 43 must first be cleared to 0, and then steps 3 and 4 should be repeated. there is an interrupt register status bit related to the test-pattern checker. tpd (bit 5) of the interrupt status regis- ter (0x07), table 22 on page 41 is used to determine when, if ever, the pattern is detected. the tpd interrupt status bit will remain 0 until the pattern has been detected. this bit is cleared when read. once tpd is set, it will not be set again until the checker is instructed to relock on the test pattern by clearing and then setting sttpc (bit 6) in the test command register. error injection the error injection feature provides the capability to inject errors into the outgoing test-pattern data. the number of errors injected is set using the test-pattern error injection register (0x0f), table 30 on page 45. if error injection is required, the process should start by setting up the test-pattern generator using steps 13 in the test-pattern generation section on page 29. in order to start injecting errors into the outgoing test pattern, write the test-pattern error injection register (0x0f), table 30 on page 45 with the number of errors desired. when all of the errors have been injected into the outgoing data stream, the interrupt status bit bei (bit 0) will be set in the interrupt status register (0x07), table 22 on page 41. errors will be injected at the rate of one per time slot. test command register (0x09), table 24 on page 43 will be cleared to 0 when bei is set. error checking errors are checked on time slots marked for test-pattern data once the checker has locked onto the test pattern. every time an error is detected, the erd (bit 3) interrupt status bit is set and the test-pattern error counter register contents are incremented. there are two registers test-pattern error counter (byte 0) (0x10), table 31 on page 46 and test-pattern error counter (byte 1) (0x11), table 32 on page 46, that are used to track the number of errors detected on incoming test patterns. the error counter registers are reset after both have been read. in order to ensure that the correct value is read from these registers, byte 0 must be read first followed by byte 1. this action will latch the counter value and allow the counter logic to be reset and then continue recording.
preliminary data sheet TTSI2K32T february 1999 2048-channel, 32-highway time-slot interchanger 31 lucent technologies inc. jtag boundary-scan specification principle of the boundary scan the boundary scan (bs) is a test aid for chip, module, and system testing. the key aspects of bs are as follows: 1. testing the connections between ics on a particular board. 2. observation of signals to the ic pins during normal operating functions. 3. controlling the built-in self-test (bist) of an ic. TTSI2K32T does not support bs-bist. designed according to the ieee std. 1149.1-1990 standard, the bs test logic consists of a defined interface: the test access port (tap). the tap is made up of four signal pins assigned solely for test purposes. the fifth test pin ensures that the test logic is initialized asynchronously. the bs test logic also comprises a 16-state tap controller, an instruction register with a decoder, and several test data registers (bs register, bypass register, and idcode register). the main component is the bs register that links all the chip pins to a shift register by means of special logic cells. the test logic is designed in such a way that it is operated independently of the application logic of the TTSI2K32T (the mode multiplexer of the bs output cells may be shared). figure 14 illustrates the block diagram of the TTSI2K32Ts bs test logic. 5-3923(f)r.4 figure 14. block diagram of the TTSI2K32T's boundary-scan test logic boundary-scan register tdi trst tms tck tap controller instruction decoder out tdo in mux chip kernel (unaffected by boundary-scan test) idcode register bypass register instruction register
TTSI2K32T preliminary data sheet 2048-channel, 32-highway time-slot interchanger february 1999 32 lucent technologies inc. jtag boundary-scan specification (continued) test access port controller the test access port controller is a synchronous sequence controller with 16 states. the state changes are preset by the tms, tck, and trst signals and by the previous state. the state changes always take place when the tck edge rises. figure 15 shows the tap controller state diagram. 5-3924(f)r.5 figure 15. bs tap controller state diagram the value shown next to each state transition in figure 15 represents the signal present at tms at the time of a ris- ing edge at tck. the description of the tap controller states is given in ieee std. 1149.1-1990 section 5.1.2 and is reproduced in table 11 and table 12. select dr capture dr 1 0 0 1 1 shift dr exit1 dr pause dr 0 1 exit2 dr update dr 1 10 0 0 0 test logic reset run test/ idle 1 0 select ir capture ir 1 0 0 1 1 shift ir exit1 ir pau s e i r 0 1 exit2 ir update ir 1 10 0 0 0 trst = 0 0 1 1
preliminary data sheet TTSI2K32T february 1999 2048-channel, 32-highway time-slot interchanger 33 lucent technologies inc. jtag boundary-scan specification (continued) test access port controller (continued) table 11. tap controller states in the data register branch table 12. tap controller states in the instruction register branch name description test logic reset the bs logic is switched in such a way that normal operation of the asic is adjusted. the idcode instruction is initialized by test logic reset. irrespective of the initial state, the tap controller has achieved test logic reset after five control pulses at the latest when tms = 1. the tap controller then remains in this state. this state is also achieved when trst = 0. run test/idle using the appropriate instructions, this state can activate circuit parts or initiate a test. all of the registers remain in their present state if other instructions are used. select dr this state is used for branching to the test data register control. capture dr the test data is loaded in the test data register parallel to the rising edge of tck in this state. shift dr the test data is clocked by the test data register serially to the rising edge of tck in the state. the tdo output driver is active. exit (1/2) dr this temporary state causes a branch to a subsequent state. pause dr the input and output of test data can be interrupted in this state. update dr the test data is clocked into the second stage of the test data register parallel to the falling edge of tck in this state. name description select ir this state is used for branching to the instruction register control. capture ir the instruction code 0001 is loaded in the first stage of the instruction register parallel to the rising edge of tck in this state. shift ir the instructions are clocked into the instruction register serially to the rising edge of tck in the state. the tdo output driver is active. exit (1/2) ir this temporary state causes a branch to a subsequent state. pause ir the input and output of instructions can be interrupted in this state. update ir the instruction is clocked into the second stage of the instruction register parallel to the falling edge of tck in this state.
TTSI2K32T preliminary data sheet 2048-channel, 32-highway time-slot interchanger february 1999 34 lucent technologies inc. jtag boundary-scan specification (continued) instruction register the instruction register (ir) is 4 bits in length. table 13 shows the bs instructions implemented by the TTSI2K32T. table 13. TTSI2K32Ts boundary-scan instructions the instructions not supported in TTSI2K32T are intest, runbist, and toggle. a fixed binary 0001 pattern (the 1 into the least significant bit) is loaded into the ir in the capture ir controller state. the idcode instruc- tion (binary 0001) is loaded into the ir during the test-logic-reset controller state and at powerup. the following is an explanation of the instructions supported by TTSI2K32T and their effect on the devices' pins. extest: this instruction enables the path cells, the pins of the ics, and the connections between asics to be tested via the circuit board. the test data can be loaded in the chosen position of the bs register by means of the sample/pre- load instruction. the extest instruction selects the bs register as the test data register. the data at the function inputs is clocked into the bs register on the rising edge of tck in the capture dr state. the contents of the bs register can be clocked out via tdo in the shift dr state. the value of the function outputs is solely determined by the contents of the data clocked into the bs register and only changes in the update dr state on the falling edge of tck. idcode: information regarding the manufacturers id for lucent, the ic number, and the version number can be read out serially by means of the idcode instruction. the idcode register is selected, and the bs register is set to normal mode in the update ir state. the idcode is loaded at the rising edge of tck in the capture dr state. the idcode register is read out via tdo in the shift dr state. highz: all 3-statable outputs are forced to a high-impedance state, and all bidirectional ports are forced to an input state by means of the highz instruction. the impedance of the outputs is set to high in the update ir state. the func- tion outputs are only determined in accordance with another instruction if a different instruction becomes active in the update ir state. the bypass register is selected as the test data register. the highz instruction is imple- mented in a similar manner to that used for the bypass instruction. sample/preload: the sample/preload instruction enables all the input and output pins to be sampled during operation (sam- ple) and the result to be output via the shift chain. this instruction does not impair the internal logic functions. defined values can be serially loaded in the bs cells via tdi while the data is being output (preload). instruction code act. register tdi ? tdo mode function output defined via extest 0000 boundary scan test test external connections bs register idcode 0001 identification normal read manuf. register core logic highz 0100 bypass x 3-state outputhigh impedance sample/preload 0101 boundary scan normal sample/load core logic bypass 1111 bypass normal min shift path core logic everything else bypass x outputhigh impedance
preliminary data sheet TTSI2K32T february 1999 2048-channel, 32-highway time-slot interchanger 35 lucent technologies inc. jtag boundary-scan specification (continued) instruction register (continued) bypass: this instruction selects the bypass register. a minimal shift path exists between tdi and tdo. the bypass reg- ister is selected after the update ir. the bs register is in normal mode. a 0 is clocked into the bypass register during capture dr state. data can be shifted by the bypass register during shift dr. the contents of the bs register do not change in the update dr state. please note that a 0 that was loaded during capture dr appears first when the data is being read out. boundary-scan register the boundary-scan register is a shift register, whereby one or more bs cells are assigned to every digital TTSI2K32T pin. the TTSI2K32Ts boundary-scan register bit-to-pin assignment is defined in the bsdl file, which is available upon request. bypass register the bypass register is a one-stage shift register that enables the shift chain to be reduced to one stage in the TTSI2K32T. idcode register the idcode register identifies the TTSI2K32T by means of a parallel, loadable, 32-bit shift register. the code is loaded on the rising edge of tck in the capture dr state. the contents of this register is indicated in the bsdl file. 3-state procedures the 3-state input participates in the boundary scan. it has a bs cell, but buffer blocking via this input is suppressed for the extest instruction. the 3-state input is regarded as a signal input that is to participate in the connection test during extest. the buffer blocking function should not be active during extest to ensure that the update pattern at the TTSI2K32T outputs does not become corrupted.
TTSI2K32T preliminary data sheet 2048-channel, 32-highway time-slot interchanger february 1999 36 lucent technologies inc. register architecture table 14 is an overview of the register architecture. the table is a summary of the register function and address. complete detail of each register is given in the following sections. table 14. TTSI2K32T register summary register name/function register address (hex) reserved 60007fff connection store memory 40005fff reserved 30003fff data store memory 20002fff reserved 18801fff receive highway 31reserved 187f receive highway 31 configuration byte 2 187e receive highway 31 configuration byte 1 187d receive highway 31 configuration byte 0 187c . . . . . . receive highway 0reserved 1803 receive highway 0 configuration byte 2 1802 receive highway 0 configuration byte 1 1801 receive highway 0 configuration byte 0 1800 reserved 108017ff transmit highway 31reserved 107f transmit highway 31 configuration byte 2 107e transmit highway 31 configuration byte 1 107d transmit highway 31 configuration byte 0 107c . . . . . . transmit highway 0reserved 1003 transmit highway 0 configuration byte 2 1002 transmit highway 0 configuration byte 1 1001 transmit highway 0 configuration byte 0 1000 reserved 00140fff version register 0013 test-pattern generator data register 0012 test-pattern error counter byte 1 0011 test-pattern error counter byte 0 0010
preliminary data sheet TTSI2K32T february 1999 2048-channel, 32-highway time-slot interchanger 37 lucent technologies inc. register architecture (continued) table 14. TTSI2K32T register summary (continued) register name/function register address (hex) test-pattern error injection register 000f test-pattern checker data register 000e test-pattern checker lower time-slot register 000d test-pattern checker upper time-slot register 000c test-pattern checker highway register 000b test-pattern style register 000a test command register 0009 interrupt mask register 0008 interrupt status register 0007 global interrupt mask register 0006 idle code 3 register 0005 idle code 2 register 0004 idle code 1 register 0003 bist command register 0002 software reset register 0001 general command register 0000
TTSI2K32T preliminary data sheet 2048-channel, 32-highway time-slot interchanger february 1999 38 lucent technologies inc. configuration register architecture note : all registers bits default to 0 upon reset, unless noted otherwise. all tdm highway data, which is stored in the tsi, will have the following convention. bit 7 is first transmitted and first received; bit zero is last transmitted and last received. this convention applies to the data read from the data store, the host data transmitted via the connection store, and any other configuration register which stores highway data, such as the idle code registers and the test-pattern generator data register. table 15. general command register (0x00) bit symbol name/description 7csv chip select valid. this bit is valid while the TTSI2K32T is in synchronous micropro- cessor interface mode only. when this bit is programmed to be 1, the chip select input pin is sampled when as is active. when 0, chip select is latched one pclk after as is active. 6ed external drivers. used to select the use of external drivers on transmit highways. a 0 indicates that no external buffers are being used; therefore, the txd pins will become 3-stated for time slots that are programmed as such. a 1 indicates that the txd output highways are connected to external drivers; thus, the txd pins will always be driven to prevent floating nodes at the inputs of the external drivers. the txoe[031] out- puts always reflect the high-impedance status of the corresponding txd[031] high- ways, regardless of the ed bit setting. the only exception to this is when test is asserted, which 3-states all outputs. see table 41, transmit highway 3-state options, on page 51 for other methods of 3-stating the transmit highways. 5 reserved. read as 0. 4intoe interrupt output enable. this bit, when set to a 1, enables the int output signal to be driven based on the status of the internal interrupts and their corresponding individ- ual mask bits. when 0, the output will remain 3-stated. 3intp interrupt polarity. this bit defines the polarity of int, as output from the TTSI2K32T. a 1 selects an active-low interrupt output (int ). a 0 selects an active-high interrupt output (int), and is the default polarity. 2fsp frame sync polarity. this bit defines the polarity of fsync, as sampled by ck, which designates the beginning of the frame. a 1 selects an active-high frame syn- chronization (fsync). a 0 selects an active-low frame synchronization (fsync ). 1fsse frame sync sample edge. this bit selects the clock edge of the ck input that is used to sample the frame synchronization input. a 1 selects the rising edge; and a 0 selects the falling edge of ck. 0gxe global transmit enable. when 0, all 32 transmit highways are 3-stated. gxe defaults to 0 so that all outputs can be held in a high-impedance state until they have been configured and individually enabled. for other methods of 3-stating transmit highways, see table 41, transmit highway 3-state options, on page 51.
preliminary data sheet TTSI2K32T february 1999 2048-channel, 32-highway time-slot interchanger 39 lucent technologies inc. configuration register architecture (continued) table 16. software reset register (0x01) table 17. bist command register (0x02) the bist test sequence is performed as follows: 1. set rb (bit 7) in the bist command register to 1 in order to initiate the internal bist test. 2. wait for the bist complete (bc) (bit 1 of the interrupt status register) interrupt to occur via the interrupt status register, if it is not masked via the interrupt mask register maskbc bit (bit 1). alternatively, the host can poll the bd bit in the bist command register which will also indicate the completion of bist. 3. once the bist interrupt occurs or the bd bit is set, the bpf bit in the bist command register will reflect the bist pass/fail result. a bpf set to 0 indicates a pass. 4. set rb (bit 7) in the bist command register to a 0 in order to end the internal bist test. 5. issue a software reset via the sr bit in the software reset register. during bist, the TTSI2K32T will corrupt traffic and the contents of the connection store memory. the TTSI2K32T should, therefore, be taken off-line prior to running bist and reprogrammed afterwards. bit symbol name/description 71 reserved. read as 0. 0sr software reset. writing a 1 to this bit resets the chip. this bit has a function similar to the reset pin. when set to 1, all registers and control logic will be ini- tialized to their default values except the software reset register. a 0 must be written to this bit in order to clear and release the software reset. the micropro- cessor interface will not be affected by the software reset, and the write to this bit will terminate normally. bit symbol name/description 7rb run bist. writing a 1 to this bit begins the built-in self-test for all internal mem- ory blocks (i.e., the data and connection stores). this bit must be cleared by writ- ing a 0 when bist is complete. that event is indicated via the bist complete (bc) bit in the interrupt status register, as well as the bist done (bd) bit in the bist command register. writing a 0 to this bit position will also clear the bd bit. a software reset should be performed after the bist testing sequence is complete. 6bd bist done (read only). this bit indicates when the bist test is complete. this bit is used for polling to determine the completion of the bist test. the real-time duration of the tsi bist test is 2.8 seconds. this bit will remain set to a 1 reflect- ing the fact that the bist is complete until the rb bit is written to a 0. 5 bpf bist pass /fail (read only). this bit indicates the status of the bist test results. a 0 indicates that no errors were detected. 40 reserved. read as 0.
TTSI2K32T preliminary data sheet 2048-channel, 32-highway time-slot interchanger february 1999 40 lucent technologies inc. configuration register architecture (continued) table 18. idle code 1 register (0x03) table 19. idle code 2 register (0x04) table 20. idle code 3 register (0x05) table 21. global interrupt mask register (0x06) bit symbol name/description 70 ic1 idle code 1[7 0]. this register is used to identify the data to be sent on any outgoing time slot marked for idle code 1 transmission. idle code transmission is enabled via the time-slot data select mode bits. see table 45, connection store memory (byte 1), on page 53. bit symbol name/description 70 ic2 idle code 2[7 0]. this register is used to identify the data to be sent on any outgoing time slot marked for idle code 2 transmission. idle code transmission is enabled via the time-slot data select mode bits. see table 45, connection store memory (byte 1), on page 53. bit symbol name/description 70 ic3 idle code 3[7 0]. this register is used to identify the data to be sent on any outgoing time slot marked for idle code 3 transmission. idle code transmission is enabled via the time-slot data select mode bits. see table 45, connection store memory (byte 1), on page 53. bit symbol name/description 71 reserved. read as 0. 0gie global interrupt enable. this bit must be written to a 1 in order for int to be asserted as a result of the possible interrupt conditions. this is in addition to the mask bits in the interrupt mask register. when 0, the int output is blocked independent of the programming of the interrupt mask register. when 1, the int output is enabled and will be asserted based on the interrupt status and mask bits.
preliminary data sheet TTSI2K32T february 1999 2048-channel, 32-highway time-slot interchanger 41 lucent technologies inc. configuration register architecture (continued) table 22. interrupt status register * (0x07) * read-only register. this register is clear on read. once the status bits are read, they will remain cleared until the next interrupt event occurs. the interrupt mask register in combination with the global interrupt enable gie (bit 0) in the global interrupt mask register determines when the int pin gets asserted when an interrupt status bit gets set. in general, the interrupt status register bits will update regardless of the mask bits. the exception to this is the fserr bit, which will not be set if the corresponding mask bit is set. bit symbol name/description 7 reserved. read as 0. 6fserr frame sync error. when set to 1, this bit indicates that an error related to frame sync has occurred. this error could be a result of a missing fsync or a mis- aligned fsync. 5tpd test pattern detected. the tpd bit indicates the state of the test-pattern checker. when tpd = 0, the test-pattern checker has not yet located the selected test pattern. when tpd = 1, the test-pattern checker has located the selected test pattern. test-pattern data must be error-free for 32 time slots before it is considered detected. if 32 or more time slots are selected for test-pattern checking, this event could occur within one 125 m s frame. if only two time slots are selected for test-pattern checking, then the test pattern will be detected after 16 frames. 4 reserved. read as 0 or 1. 3erd error detected. this bit is set to 1 each time an error has been detected in the test pattern once the test pattern has first been detected. 2 reserved. read as 0. 1bc bist complete. when set to 1, this status bit indicates that the bist sequence is complete. 0bei bit errors inserted. when set to 1, this status bit indicates that the request to insert bit errors into the outgoing test pattern is complete.
TTSI2K32T preliminary data sheet 2048-channel, 32-highway time-slot interchanger february 1999 42 lucent technologies inc. configuration register architecture (continued) table 23. interrupt mask register (0x08) bit symbol name/description 7 reserved. read as 0. 6 maskfs mask frame sync error interrupt. set this bit to a 1 to mask the generation of an interrupt as a result of a frame sync error. resets to a 1, which prevents the status bit from generating an interrupt. setting this bit to a 1 also prevents the detection of a frame sync error and, thus, the setting of the fserr bit in the interrupt status register. this is done to prevent an unintended interrupt at the first fsync pulse after the reset sequence. 5 masktpd mask test-pattern detection interrupt. set this bit to a 1 to mask the genera- tion of an interrupt as a result of a test-pattern detection. resets to a 1, which prevents the status bit from generating an interrupt. 4 reserved. read as 1. always write a 1 to this bit when writing this register. 3 maskerd mask error detected interrupt. set this bit to a 1 to mask the generation of an interrupt as a result of a single bit error detected in the incoming test pattern. resets to a 1, which prevents the status bit from generating an interrupt. 2 reserved. read as 1. always write a 1 to this bit when writing this register. 1 maskbc mask bist complete interrupt. set this bit to a 1 to mask the generation of an interrupt as a result of completing the memory bist. resets to a 1, which pre- vents the status bit from generating an interrupt. 0 maskbei mask bit errors inserted interrupt. set this bit to a 1 to mask the generation of an interrupt as a result of completing the insertion of all requested bit errors. resets to a 1, which prevents the status bit from generating an interrupt.
preliminary data sheet TTSI2K32T february 1999 2048-channel, 32-highway time-slot interchanger 43 lucent technologies inc. configuration register architecture (continued) table 24. test command register (0x09) bit symbol name/description 7 sttpg start test-pattern generator. writing a 1 to this register will cause the genera- tor to start generating a test pattern based on the pattern indicated in the test- pattern style register. writing a 0 to this register will stop the test-pattern genera- tion and provide the opportunity to change the test-pattern style. 6sttpc start test-pattern checker. writing a 1 to this register will cause the checker to start locking on to a test pattern based on the pattern indicated in the test- pattern style register. writing a 0 to this register will stop the test-pattern check- ing and provide the opportunity to change the test-pattern style. 54 genhdr [10] test-pattern generator highway data rate. these bits are used to indicate the highway data rate of the transmit highway selected for test-pattern genera- tion. it must match the tx highway data rate which was set in transmit highway configuration register (byte 2), hdr[10] bits. the transmit highway selection for test-pattern generation is done using the connection store. only one highway at a time can be involved with test-pattern generation. test-pattern generation and checking does not affect the operation of other time slots or highways. genhdr1 genhdr0 0 0 2.048 mbits/s (default) 0 1 4.096 mbits/s 1 0 8.192 mbits/s 1 1 0.000 mbits/s (idle, not transmitting data) 32 chkhdr [10] test-pattern checker highway data rate. these bits are used to indicate the highway data rate of the receive highway selected for test-pattern checking. it must match the rx highway data rate which was set in receive highway configu- ration register (byte 2), hdr[10] bits. the transmit highway selection for test- pattern generation is done using the test-pattern checker highway register. only one highway at a time can be involved with test-pattern checking. test-pattern generation and checking does not affect the operation of other time slots or high- ways. chkhdr1 chkhdr0 0 0 2.048 mbits/s (default) 0 1 4.096 mbits/s 1 0 8.192 mbits/s 1 1 0.000 mbits/s (idle, not receiving data) 10 reserved. read as 0.
TTSI2K32T preliminary data sheet 2048-channel, 32-highway time-slot interchanger february 1999 44 lucent technologies inc. configuration register architecture (continued) table 25. test-pattern style register (0x0a) bit symbol name/description 74 tps[30] generator test-pattern style[3 0]. these 4 bits determine the type of test pattern that will be generated by the on-line maintenance test-pattern generator. tps3 tps2 tps1 tps0 test-pattern description 0000mark (all 1s)(ais - red alarm) 0001qrss (2 20 C 1 with zero suppression) (o.151) 001031(2 5 C 1) prbs 001163(2 6 C 1) prbs 0100511(2 9 C 1) prbs (o.153) 0101511(2 9 C 1) prbs (reversed) 01102047(2 11 C 1) prbs (o.152) 01112047(2 11 C 1) prbs (reversed) 10002 15 C 1 prbs (o.151) (noninverted) 10012 20 C 1 prbs (o.153) 10102 20 C 1 prbs (reversed) 10112 23 C 1 prbs (v.33) (noninverted) 11001:1 (alternating 1s and 0s). 1101reserved. 1110reserved. 1111fixed. user-defined byte, stored in the test- pattern generator data register will be sent. prbs = pseudorandom binary sequence. qrss = quasi-random signal source. 30 cps[30] checker test-pattern style[3 0]. these 4 bits determine the type of test pattern that will be detected by the on-line maintenance test-pattern checker. cps3 cps2 cps1 cps0 test-pattern description 0000mark (all 1s) (ais - red alarm) 0001qrss (2 20 C 1 with zero suppression) (o.151) 001031(2 5 C 1) prbs 001163(2 6 C 1) prbs 0100511(2 9 C 1) prbs (o.153) 0101511(2 9 C 1) prbs (reversed) 01102047(2 11 C 1) prbs (o.152) 01112047(2 11 C 1) prbs (reversed) 10002 15 C 1 prbs (o.151) (noninverted) 10012 20 C 1 prbs (o.153) 10102 20 C 1 prbs (reversed) 10112 23 C 1 prbs (v.33) (noninverted) 11001:1 (alternating 1s and 0s). 1101reserved. 1110reserved. 1111fixed. the checker will compare against the user- defined byte, stored in the test-pattern checker data register. prbs = pseudorandom binary sequence. qrss = quasi-random signal source.
preliminary data sheet TTSI2K32T february 1999 2048-channel, 32-highway time-slot interchanger 45 lucent technologies inc. configuration register architecture (continued) table 26. test-pattern checker highway register (0x0b) table 27. test-pattern checker upper time-slot register (0x0c) table 28. test-pattern checker lower time-slot register (0x0d) table 29. test-pattern checker data register (0x0e) table 30. test-pattern error injection register (0x0f) bit symbol name/description 75 reserved. 40 chs[40] checker highway select[4 0]. these 5 bits determine the receive highway to which the test-pattern checker is connected. bit symbol name/description 7 reserved. 60 ckrup[60] checker upper time-slot select[6 0]. these 7 bits determine the upper time slot in the input highway to which the test-pattern checker is connected. all con- tiguous time slots that lie between the lower and upper time-slot boundaries inclusive are monitored for the test pattern. the range of time slots that can be monitored is from 1 time slot to the entire span (32, 64, and 128 time slots for a 2.048 mbits/s, 4.096 mbits/s, 8.192 mbits/s highway, respectively). if one time slot is to be monitored, then ckrup and ckrlow should be set to the same value. bit symbol name/description 7 reserved. 60 ckrlow [60] checker lower time-slot select[6 0]. these 7 bits determine the lower time slot in the input highway to which the test-pattern checker is connected. all con- tiguous time slots that lie between the lower and upper time-slot boundaries inclusive are monitored for the test pattern. the range of time slots that can be monitored is from 1 time slot to the entire span (32, 64, and 128 time slots for a 2.048 mbits/s, 4.096 mbits/s, 8.192 mbits/s highway, respectively). if one time slot is to be monitored, then ckrup and ckrlow should be set to the same value. bit symbol name/description 70 ctp[70] checker test pattern[7 0]. the data written here will be used for comparison when the fixed mode is programmed into the test-pattern style register. bit symbol name/description 70 bec[70] bit error count[7 0]. this register is used to indicate the number of single bit errors that are to be injected into the outgoing test pattern (qrss, prbs, or fixed user-defined byte). this register can be programmed to inject up to 255 bit errors. the bei bit in the interrupt status register will indicate when all of the errors have been injected. bec[70] will automatically be reset when bei is set. in order to send out additional errors, bec[70] should be rewritten. errors are injected at the rate of one per time slot.
TTSI2K32T preliminary data sheet 2048-channel, 32-highway time-slot interchanger february 1999 46 lucent technologies inc. configuration register architecture (continued) table 31. test-pattern error counter (byte 0) (0x10) * * read-only register. table 32. test-pattern error counter (byte 1) (0x11) * * read-only register. note: the error counter will be incremented each time a bit error is detected by the pattern checker. in order to ensure that the correct value is read from these registers, byte 0 must be read first followed by byte 1. this action will latch the error counter value and allow the counter to be reset and continue recording as time proceeds. table 33. test-pattern generator data register (0x12) table 34. version register (0x13) * * read-only register. ? reading a 00 from this register indicates version number 1.0. bit symbol name/description 70 ec[70] error counter[7 0]. least significant bits of 16-bit error counter. see note below for resetting counter. bit symbol name/description 70 ec[158] error counter[15 8]. most significant bits of 16-bit error counter. see note below for resetting counter. bit symbol name/description 70 gtp[70] generator test pattern[7 0]. the data written here will be sent out repeatedly if the fixed data test-pattern mode is selected in the test-pattern style register. bit symbol name/description 72 reserved. 10 ver[10] version number. read as 00 ? .
preliminary data sheet TTSI2K32T february 1999 2048-channel, 32-highway time-slot interchanger 47 lucent technologies inc. configuration register architecture (continued) table 35. transmit highway configuration register (byte 0) (0x1000 + 4i) * * i = the transmit highway number. bit symbol name/description 7 reserved. read as 0. 64 xbitoff [20] transmit highway bit offset[2 0]. xbitoff is used to offset the beginning of an outgoing frame by the indicated number of bit times. if no bit offsets are required, these bits should be set to 000. the following list shows the effect of setting these bits. 000 = no bit offset 001 = 1-bit offset 010 = 2-bit offset . . . 111 = 7-bit offset note: bit periods are relative to the highway data rate set for each highway. xtsoff, xbitoff, and xfboff are used in conjunction to define the start of the outgoing frame. the values are added together to position the sampling of time slot 0, bit 0 for each highway. 32 xfboff [10] transmit highway fractional bit offset[1 0]. xfboff is used to offset the beginning of an outgoing frame by the indicated number of fractional bit times. if no fractional bit offsets are required, these bits should be set to 00. the following list shows the effect of these bits. 00 = no fractional bit offset 01 = 1/4-bit fractional offset 10 = 1/2-bit fractional offset 11 = 3/4-bit fractional offset note: bit periods are relative to the highway data rate set for each highway. xtsoff, xbitoff, and xfboff are used in conjunction to define the start of the outgoing frame. the values are added together to position the sampling of time slot 0, bit 0 for each highway. 10 reserved. must be written to 00.
TTSI2K32T preliminary data sheet 2048-channel, 32-highway time-slot interchanger february 1999 48 lucent technologies inc. configuration register architecture (continued) table 36. transmit highway configuration register (byte 1) (0x1001 + 4i) * * i = the transmit highway number. table 37. transmit highway configuration register (byte 2) (0x1002 + 4i) * * i = the transmit highway number. note : during ck input interruptions (e.g., clock switching), the transmit highways should be 3-stated by clearing the gxe (bit 0) of the general command register. the highways can be enabled by writing a 1 to the gxe bit once the pll has regained lock (250 m s later). bit symbol name/description 7 reserved. read as 0. 60 xtsoff [60] transmit highway time-slot offset[6 0]. xtsoff is used to offset the beginning of an outgoing frame by the indicated number of time slots (bytes). if no time-slot offsetting is required, these bits should be set to zero. the following table shows the range of offsets for the different highway data rates. highway data rate time-slot offset range 2.048 mbits/s 031 4.096 mbits/s 063 8.192 mbits/s 0127 note: a time slot is always 8 bits. a bit period is relative to the highway data rate set for each highway. xtsoff, xbitoff, and xfboff are used in conjunction to define the start of the outgoing frame. the values are added together to position the transmission of time slot 0, bit 0. bit symbol name/description 73 reserved. read as 0. 2xe transmit highway 3-state enable . the associated output highway is high impedance when this bit is 0 (default after reset). when this bit is set to 1, the output driver is enabled. the effect of this bit is dependent on the status of the external drive bit of the general command register. see table 15, general command register (0x00), on page 38 for details. for other methods of 3-stat- ing transmit highways, see table 41, transmit highway 3-state options, on page 51. 10 hdr[10] transmit highway data rate[10]. hdr1 hdr0 0 0 2.048 mbits/s (default) 0 1 4.096 mbits/s 1 0 8.192 mbits/s 1 1 0.000 mbits/s (idle, not transmitting data) all of the transmit highways are grouped into pairs. txd0 with txd1, txd2 with txd3, . . . , and txd30 with txd31. the maximum combined bandwidth for each pair is 8.192 mbits/s. refer to table 7, tx highway data rate options, on page 20 for highway rate combination.
preliminary data sheet TTSI2K32T february 1999 2048-channel, 32-highway time-slot interchanger 49 lucent technologies inc. configuration register architecture (continued) table 38. receive highway configuration register (byte 0) (0x1800 + 4i) * * i = the receive highway number. bit symbol name/description 7 reserved. read as 0. 64 rbitoff [20] receive highway bit offset[2 0]. rbitoff is used to offset the beginning of an incoming frame by the indicated number of bit times. if no bit offsets are required, these bits should be set to 000. the following list shows the effect of setting these bits. 000 = no bit offset 001 = 1-bit offset 010 = 2-bit offset . . . 111 = 7-bit offset note: bit periods are relative to the highway data rate set for each highway. rtsoff, rbitoff, and rfboff are used in conjunction to define the start of the incoming frame. the values are added together to position the sampling of time slot 0, bit 0 for each highway. 32 rfboff [10] receive highway fractional bit offset[1 0]. rfboff is used to offset the beginning of an incoming frame by the indicated number of fractional bit times. if no fractional bit offsets are required, these bits should be set to 00. the fol- lowing list shows the effect of these bits. 00 = no fractional bit offset 01 = 1/4-bit fractional offset 10 = 1/2-bit fractional offset 11 = 3/4-bit fractional offset note: bit periods are relative to the highway data rate set for each highway. rtsoff, rbitoff, and rfboff are used in conjunction to define the start of the incoming frame. the values are added together to position the sampling of time slot 0, bit 0 for each highway. 10 reserved. (read/write) must be written to 00.
TTSI2K32T preliminary data sheet 2048-channel, 32-highway time-slot interchanger february 1999 50 lucent technologies inc. configuration register architecture (continued) table 39. receive highway configuration register (byte 1) (0x1801 + 4i) * * i = the receive highway number. table 40. receive highway configuration register (byte 2) (0x1802 + 4i) * * i = the receive highway number. bit symbol name/description 7 reserved. read as 0. 60 rtsoff [60] receive highway time-slot offset[6 0]. rtsoff is used to offset the begin- ning of an incoming frame by the indicated number of time slots (bytes). if no time-slot offsetting is required, these bits should be set to zero. the following table shows the range of offsets for the different highway data rates. highway data rate time-slot offset range 2.048 mbits/s 031 4.096 mbits/s 063 8.192 mbits/s 0127 note: a time slot is always 8 bits. a bit period is relative to the highway data rate set for each highway. rtsoff, rbitoff, and rfboff are used in conjunction to define the start of the incoming frame. the values are added together to position the sampling of time slot 0, bit 0. bit symbol name/description 73 reserved. read as 0. 2lc loopback control. this bit is used to control the internal loopback of the txd highway to the corresponding rxd highway. when set to 1, the txd highway as input to this rxd highway. the transmit highway involved will be internally looped back to the matching receive highway so that the txd[i] output is now the input to rxd[i]. when a particular highway is in this mode, the receive highway offset must be 1/2-bit greater than the corresponding transmit highway offset. when lc is cleared to 0, the rxd pin is the source of highway data (default). 10 hdr[10] receive highway data rate[10]. hdr1 hdr0 0 0 2.048 mbits/s (default) 0 1 4.096 mbits/s 1 0 8.192 mbits/s 1 1 0.000 mbits/s (idle, not receiving data) all of the receive highways are grouped into pairs. rxd0 with rxd1, rxd2 with rxd3, . . . , and rxd30 with rxd31. the maximum combined bandwidth for each pair is 8.192 mbits/s. refer to table 6, rx highway data rate options, on page 20 for highway rate combination.
preliminary data sheet TTSI2K32T february 1999 2048-channel, 32-highway time-slot interchanger 51 lucent technologies inc. configuration register architecture (continued) transmit highway 3-state options there are several ways of 3-stating the transmit highways: test (active-low) is the input pin that 3-states all outputs and bidirectional pins of the device. gxe (bit 0) (active-high) is the global transmit enable bit in the general command register. it applies to all transmit highways. xe (bit 2) (active-high) is the transmit highway 3-state enable bit in the transmit highway configuration register (byte 2). there is a separate xe bit for each one of the 32 transmit highways. ed (bit 6) (active-high) is the external drivers bit in the general command register. this bit applies to all the transmit highways. it affects the 3-stating of the transmit highways. time slots that are selected to be 3-stated, by setting the tsdsm[20] bits to 0x7 in byte 2 of the connection store, will be driven with random data if ed = 1. otherwise, these time slots will be 3-stated. table 41. transmit highway 3-state options test (input pin) gxe (cfg bit) ed (cfg bit) xe for transmit highway [i] (cfg bit) txd[031] pins txoe[031] pins 0xx x all high impedance. all high impedance. 100 x all high impedance. all 0. 101 x all driven with random data. all 0. 110 0 txd[i] = high impedance. txoe[i] = 0. 110 1 txd[i] = 0, 1, or high impedance according to connection store pro- gramming. txoe[i] = 0 or 1, representing high-imped- ance state according to connection store programming. 111 0 txd[i] is driven with random data. txoe[i] = 0. 111 1 txd[i] = 0 or 1 reflecting the correct transmit data. time slots which are selected for high-impedance mode via the connection store will be driven with random data and not 3-stated. txoe[i] = 0 or 1, representing high-imped- ance state according to connection store programming.
TTSI2K32T preliminary data sheet 2048-channel, 32-highway time-slot interchanger february 1999 52 lucent technologies inc. data store memory microprocessor access to the incoming highway data is provided by directly reading the data store memory. each one of the time slots is addressable by constructing the address in the following way . microprocessor reads to this address space will occur immediately. microprocessor writes to this address space will not change the contents of the data store. if user data is to be sent out on a particular time slot, the host data substitution mode in the connec- tion store should be used. table 42. address scheme for data store memory to illustrate the addressing scheme, consider the following examples: to read the data received in time slot 7 on rxd6, the following address is used to access the tsi data store mem- ory location. a[140] = 010_00110_0000111 = 0x2307 note: all tdm highway data which is stored in the tsi will have the following convention. the most significant bit of a byte is first transmitted and first received, the least significant bit is last transmitted and last received. this convention applies to the data read from the data store, the host data transmitted via the connection store, and any other configuration register that stores highway data. connection store memory the connection store memory is primarily used to set up the switching matrix and selects the transmit data source for each one of the outgoing time slots. there are two connection store byte locations associated with each one of the outgoing time slots. the address for each of the corresponding connection store memory locations is con- structed in the following way. table 43. address scheme for connection store memory if any particular transmit highway is not programmed to use the total available bandwidth (8.192 mbits/s), then the connection store memory locations representing the unused time slots are not used. for example, assume high- way 7 is set for a highway data rate of 4.096 mbits/s. this translates to a total of 64 time slots being transmitted on highway 7. in that case, addresses a[140] = 0x47000x477f must be set. addresses a[140] = 0x4780 0x47ff are irrelevant for a 4.096 mbits/s highway and need not be set. the connection store memory does not have a default state. therefore, after powerup, the relevant locations in the connection store must be programmed. however, the connection store contents are not affected by a software or hardware reset of the TTSI2K32T. data store memory address 14131211109876543210 0 1 0 receive highway number (031) receive time-slot address (0127) connection store memory address 1413121110987654321 0 1 0 transmit highway number (031) transmit time-slot address (0127) byte 0, 1 select
preliminary data sheet TTSI2K32T february 1999 2048-channel, 32-highway time-slot interchanger 53 lucent technologies inc. connection store memory (continued) table 44. connection store memory (byte 0) table 45. connection store memory (byte 1) to illustrate the connection store programming scheme, consider the following example: to configure the transmission of time slot 7 on txd6, the following addresses are used to access the relevant tsi connection store memory locations. a[140] = 10_00110_0000111_0 = 0x460eto access byte 0 a[140] = 10_00110_0000111_1 = 0x460fto access byte 1 now, if it is desired to send rx time slot 4 from rxd3 to time slot 7 on txd6 in frame integrity mode, then the fol- lowing data should be written to the above addresses. data byte 0 = 0_0000100 = 0x04 data byte 1 = 001_00011 = 0x23 thus, to map rx time slot 4 from rxd3 to tx time slot 7 on txd6, in frame integrity mode, the following two tsi writes must be performed. write location 0x460e with 0x04 write location 0x460f with 0x23 bit symbol name/description 70 rtsa[60]/ hsd[70] receive time-slot address[6 0]/host substituted data[7 0]. if low- latency or frame-integrity time-slot data select modes are selected for the partic- ular transmit time slot being configured, then these bits are used to indicate the receive time-slot address from which the transmit time-slot data is sourced. bit 7 should be set to 0. if the host data substitution mode is selected for the particular transmit time slot being configured, then these 8 bits will represent the data byte to be transmitted. these bits are not valid for time-slot data select modes 37. bit symbol name/description 75 tsdsm[20] time-slot data select mode[2 0] 0 0 0 low-latency mode. 0 0 1 frame-integrity mode. 0 1 0 host data substitution mode. 0 1 1 idle code 1 substitution mode. 1 0 0 idle code 2 substitution mode. 1 0 1 idle code 3 substitution mode. 1 1 0 test-pattern substitution modetest pattern is selected via test-pattern style register. 1 1 1 high-impedance mode. 40 rxhwy [40] receive highway number. used to select the receive highway from which the outgoing time-slot data is sourced. these bits are only valid for time-slot data select modes 0 and 1.
TTSI2K32T preliminary data sheet 2048-channel, 32-highway time-slot interchanger february 1999 54 lucent technologies inc. connection store memory (continued) tsdsm[50] (bits 75) of byte 1 of the connection store select the source of data for each of the time slots being transmitted by the TTSI2K32T. the configuration can be divided into three groups. group 1 low-latency mode. for the time slots marked as low latency, the transmit data will be retrieved from the data store based on the programming of tsa[60] (bits 60) of byte 0 and rxhwy[40] (bits 40) of byte 1. bit 7 of byte 0 is ignored. when each of the individual transmit time slots are retrieved from the data store memory for transmission, the most recent copy of the receive time slot will be fetched resulting in a latency that never exceeds 134 m s. this is the maximum latency for low- latency mode independent of highway configurations (e.g., highway speed, clock speed, offsets, etc.). refer to the low-latency and frame-integrity modes section on page 25 for a detailed description of the latency calculation. frame-integrity mode. for the time slots marked as frame integrity, the transmit data will be retrieved from the data store based on the programming of tsa[60] (bits 60) of byte 0 and rxhwy[40] (bits 40) of byte 1. bit 7 of byte 0 is ignored. any number of time slots from any number of transmit highways can be marked for frame integrity. when each of the individual transmit time slots marked for frame integrity are retrieved from the data-store memory for transmission, the internal controller ensures that they are chosen from a receive frame which has already been entirely stored in the data store, thereby ensuring frame integrity. refer to the low-latency and frame-integrity modes section on page 25 for a detailed description of the actual latency incurred through the device. group 2 host-data substitution mode. this mode also provides the means to transmit host-supplied data repeatedly onto any or all of the 2048 transmit time slots; however, the data to be substituted is stored in hsd[70] (bits 70) of byte 0 for each transmit time slot. rxhwy[40] (bits 40) of byte 1 are ignored in this mode. host-data mode can be used to customize the data for each of the 2048 transmit time slots. when a time slot is configured for host-data substitution mode, the data written to byte 0 of the connection store will have the following convention. bit 7 is first transmitted, and bit 0 is last trans- mitted. idle-code substitution mode. these three idle-code substitution modes provide the means to trans- mit microprocessor data repeatedly onto any or all of the 2048 transmit time slots. three idle-code reg- isters (separate from the connection store memory) provide the capability to repeatedly broadcast three different programmed values to any or all time slots set for idle-code substitution mode. when program- ming idle-code substitution mode, only the tsdsm[20] (bits 75) of byte 1 for all of the transmit time slots involved needs to be written. byte 0 and rxhwy[40] (bits 40) of byte 1 are both ignored. test-pattern substitution mode. this mode is also used to substitute alternative transmit data rather than use the receive time slots being stored in the data store. since the test-pattern selection is done outside of the connection store, only tsdsm[20] (bits 75) of byte 1 for each of the time slots involved needs to be programmed. byte 0 and rxhwy[40] (bits 40) of byte 1 are both ignored. the test-pattern selection and usage rules are described in the test-pattern generation section on page 29. group 3 high-impedance mode. this mode is used to 3-state any of the 2048 transmit time slots on an individ- ual basis. for example, consider the case where an 8.192 mbits/s highway is shared by four devices, each having one-fourth of the total bandwidth. if the TTSI2K32T were allocated time slots 6495, then high-impedance mode would be set for time slots 063 and 96127. time slots 6495 could be set to any combination of the eight possible modes. when programming the high-impedance mode, only tsdsm[20] (bits 75) of byte 1 for all of the transmit time slots involved needs to be written. con- nection store byte 0 and rxhwy[40] (bits 40) of byte 1 are both ignored.
preliminary data sheet TTSI2K32T february 1999 2048-channel, 32-highway time-slot interchanger 55 lucent technologies inc. absolute maximum ratings stresses in excess of the absolute maximum ratings can cause permanent damage to the device. these are abso- lute stress ratings only. functional operation of the device is not implied at these or any other conditions in excess of those given in the operations sections of this data sheet. exposure to absolute maximum ratings for extended periods can adversely affect device reliability. external leads can be safely soldered or bonded at temperatures up to 300 c. * this maximum rating only applies when the device is powered up with v dd . operating conditions handling precautions although protection circuitry has been designed into this device, proper precautions should be taken to avoid expo- sure to electrostatic discharge (esd) during handling and mounting. lucent employs a human-body model (hbm) and a charged-device model (cdm) for esd-susceptibility testing and protection design evaluation. esd voltage thresholds are dependent on the circuit parameters used to define the model. no industry-wide standard has been adopted for the cdm. however, a standard hbm (resistance = 1500 w , capacitance = 100 pf) is widely used and, therefore, can be used for comparison. the hbm esd threshold presented here was obtained by using these cir- cuit parameters: parameter symbol min max unit storage temperature t stg C65 125 c voltage on any pin with respect to ground v in C0.5 5.8* v power dissipation p d 440 mw parameter symbol min max unit power supply v dd 2.97 3.63 v low-level input voltage v il 0.8 v high-level input voltage v ih 2.1 5.8 v ambient operating temperature range t a C40 85 c human-body model esd threshold device voltage TTSI2K32T >1000 v
TTSI2K32T preliminary data sheet 2048-channel, 32-highway time-slot interchanger february 1999 56 lucent technologies inc. electrical characteristics t a = C40 c to +85 c; v dd = 3.3 v 10%; v ss = 0 v timing characteristics t a = C40 c to +85 c; v dd = 3.3 v 10%; v ss = 0 v the following timing characteristics are generated for the ttl input and output levels. table 46. clock specifications parameter symbol test conditions min typ max unit input leakage current: non-pull-up pins pull-up pins non-pull-up i/o pins pull-down pins i il i il i il i il v ss < v in < v dd 10% v in = v ss v ss < v in < v dd 10% v in = v dd 10% 10 60 70 300 m a m a m a m a output voltage: low: dt , d[70] txd[310], txoe[310] tdo, int high: dt , d[70] txd[310], txoe[310] tdo, int v ol v oh i ol = C10 ma i ol = C6 ma i ol = C2 ma i oh = 10 ma i oh = 6 ma i oh = 2 ma 2.4 2.4 2.4 0.4 0.4 0.4 v v v v v v load capacitance: dt , d[70], int txd[310] txoe[310] tdo c l c l c l c l 50 25 20 70 pf pf pf pf pin name frequency duty cycle clock period stability rise time (max) fall time (max) pclk 0 mhz65 mhz 50% 10% ck 2.048 mhz 4.096 mhz 8.192 mhz 16.384 mhz 50% 10% 50% 10% 50% 10% 50% 10% 64 ns 32 ns 16 ns 8 ns 10 ns 10 ns 10 ns 10 ns 10 ns 10 ns 10 ns 10 ns tck 10 mhz 50% 10%
preliminary data sheet TTSI2K32T february 1999 2048-channel, 32-highway time-slot interchanger 57 lucent technologies inc. timing characteristics (continued) 5-7063(f)r.2 figure 16. asynchronous read cycle timing using dt handshake 5-7064(f)r.2 figure 17. asynchronous write cycle timing using dt handshake table 47. asynchronous read and write interface timing using dt handshake *cs asynchronously controls the output enable of d[70] and dt . the delay from cs to the output enable of dt is equivalent to the delay from as or ds to dt . therefore, in order to guarantee that dt is driven high before being 3-stated, a cs hold time is required (t3). if this tim- ing cannot be met, then there are two options. one, disconnect dt and rely on wait-states to terminate the cycle. the read or write cycle will be completed by the device 183 ns after the start of the cycle, which is defined by cs , as , and ds all being active. the second option is to use an external pull-up on dt to pull dt high within the timing requirements of the microprocessor. symbol description min max unit t1 a[140] or r/w setup to as 0ns t2 a[140] or r/w hold from as 0ns t3 cs hold from as or ds 4* ns t4 dt output delay from as or ds (c l = 50 pf) 3* 8* ns t5 dt or d[70] high-impedance from cs (c l = 50 pf) 8.5* ns t6 d[70] input setup to ds (c l = 50 pf) 0 ns t7 d[70] input hold from ds (c l = 50 pf) 0 ns t8 d[70] output setup prior to dt output (c l = 50 pf) 0 ns d[70] as ds dt read data t4 t4 t8 cs a[140] read address t3 r/w t1 t2 t5 high impedance d[70] as ds dt write data t4 t6 cs a[140] write address t3 r/w t1 t2 t7 t4 t5 high impedance
TTSI2K32T preliminary data sheet 2048-channel, 32-highway time-slot interchanger february 1999 58 lucent technologies inc. timing characteristics (continued) 5-7065(f)r.3 figure 18. asynchronous read cycle timing using only cs 5-7066(f)r.3 figure 19. asynchronous write cycle timing using only cs table 48. asynchronous microprocessor interface timing using only cs symbol description min max unit t9 a[140], r/w , d[70] input setup to cs 0ns t10 a[140], r/w , d[70] input hold from cs 0ns t11 pulse width of cs inactive 100 ns t12 pulse width of cs active 200 ns t13 d[70] output delay from cs (c l = 50 pf) 200 ns t14 d[70] output hold from cs (c l = 50 pf) 0 ns read address read data mm a[140] cs as ds r/w d[70] t9 t10 t14 t11 t13 write address write data mm a[140] cs as ds r/w d[70] t9 t10 t11 t12
preliminary data sheet TTSI2K32T february 1999 2048-channel, 32-highway time-slot interchanger 59 lucent technologies inc. timing characteristics (continued) 5-7067(f)r.3 figure 20. synchronous read cycle timing 5-7068(f)r.2 figure 21. synchronous write cycle timing t23 t25 pclk cs as dt d[70] a[140] read address r/w t19 t17 t22 t21 t16 t21 t24 t15 t15 t18 t22 t22 high impedance write data t22 t23 t21 pclk cs as dt d[70] a[140] write address r/w t19 t17 t18 t22 t22 t21 t16 t21 t20 t15 t15 high impedance
TTSI2K32T preliminary data sheet 2048-channel, 32-highway time-slot interchanger february 1999 60 lucent technologies inc. timing characteristics (continued) table 49. synchronous microprocessor interface timing * the cs setup timing requirement relative to pclk can be programmed for either the first or second clock cycle of a microprocessor acc ess using csv (bit 7) of the general command register. ? the input setup timing requirement assumes a pclk frequency of at least 25 mhz. for frequencies slower than 25 mhz, the d[70] propa- gation delay must be less than 40 ns from the rising edge of pclk which samples as . ? when data is driven by the tsi during a synchronous read cycle, good data is driven prior to dt being asserted. symbol description min max unit t15 cs setup to rising pclk edge 10* ns t16 cs hold from rising pclk edge 0 ns t17 as setup to rising pclk edge 6 ns t18 as hold from rising pclk edge 0 ns t19 r/w , a[140] input setup to rising pclk edge 0 ns t20 d[70] input setup to rising pclk edge 0 ? ns t21 r/w , a[140], d[70] input hold from rising pclk edge 0 ns t22 dt output delay from rising pclk edge (c l = 10 pf to 50 pf) 2.6 10 ns t23 dt high impedance from falling pclk edge (c l = 50 pf) 7 ns t24 d[70] output delay from rising pclk edge (c l = 50 pf) 0 ? ns t25 d[70] output high impedance from rising pclk edge (c l = 10 pf to 50 pf) 412ns
preliminary data sheet TTSI2K32T february 1999 2048-channel, 32-highway time-slot interchanger 61 lucent technologies inc. timing characteristics (continued) tdm highway timing is shown below for the following scenario (i = 0, 1, 2 . . . 31; j = 0, 1, 2 . . . 31): n the input ck speed is set to 8.192 mhz. n fsync is programmed to be active-high and sampled by a rising edge of ck. n the rxd[i] highway is set for 0-bit offset and a highway data rate of 4.096 mbits/s. n the txd[j] highway is set for 0-bit offset and a highway data rate of 8.192 mbits/s. 5-7465(f)r.3 figure 22. tdm highway timing table 50. tdm highway timing the tdm highway timing numbers, t26t30, also apply for all other cases as well, i.e., n ck speed is 2.048 mhz, 4.096 mhz, or 16.384 mhz. n fsync is sampled on the falling edge of ck. n fsync is active-low. n rxd[i] is sampled on the falling edge of ck. n rxd[i] data rate is 2.048 mbits/s or 8.192 mbits/s. n txd[j] is driven on the falling edge of ck. n txd[j] data rate is 2.048 mbits/s or 4.096 mbits/s. n txoe[j] is driven on the falling edge of ck. txoe[j] is driven on the same edge as txd[j]. symbol description min max unit t26 fsync, rxd[031] setup to active ck edge 10 ns t27 fsync, rxd[031] hold from active ck edge 5 ns t28 txd[031] delay from active ck edge (c l = 25 pf) 5 15 ns t29 txd[031] high impedance (c l = 25 pf) 15 ns t30 txoe[031] delay from active ck edge (c l = 20 pf) 5 15 ns fsync ck rxd[i] txd[j] fsync sampled active txoe[j] t26 t27 t28 t29 bit 0 t30 (8.192 mhz) (4.096 mbits/s) t27 t26 bit 1 bit 2 bit 5 bit 6 bit 5 t29 t30 bit 0 bit 1 bit 2 bit 3 bit 4 bit 5 bit 6 bit 7 (8.192 mbits/s)
TTSI2K32T preliminary data sheet 2048-channel, 32-highway time-slot interchanger february 1999 62 lucent technologies inc. timing characteristics (continued) 5-7070(f)r.2 figure 23. jtag interface timing table 51. jtag interface timing symbol description min max unit t31 tdi, tms setup to rising tck edge 10 ns t32 tdi, tms hold from rising tck edge 10 ns t33 tdo delay from falling tck edge (c l = 70 pf) 5 35 ns t34 tdo high impedance from falling tck edge (c l = 70 pf) 35 ns tck tms tdi tdo t32 t31 t34 t33 t32 t31 high impedance
preliminary data sheet TTSI2K32T february 1999 2048-channel, 32-highway time-slot interchanger 63 lucent technologies inc. outline diagram 217-pin pbga dimensions are in millimeters. 5-6562(f) 0.36 0.04 1.17 0.05 2.13 0.19 seating plane solder ball 0.60 0.10 0.20 a b c d e f g h j k l m n p r t u 12 34567 891011121314151617 16 spaces @ 1.27 = 20.32 a1 ball corner 16 spaces @ 1.27 = 20.32 0.75 0.15 pwb mold compound 23.00 0.20 23.00 0.20 19.50 +0.70 C0.00 19.50 +0.70 C0.00 a1 ball identifier zone
TTSI2K32T preliminary data sheet 2048-channel, 32-highway time-slot interchanger february 1999 64 lucent technologies inc. ordering information ds99-045t1e1 replaces ds97-475tic to incorporate the following updates 1. page 8, pin d17, added overline to show active-low (trst ). 2. page 8, removed duplicate e1, e2, e3, e4, e14, e15, e16, and e17 pins. 3. page 20, highway data rate selection section, added paragraph on meeting the 8.192 mbits/s bandwidth requirement for a transmit highway pair at the bottom of the page. 4. page 22, updated figure 10, virtual and physical frames on page 22. 5. page 24, reset sequence section, added paragraph on bist requirement. 6. page 25page 28, low-latency and frame-integrity modes section updated. 7. page 29, test-pattern generation section updated. 8. page 29 and page 30, test-pattern checking section updated. 9. page 38, table 15, general command register (0x00), removed last sentence in description of bit 2 and bit 1. 10. page 38, table 15, general command register (0x00), updated bit 0 symbol from gxen to gxe. 11. page 39, table 16, software reset register (0x01), updated bit 0, software reset description. 12. page 41, table 22, interrupt status register (0x07), updated bit 4 and bit 2 to reserved status. 13. page 42, table 23, interrupt mask register (0x08), updated bit 4 and bit 2 to reserved status. 14. page 42, table 23, interrupt mask register (0x08), bit 3 symbol changed from masked to maskerd. 15. page 44, table 25, test-pattern style register (0x0a), updated test-pattern descriptions. 16. page 45, table 27, test-pattern checker upper time-slot register (0x0c), updated description. 17. page 45, table 28, test-pattern checker lower time-slot register (0x0d), updated description. 18. page 45, table 30, test-pattern error injection register (0x0f), changed register name from test-pattern error selection register to test-pattern error injection register and added sentence to end of description. 19. page 47, table 35, transmit highway configuration register (byte 0) (0x1000 + 4i), updated bit 3bit 2 sym- bol from xceoff to xfboff. 20. page 48, table 37, transmit highway configuration register (byte 2) (0x1002 + 4i), updated bit 2 symbol name from xen to xe. 21. page 49, table 38, receive highway configuration register (byte 0) (0x1800 + 4i), updated bit 3bit 2 symbol from rceoff to rfboff. 22. page 51, transmit highway 3-state options section and table 41, transmit highway 3-state options updated. 23. page 52, data store memory section updated. 24. page 53, table 44, connection store memory (byte 0), changed tsa symbol to rtsa and updated description. 25. page 53, table 45, connection store memory (byte 1), changed portnum symbol to rxhwy. 26. page 52page 54, connection store memory section updated. 27. page 55, absolute maximum ratings table, power dissipation, p d , updated from 450 mw to 440 mw. 28. page 56, table 46, clock specifications, updated clock period stability for ck. 29. page 61, timing characteristics section, updated figure 22, tdm highway timing and text. 30. page 61, table 50, tdm highway timing, timing parameter t26, minimum changed from 15 ns to 10 ns. device code package temperature comcode (ordering number) TTSI2K32T3bal 217-pin pbga C40 c to +85 c 108269770
preliminary data sheet TTSI2K32T february 1999 2048-channel, 32-highway time-slot interchanger 65 lucent technologies inc. notes
TTSI2K32T preliminary data sheet 2048-channel, 32-highway time-slot interchanger february 1999 lucent technologies inc. reserves the right to make changes to the product(s) or information contained herein without notice. n o liability is assumed as a result of their use or application. no rights under any patent accompany the sale of any such product(s) or information. copyright ? 1999 lucent technologies inc. all rights reserved februar y 1999 ds99-045t1e1 (replaces ds97-475tic and ay98-029tic) for additional information, contact y our microelectronics group account mana g er or the followin g : internet: http://www.lucent.com/micro e-mail: docmaster@micro.lucent.com n. america: microelectronics group, lucent technolo g ies inc., 555 union boulevard, room 30l-15p-ba, allentown, pa 18103 1-800-372-2447 , fax 610-712-4106 ( in canada: 1-800-553-2448 , fax 610-712-4106 ) asia pacific: microelectronics group, lucent technolo g ies sin g apore pte. ltd., 77 science park drive, #03-18 cintech iii, sin g apore 118256 tel. (65) 778 8833 , fax ( 65 ) 777 7495 china: microelectronics group, lucent technolo g ies ( china ) co., ltd., a-f2, 23/f, zao fon g universe buildin g , 1800 zhon g shan xi road, shan g hai 200233 p. r. china tel. (86) 21 6440 0468 , ext. 316 , fax ( 86 ) 21 6440 0652 japan: microelectronics group, lucent technolo g ies japan ltd., 7-18, hi g ashi-gotanda 2-chome, shina g awa-ku, tok y o 141, japan tel. (81) 3 5421 1600 , fax ( 81 ) 3 5421 1700 europe: data re q uests: microelectronics group dataline: tel. (44) 1189 324 299 , fax ( 44 ) 1189 328 148 technical in q uiries: germany: (49) 89 95086 0 ( munich ) , united kingdom: (44) 1344 865 900 ( ascot ) , france: (33) 1 40 83 68 00 ( paris ) , sweden: (46) 8 594 607 00 ( stockholm ) , finland: (358) 9 4354 2800 ( helsinki ) , italy: (39) 02 6608131 ( milan ) , spain: (34) 1 807 1441 ( madrid )

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