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ensoniq proprietary information ensoniq proprietary information ensoniq audiopci 97 specification rev 1.1 oct 1, 1997 1 ensoniq audiopci ? 97 ES1371 specification 1. introduction audiopci 97 is the new ensoniq ac97 digital controller which provides the next generation of audio performance to the pc market. audiopci 97 is a 5.0 volt pci bus compatible device that enables the ensoniq soundscape pci solution. audiopci 97 along with an ac97 codec offer the next generation of audio performance in a pc while maintaining full legacy compatibility without old isa bus solutions. some of the capabilities of audiopci 97 are: soundscape wavetable synthesizer . full dos game compatibility multiple sample rate support pci bus master for fast dma sounds are stored in main memory. access to ensoniq ? s world famous sound library of over 4000 sounds 3 stereo inputs and 3 mono inputs can be mixed into the output stream. direct i/o space access of the control registers. 100 pin pqfp or tqfp external i 2 s input no isa bus pins required fully compliant with pc97 power management specification
ensoniq proprietary information ensoniq proprietary information ensoniq audiopci 97 specification rev 1.1 oct 1, 1997 2 2. design concept audiopci 97 is a pci bus master and slave device that is best understood by looking at the device as four interactive subsystems: the pci interface, dma control, legacy functions, and the codec. 2.1. pci interface the pci subsystem is a bus master interface that performs the memory accesses to keep the audio cache buffers full and empties the a/d converter (or i2s input) buffer to main memory as required. the fundamental concept of audiopci 97 is that the pci interface controller has a sufficiently large internal (on-chip) memory cache to meet the memory bandwidth requirements. there is a sound cache block of 64 bytes for each of the audio channels. it is the responsibility of the dma control and the software to keep the buffers full. all system control registers are accessed via i/o on the pci bus. audiopci 97 uses 16 long words in the i/o space for control registers. all registers are read as long words. all registers are written in byte word or longword format. 2.2. dma control audiopci 97 essentially implements a 3 channel dma controller. these virtual dma channels are implemented via the ccb, pci and serial interface modules. the serial interface signals the ccb module when a cache transfer is required (playback or record). the ccb module then signals the pci module to initiate a bus master data transfer. at this point the ccb and pci modules will control the data transfer between host system memory and the audiopci 97 internal cache. 2.3. legacy the legacy subsystem is the circuitry required to perform soundblaster, opl-fm and mpu-401 emulation. functionally audiopci 97 traps on access of the soundblaster registers and then issues the appropriate irq or serr command on the pci bus. audiopci 97 handles the legacy dma function in a similar fashion. the exact functionality of the block cannot be fully disclosed at this time due to pending patent protection for the application of this technique. 2.4. codec the codec controller supports any ac97 compliant codec. the functionality of the a/d and d/a sections are similar to those found in other standard codecs. the a/d portion of the codec is handled as an independent asynchronous event with a dma buffer control structure. each time the a/d fifo is filled, a bus master request occurs and the fifo is transferred to main memory.
ensoniq proprietary information ensoniq proprietary information ensoniq audiopci 97 specification rev 1.1 oct 1, 1997 3 3. block diagram pci interface block ad[31:0] c/be[3:0]# par frame# trdy# irdy# stop# devsel# idsel perr# serr# req# gnt# clk rst# inta# clock generation joystick uart chip select & irq & gpio host interface control src cache ram cache control block legacy high speed bus mux cache memory sample rate converter serial control ac97 codec controller joy[7:0] midi out midi in i 2 s [bclk,lrclk,data] ac link: ac97_sync sdata_out bclk sdata_in gpio[3:0] xtalo ext irq xtali host address bus host data bus memory data bus memory address bus
ensoniq proprietary information ensoniq proprietary information ensoniq audiopci 97 specification rev 1.1 oct 1, 1997 4 4. the system components 4.1. pci interface/legacy the pci subsystem is a bus master interface that performs the memory accesses to keep the audio cache buffers full and empties the a/d converter (or i2s input) buffer to main memory as required. all system control registers are accessed via i/o on the pci bus. audiopci 97 uses 16 long words in the i/o space for control registers. all registers are read as long words. all registers are written in byte word or longword format. the pci block also includes the functions necessary to provide legacy mode support. this block generates irq or serr# at a specified adlib access, soundblaster access, dma controller access, irq (pic) controllers access, microsoft wss access, or soundscape access. 4.2. bus master cache control (ccb) this block controls the transfer of data between the pci memory and the internal memory. the serial block signals when a cache fill/transfer is required in the three memory buffers. the ccb calculates the pci address from the frame data and issues a command to the pci interface. when the pci interface signals that the data is available the ccb channels the data to the proper place in memory. this block is functionally equivalent to a 3 channel dma controller. 4.3. serial interface this block performs a parallel transfer to/from the internal memory for the record and playback channels respectfully. the record channel source can be either the i2s inputs or the ac97 codec adc serial input signal. this block also signals the ccb block when a cache fill/transfer is required. 4.4. host interface this block arbitrates a pci access to the internal memory. when the data transfer is complete, it responds with an acknowledge to the pci interface block. this block provides direct access to the internal memory. it can be used to access the playback/record channels cache, the uart fifo or the ccb registers. 4.5. codec controller this block reads/writes configuration data from the host bus to the ac97 codec using the serial protocol of the ac97 codec. this block also merges the mixed playback channel data into the ac97 codec ? s serial data input, and it retrieves the record channel data from the ac97 codec ? s serial data output. 4.6. irq & chip select block the functions for this block are: 1. decode the internal address bus to generate chip selects to each block. 2. contains internal registers whose outputs are control bits used by internal blocks for control/selection. 3. summarizes all system irq ? s (uart, codec, etc.) to generate a single audiopci 97 irq to the host. this also includes the playback and record dma channels. any irq masking is performed within the individual blocks except for the ccb block interrupt. 4.7. joystick this block contains the logic required to implement the joystick interface for audiopci 97.
ensoniq proprietary information ensoniq proprietary information ensoniq audiopci 97 specification rev 1.1 oct 1, 1997 5 4.8. uart this block includes both the transmitter and receiver for the audiopci 97 midi interface. the uart controller also implements an eight byte fifo in the internal memory. this fifo is then accessed through the host interface block. 4.9. sample rate converter this block receives or sends samples from/to the serial interface block for the playback/record channels. the sample rate converter block converts two variable input rate playback channels to one fixed rate (48khz) output channel. it also takes one fixed input rate (48khz) record channel and converts it to a variable rate output channel. the channels are programmed by writing several ram locations that are a function of the input and output rates. the sample rate converter block has it ? s own memory section. the sample rate converter memory is accessible only by the sample rate converter block. n fir filter codec 48k r ecord data 4k-48k synth & wave channels 4k-48k stereo codec 48k linear interp olate sample rate converter flow the first stage consists of expanding the number of input samples by an integer number (n), up to a maximum of 16, and filling in between the samples with zeros. then the new samples are filtered by a long 1/32 band fir filter. in practice, the zeros are not multiplied with their corresponding fir coefficients. the input samples are fed into an input fifo and the hardware figures out which fir coefficient corresponds to each fifo sample. the starting coefficient and the spacing between successive coefficients are calculated by aligning the fir filter with a virtual fifo which is the expanded version of the real fifo. the coefficient positions also depend on the third stage in the block diagram, the linear interpolator. this interpolator uses frequency and accumulator registers to interpolate between 2 samples. 4.10. memory bus this pathway is used exclusively to transfer data between the internal sound cache memory and the various sub-systems. the access priority for this bus is (highest to lowest): cache control block host interface uart interface serial interface
ensoniq proprietary information ensoniq proprietary information ensoniq audiopci 97 specification rev 1.1 oct 1, 1997 6 4.11. internal memory there are two separate sections of memory in audiopci 97. one section is allocated as a cache for the playback and record channels and also as a fifo for the uart. the other section is allocated to the sample rate converter module and is used as a cache for sample rate conversion and also as control register space for the playback and record channels in the sample rate converter. the internal memory for the sound cache in audiopci 97 is organized as 4 blocks of 64 bytes each. each block is divided into 4 pages of 16 bytes each (4 longwords). memory can be accessed as longwords only. in order to access a specific page of memory the memory page register must first be setup for the specific page to be accessed. the first three blocks of memory contain the 3 circular buffers for the 2 playback channels and the record channel. the last block contains the frame information for the playback and record channels and also includes the uart fifo. the memory block and page organization is shown below : block page higher address lower 0 - dac 1 0000 dac1 sample bytes 15 - 0 lower half buffer 0001 dac1 sample bytes 31 - 16 0010 dac1 sample bytes 47 - 32 upper half buffer 0011 dac1 sample bytes 63 - 48 1 - dac2 0100 dac2 sample bytes 15 - 0 lower half buffer 0101 dac2 sample bytes 31 - 16 0110 dac2 sample bytes 47 - 32 upper half buffer 0111 dac2 sample bytes 63 - 48 2 - adc 1000 adc sample bytes 15 - 0 lower half buffer 1001 adc sample bytes 31 - 16 1010 adc sample bytes 47 - 32 upper half buffer 1011 adc sample bytes 63 - 48 3 - frame/uart 1100 dac1, dac2 frame information (see register descriptions) 1101 adc frame information (plus 2 open longwords) 1110 uart fifo (only bits 8 - 0 of each longword are used) 1111 uart fifo
ensoniq proprietary information ensoniq proprietary information ensoniq audiopci 97 specification rev 1.1 oct 1, 1997 7 the internal memory organization for the sample rate converter in audiopci 97 is shown below. the memory is accessed through the sample rate converter interface register located at address 10h. loc(hex) fifo ram 128x16 play/rec registers 0 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 play 1 left s 0 m trunc_start n hstart f 10 play 1 right 1 vf.i 0 ac.i 20 2 0 ac.f play 2 left 3 0 vf.f 30 play 2 right volume registers 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 40 rec left 6c 0 rec.n 0 rec left (copy) rec right 6d 0 rec.n 0 (copy) 56 6e unused 6f unused rec right s play 1 l 7c g p1.vol.i p1.vol.f n 6c volume reg rec s 70 play 1 regs play 1 r 7d g p1.vol.i p1.vol.f 74 play 2 regs n 78 rec regs s 7c volume reg play play 2 l 7e g p2.vol.i p2.vol.f n s play 2 r 7f g p2.vol.i p2.vol.f n sample rate converter interface 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 b d d d d ram addr w u i p p r unused ram data e s s 1 2 e y c
ensoniq proprietary information ensoniq proprietary information ensoniq audiopci 97 specification rev 1.1 oct 1, 1997 8 5. pci data transfers the internal control registers of the audiopci 97 chip and the ac97 codec are accessed via 16 long words in pci direct i/o space. these registers are always read as 32 bit longwords but can be written as bytes, words or longwords. pci bus mastering is used to transfer audio data between system memory and audiopci 97 internal memory. the internal cache control block and the pci interface control these transfers. only burst read/write transfers are allowed. all data transfers are 8 long word burst transfers. 5.1. audio read transfers the ccb requests a read data transfer from the pci interface block (pcib). the pcib arbitrates for the pci bus and initiates an 8 long word read starting at the system address specified by the ccb in the read request. when the data is acquired, the pcib signals the ccb to begin moving the data to internal memory. the ccb performs any byte alignment required and writes the data to the appropriate buffer in the internal memory. the ccb will complete the current transfer request and then proceed to the next highest priority request. 5.2. audio write transfers the ccb will first write up to 8 long words into the intermediate pci buffer. the ccb will then request a write transfer from the pcib to main memory and specify the starting address of the transfer. the pcib arbitrates for the pci bus and transfers 8 long words into system memory. eight long words will always be transferred during this operation.
ensoniq proprietary information ensoniq proprietary information ensoniq audiopci 97 specification rev 1.1 oct 1, 1997 9 6. pci configuration space the following information is the pci configuration space for the audiopci 97 chip. all bits not specifically mentioned below are zero and read only. vendor id address 00h addressable as word power on reset value 1274h configuration space bit(s) r/w name data value 15:0 r vendor id 1274h device id address 02h addressable as word power on reset value 1371h configuration space bit(s) r/w name data value 15:0 r device id 1371h command address 04h addressable as word power on reset value 0000h configuration space bit(s) r/w name data value 15:10 r reserved these bits are reserved and always read back as zeros. 9 r zero this command bit is not implemented and always reads back as zero. 8 r/w serr#_en enable bit for serr# driver. 0 - serr# driver disabled. 1 - serr# driver enabled. 7:3 r zero these command bits are not implemented and always read back as zeros. 2 r/w pci_master pci bus master enable bit. this bit controls a device ? s ability to act as a pci bus master. the ES1371 can act as a bus master. 0 - pci bus mastering disabled. 1 - pci bus mastering enabled. 1 r zero this command bit is not implemented and always reads back as zero. 0 r/w io_access i/o space access bit. this bit controls whether the device can be accessed in i/o space. the ES1371 is accessed in this space. 0 - i/o space access disabled. 1 - i/o space access enabled.
ensoniq proprietary information ensoniq proprietary information ensoniq audiopci 97 specification rev 1.1 oct 1, 1997 10 status address 06h addressable as word power on reset value x610h configuration space bit(s) r/w name data value 15 r parity parity error status bit. 0 - no parity error. 1 - parity error detected. 14 r serr# serr# pci bus signal active status bit. this bit will be set if the audiopci 97 asic is asserting the pci serr# signal. 0 - serr# signal inactive. 1 - serr# signal active. 13 r master-abort master abort status bit. this bit will be set whenever a audiopci 97 asic bus mastering transaction has been terminated by a master-abort. 12 r target-abort target abort status bit. this bit will be set whenever a audiopci 97 asic bus mastering transaction has been terminated by a target- abort. 11 r zero this status bit is not implemented and always reads back as zero. 10:9 r devsel# devsel# timing. these status bits encode the timing of the pci devsel# signal. audiopci 97 implements the slow timing mode. 00 - fast 01 - medium 10 - slow 11 - reserved 8:5 r zero these status bits are not implemented and always read back as zeros. 4 r capabilities indicates support for acpi. the audiopci 97 asic does support acpi so this bit is set to a one. 3:0 r zero these status bits are reserved and always read back as zeros. class code & revision id address 08h addressable as long word power on reset value 04010000h configuration space bit(s) r/w name data value 31:8 r class code 040100h (multimedia audio device) 7:0 r revision id 02h
ensoniq proprietary information ensoniq proprietary information ensoniq audiopci 97 specification rev 1.1 oct 1, 1997 11 cache line size address 0ch addressable as byte power on reset value 00h configuration space bit(s) r/w name data value 7:0 r cache line size 00h latency timer address 0dh addressable as byte power on reset value xxh configuration space bit(s) r/w name data value 7:3 r/w latency latency timer specified in pci bus clocks. 2:0 r zero 0h header type address 0eh addressable as byte power on reset value 00h configuration space bit(s) r/w name data value 7:0 r header type 00h bist address 0fh addressable as byte power on reset value 00h configuration space bit(s) r/w name data value 7:0 r bist 00h base address address 10h addressable as long word power on reset value xxxxxxxxh configuration space bit(s) r/w name data value 31:6 r/w base address variable 5:1 r zero 00h (address 64 byte aligned) 0 r one 1h base address address 14, 18, 1c, 20, 24h addressable as long word power on reset value 00000000h configuration space bit(s) r/w name data value 31:0 r not implemented 00000000h cardbus cis pointer address 28h addressable as long word power on reset value 00000000h configuration space bit(s) r/w name data value 31:0 r not implemented 00000000h
ensoniq proprietary information ensoniq proprietary information ensoniq audiopci 97 specification rev 1.1 oct 1, 1997 12 subsystem vendor id address 2ch addressable as word power on reset value 1274h configuration space bit(s) r/w name data value 15:0 r subsystem vendor id 1274h subsystem id address 2eh addressable as word power on reset value 1371h configuration space bit(s) r/w name data value 15:0 r subsystem id 1371h expansion rom address address 30h addressable as long word power on reset value 00000000h configuration space bit(s) r/w name data value 31:0 r exp rom addr 00000000h capabilities pointer address 34h addressable as long word power on reset value dch configuration space bit(s) r/w name data value 7:0 r cap_ptr dch - pointer to first entry of capabilities list in configuration space interrupt line address 3ch addressable as byte power on reset value xxh configuration space bit(s) r/w name data value 7:0 r/w interrupt variable interrupt pin address 3dh addressable as byte power on reset value 01h configuration space bit(s) r/w name data value 7:0 r interrupt pin 01h min_gnt address 3eh addressable as byte power on reset value 0ch configuration space bit(s) r/w name data value 7:0 r min_gnt 0ch
ensoniq proprietary information ensoniq proprietary information ensoniq audiopci 97 specification rev 1.1 oct 1, 1997 13 max_lat address 3fh addressable as byte power on reset value 80h configuration space bit(s) r/w name data value 7:0 r max_lat 80h capabilities identifier address dch addressable as byte power on reset value 01h configuration space bit(s) r/w name data value 7:0 r cap_id 01h - indicates power management capability next item pointer address ddh addressable as byte power on reset value 00h configuration space bit(s) r/w name data value 7:0 r next_item_ptr 00h - indicates last entry in capabilities list power management capabilities - pmc address deh addressable as word - read only power on reset value 6c31h configuration space bit(s) r/w name data value 15:11 r pme_support 0dh - determines level from which pme# can be asserted 10 r d2_support 1h - d2 is supported 9 r d1_support 0h - d1 is not supported 8:6 r reserved 0h 5 r dsi 1h - device specific initialization required 4 r auxpwr 1h - auxiliary power required for pme generation 3 r pmeclk 0h - pci clock is not required for pme# generation 2:0 r version 1h - indicates conformance to the pci power management 1.0 specification
ensoniq proprietary information ensoniq proprietary information ensoniq audiopci 97 specification rev 1.1 oct 1, 1997 14 power management control/status - pmcsr address e0h addressable as byte, word or long word power on reset value 00000001h configuration space bit(s) r/w name data value 15 r/w clear pme_status set if pme# condition exists regardless of state of pme_en bit. a write of a 1 to this bit clears the pme condition. 14:13 r not implemented 0h -data field not implemented, therefore data scale read only 12:9 r not implemented 0h -data field not implemented, therefore data select read only 8 r/w pme_en enables the assertion of the pme# pin 7:2 r reserved 00h 1:0 r/w powerstate 00 - d0 01 - d1 10 - d2 11 - d3 whenever this register is written such that the value of the power state bits change, an interrupt will be generated. this will appear on the inta# pin if the pwrinten bit is set in the interrupt control register. the interrupt is cleared by writing the curpdlev bits in the interrupt control register to equal the value of the power state bits. 7. register map all control registers in audiopci 97 are addressed in the direct pci i/o space. there are control registers for each of the major blocks of the audiopci system. the memory map is shown below: audiopci 97 memory map base upper module address address 00h 07h interrupt/chip select 08h 0bh uart 0ch 0fh host interface - memory page 10h 13h sample rate converter 14h 17h codec 18h 1fh legacy 20h 2fh serial interface 30h 3fh host interface - memory
ensoniq proprietary information ensoniq proprietary information ensoniq audiopci 97 specification rev 1.1 oct 1, 1997 15 7.1. irq & chip select block the irq/chip select block contains two 32 bit registers. the first register is the control register which can be read and written. the second register is the status register which is a read only register. the control registers includes bits for module enables, interrupt control, general purpose i/o pins and power management functions. interrupt/chip select control register address 00h addressable as byte, word, longword power on reset value fcxf0000h direct mapped bit(s) r/w name function 31:26 r ones these bits are not implemented and read back as ones. 25:24 r/w joy_asel[1:0] these two bits are dedicated to dave sowa and will map the joystick port to 4 different base addresses as follows: 00 - joystick base address $200 01 - joystick base address $208 10 - joystick base address $210 11 - joystick base address $218 23:20 r gpio_in[3:0] these bits will read the current value on the gpio [3:0] pins. 19:16 r/w gpio_out[3:0] these bits when set low will set the corresponding gpio output low. if these bits are set high then the gpio pads will be high or they can be used as inputs. 15 r/w msfmtsel this bit selects the mpeg serial data format. 0 - sony (lrclk high = left channel ; data left justified) 1 - i2s (lrclk low = left channel ; data 1 bit clock delayed) 14 r/w sync_res this bit is used to generate a warm ac97 reset as described in section 5.2.1.2. of the audio codec 97 specification. 13 r/w adc_stop this bit when set high will prevent the ccb module from doing a record channel pci transfer. 0 - ccb will transfer record information. 1 - ccb will not transfer record information. 12 r/w pwr_intrm this bit selects is the interrupt mask bit for detecting changes in the power management level. 0 - power level change interrupts are disabled. 1 - power level change interrupts are enabled. 11 r/w m_cb this bit selects either i2s or the codec adc as the source for the record channel in the serial module. 0 - codec adc is record channel source. 1 - i2s is record channel source. 10 r/w ccb_intrm this bit is the interrupt mask bit for the ccb module voice interrupts. 0 - ccb voice interrupts are disabled. 1 - ccb voice interrupts are enabled. 9:8 r/w pdlev[1:0] current power down level. these bits reflect the power down level the part is currently programmed to. when the power state bits programmed in configuration space differs from these bits, an interrupt is generated. the isr should program this to equal the value in configuration space in order to clear the interrupt. 00 - d0 01 - d1 10 - d2 11 - d3
ensoniq proprietary information ensoniq proprietary information ensoniq audiopci 97 specification rev 1.1 oct 1, 1997 16 7 r/w breq this bit controls access to the internal memory. it is for test purposes only. if this bit is ever set high it will prevent the ccb, serial, uart and hostif modules from accessing the memory. 0 - memory bus request disabled (power on state) 1 - memory bus request enabled ( disables memory access ) 6 r/w dac1_en this bit enables the dac1 playback channel (codec fm dac). to restart a channel that had stopped, this bit must be reset low and then set high. 0 - dac1 playback channel disabled 1 - dac1 playback channel enabled 5 r/w dac2_en this bit enables the dac2 playback channel (codec dac). to restart a channel that had stopped, this bit must be reset low and then set high. 0 - dac2 playback channel disabled 1 - dac2 playback channel enabled 4 r/w adc_en this bit enables the adc playback channel (codec adc). to restart a channel that had stopped, this bit must be reset low and then set high. 0 - adc record channel disabled 1 - adc record channel enabled 3 r/w uart_en this bit enables uart module operation. 0 - uart disabled 1 - uart enabled 2 r/w jystk_en this bit enables joystick module operation. 0 - joystick disabled 1 - joystick enabled 1 r/w xtalckdis xtal clock disable. this bit when set high will shut down the crystal clock input to all internal modules. 0 - xtal clock enabled. 1 - xtal clock disabled. 0 r/w pciclkdis pci clock disable. this bit when set high will shut down the pci clock input to all internal modules except the pci module and the interrupt/chip select module. 0 - pci clock enabled 1 - pci clock disabled
ensoniq proprietary information ensoniq proprietary information ensoniq audiopci 97 specification rev 1.1 oct 1, 1997 17 interrupt/chip select status register address 04h addressable as longword only power on reset value 7ffffec0h direct mapped bit(s) r/w name function 31 r intr this bit is the summary interrupt bit. 0 - no interrupt pending 1 - interrupt from dac1, dac2, adc, uart, ccb or power management has occurred. 30:9 r ones these bits always read back as ones. 8 r sync_err this bit indicates a synchronization error has occurred in the codec interface module. 0 - codec synchronization error has not occurred. 1 - codec synchronization error has occurred. 7:6 r vc[1:0] these bits are the voice code from the ccb module. these bits are only valid if the ccb interrupt bit (mccb) is high. 00 - dac1 01 - dac2 10 - adc 11 - undefined 5 r mpwr this bit indicates whether a power level interrupt has occurred. 0 - no power level interrupt. 1 - power level interrupt pending. 4 r mccb this bit is the masked ccb interrupt bit. a ccb interrupt will occur if a pci bus abort condition occurs during a voice buffer transfer. the ccb interrupt is masked with the ccb interrupt mask bit (ccb_intrm) in the control register. 0 - no ccb interrupt 1 - ccb interrupt pending 3 r uart this bit is the uart interrupt bit. 0 - no uart interrupt 1 - uart interrupt pending 2 r dac1 this is the dac1 playback channel interrupt bit. 0 - no dac1 channel interrupt 1 - dac1 channel interrupt pending 1 r dac2 this is the dac2 playback channel interrupt bit. 0 - no dac2 channel interrupt 1 - dac2 channel interrupt pending 0 r adc this is the adc record channel interrupt bit. 0 - no adc channel interrupt 1 - adc channel interrupt pending
ensoniq proprietary information ensoniq proprietary information ensoniq audiopci 97 specification rev 1.1 oct 1, 1997 18 7.2. uart the uart contains three 8 bit registers. the data register can be read or written and is used to receive or transmit midi information. the second register is a 8 bit control register which is write only. the third register is a 8 bit status register which is read only. uart data register address 08h addressable as byte only power on reset value ??h direct mapped bit(s) r/w name function 7:0 r/w data[7:0] the uart data register provides access to midi serial data input/output. uart status register address 09h addressable as byte only power on reset value 00h direct mapped bit(s) r/w name function 15 r rxint this bit is the uart receiver interrupt bit. 0 - no uart receiver interrupt 1 - uart receiver interrupt pending 14:11 r zero these bits always read back as zeros to allow for soundscape detection. 10 r txint this bit is the uart transmitter interrupt bit 0 - no uart transmitter interrupt 1 - uart transmitter interrupt pending 9 r txrdy this bit is the uart transmitter ready bit. 0 - uart transmitter not ready 1 - uart transmitter ready 8 r rxrdy this bit is the uart receiver ready bit. 0 - uart receiver not ready 1 - uart receiver ready
ensoniq proprietary information ensoniq proprietary information ensoniq audiopci 97 specification rev 1.1 oct 1, 1997 19 uart control register address 09h addressable as byte only power on reset value 00h direct mapped bit(s) r/w name function 15 w rxinten this bit is the uart receiver interrupt enable bit. 0 - uart receiver interrupts disabled 1 - uart receiver interrupts enabled 14:13 w txinten[1:0] these two bits are the control bits for the uart transmitter operation. 00 - 01 - txrdy interrupts enabled 10 - 11 - 12:10 undefined these bits are undefined 9:8 w cntrl[1:0] these two bits are the control bits for the uart. 00 - 01 - 10 - 11 - software reset uart reserved register address 0ah addressable as byte only power on reset value 00h direct mapped bit(s) r/w name function 7:1 undefined these bits are undefined. 0 r/w test_mode this bit enables the uart test mode. when the test mode bit is set the uart clock is switched to the pci bus clock. the faster clock reduces the size of the test vectors and also shortens the run time of the test vectors. the power up state is normal mode enabled. 0 - normal mode enabled. 1 - uart test mode enabled. 7.3. host interface - memory page the memory page register is a four bit register used to access one of 16 memory pages within the audiopci chip. this register can be read or written but any unused bits are undefined on read back. memory page register address 0ch addressable as byte, word, longword power on reset value ???????0h direct mapped bit(s) r/w name function 31:4 undefined these bits are undefined. 3:0 r/w memory page these bits select what memory page will be accessed. each memory page is 16 bytes and is addressed from 30h - 3fh.
ensoniq proprietary information ensoniq proprietary information ensoniq audiopci 97 specification rev 1.1 oct 1, 1997 20 7.4. sample rate converter this block receives or sends samples from/to the serial interface block for the playback/record channels. it also provides the necessary sample rate conversion for the ac97 codec. the sample rate converter block contains one 32 bit register. this register is used to read/write the sample rate converter fifo/control ram. sample rate converter interface register address 10h addressable as longword power on reset value 00000000h direct mapped bit(s) r/w name function 31:25 r/w src_ram_adr these bits are the address of the sample rate converter ram location to be accessed. 24 r/w src_ram_we this bit is the read/write control bit for accessing the sample rate converter ram. 23 r src_ram_busy this bit when high indicates the sample rate converter is accessing the ram. this bit will be set within 3 pci clocks after accessing this register. this bit will be reset when the requested read/write ram operation has been completed. 22 r/w src_disable this is the enable bit for the sample rate converter. 0 - sample rate converter enabled. 1 - sample rate converter disabled. 21 r/w dis_p1 this bit when high will disable playback channel 1 from updating the accumulator. 0 - playback channel 1 accumulator update enabled. 1 - playback channel 1 accumulator update disabled. 20 r/w dis_p2 this bit when high will disable playback channel 2 from updating the accumulator. 0 - playback channel 2 accumulator update enabled. 1 - playback channel 2 accumulator update disabled. 19 r/w dis_rec this bit when high will disable record channel from updating the accumulator. 0 - record channel accumulator update enabled. 1 - record channel accumulator update disabled. 18:16 r/w undefined these bits are undefined. 15:0 r/w src_ram_data these bits are the value of the ram to be read/written from /to the ram at the location pointed to by the src_ram_adr address pointer above.
ensoniq proprietary information ensoniq proprietary information ensoniq audiopci 97 specification rev 1.1 oct 1, 1997 21 7.5. codec interface the codec interface register is a 32 bit register that provides access to the ac97 codec control registers. this register is a pseudo read/write and must be accessed as a longword. a write to this register will initiate a codec register read/write operation. a read from this register is used to read a codec register that was initiated by a previous write to the codec interface register. codec write register address 14h addressable as longword power on reset value 00000000h direct mapped bit(s) r/w name function 31:24 w zero these bits are always zeros. 23 w pird ac97 codec register read/write control bit 0 - write ac97 codec register. 1 - read ac97 codec register. 22:16 w piadd these bits are the address of the ac97 codec register to be read/written. 15:0 w pidat these bits are the data value to be written into the ac97 codec register. set to zero for a ac97 codec register read. codec read register address 14h addressable as longword power on reset value 00000000h direct mapped bit(s) r/w name function 31 r rdy this bit when high indicates that this register contains valid read data from the ac97 codec register file. 30 r wip this bit when high indicates that a register read/write to the ac97 codec is in progress. 0 - ac97 codec register interface inactive. 1 - ac97 codec register access in progress. 29:24 r zero these bits always read back as zeros. 23 r pord ac97 codec register read/write control bit 0 - write ac97 codec register. 1 - read ac97 codec register. 22:16 r poadd these bits are the address of the ac97 codec register for the read register operation. 15:0 r podat these bits are the data value read from the ac97 codec register at the above address.
ensoniq proprietary information ensoniq proprietary information ensoniq audiopci 97 specification rev 1.1 oct 1, 1997 22 7.6. legacy the legacy register is a 32 bit register that performs both control and status functions. basically the lower word functions as the status register and the upper word functions as the control register. the only exception to this is bit zero which is a control bit for a write and a status bit for a read. legacy control/status register address 18h addressable as byte, word, longword power on reset value 00?????00000000011111?????????0?b direct mapped bit(s) r/w name function 31 r/w jfast this bit selects fast (vs isa) joystick timing. 0 - isa joystick timing 1 - fast joystick timing 30 r/w hib this bit is the host interrupt blocking enable bit (dma config bit must be set) to prevent applications from blocking nmi. 0 - host interrupt blocking disabled 1 - host interrupt blocking enabled 29 r/w vsb this bit selects the capture address range for soundblaster access. 0 - address range : 220xh - 22fxh 1 - address range : 240xh - 24fxh 28:27 r/w vmpu[1:0] these bits select the capture address range for the base register. 00 - address range : 320xh - 327xh 01 - address range : 330xh - 337xh 10 - address range : 340xh - 347xh 11 - address range : 350xh - 357xh 26:25 r/w vcdc[1:0] these bits select the capture address range for the codec. 00 - address range : 530xh - 537xh 01 - undefined 10 - address range : e80xh - e87xh 11 - address range : f40xh - f47xh 24 r/w firq this bit is used to force an interrupt. 0 - do not force an interrupt 1 - force an interrupt 23 r/w sdmacap this bit enables event capture for the slave dma controller. the decoded address range for this event is c0xh - dfxh. 0 - disables event capture 1 - enables event capture 22 r/w spicap this bit enables event capture for the slave interrupt controller. the decoded address range for this event is a0xh - a1xh. 0 - disables event capture 1 - enables event capture 21 r/w mdmacap this bit enables event capture for the master dma controller. the decoded address range for this event is 0xh - fxh. 0 - disables event capture 1 - enables event capture 20 r/w mpicap this bit enables event capture for the master interrupt controller. the decoded address range for this event is 20xh - 21xh. 0 - disables event capture 1 - enables event capture 19 r/w adcap this bit enables event capture for the adlib registers . the decoded address range for this event is 388xh - 38bxh. 0 - disables event capture
ensoniq proprietary information ensoniq proprietary information ensoniq audiopci 97 specification rev 1.1 oct 1, 1997 23 1 - enables event capture 18 r/w sbcap this bit enables event capture for the soundblaster registers. the decoded address range for this event is selected by the vsb control bit. 0 - disables event capture 1 - enables event capture 17 r/w cdccap this bit enables event capture for the codec. the decoded address range for this event is selected by the vcdc[1:0] control bits. 0 - disables event capture 1 - enables event capture 16 r/w bacap this bit enables event capture for the soundscape base address register. the decoded address range for this event is selected by the vmpu[1:0] control bits. 0 - disables event capture 1 - enables event capture 15:11 r one these bits will always read back as ones 10:8 r e2, e1, e0 these three bits are the event number of the captured event. the event number corresponds to the enable bit which allowed the interrupt. their decoding is shown below: 000 - soundscape base address 001 - codec 010 - soundblaster registers 011 - adlib registers 100 - master interrupt controller 101 - master dma controller 110 - slave interrupt controller 111 - slave dma controller 7:3 r a[4:0] these bits are the least significant i/o address bits during the event captured. 2 r w/r this bit indicates whether the event captured was a read or write operation. 0 - event captured was a read 1 - event captured was a write 1 r zero this bit always reads back as a zero. 0 r/w int# this bit is the interrupt flag for legacy events. a write to this bit (0 or 1) resets the interrupt flag. 0 - interrupt did occur 1 - interrupt did not occur
ensoniq proprietary information ensoniq proprietary information ensoniq audiopci 97 specification rev 1.1 oct 1, 1997 24 7.7. serial interface there is one 16 bit control register and three 32 bit control/status registers in the serial block. the 16 bit control register can be read or written. the three 32 bit control/status registers can be read or written but only the lower 16 bits can actually be written. the upper 16 bits of these registers provides the status of the internal sample counter. serial interface control register address 20h addressable as byte, word, longword power on reset value ff800000h direct mapped bit(s) r/w name function 31:23 r/w ones these bits always read back as ones. they are not writable. 22 r/w dac_test this bit is used for testing purposes. it will select the i2s lrclk input signal as the source for the playback and record channels. it is used for test vector generation purposes only. 0 - dac test mode disabled. 1 - dac test mode enabled. 21:19 r/w p2_end_inc[2:0] these bits are the binary offset value that will be added to the sample address counter at the end of the loop. this value is used only if the dac2 channel is in loop mode; it is not used in stop mode. if loop mode is selected this value must be greater than zero otherwise the channel will not function correctly. this minimum value will be one if 8 bit mode is selected and two if 16 bit mode is selected. 18:16 r/w p2_st_inc[2:0] these bits are the binary offset value that will be added to the sample address counter when the channel is started/restarted. this value can be zero and will allow the sample fetch to start on any byte boundary. for 16 bit data this value must be an even number. 15 r/w r1_loop_sel this bit selects loop/stop mode for the adc channel. this bit determines what action the channel will perform when the sample count reaches zero. 0 - loop mode ; interrupt set (if enabled) but keeps recording 1 - stop mode ; interrupt set (if enabled) , stops recording 14 r/w p2_loop_sel this bit selects loop/stop mode for the dac2 channel. this bit determines what action the channel will perform when the sample count reaches zero. 0 - loop mode ; interrupt set (if enabled) but keeps playing 1 - stop mode ; interrupt set (if enabled) , plays last sample 13 r/w p1_loop_sel this bit selects loop/stop mode for the dac1 channel. this bit determines what action the channel will perform when the sample count reaches zero. 0 - loop mode ; interrupt set (if enabled) but keeps playing 1 - stop mode ; interrupt set (if enabled) , plays last sample 12 r/w p2_pause this bit selects pause mode for the dac2 playback channel. when in pause mode the channel will playback the last sample. 0 - play mode ; normal playback mode or removes channel from pause mode on next sample after bit is cleared 1 - pause mode ; plays last sample continuously on next sample after the pause bit has been set 11 r/w p1_pause this bit selects pause mode for the dac1 playback channel. when
ensoniq proprietary information ensoniq proprietary information ensoniq audiopci 97 specification rev 1.1 oct 1, 1997 25 in pause mode the channel will playback the last sample. 0 - play mode ; normal playback mode or removes channel from pause mode on next sample after bit is cleared 1 - pause mode ; plays last sample continuously on next sample after the pause bit has been set 10 r/w r1_int_en this bit is the interrupt enable bit for the adc channel. to clear the interrupt this bit must be set to zero and then set to one to enable the next interrupt. 0 - adc interrupt disabled 1 - adc interrupt enabled 9 r/w p2_intr_en this bit is the interrupt enable bit for the dac2 channel. to clear the interrupt this bit must be set to zero and then set to one to enable the next interrupt. 0 - dac2 interrupt disabled 1 - dac2 interrupt enabled 8 r/w p1_intr_en this bit is the interrupt enable bit for the dac1 channel. to clear the interrupt this bit must be set to zero and then set to one to enable the next interrupt. 0 - dac1 interrupt disabled 1 - dac1 interrupt enabled 7 r/w p1_sct_rld this bit when set high will force the sample counter for dac1 to be reloaded with the sample count register value on the next rising edge of the dac1 left/right clock. this bit can be returned low on the following instruction. it does not have to be held high for more than 1 microsecond. this control bit is rising edge triggered. 6 r/w p2_dac_sen this bit when set high will enable the dac2 to continue playback when it is in the stopped condition and the dac2 channel has been disabled. without this bit set if the dac2 channel is disabled it will begin to playback zeros. 0 - dac2 plays back zeros when disabled 1 - dac2 plays back last sample when disabled and in stop mode 5:4 r/w r1_s_eb : r1_s_mb these two bits select the data format for the adc channel. for eight bit data modes the msb is always inverted before it is written out to the buffer. for mono modes only the left channel data is recorded. 00 - eight bit - mono mode 01 - eight bit - stereo mode 10 - sixteen bit - mono mode 11 - sixteen bit - stereo mode 3:2 r/w p2_s_eb : p2_s_mb these two bits select the data format for the dac2 channel. for eight bit data modes the msb is always inverted after it is read from the buffer. for mono modes the left channel data is duplicated for both the left and right channels. 00 - eight bit - mono mode 01 - eight bit - stereo mode 10 - sixteen bit - mono mode 11 - sixteen bit - stereo mode 1:0 r/w p1_s_eb : p1_s_mb these two bits select the data format for the dac1 channel. for eight bit data modes the msb is always inverted after it is read from the buffer. for mono modes the left channel data is duplicated for both the left and right channels. 00 - eight bit - mono mode 01 - eight bit - stereo mode 10 - sixteen bit - mono mode
ensoniq proprietary information ensoniq proprietary information ensoniq audiopci 97 specification rev 1.1 oct 1, 1997 26 11 - sixteen bit - stereo mode dac1 channel sample count register address 24h addressable as word, longword power on reset value 00000000h direct mapped bit(s) r/w name function 31:16 r curr_samp_ct these bits are the current value of the internal sample counter for the dac1 playback channel. the number of samples that have been played is samp_ct - curr_samp_ct. 15:0 r/w samp_ct these bits are the number of samples minus one that the dac1 channel will playback. dac2 channel sample count register address 28h addressable as word, longword power on reset value 00000000h direct mapped bit(s) r/w name function 31:16 r curr_samp_ct these bits are the current value of the internal sample counter for the dac2 playback channel. the number of samples that have been played is samp_ct - curr_samp_ct. 15:0 r/w samp_ct these bits are the number of samples minus one that the dac2 channel will playback. adc channel sample count register address 2ch addressable as word, longword power on reset value 00000000h direct mapped bit(s) r/w name function 31:16 r curr_samp_ct these bits are the current value of the internal sample counter for the adc record channel. the number of samples that have been played is samp_ct - curr_samp_ct. 15:0 r/w samp_ct these bits are the number of samples minus one that the adc channel will record.
ensoniq proprietary information ensoniq proprietary information ensoniq audiopci 97 specification rev 1.1 oct 1, 1997 27 7.8. host interface - memory the top 64 bytes of memory are actually used as register storage for the ccb block and also as the fifo for the uart block. the ccb registers are located in the lower 32 bytes of this block and require six longwords. these registers control filling the circular buffers for the two playback channels and the record channel. each channel requires 2 longwords. the uart fifo is located in the upper 32 bytes of this block and requires all eight longwords but uses only 9 bits of each longword. dac1 frame register 1 address 30h addressable as longword memory page 1100b power on reset value xxxxxxxxh direct mapped bit(s) r/w name function 31:0 r/w pci address this longword is the physical pci address of dac1 sample buffer in system memory dac1 frame register 2 address 34h addressable as longword memory page 1100b power on reset value xxxxxxxxh direct mapped bit(s) r/w name function 31:16 r/w current count this 16 bit counter indicates the number of longwords that have been transferred. 15:0 r/w buffer size this 16 bit value indicates the number of longwords in a buffer minus one. dac2 frame register 1 address 38h addressable as longword memory page 1100b power on reset value xxxxxxxxh direct mapped bit(s) r/w name function 31:0 r/w pci address this longword is the physical pci address of dac2 sample buffer in system memory dac2 frame register 2 address 3ch addressable as longword memory page 1100b power on reset value xxxxxxxxh direct mapped bit(s) r/w name function 31:16 r/w current count this 16 bit counter indicates the number of longwords that have been transferred. 15:0 r/w buffer size this 16 bit value indicates the number of longwords in a buffer minus one.
ensoniq proprietary information ensoniq proprietary information ensoniq audiopci 97 specification rev 1.1 oct 1, 1997 28 adc frame register 1 address 30h addressable as longword memory page 1101b power on reset value xxxxxxxxh direct mapped bit(s) r/w name function 31:0 r/w pci address this longword is the physical pci address of adc sample buffer in system memory adc frame register 2 address 34h addressable as longword memory page 1101b power on reset value xxxxxxxxh direct mapped bit(s) r/w name function 31:16 r/w current count this 16 bit counter indicates the number of longwords that have been transferred. 15:0 r/w buffer size this 16 bit value indicates the number of longwords in a buffer minus one. uart fifo register address 30, 34, 38, 3ch addressable as longword memory pages 1110, 1111b power on reset value xxxxxxxxh direct mapped bit(s) r/w name function 31:9 r/w open these bits are not used. 8 r/w byte valid this bit indicates whether the uart byte contains valid data. 0 - uart byte not valid 1 - uart byte valid 7:0 r/w uart byte this byte is a byte the has been received by the uart block through the midi interface.
ensoniq proprietary information ensoniq proprietary information ensoniq audiopci 97 specification rev 1.1 oct 1, 1997 29 8. power management all power management of the system is under software control. the ac97 codec and audiopci 97 can be powered down separately. neither chip loses register information when powered down. the audiopci 97 can be power managed by shutting down various sub-systems. the following blocks can be individually powered down: joystick, uart, and serial interface. although these blocks can be individually disabled this will not save an appreciable amount of power. audiopci 97 can also individually internally shut down the pci clock and the crystal input clock. the pci clock when shut down will still be active to the pci and interrupt/chip select modules. the crystal clock when shut down will be shut down for all internal modules as well as the output connection to the ac97 codec. during operation, the audiopci 97 asic will have a typical power dissipation of 150mw. in power down, the audiopci 97 asic will have a typical power dissipation of 15mw. 8.1. codec power management the ac97 codec ? s are powered down by setting bit 1 (of control bits 7 - 0) in control register 16 (hex) to a zero. the ac97 codec control registers are written through the codec interface block at address 14 (hex). for details refer to the ac97 specification and also the codec interface section (7.5) of this specification. 8.2. audiopci power management as mentioned above, the joystick, uart, and serial interface modules of the audiopci 97 chip can be individually powered down. the remaining modules will be in a powered up condition. the audiopci 97 modules are powered down by setting bits 6 - 2 (of control bits 31 - 0) to zero. the audiopci 97 control register is located in the irq and chip select block at address 00 (hex). for details refer to the irq and chip select block section (7.1) of this specification. note that the serial interface actually has three separate enable bits, one for each of the playback channels and one for the record channel. although these blocks can be individually disabled this will not save an appreciable amount of power. audiopci 97 can also individually internally shut down the pci clock and the crystal input clock. the pci clock when shut down will still be active to the pci and interrupt/chip select modules. the crystal clock when shut down will be shut down for all internal modules as well as the output connection to the ac97 codec.
ensoniq proprietary information ensoniq proprietary information ensoniq audiopci 97 specification rev 1.1 oct 1, 1997 30 9. pci bus description and signals audiopci 97 is designed to adhere to the pci local bus specification revision 2.2, as such it complies with all requirements for bus master capability. it is a 32 bit device and does not currently support the optional 64 bit bus modes. of the optional pins described in the pci specification, audiopci 97 only uses interrupts. although the sample buffer space is referred to as cache, it is not the system memory cache described in the pci specification. this cache is a local sound memory cache and is not part of the directly accessible system memory. note: the ? # ? symbol indicates a low active signal. 9.1. parity audiopci 97 implements the par signal. this signal is an even parity check described in the pci specification. audiopci 97 will generate par whenever it drives ad[31:0]. although audiopci will generate par , it will not generate the bus error condition signals perr# and serr# due to parity errors on data received. this exception is allowed in the pci specification section 3.8.2. 9.2. lock# audiopci 97 does not support pci bus lock functions. 9.3. bus speed since audiopci 97 uses a high speed intermediate buffer to transfer data to and from the pci bus, it runs at the standard 33 mhz. rate. however, it is believed that the memory speed on the pci bus may limit the transaction rate by inserting one wait state. all latency calculations are based on this assumption.
ensoniq proprietary information ensoniq proprietary information ensoniq audiopci 97 specification rev 1.1 oct 1, 1997 31 10. pin description 10.1. pci interface the pci interface follows the information presented on the pci local bus specification revision 2.2. for a more complete description of each of the pci signal please refer to the pci specification. clk clock: a 33mhz input signal from the pci bus. this is the master timing control for all pci transfers. rst# reset: the device will essentially be in sleep mode after reset. ad[31:0] the address/data multiplexed signals of the pci bus. c/be#[3:0] bus command and byte enables. defines the type of transfer that will take place. frame# cycle frame. driv en by the current bus master, this signal indicates the beginning of a transfer. when frame# is deasserted, the transaction is in the final phase. irdy# initiator ready. this signal indicates that the initiating agent (the bus master) is able to accept the data phase of the transaction. normally used to create wait states by the master. trdy# target ready. driven by the target (the selected device), this signal indicates that the target is ready for the data transaction. generally used to generate wait states by the target. stop# stop indicates the current target is requesting the master to stop the current transaction. serr# system error. this pin is an output only pin on the ES1371. par the parity signal is even parity. the number of ? 1 ? s on ad[31:0],c/be[3:0] and par equal an even number. idsel initialization device select. this signal is used as a chip select during configuration read and write transactions devsel# device select. this signal, when actively driven, indicates that the driving device has decoded its address as the target of the current transaction. req# request indicates to the arbiter that audiopci 97 desires use of the bus. gnt# grant. this signal indicates that control of the pci bus has been granted and audiopci 97 is now the bus master. inta# audiopci 97 supplies interrupt support for all possible interrupt configurations. this is done so that the greatest possible flexibility can be achieved during the configuration process. pme# power management enable. this signal is not impl emented in the ES1371. it is an output only and will be set high. it should be left as a no connect on a pc board. 10.2. ac97 codec interface sdataout serial data to ac97 codec sync sync output to ac97 codec sdatain serial data from ac97 codec bclk bit clock from ac97 codec
ensoniq proprietary information ensoniq proprietary information ensoniq audiopci 97 specification rev 1.1 oct 1, 1997 32 10.3. miscellaneous jystk[7:0] joystick and button inputs midi_out serial output for midi compatible communications midi_in serial input for midi compatible communications xtali/o crystal input and output xtalobuf crystal output buffered (for co nnection to ac97 codec) gpio[3:0] general purpose input/output port. these pins have internal pullups. i2s_lrclkin external source i2s left/right clock input. no internal pullup/pulldown. i2s_bclkin external source i2s bit clock input. no internal pullup/pulldown. i2s_serin external source i2s serial data input. no internal pullup/pulldown. 10.4. power supplies vdd digital supply voltage (+5v) vss digital ground pins
ensoniq proprietary information ensoniq proprietary information ensoniq audiopci 97 specification rev 1.1 oct 1, 1997 33 11. pinout. vss jystk0 jystk1 jystk2 jystk3 vss vdd jystk4 jystk5 jystk6 jystk7 midi_out midi_in vss xtalo xtali vss xtalobuf vdd sdataout bclk sdatain sync vss gpio3 gpio2 gpio1 gpio0 i2s_lrclkin vss vdd cbe3# ad24 ad25 ad26 vss ad27 ad28 ad29 ad30 vss ad31 pme# req# gnt# vdd pci_clk vss rst# inta# ensoniq ac97 ES1371 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 80 79 78 77 76 75 74 73 72 71 70 69 68 67 66 65 64 63 62 61 60 59 58 57 56 55 54 53 52 51 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 100 99 98 97 96 95 94 93 92 91 90 89 88 87 86 85 84 83 82 81 vss idsel ad23 ad22 ad21 vss ad20 ad19 ad18 ad17 vss vdd ad16 cbe2# frame# irdy# vss trdy# devsel# stop# serr# par cbe1# ad15 vdd vss ad14 ad13 ad12 ad11 vss ad10 ad9 ad8 cbe0# vss vdd ad7 ad6 ad5 ad4 vss ad3 ad2 ad1 ad0 vss i2s_serin i2s_bclkin vdd
ensoniq proprietary information ensoniq proprietary information ensoniq audiopci 97 specification rev 1.1 oct 1, 1997 34 12. timing. audiopci 97 is being designed to conform to the pci local bus specification revision 2.2. since audiopci 97 has a high speed intermediate 8 lword ram buffer, the design target is to have no wait states on the data transfers. this level of performance is currently being evaluated. for detailed information on the pci timing for audiopci 97 please refer to section 3.3 bus transactions in the pci specification. the timing information for the signals from the audiopci 97 to the ac97 codec can be found in the audio codec ? 97 component specification. 13. dc characteristics the dc characteristics for audiopci 97 conform to the dc specification for the pci bus.
ensoniq proprietary information ensoniq proprietary information ensoniq audiopci 97 specification rev 1.1 oct 1, 1997 35 14. mechanical information
ensoniq proprietary information ensoniq proprietary information ensoniq audiopci 97 specification rev 1.1 oct 1, 1997 36 c d e f g h 1 b a 31 51 81 j k l m n o qfp 100 plastic package 100 pin flat pack millimeters inches min max min max dim a b c d e f g h j k l m n o 23.65 24.15 0.951 0.931 19.90 20.10 0.791 0.783 14.10 13.90 0.555 0.547 17.65 0.695 18.15 0.715 0.65 0.65 0.026 0.026 0.20 0.40 0.008 0.016 1.95 1.95 0.077 0.077 2.57 0.101 2.87 0.113 0.65 0.026 0.95 0.037 0.20 0.30 0.008 0.012 0.45 0.55 0.018 0.022 -10 to 0 degree's 0.15 0.15 0.006 0.006 0.10 0.004 0.40 0.016
ensoniq proprietary information ensoniq proprietary information ensoniq audiopci 97 specification rev 1.1 oct 1, 1997 37 15. appendix 15.1. bus latency since each audio channel has a 64 byte buffer, the latency requirement for the pci bus can be calculated as follows: for 8 bit audio: 32 samples (one half buffer) @ 44.1 khz. = 725 m sec. for 16 bit audio: 16 samples @ 44.1 kh z. = 363 m sec. therefore, once a bus request is made, audiopci 97 needs to have the pci bus grant in 363 m sec. for 16 bit samples. in most game environments the sound effects are 8 bit and the high latency figure is acceptable. if more than one channel needs servicing, this does not impact the latency calculation because once the pci bus is granted it can be held until all channels are serviced. since audiopci 97 uses 8 long word burst transfers, each channel is filled with one burst transfer and audiopci 97 can service all three with just 24 transfers. 15.2. bus bandwidth the bus bandwidth required by audiopci is very low. if all three channels are running at 44.1 khz the total bandwidth is: 44.1 khz 2 (stereo) 3 (channels) 2 (bytes) = 529 kbytes/sec. this represents less than 0.5% of the available pci bus bandwidth.

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