View CMI-8738PCI-6CH_1793138.PDF datasheet online --- IC-ON-LINE

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c-media electronics inc. tel:886-2-87731100 fax:886-2-87732211 url : www.cm edia.com.tw products and company names mentioned here are t he trademarks of their respective owners. cmi-8738/pci-6ch series audio chip specification 1 with high speed pci v2.1 bus controller and legacy audio sbpro ? dspemulator,cmi8738 is designed for pc add-in cards and all-in-one motherboards. no external codec is needed in cmi8738: cmi-8738 supports the legacy audio ? sbpro?, fm emulator/dls wavetable music synthesis, and hrtf 3d positional audio functions . drivers support eax ? , karaoke key , echo ??functions. above a ll cmi8738 supports pctel? hsp56 (1789) interface. being compatible with a3d? and directsound? 3d, cmi8738 meets pc99? requirem ents, and supports professional digital audio interface such as 24-bit spdif in (0.5v ~ 5v)and out(44.1k and 48k format) . cmi8738 uses hrtf 3d extension technology to enhance traditional hrtf 3d positional audio by substituting two-speaker system by four or six - speaker one (it supports additional 2 ch 16-bit dac to provide rear side audio and another 2 ch for subwoofer/center). it greatly improves hrtf 3d positional audio quality and successfully removes the sweet spot limitations: users can enjoy genuine 3d audi o gaming effects, and don't have to worry about the environmental confinement any more. being outstanding for its full au dio functions, competitive price, and power management, cmi-8738 is the best choice for people seeking for optimum us e of the pc applications. c-media licensed hrtf 3d library from central research lab (crl?), u.k , who provides one of the world's best hrtf libraries (crl? also licensed its audio technology to yamaha?, ess?, and other well-known sound chip makers). features 6ch dac for ac3 ? 5.1ch purpose . hrtf-based 3d positional audio , supporting directsound? 3d and a3d? interface supports 4.1/5.1 speakers, c3d x positional audio in 4 / 6 ch speaker mode legacy audio sbpro ? compatible dls -based wavetable music synthesizer, supports directmusic? professional digital audio interface supporting 24-bit spdif in and out (44.1k and 48k format) built-in 32ohm earphone buffer built-in pctel? hsp56 modem? interface drivers support eax ? , karaoke key, echo? mpu-401 port/ dual game port 16-bit full duplex codec built-in zv port 32-bit pci bus master external e2prom interface single chip design, digital power +3.3v, analog power +5v, 128 pins qfp rev. 1.8f cmi-8738/pci-6ch c3dx series pci-based hrtf 3d extension positional audio chip hsp56 modem interface cmi-8738/pci block diagram pci interface pci bus dma engine irq control legacy audio sbpro?emu. spdif in and out mpu 401 and game port music synthesizer hrtf dsp engine 16-bit codec analog mixer pll and timing circuit 14. 3 1 8 mhz earphone buffer line out (front l/r) mic amp line / cd / a ux / pcpsk in mic in rear l/r center / bass zv port
c-media electronics inc. tel:886-2-87731100 fax:886-2-87732211 url : www.cm edia.com.tw products and company names mentioned here are t he trademarks of their respective owners. cmi-8738/pci-6ch series audio chip specification 2 cmi8738/pci-6ch c3dx series chip function list model modem spdif/zvport cmi8738/pci-6ch yes yes cmi8738/pci-6ch-mx no yes cmi8738/pci-6ch-lx no no
c-media electronics inc. tel:886-2-87731100 fax:886-2-87732211 url : www.cm edia.com.tw products and company names mentioned here are t he trademarks of their respective owners. cmi-8738/pci-6ch series audio chip specification 3 u1 cmi8738 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 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 31 101 100 99 98 97 96 95 94 93 92 91 90 89 88 87 86 85 84 83 82 81 80 79 78 77 76 75 74 73 72 32 33 34 35 36 37 38 39 40 41 42 43 44 128 127 126 125 124 123 1 65 66 67 68 69 70 71 102 xaferst xsclk xhspfs xhspsdi xhspsdo xafemclk xbio3 xbio2 xbio1 xzvclk xspdifi2/zvlrck xmdsel vcore gnd xinta xintb xprst xclk33 xgnt xreq xadoutl nc xintvref avdd agnd extbass xmout xmin xout xin vcore gnd xa0 xa1 xa2 xa3 xa4 xa5 gnd vdd xa27 gnd vdd xa26 xa25 xa24 xcbe3 xidsel vdd gnd xa23 xa22 xa21 xa20 xa19 gnd vdd xa18 a17 xa16 xcbe2 xframe xirdy xtrdy xdevsel vdd gnd xstop xpar xcbe1 xring vddm dgnd xspdifo xgd7 xgd6 xgd5 xgd4 xgd3 xgd2 xgd1 xgd0 xrxd xtxd xgpbio xspdifi/zvsdi xmbcsz xeecs vdd5v agnd avdd xmicin xpcspkin xauxr xauxl xlnr xlnl xrearr xrearl xcdr xa15 xa14 xa13 xa12 gnd vdd xa11 xa10 xa9 xa8 xcbe0 xa7 xa6 xa29 xa30 xa31 gnd vdd xpme xa28 xadoutr xadchl xadchr xadoutc xadoutb xcdg xcdl xoffhook pinout pinout cmi8738/pci-6ch c3dx audio chip qfp 128 pins
c-media electronics inc. tel:886-2-87731100 fax:886-2-87732211 url : www.cm edia.com.tw products and company names mentioned here are t he trademarks of their respective owners. cmi-8738/pci-6ch series audio chip specification 4 digital pin description name number pin type definition xa31-xa0 126-128,1-2,5-7,12-16,19-21,32 -35,38-41,43-44,47-52 i/o pci bus address and data lines xinta 117 o interrupt request , active-low. xintb 118 o independent modem interrupt request (optional; unused) xprst 119 i reset xclk33 120 i pci bus clock. xgnt 121 i bus master grant, active-low. xreq 122 o bus master request, tri-state output, active-low. xpme 123 o power management event pin (optional; unused) xidsel 9 i id select, active-high. xframe 23 i/o cycle frame, active-low. xirdy 24 i/o initiator ready, active-low. the bus master device is ready to transmit or receive data xtrdy 25 i/o target ready, active-low. the target device is ready to transmit or receive data xdevsel 26 i/o device select, active-low. the target device has decoded the address of the current transaction as its own chip select range. xstop 29 i/o stop transaction, active-low. the target device request to the master to stop the current transaction. xpar 30 i/o parity. the pin indicates even parity across xa31-xa9 and xcbe3-0 for both address and data phases. xcbe3,2,1,0 8,22,31,42 i/o mult iplexed command/byte enable. these pins indicate cycle type during the address phase of a transaction. vdd 4,10,18,27,37,45,124 +3.3v/ +5v pci i/o power pin vcore 54,115 +3.3v core digital circuit power pin gnd 3,11,17,28,36,46, 53,116,125 gnd digital and pci i/o ground xin 55 i 14.318mhz crystal, or external clock input xout 56 o 14.318mhz crystal xgd7-xgd4 97-94 i game port switch input pin. switch d to switch a xgd3-xgd0 93-90 i/o game port resistor input pin. rc3 to rc0 xtxd 88 o midi transmit data xrxd 89 i midi receive data xspdifo 98 o 44.1k/48khz spdif output xspdifi 86 i 44.1k/48khz spdif input xspdif2 113 i secordary spdif input (5v only) xbio3-xbio 0 109-112 i/o general purpose i/o vdd5v 83 +5v pci i/o power pin pin description
c-media electronics inc. tel:886-2-87731100 fax:886-2-87732211 url : www.cm edia.com.tw products and company names mentioned here are t he trademarks of their respective owners. cmi-8738/pci-6ch series audio chip specification 5 vddm 100 +3.3v/ +5v pci i/o power pin dgnd 99 gnd pci i/o ground xeecs 84 o eeprom chip select xgpbio 87 o general purpose i/o pin (default=high) xmdsel 114 i modem device enable(high:enable) xring 101 i ring detection input xoffhook 102 o off-hook control output xaferst 103 o reset signal for modem daa xhspfs 105 o daa frame sync xhspsdi 106 i daa data input xhspsdo 107 o daa data output xafemclk 108 o daa master clock xsclk 104 o daa serial clock xmout 58 o modem crystal output (18.432mhz) xmin 57 i modem crystal input xmbcsz 85 i audio chip select (low:enable) zvclk 112 i zv port clock zvlrck 113 i zv port lr channel clock zvsdi 86 i zv port data input pin description
c-media electronics inc. tel:886-2-87731100 fax:886-2-87732211 url : www.cm edia.com.tw products and company names mentioned here are t he trademarks of their respective owners. cmi-8738/pci-6ch series audio chip specification 6 avdd 61,81 +5v analog power agnd 60,82 gnd analog ground xadoutl-r 64,65 ai/o line out (front channels l/r) xadchl-r 66,67 ai/o adc sample hold pin xadoutc 68 ai/o center channel output xadoutb 69 ai/o bass channel output xintverf 62 ao internal reference voltage (for testing only) nc 63 - not connect xcdl-r xcdgnd 71,72,70 ai cd audio differential input xlnl-r 75,76 ai line in or rear channels out xauxl-r 77,78 ai aux. line in xpcspkin 79 ai pc beep signal or mono in xmicin 80 ai microphone in xrearl-r 73,74 ao rear channels l/r out extbass 59 ai external bass channel input name number definition xeecs 84 4/6 channel selection. for 4 or 6 channel purpose selection. this pin tie high mean 6ch, pull down compatible with 4ch chip. pin description analog pin description power on configuration pin
c-media electronics inc. tel:886-2-87731100 fax:886-2-87732211 url : www.cm edia.com.tw products and company names mentioned here are t he trademarks of their respective owners. cmi-8738/pci-6ch series audio chip specification 7 electrical characteristics absolute maximum ratings ratings symbol value units digital power voltage vdd vdd 5% v analog power voltage avdd avdd 5% v operating temperature range to 0 to 70 c storage temperature range tst -40 to 125 c maximum power dissipation pdmax 300 mw digital characteristics parameter symbol min typ max unit input high voltage(pci i/o) vih 2. vdd+0.3 v input low voltage (pci i/o) vil -0.5 0.8 v output high voltage voh 2.4 vdd v output low voltage vol 0.0 0.2 0.4 v spdif in input high voltage vih1 2.6 v spdif in input low voltage vil1 2.4 v spdif output high voltage voh1 vdd v spdif output low voltage vol1 gnd v output low current 4 8 ma audio characteristics parameter symbol min typ max unit analog input voltage avin 1.1 vrms analog output voltage avout 1.1 vrms a-a s/n ratio 85 db a-a thd 0.02 % adc s/n ratio 72 db adc thd 0.1 % dac s/n ratio 85 db dac thd 0.05 % spdif in/out s/n ratio 120 db spdif in/out thd 0 % microphone input level 20 200 mv microphone booster 20 db electrical characteristics
c-media electronics inc. tel:886-2-87731100 fax:886-2-87732211 url : www.cm edia.com.tw products and company names mentioned here are t he trademarks of their respective owners. cmi-8738/pci-6ch series audio chip specification 8 pci configuration spaces (audio) 00 h 13f6 : ( vender id ) read only 02 h 0111 : (device id) read only 04 h 0006 : command (state after #rst all is ? 0 ?) 0 (bit 9) fast back-to-back enable 0 (bit 8) #serr enable (r/w) 0 (bit 7) wait cycle control 0 (bit 6) parity error response 0 (bit 5) vga palette snoop 0 (bit 4) memory write and invalidate enable 0 (bit 3) special cycles 1 (bit 2) bus master (r/w) 0 (bit 1) memory space 1 (bit 0) i/o space (r/w) 06 h 0280 : status 0 (bit 15) detected parity error 0 (bit 14) signaled system error 0 (bit 13) received master abort 0 (bit 12) received target abort 0 (bit 11) signaled target abort 01 (bits 10-9) devsel timing 00-fast, 01-medium, 10-slow 0 (bit 8) data parity error detected 1 (bit 7) fast back-to-back capable 0 (bit 6) udf supported 0 (bit 5) 0-33mhz ,1-66mhz capable 00000 (bits 4-0) reserved 08 h 10 : revision id 09 h 040100 : audio device 0c h 00 : cache line size 0d h 20 : latency timer 0e h 80 : header type 0f h 00 : bist pci configuration spaces
c-media electronics inc. tel:886-2-87731100 fax:886-2-87732211 url : www.cm edia.com.tw products and company names mentioned here are t he trademarks of their respective owners. cmi-8738/pci-6ch series audio chip specification 9 10 h 0000d401 : i/o of length : -65280(ffff0100h) : first base address register 14 h 00000000 : uninitialized : second base address register 18 h 00000000 : uninitialized : third base address register 1c h 00000000 : uninitialized : fourth base address register 20 h 00000000 : uninitialized : fifth base address register 24 h 00000000 : uninitialized : sixth base address register 28 h 00000000 : cardbus cis pointer 2c h 13f6 : ( subsystem vender id ) (r/w) 2e h ffff : subsystem id (r/w) 30 h 00000000 : expansion rom base address 34 h 00000000 : reserved 38 h 00000000 : reserved 3c h 05 : interrupt line 3d h 01 : interrupt pin 3e h 02 : min grant 3f h 18 : max latency 40 h 06020001: power management reg. pci configuration spaces
c-media electronics inc. tel:886-2-87731100 fax:886-2-87732211 url : www.cm edia.com.tw products and company names mentioned here are t he trademarks of their respective owners. cmi-8738/pci-6ch series audio chip specification 10 pci configuration spaces (modem) 00h 13f6: (vender id) read only 02h 0211: (device id) read only 04h command (state after #rst all is "0") 0 (bit 9) fast back-to-back enable (read only) 0 (bit 8) #serr enable (read only) 0 (bit 7) wait cycle control (read only) 0 (bit 6) parity error response (read only) 0 (bit 5) vga palette snoop (read only) 0 (bit 4) memory write and invalidate enable (read only) 0 (bit 3) special cycles (read only) 0 (bit 2) bus master (read only) 0 (bit 1) memory space (r/w) 1 (bit 0) i/o space (read only) 06h status 0 (bit 15) detected parity error 0 (bit 14) signaled system error 0 (bit 13) received master abort 0 (bit 12) received target abort 0 (bit 11) signaled target abort 01 (bits 10-9) devsel timing 00-fast, 01-medium, 10-slow 0 (bit 8) data parity error detected 0 (bit 7) fast back-to-back capable 0 (bit 6) udf supported 0 (bit 5) 0-33mhz, 1-66mhz capable 1 (bit 4) pci power down enable status 0000 (bits 3-0) reserved 08h x20: revision id 09h x078000: communication device (modem) 0ch x00: cache line size 0dh x00: latency timer oeh x80: header type (multifunction device) ofh x00: bist pci configuration spaces
c-media electronics inc. tel:886-2-87731100 fax:886-2-87732211 url : www.cm edia.com.tw products and company names mentioned here are t he trademarks of their respective owners. cmi-8738/pci-6ch series audio chip specification 11 10h xbbbbb000: allocate 32 double word i/o space. 14h x00000000: not used - second base address register 18h x00000000: not used - third base address register 1ch x00000000: not used- four base address register 20h x00000000: not used- fifth base address register 24h x00000000: not used- sixth base address register 28h x00000000: card bus cis pointer 2ch x13f6: sub-system vender id (value can be replaced after reset.) (r/w) 2eh x0211: sub-system id (value can be replaced after reset) (r/w) *refer to the audio pci registers bit-13 of address (18-1b) for how to replace. 30h x00000000: expansion rom base address 34h x00000040: pointer to the power-saving registers. (read only) 38h x00000000: reserved 3ch x00: interrupt line (r/w) 3dh interrupt pin(x01 share interrupt/x02 not share interrupt with audio) *select from the power on pin configuration 3eh x00: min grant(not used) 3fh x00: max latency(not used) 40h xec420001(read only) 44h-47h b0-b1: pmst (r/w) (00) b7-b2: all 0 (read only) b8: pmeen (r/w) (sticky bit) b12-b9: dsel (r/w) 0000 b14-b13: all 0 (read only) b15: pmests (sticky bit) pci configuration spaces
c-media electronics inc. tel:886-2-87731100 fax:886-2-87732211 url : www.cm edia.com.tw products and company names mentioned here are t he trademarks of their respective owners. cmi-8738/pci-6ch series audio chip specification 12 internal register mapping function control register 0 address 00 h bit(s) r/w name description 31:20 reserved. 19 rst_ch1 channel 1, 1->reset (default 0) 18 rst_ch0 channel 0, 1->reset (default 0) 17 chen1 channel 1, 1->enabled, 0->disabled. 16 chen0 channel 0, 1->enabled, 0->disabled. 15-2 reserved 3 pause1 channel 1, 1->pause if channel1 is enabled. 2 pause0 channel 0, 1->pause if channel0 is enabled. 1 chadc1 channel 1, 1->recording, 0->playback 0 chadc0 channel 0, 1->recording, 0->playback function control register 1 address 04 h bit(s) r/w name description 31-16 reserved 15:13 dsfc[2:0] channel 1 sampling frequency selection 0 0 0 5.512 k 0 0 1 11.025 k 0 1 0 22.05 k 0 1 1 44.1 k 1 0 0 8 k 1 0 1 16 k 1 1 0 32 k 1 1 1 48 k 12:10 asfc[2:0] channel 0 sampling frequency selection 0 0 0 5.512 k 0 0 1 11.025 k 0 1 0 22.05 k 0 1 1 44.1 k 1 0 0 8 k pci register
c-media electronics inc. tel:886-2-87731100 fax:886-2-87732211 url : www.cm edia.com.tw products and company names mentioned here are t he trademarks of their respective owners. cmi-8738/pci-6ch series audio chip specification 13 1 0 1 16 k 1 1 0 32 k 1 1 1 48 k 9 spdf_1 spdif in/out at channel b at 44.1k double-words/sec. 8 spdf_0 spdif out only at channel a at 44.1k double-words/sec. 7 spdfloop external spdif/in loopback to external spdif/out . 6 spdo2dac spdif/out can be heard from internal dac. 5 intrm interrupt mask bit for mcb (master control block) module interrupt. 0 mcb interrupt disabled. 1 mcb interrupt enabled. 4 breq if this bit is set low it will prevent the mcb and dac/adc block from accessing the memory. 0 bus master request disabled(power on state) 1 bus master request enabled. 3 voice_en this bit enables legacy voice device(sb16,fm). 0 legacy voice disabled on channel 0. 1 legacy voice enabled on channel 0. 2 uart_en this bit enables legacy uart device. 0 uart disabled 1 uart enabled 1 jystk_en this bit en ables legacy joystick device. 0 joystick disabled 1 joystick enabled 0 zvport enable zvport, default 0 disable. channel format register address 08 h bit(s) r/w name description 31 chb3d5c enable 5 channels sound at channel b. 30 fmoffset2 when fmute=1, set this bit will initial fm pcm to offset 2 instead of zero, default 0 29 chb3d enable 4 channels sound at channel b. 28-24 versionid read only. ?00? 23 setlat48 set latency timer 48\h 22 edgeirq when ?1?, enable emul ated edge trigger legacy irq to pci bus #inta, default 0 21 spd24sel when ?1?, and spd32sel=1 enable spdifout to play 24bit wave
c-media electronics inc. tel:886-2-87731100 fax:886-2-87732211 url : www.cm edia.com.tw products and company names mentioned here are t he trademarks of their respective owners. cmi-8738/pci-6ch series audio chip specification 14 stream, default ?0? 20-16 reserved 15-14 adcbitlen[1:0] sample resolution 00 16 bits per sample . (default) 01 15 bits per sample. 10 14 bits per sample. 11 13 bits per sample. 13-12 adcdlen sample method. ?00? (default) original mode ?01? extra mode. ?10? 24k/22k mode. ?11? weight mode. 11 ch1 double sample rate from 48k to 96k. 10 ch1 double sample rate from 44.1k to 88.2k. 9 ch0 double sample rate from 48k to 96k. 8 ch0 double sample rate from 44.1k to 88.2k. 7 invspdifi invert xspdifi signal for reve rse spdif stream format, default ?0?. 6 dblspds double spdif sampling rate to 96k, 88.2k when set this bit, default ?0?. 5 polvalid inverse spdif/in valid bit, default 0. 4 spdlocked a low active pulse to set read back status bit to ?1?. when write ?1? to it will clear this bit to ?0?. 3:2 ch1fmt[1:0] data format of channel 1 00 8 bit mono mode 01 8 bit stereo mode 10 16 bit mono mode 11 16 bit stereo mode 1:0 ch0fmt[1:0] data format of channel0 00 8 bit mono mode 01 8 bit stereo mode 10 16bit mono mode 11 16 bit stereo mode interrupt hold/clear register address 0c h bit(s) r/w name description 31:24 r versionid ?08? default
c-media electronics inc. tel:886-2-87731100 fax:886-2-87732211 url : www.cm edia.com.tw products and company names mentioned here are t he trademarks of their respective owners. cmi-8738/pci-6ch series audio chip specification 15 ?09? pcb id set. ?0a? bound id set. ?0b? both pcbid and bound id set 23:19 reserved 18 tdma_int_en interrupt hold/ clear bits for updating tdma position 0 interruupt clear 1 interrupt hold if exist. 17 ch1_int_en interrupt hold/clear bits for the channel 1. 0 interrupt clear 1 interrupt hold if exist. 16 ch0_int_en interrupt hold/clear bits for the channel 0. 0 interrupt clear 1 interrupt hold if exist. 15:0 reserved interrupt register address 10 h bit(s) r/w name description 31 r intr interrupt reflected from any sources. 0 no interrupt 1 interrupt pending 30:28 reserved 27 r vco 26 r mcbint abort conditions occur during pci bus target/master access. 0 no interrupt 0 interrupt pending 25:17 reserved 16 r uartint this bit is the uart interrupt bit. 0 no uart interrupt 1 uart interrupt pending 15: r ltdmaint interrupt fo r updating low channel tdma position. 0 no interrupt 1 interrupt pending 14 r htdmaint interrupt for updation high channel tdma position. 0 no interrupt. 1 interrupt pending. 13:8 reserved
c-media electronics inc. tel:886-2-87731100 fax:886-2-87732211 url : www.cm edia.com.tw products and company names mentioned here are t he trademarks of their respective owners. cmi-8738/pci-6ch series audio chip specification 16 7 r xdo46 direct programming eepro m interface , read data register 6 r lhbtog high/low stat us from dma ctrl register. 5 r leghdma legacy is in high dma channel. 4 r legstereo legacy is in stereo mode. 3 r ch1busy channel b busy. 2 r ch0busy channel a busy. 1 r chint1 channel b interrupt. 0 no interrupt 1 interrupt pending 0 r chint0 channel a interrupt. 0 no interrupt 1 interrupt pending legacy control/status register address 14 h bit(s) r/w name description 31 nxchg don?t map base register from dword to sample, default 0. 30:29 vmpu [1:0] base address for mpu401 access 00 base address : 330h 01 base address : 320h 10 base address : 310h 11 base address : 300h 28 enwr8237 enable bus master to write 8237 base register, default 0. 27:26 vsbsel[1:0] the base address select for sb16 access. 00 base address: 220h 01 base address: 240h 10 base address: 260h 11 base address: 280h 25:24 fmsel[1:0] the base address select for fm access. 00 base address : 388h 01 base address : 3c8h 10 base address : 3e0h 11 base address : 3e8h 23 enspdout enable xspdif/out to i/o interface 22 spdcopyrht spdif in/out copyright status bit 21 dac2spdo enable wave+fm+midi to spdif/out interface 20 invidwen internal vendor id write enable when ?1?. (default0)
c-media electronics inc. tel:886-2-87731100 fax:886-2-87732211 url : www.cm edia.com.tw products and company names mentioned here are t he trademarks of their respective owners. cmi-8738/pci-6ch series audio chip specification 17 19 c_eeaccess direct programmi ng eeprom interface registers. 18 c_eecs 17 c_eedi46 16 c_eeck46 15 chb3d6c enable six-channel sound on channel-b (chb3d5c has to be set first) 14 centr2lin line-in as center channel out 13 base2lin line-in as bass channel out 12 exbasen external bass input enable 11-0 reserved micellaneous control register address 18h bit(s) r/w name description 31 pwd power down mode enabled.. 30 reset reset bus master/dsp engine. 29 reserved 28 vmgain additional analog master amp. +6db gain control 0 disabled, default setting 1 enabled (boost +6db gain, only valid if the master volume registers have been set with 0xffh max. value.) 27 reserved 26 n4spk3d hardware copy front channel to rear channel 25 spdo5v spdif-out level setting 24 w / spdif48k ; r / spatus48k ; 23 endbdac default low, high will enable double dac structure. 22 xchgdac default low, 0 ch0 > front spkr, ch1 > back spkr. 1 ch0 > back spkr, ch1 > front spkr. 21 spd32sel when high, support 32bits spdif format ,low 16bits 20 spdfloopi internal spdif/out loopback to internal spdif/in, for loopback testing 19 fm_en legacy fm enabled. 18 ac3_en enable ac3 control register in spdifout format, default 0. 17 reserved 16 enwrasid setting high choose to use the writable internal subid in the configuration space of the audio function.
c-media electronics inc. tel:886-2-87731100 fax:886-2-87732211 url : www.cm edia.com.tw products and company names mentioned here are t he trademarks of their respective owners. cmi-8738/pci-6ch series audio chip specification 18 15 spdf_ac97 0: spdif/out 44.1k 1:spdif/out 48k(share with ac97 transfer) 14 mask_en activate channel mask on legacy dma. 0 disabled 1 enabled 13 enwrmsid setting high choose to use the writable internal subid in the configuration space of the modem function. 12-9 reserved 8 selspdifi2 select secondary spdif in , default 0. 7 encenter enable center channel, default 0. 6 mutech1 mute pci channel 1 to analog dac. 5 reserved 4 midsmp enable 1/2 interpolation at the front end dac.. 3:2 upddma[1:0] for every the number of samples to notify updating tdma position. 00 every 2048 samples 01 every 1024 samples 10 every 512 samples. 11 every 256 samples. 1 twait1 the length of fm i/o cycle in unit of pciclk. 0 48 pciclks. 1 64 pciclks. 0 twait0 the length of i/o cycle but fm in unit of pciclk. 0 4 pciclks. 1 6 pciclks. t - dma position address 1ch bit(s) r/w name description 31:16 r tdmacn t current byte/word count of dma channel. 15:0 r tdmaadr current address of dma channel. mixer control / device configure register (can be accessed only by byte instruction)
c-media electronics inc. tel:886-2-87731100 fax:886-2-87732211 url : www.cm edia.com.tw products and company names mentioned here are t he trademarks of their respective owners. cmi-8738/pci-6ch series audio chip specification 19 address 20 h bit(s) r/w name description 7:0 w sbvr[7:0] programmable sb16 version no. r dev[7:0] hardwire device version no. address 21 h bit(s) r/w name description 7-3 reserved 2 x_adpcm sb16 adpcm enable,default disabled. 1 proinv sbpro left/right channel switching. 0 x_sb16 indicate device active as sb16 compatible, default sb16 address 22 h bit(s) r/w name description 7:0 idxdata mapping sb compatible mixer index register data port(a2x5h) address 23 h bit(s) r/w name description 7:0 idxaddr mapping sb compatible mixer index register address port(a2x4h) address 24 h bit(s) r/w name description 7 fmmute mute fm 6 wsmute mute wave stream 5 rear2lin route rear ch. out put to line-in. default 0. 4 rear2front exchange rear and front channels?s speaker out 3 waveinl digital wave recording left channel 2 waveinr digital wave recording right channel 1 x3den 3d surround enable. 0 cdplay spdif/in pcm to dac enable address 25 h bit(s) r/w name description 7 rauxren recording source select r-aux 6 rauxlen recording source select l_aux 5 vauxrm r-aux mute control
c-media electronics inc. tel:886-2-87731100 fax:886-2-87732211 url : www.cm edia.com.tw products and company names mentioned here are t he trademarks of their respective owners. cmi-8738/pci-6ch series audio chip specification 20 4 vauxlm l-aux mute control 3:1 vadmic[2:0] recording mic volume control 0 micgainz mic gain c ontrol,default high disable address 26 h bit(s) r/w name description 7:4 vauxl[3:0] l-aux volume control 3:0 vauxr[3:0] r-aux volume control address 27 h bit(s) r/w name description 0 dmauto sb16 low/high dma auto detect enabled ,when high. 1 spdvalid spdif/in valid bit detect enabled, when high. 2 xgpbio general purpose bi-direction pin, when high output tri-state (default low) 3 reserved 4 reserved 5 xgpo1 general purpose output pin 1,this pin shared with xspdifo pin, and enabled when index reg. f0_bit 0 programmed high. 6:7 reserved * in test mode reg. 27h is used to testing analog adc testing. mpu401 pci port index address 40-4f h fm pci port index address 50-5fh extension index register (access from sb compatible mixer port) index address f0 h bit(s) r/w name description 7:5 vphone[2:0] phone volume control 4 vphom phone mute control 3 vspkm pc-speaker mute control,default high unmute 2 rloopren recording r-channel enable 1 rlooplen recording l-channel enable 0 vadmic3 micphone record boost, default low disable, high enable.
c-media electronics inc. tel:886-2-87731100 fax:886-2-87732211 url : www.cm edia.com.tw products and company names mentioned here are t he trademarks of their respective owners. cmi-8738/pci-6ch series audio chip specification 21 analog testing register address 70-71h bit(s) r/w name description 15:0 anatat[15:0] the settings of analog test mode (reserved) channel 0 frame register 1 address 80 h bit(s) r/w name description 31:0 w basaddr0 base address of channel 0. r curaddr0 current address of channel 0. channel 0 frame register 2 address 84 h bit(s) r/w name description 31:16 w bascnt0 base count of samples at codec. 15:0 w bascnt0 base count of samples at bus master. 31:16 r curcnt0 current count of samples at codec. 15:0 r curcnt0 current count of samples at bus master. channel 1 frame register 1 address 88 h bit(s) r/w name description 31:0 w basaddr1 base address of channel 0. r curaddr1 current address of channel 0. channel 1 frame register 2 address 8c h bit(s) r/w name description 31:16 w bascnt1 base count of samples at codec. 15:0 w bascnt1 base count of samples at bus master. 31:16 r curcnt1 current count of samples at codec. 15:0 r curcnt1 current count of samples at bus master. miscellaneous control register address 92-3h bit(s) r/w name description 15:13 reserved 12 w/r adc48k44k
c-media electronics inc. tel:886-2-87731100 fax:886-2-87732211 url : www.cm edia.com.tw products and company names mentioned here are t he trademarks of their respective owners. cmi-8738/pci-6ch series audio chip specification 22 ?0? (default)adc uses parameters for 44k group. ?1? adc uses parameters for 48k group. 11:5 reserved 4 w/r spd32kfmt ?0? (default)spdif/in uses 44/48k sampling rate. ?1? spdif/in uses 32k sampling rate. 3 w/r adc2spdif ?0? (default)adc output is not connected to spdif/out. ?1? adc output is connected to spdif/out. 2 w/r shareadc ?0? (default)the dac part inside adc block is not shared out. ?1? the dac part inside adc block is shared out. 1 w/r realtcmp ?0? (default)pin xgd6,xgd7 are for game port use. ?1? pin xgd6, xgd7 are used to monitor cmpl/cmpr of the adc. 0 w/r invlrck setting high inverts zvport?s signal lrck. ?0? (default)pin lrck for zvport is not inverted. ?1? pin lrck for zvport is inverted.
c-media electronics inc. tel:886-2-87731100 fax:886-2-87732211 url : www.cm edia.com.tw products and company names mentioned here are t he trademarks of their respective owners. cmi-8738/pci-6ch series audio chip specification 23 legacy sb compatible mixer index d7 d6 d5 d4 d3 d2 d1 d0 0x00 reserved 0x04 wave volume left channel wave volume right channel 0x0a mic volume 0x22 master volume left channel master volume right channel 0x26 fm volume left channel fm volume right channel 0x28 analog-cd volume left channel analog-cd volume right channel 0x2e line-in volume left channel line-in volume right channel 0x30 master volume l. 0x31 master volume r. 0x32 wave volume l. 0x33 wave volume r. 0x34 midi volume l. 0x35 midi volume r. 0x36 cd volume l. 0x37 cd volume r. 0x38 line-in volume l. 0x39 line-in volume r. 0x3a mic. volume 0x3b pc spk volume output muting controls 0x3c line l line r cd l cd r mic recording left channel controls 0x3d fm l fm r line l line r cd l cd r mic recording right channel controls 0x3e fm l fm r line l line r cd l cd r mic 0x3f reserved 0x40 reserved 0x41 reserved 0x42 reserved 0x43 reserved 0x44 reserved 0x45 reserved 0x46 reserved 0x47 reserved please do not write any values into reserved registers 0x30-0x3a registers are sb16 compatible and will be linked with 0x04-0x21 sb pro registers correspondingly. only 0x30- 31 master volume registers are 5 bits and the other are 4 bits.
c-media electronics inc. tel:886-2-87731100 fax:886-2-87732211 url : www.cm edia.com.tw products and company names mentioned here are t he trademarks of their respective owners. cmi-8738/pci-6ch series audio chip specification 24 cmi8738 spdif in/out test report cmi8738 spdif-out 03/04/99 12:19:31 frequency, distortion noise response color line style thick data axis green solid 1 fasttest.ch.1 ampl left yellow solid 1 fasttest.ch.2 ampl left -160 -20 -140 -120 -100 -80 -60 -40 d b f s 20 10k 50 100 200 500 1k 2k 5k hz cmi8738 spdif-in 03/04/99 14:11:15 frequency, distortion noise response color line style thick data axis green solid 1 fasttest.ch.1 ampl left yellow solid 1 fasttest.ch.2 ampl left -160 -20 -140 -120 -100 -80 -60 -40 d b f s 20 10k 50 100 200 500 1k 2k 5k hz spdif test report
c-media electronics inc. tel:886-2-87731100 fax:886-2-87732211 url : www.cm edia.com.tw products and company names mentioned here are t he trademarks of their respective owners. cmi-8738/pci-6ch series audio chip specification 25 cmi8738 spdif-through 03/04/99 12:36:04 frequency, distortion noise response color line style thick data axis green solid 1 fasttest.ch.1 ampl left yellow solid 1 fasttest.ch.2 ampl left -160 -20 -140 -120 -100 -80 -60 -40 d b f s 20 10k 50 100 200 500 1k 2k 5k hz 1. spdif out (playback) > 120db 2. spdif in (recording ) > 120db 3. spdif through mode (bypass) > 120db * this report is generated by audio precision? system ii using multi-tone mode. spdif test report
c-media electronics inc. tel:886-2-87731100 fax:886-2-87732211 url : www.cm edia.com.tw products and company names mentioned here are t he trademarks of their respective owners. cmi-8738/pci-6ch series audio chip specification 26 1. stereo it is only one-dimensional, as sounds come from (left /right) the physical location of speakers. 2. surround (stereo expander ) it filters the existing stereo signal to make the sounds fill in the area around the speakers, and in front of the listener. sound sources appear to come from outside the physical locations of the speakers. 3. multi-speaker surround (dolby pro logic or digital ac-3) it uses five speakers instead of two to surround the listener; hence, sound sources come from five directions and create engaging audio experience. this surround sound effect, however, has to be pre-recorded, and it dose not support interactive environment. audio processing technology
c-media electronics inc. tel:886-2-87731100 fax:886-2-87732211 url : www.cm edia.com.tw products and company names mentioned here are t he trademarks of their respective owners. cmi-8738/pci-6ch series audio chip specification 27 4. hrtf 3d positional 3d (c-media 3d) only this sound processing technology can be called real 3d manifestation, as 3d usually refers to the three dimensions of x, y and z. this technology allows people to pin-point the location of sound in the real world (up/down, left/right, front/back)using only two speakers or a pair of headphones. this technology also supports interactive 3d applications to get a real-time placement of sounds via api (application programming interface) such as microsoft directsound3d tm . we can also use this technology to simulate multi-speaker surround with two physical speakers to deliver five ?virtual" speakers in the air, surrounding the listener and creating home theater sound environment. this is the most economical and the easiest solution to people who would like to get high performance surround sound but don?t want to spend money in adding extra speakers. a virtual speaker a physical speaker audio processing technology
c-media electronics inc. tel:886-2-87731100 fax:886-2-87732211 url : www.cm edia.com.tw products and company names mentioned here are t he trademarks of their respective owners. cmi-8738/pci-6ch series audio chip specification 28 5. hrtf 3d extension positional (c-media 3dx) 3d illusion exists because traditional 3d positional audio system assumes the user's position as the sweet spot to design crosstalk-cancellation circuit; therefore, if the user wants to have 3d positional audio effects, he can?t move his head or position out of sweet spot. another 3d illusion fails because half the population are compulsive "head-turners" who will never get 3d audio from two speakers . to remedy this, c-media utilizes hrtf 3d extension technology (c3dx) to enhance traditional hrtf 3d positional audio by substituting two-speaker system by four-speaker one. therefore, at least one or two speakers should be placed behind the listener's head to complement the rear-side effect, thus creating compelling realistic sound. this technology greatly improves hrtf 3d positional audio quality, and successfully eliminates the sweet spot limitation. users can enjoy the real 3d audio gaming effects, and don't have to worry about the environmental confinement any more. a virtual speaker a physical speaker audio processing technology
c-media electronics inc. tel:886-2-87731100 fax:886-2-87732211 url : www.cm edia.com.tw products and company names mentioned here are t he trademarks of their respective owners. cmi-8738/pci-6ch series audio chip specification 29 c3d hrtf positional audio technology c3d technology uses an audio filter called head related transfer functions (hrtfs), which is licensed from crl?(central research lab). the basic concept of c3d is: since we can hear sound three dimensionally in the real world using our two ears, it must be possible to regenerate the same sound effect from two loud speakers. what is hrtf ? hrtf (head related transfer functions) is a set of audio filters which can vary locations of sound effects (spatial hearing cues) in three-dimension measured from the listener's eardrum. people can use this technology and special digital signal processing to re-create spatial hearing cues, so as to makes the ears hear a realistic and three-dimensional sounds coming from a pairs of loud speakers or headphones. there are several listening cues which allow people to hear sounds three-dimensionally : (i). spatial hearing : primary 3d-cues 1. iad the head shadowing effect creates differences in the amplitudes of the sound signals arriving at each ear from the source. the effects of diffraction are most noticeable in the range between about 700 hz to 8 khz, where the a and s functions periodically converge and diverge gently. this inter-aural amplitude difference (iad) is one of the primary 3d sound cues. hrtf 3d positional audio technology white-paper
c-media electronics inc. tel:886-2-87731100 fax:886-2-87732211 url : www.cm edia.com.tw products and company names mentioned here are t he trademarks of their respective owners. cmi-8738/pci-6ch series audio chip specification 30 2. itd in addition to iad, there is also a time-of-arrival difference between the left and right ears(unless the sound source is in one of the pole positions, such as directly in front, behind, above and below): this is known as the inter-aural time delay (itd). hrtf 3d positional audio technology white-paper
c-media electronics inc. tel:886-2-87731100 fax:886-2-87732211 url : www.cm edia.com.tw products and company names mentioned here are t he trademarks of their respective owners. cmi-8738/pci-6ch series audio chip specification 31 3. pinna effects it has been presumed by several researchers that the convolutions of the pinna create the spectral features which constitute the 'height' cues. in practical experiments by gardner, in which different parts of the pinna were occluded, and then the ability of a number of subjects to identify sound source positions at different heights was tested, it was shown that the different features all contributed by different amounts. for ex ample, if the fossa is excluded, then height localization capability is impaired, but not totally extinguished. it would be reasonable to conclude that it is the combined effect of the pinna convolutions which create the various localization cues, and it is not valid - or logical - to attempt to assign particular spatial capabilities with individual physical features. (ii). spatial hearing : secondary 3d-cues (shoulder & local reflections) in addition to the 'primary' 3d sound cues (iad, itd and pinna effects), there are several additional cues which do contribute to the localization capability; these will be referred to here as 'secondary' cues, and include shoulder/torso reflections, local room reflections, and psychological cues. 1. shoulder / torso reflections the presence of a torso attached to an artificial head has the effect of increasing the pressure in the vicinity of the ear up to frequencies of around 2 khz. the effect is greater for frontal sources than lateral ones. in experience, the presence of the torso does not appear to contribute much to spatial accuracy. however, shoulders are located very close to the ears, and their effect is greater, this time, in respect of hrtf 3d positional audio technology white-paper
c-media electronics inc. tel:886-2-87731100 fax:886-2-87732211 url : www.cm edia.com.tw products and company names mentioned here are t he trademarks of their respective owners. cmi-8738/pci-6ch series audio chip specification 32 lateral sounds. if one listens to an artificial head first without - and then with - shoulder fitments, then it is clear that the shoulders do contribute to spatial effects in certain positions. the shoulders provide a strong reflection from lateral sources, with a short path-length of around 10 cm between direct sound and reflection. the effects are most important for side-positioned sources, especially for "height" effects, where the shoulders tend to mask sources which move below about 30 degree depression. 2. local, room reflections in simulations, it is clear that the incorporation of first-order simulated room reflections can help in the creation of sound images which have a "solid" nature. however, the effects - if accurately simulated - are relatively slight. experience has shown that it is primarily the quality of the hrtfs themselves which determine the quality and solidity of the sound image. the further addition of second-order reflections does not help significantly, because in reality, there is a great number of reflections in the average room. a method which does help to recreate the acoustic experience of a room, however, is to use approximate simulations of lateral reverb, using either 2 or 4 laterally placed "virtual" sources at, say, +-70 degrees and 80 degrees azimuth. ? the quality of the sound image relates to the hrtfs used. ? the quality of the room image relates to addition of reflections and reverb. 3. psychological cues there are clearly psychological cues present in everyday life which work together with the audio cues to tell us about the world around us. for example, if you hear the sound of a helicopter flying, you expect it to be up in the air, and not downwards. if a dog is barking nearby, you would expect it to be downwards. hrtf 3d positional audio technology white-paper
c-media electronics inc. tel:886-2-87731100 fax:886-2-87732211 url : www.cm edia.com.tw products and company names mentioned here are t he trademarks of their respective owners. cmi-8738/pci-6ch series audio chip specification 33 how to listen to c3d sound correctly and properly? 1. use headphones to have much better effect when you use headphones in listening, there will be less interference such as outside voices or room reflections comparing to using speakers. 2. choose correct output devices choose the correct output devices in the options of demo program in accordance with what listening devices you want to listen to. listening through speakers must be proceeded by crosstalk-cancellation, so if you choose the wrong output devices, there won?t be any 3d positional audio effect. hrtf 3d positional audio technology white-paper
c-media electronics inc. tel:886-2-87731100 fax:886-2-87732211 url : www.cm edia.com.tw products and company names mentioned here are t he trademarks of their respective owners. cmi-8738/pci-6ch series audio chip specification 34 3. position of speakers if you listen from speakers, please do not reverse the left and right speakers, which should be put in equal distance from the listener. that is, the listener, the left, and the right speaker must be in the topmost of a right triangle. the position of the listener is called the ?sweet spot?. in addition, the height of the listener?s ears must be equal to that of the speakers. 4. turn surround sound functions off when the surround sound effect is enabled, it will cause confusion with c3d sound, and make positional sound effect invalid. hrtf 3d positional audio technology white-paper
c-media electronics inc. tel:886-2-87731100 fax:886-2-87732211 url : www.cm edia.com.tw products and company names mentioned here are t he trademarks of their respective owners. cmi-8738/pci-6ch series audio chip specification 35 cmi8738 pci audio adapter layout notes 1. the wires of analog circuits (chip pin64-80) must be wider than 12mil . 2. placing digital signals such as spdif in/out(pin86, 98) and txd/rxd(pin88,89) near the analog signal s should be avoided. however, if these signals have to be adjacent, please place ground between these digital and analog signal wires to isolate noises. 3. the whole pcb grounding should be well-organized(the ground must be placed as much as possible. also, the ground of both the component and the solder sides should be drilled as much as possible.). 4. the grounding under cmi8738 shoul d be well-organized as mentioned above. 5. the regulator(78l05) must be placed near the chip as much as possible. 6. the chip and the circuits need independent power supply regulators to prevent insufficient currents.
c-media electronics inc. tel:886-2-87731100 fax:886-2-87732211 url : www.cm edia.com.tw products and company names mentioned here are t he trademarks of their respective owners. cmi-8738/pci-6ch series audio chip specification 36 revision release note: v1.7 12/17/2001 add register listing. v1.8 12/31/2001 modify chip digital power pins level range. v1.8c 02/18/2002 pin description list arrangement. v1.8d 07/09/2003 corrected register 24h bit5 (rear2lin) and register 18h bit5 (reserved).

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