View CMI-8738PCI_1793137.PDF datasheet online --- IC-ON-LINE

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c-m e dia e l e c tronics inc. tel : 886-2-87731100 fax:886-2-87732211 url : www.c m edi a.c o m .tw products and company names mentioned here are t he trademarks of their respective ow ners. cmi-8738/pci audio specification p r e l i m i n a r y v e r 1 . 3 1 ver. 1.3 cmi-8738/pci c3d x pci-based hrtf 3d extension positional audio chip w i th high speed pci v2.1 bus controller and legacy audio sb16? 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 ? sb16?, fm emulator/dls w a vetable music sy nthesis, and hrtf 3d positional audio functions. abov e all cmi8738 supports pctel? hsp56 (1789) interface. being compatible w i th a3d? and directsound? 3d, cmi8738 meets pc98? requirements, 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 ex tension technology to enhance traditional hrtf 3d positional audio by substituting tw o-speaker sy stem by four- speaker one (it supports additional 2ch 16-bit dac to provide rear side audio). it greatly improves hrtf 3d positional audio quality and successfully removes the sw eet spot limitations: users can enjoy genuine 3d audio gaming effects, and don't have to w o rry about the environmental confinement any more. being outstanding for its full au dio functions, competitive price, and pow er management, cmi-8738 is the best choice for people seeking for optimum use of the pc applications. c-media licensed hrtf 3d library from central research lab (crl?), u.k , w ho provides one of the w o rld's best hrtf libraries (crl? also licensed it s audio technology to y a maha?, ess?, and other w e ll-know n sound chip makers). features hrtf-based 3d positional audio , supporting directsound? 3d and a3d? interface supports rear side speakers, c3d x positional audio in 4 ch speaker mode legacy audio sb16 ? compatible dls -based w a v e table music sy nthesizer, 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 driv ers support ac3? 5.1ch interface. mpu-401 port dual game port 16-bit full duplex codec 4 ch 16-bit dac 32-bit pci bus master external e2prom interface single chip design, +5v, 128 pins qfp hsp56 modem interface cmi-8738/pci block diagram mpu 401 and game port dma engine irq control legacy audio sb16?emulator spdif in and out 16-bit codec line out earphone buffer 3d surround mic amp mic in rear l/r line / cd / aux / pcpsk in analog mixer music synthesizer hrtf dsp engine p c i b u s pci interfac e 14. 3 1 8 mhz pll and timing circuit
ver. 1.3 c-m e dia e l e c tronics inc. tel : 886-2-87731100 fax:886-2-87732211 url : www.c m edi a.c o m .tw products and company names mentioned here are t he trademarks of their respective ow ners. cmi-8738/pci audio specification pinout pinout x o u1 c m i 8 73 8b xa f e r s t 10 3 xs c l k 10 4 x h spf s 10 5 x h spsd i 10 6 x h spsd o 10 7 xa f e m c l k 10 8 xb i o 3 10 9 xb i o 2 11 0 xb i o 1 11 1 xb i o 0 11 2 x h n d set 11 3 x m d sel 11 4 vd d 11 5 gn d 11 6 xi n t a 11 7 xi n t b 11 8 xp r s t 11 9 xc l k 3 3 12 0 xg n t 12 1 xr e q 12 2 x a do ut l 64 xv r e f 63 x i n t vr ef 62 avd d 61 agn d 60 x a f epd 59 xm o u t 58 xm i n 57 xo u t 56 xi n 55 vd d 54 gn d 53 xa 0 52 xa 1 51 xa 2 50 xa 3 49 xa 4 48 xa 5 47 gn d 46 vd d 45 x a 2 7 2 gn d 3 vd d 4 xa 2 6 5 xa 2 5 6 xa 2 4 7 x c be3 8 x i d sel 9 vd d 10 gn d 11 xa 2 3 12 xa 2 2 13 xa 2 1 14 xa 2 0 15 xa 1 9 16 gn d 17 vd d 18 xa 1 8 19 a17 20 xa 1 6 21 x c be2 22 x f r a m e 23 xi r d y 24 xt r d y 25 x d evsel 26 vd d 27 gn d 28 x s t o p 29 x par 30 x c be1 31 x r i n g 10 1 vd d m 10 0 dg nd 99 x spd i f o 98 xg d 7 97 xg d 6 96 xg d 5 95 xg d 4 94 xg d 3 93 xg d 2 92 xg d 1 91 xg d 0 90 xr xd 89 xt xd 88 x g pbi o 87 x spd i f i 86 x m bc sz 85 x eec s 84 vd d 5 v 83 agn d 82 avd d 81 x m ic i n 80 x p c s p k i n 79 xa u x r 78 xa u x l 77 xl n r 76 xl n l 75 x r ear r 74 x r ear l 73 xc d r 72 xa 1 5 32 xa 1 4 33 xa 1 3 34 xa 1 2 35 gn d 36 vd d 37 xa 1 1 38 xa 1 0 39 xa 9 40 xa 8 41 x c be0 42 xa 7 43 xa 6 44 xa 2 9 12 8 xa 3 0 12 7 xa 3 1 12 6 gn d 12 5 vd d 12 4 xp m e 12 3 x a 2 8 1 x a do ut r 65 x a dc h l 66 x a dc h r 67 xl f i l t 68 xr f i l t 69 x c dg n d 70 xc d l 71 f f h o o k 10 2 cmi8738/pci c3dx audio chip qfp 128 pins 2
c-m e dia e l e c tronics inc. tel : 886-2-87731100 fax:886-2-87732211 url : www.c m edi a.c o m .tw products and company names mentioned here are t he trademarks of their respective ow ners. cmi-8738/pci audio specification pin description 3 ver. 1.3 digital pin description nam e n u m b e r pin ty pe definition x a 3 1 - x a 0 1 2 6 - 1 2 8 , 1 - 2 , 5 - 7 , 1 2 - 1 6 , 1 9 - 2 1 , 3 2 -35,38-41,43-44,47-52 i/o pci bus address and data lines xinta 117 o interrupt request , activ e-low . xintb 118 o modem interrupt request,activ e-low x p r s t 1 1 9 i r e s e t xclk33 120 i pci bus clock. xgnt 121 i bus master grant, activ e-low . xreq 122 o bus master request, tri-state output, activ e-low . xidsel 9 i id select, activ e-high. x f r a m e 2 3 i / o c y cle frame, activ e-low . xirdy 24 i/o initiator ready , activ e-low . the bus master dev i ce is ready to transmit or receiv e data xtrdy 25 i/o target ready , activ e-low . the target dev i ce is ready to transmit or receiv e data xdevsel 26 i/o dev i ce select, activ e-low . the target dev i ce has decoded the address of the current transaction as its ow n chip select range. xstop 29 i/o stop transaction, activ e-low . the target dev i ce request to the master to stop the current transaction. xpar 30 i/o parity . the pin indicates ev en parity across xa31-xa9 and xcbe3-0 for both address and data phases. xcbe3,2,1,0 8,22,31,42 i/o multiplexed command/by te enable. these pins indicate cy cle ty pe during the address phase of a transaction. v d d 4 , 1 0 , 1 8 , 2 7 , 3 7 , 4 5 , 5 4 , 1 1 5 , 124 +5v digital and pci i/o pow er pin g n d 3 , 1 1 , 1 7 , 2 8 , 3 6 , 4 6 , 5 3 , 116,125 gnd digital and pci i/o ground xin 55 i 14.318mhz cry s tal, or external clock input x o u t 5 6 o 14.318mhz cry s t a l xgd7-xgd4 97-94 i game port sw itch input pin. sw itch d to sw itch 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 receiv e data xspdifo 98 o 44.1khz spdif output xspdifi 86 i* 44.1khz spdif input xsclk 104 o modem daa serial clock xbio3-xbio 0 109-112 i/o general purpose i/o vdd5v 83 +5v digital and pci i/o pow er pin vddm 100 +5v digital and pci i/o pow er pin dgnd 99 gnd digital and pci i/o ground xeecs 84 o eeprom chip select
ver. 1.3 c-m e dia e l e c tronics inc. tel : 886-2-87731100 fax:886-2-87732211 url : www.c m edi a.c o m .tw products and company names mentioned here are t he trademarks of their respective ow ners. cmi-8738/pci audio specification pin description analog pin description a v d d 6 1 , 8 1 + 5 v analog pow e r a g n d 6 0 , 8 2 g n d analog g r o u n d x a d o u t l - r 6 4 , 6 5 ao1 line out x a d c h l - r 6 6 , 6 7 a i / o adc f i l t e r xlfilt 68 ai/o left channel dac filter xrfilt 69 ai/o right channel dac filter x i n t v r e f 6 2 a i reference v o l t a g e xvref 63 ai reference voltage (no use, left it floating) xcdl-r xcdgnd 71,72,70 ai cd audio differential input xlnl-r 75,76 ai line in or rear speaker out xauxl-r 77,78 ai aux. line in xpcspkin 79 ai pc beep signal x m i c i n 8 0 a i m i c r o p h o n e i n xrearl-r 73,74 ai/o rear speaker out xmdsel 114 i modes chip select (high:enable) xgpbio 87 o general purpose i/o pin (0=disabled, 1=enabled) x r i n g 1 0 1 i r i n g d e t e c t i o n i n p u t xoffhook 102 o off-hook control output xaferst 103 o reset signal for modem daa xhspfs 105 o modem daa frame sync xhspsdi 106 i modem daa data input xhspsdo 107 o modem daa data output xafemclk 108 o modem daa master clock x h n d s e t 1 1 3 o reserv e d x a f e p d 5 9 o reserv e d xmout 58 o modem cry s tal output (18.432mhz) xmin 57 i modem cry s tal input xmbcsz 85 i audio chip select (low :enable) 4
ver. 1.3 c-m e dia e l e c tronics inc. tel : 886-2-87731100 fax:886-2-87732211 url : www.c m edi a.c o m .tw products and company names mentioned here are t he trademarks of their respective ow ners. cmi-8738/pci audio specification power on configuration pin nam e n u m b e r d e f i n i t i o n xtxd 88 when pull-dow n select add-on mode, default pull-high motherboard. xafepd 59 when pull-dow n enable #intb share w i th #inta, default high disabled. xhndset 113 when pull-dow n enable external 18.432mhz x'tal to hsp module, default pull-high enable internal 24.576mhz to hsp module. xbio0 112 when pull-dow n select clkgen ref. clock to external 24.576mhz x'tal. default pull-high select 14.318mhz 5
ver. 1.3 c-m e dia e l e c tronics inc. tel : 886-2-87731100 fax:886-2-87732211 url : www.c m edi a.c o m .tw products and company names mentioned here are t he trademarks of their respective ow ners. cmi-8738/pci audio specification electrical characteristics absolute maximum ratings r a t i n g s s y m b o l v a l u e u n i t s digital pow er v o ltage vdd vdd digital characteristics p a r a m e t e r s y m b o l m i n ty p m a x u n i t input high v o ltage(pci i/o) vih 2. vdd+0.5 v input low v o ltage (pci i/o) vil -0.5 0.8 v output high v o ltage voh 2.4 vdd v output low v o ltage vol 0.0 0.2 0.4 v spdif in input high v o ltage vih1 2.6 v spdif in input low v o ltage vil1 2.4 v spdif output high v o ltage voh1 vdd v spdif output low v o ltage vol1 vss v output buffer current 5 ma audio characteristics p a r a m e t e r s y m b o l m i n ty p m a x u n i t analog input v o ltage av in 1.1 vrms analog output v o ltage av out 1.1 vrms a-a s/n ratio 85 db a - a t h d 0 . 0 9 adc s/n ratio 80 db a d c t h d 0 . 1 0 . 2 % dac s/n ratio 80 db d a c t h d 0 . 1 0 . 2 % spdif in/out s/n ratio 120 db spdif in/out thd 0 % microphone input lev e l 20 200 mv m i c r o p h o n e b o o s t e r 2 0 d b 6
cmi-8738/pci audio specification configuration space 7 ver. 1.3 cmi8738 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 c-m e dia e l e c tronics inc. tel : 886-2-87731100 fax:886-2-87732211 url : www.c m edi a.c o m .tw products and company names mentioned here are t he trademarks of their respective ow ners.
cmi-8738/pci audio specification configuration 8 ver. 1.3 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 : ( subsy s tem vender id ) (r/w) 2e h ffff : subsy s tem 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 cmi8738 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) 1 (bit 1) memory space (r/w) 0 (bit 0) i/o space (read only) 06h status b0 (bit 15) detected parity error b0 (bit 14) signaled system error c-m e dia e l e c tronics inc. tel : 886-2-87731100 fax:886-2-87732211 url : www.c m edi a.c o m .tw products and company names mentioned here are t he trademarks of their respective ow ners.
ver. 1.3 c-m e dia e l e c tronics inc. tel : 886-2-87731100 fax:886-2-87732211 url : www.c m edi a.c o m .tw products and company names mentioned here are t he trademarks of their respective ow ners. cmi-8738/pci audio specification b0 (bit 13) received master abort b0 (bit 12) received target abort b0 (bit 11) signaled target abort b01 (bits 10-9) devsel timing 00-fast, 01-medium, 10-slow b0 (bit 8) data parity error detected b0 (bit 7) fast back-to-back capable b0 (bit 6) udf supported b0 (bit 5) 0-33mhz, 1-66mhz capable b00000 (bits 4-0) reserved 08h x 10: revision id 09h x 078000: communication device (modem) 0ch x 00: cache line size 0dh x 00: latency timer oeh x 80: header type (multifunction device) ofh x 00: bist 10h x bbbbb000: allocate 4k memory space. 14h x 00000000: not used - second base address register 18h x 00000000: not used - third base address register 1ch x 00000000: not used- four base address register 20h x 00000000: not used- fifth base address register 24h x 00000000: not used- sixth base address register 28h x 00000000: card bus cis pointer 2ch x 13f6: sub-system vender id (value can be replaced after reset.) (r/w) 2eh x 0211: 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 x 00000000: expansion rom base address 34h x 00000040: pointer to the power-saving registers. (read only) 38h x 00000000: reserved 3ch x 00: interrupt line (r/w) 3dh interrupt pin(x 01 share interrupt/x 02 not share interrupt with audio) *select from the power on pin configuration 3eh x 00: min grant(not used) 3fh x 00: max latency(not used) 40h x e c4a0001(read only) 9
ver. 1.3 c-m e dia e l e c tronics inc. tel : 886-2-87731100 fax:886-2-87732211 url : www.c m edi a.c o m .tw products and company names mentioned here are t he trademarks of their respective ow ners. cmi-8738/pci audio specification 44h-47h b0-b1: pmst (r/w) (11) 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)
cmi-8738/pci audio specification pci register ver. 1.3 internal register mapping function control register 0 address 00 h bit(s) r/w name description 31-20 r e served. 19 r s t_c h 1 c h annel 1 , 1->r eset (defaul t 0) 18 r s t_c h 0 c h annel 0 , 1->r eset (defaul t 0) 17 c h en1 c h annel 1 , 1->enabl ed, 0->di s abl e d. 16 c h en0 c h annel 0 , 1->enabl ed, 0->di s abl e d. 15-4 r e served 3 p ause1 c h annel 1 , 1->pause i f channel 1 i s enabl e d. 2 p ause0 c h annel 0 , 1->pause i f channel 0 i s enabl e d. 1 chadc1 channel 1 , 1->recording, 0->play b ack 0 chadc0 channel 0, 1->recording, 0->play b ack function control register 1 address 04 h bit(s) r/w name description 31-16 r e served 15-13 dsfc [2: 0 ] dac sam p l i ng frequency sel ect , 0 0 0 5.512 k 0 0 1 1 1 .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 ] adc sam p l i ng frequency sel ect , 0 0 0 5.512 k 0 0 1 1 1 .025 k 0 1 0 22.05 k 0 1 1 44.1 k 1 0 0 8 k c-m e dia e l e c tronics inc. tel : 886-2-87731100 fax:886-2-87732211 url : www.c m edi a.c o m .tw products and company names mentioned here are t he trademarks of their respective ow ners.
ver. 1.3 c-m e dia e l e c tronics inc. tel : 886-2-87731100 fax:886-2-87732211 url : www.c m edi a.c o m .tw products and company names mentioned here are t he trademarks of their respective ow ners. cmi-8738/pci audio specification 1 0 1 16 k 1 1 0 32 k 1 1 1 48 k 9 spdf_1 spdif in/ out at c h annel b at 44.1k doubl e-words/ sec. 8 spdf_0 spdif out onl y at c h annel a at 44.1k doubl e-words/ sec. 7 spdfloop ext e rnal spdif/ i n l oopback t o ext e rnal spdif/ out . 6 spdo2dac spdif/out can be heard from i n t e rnal dac . 5 intr m int e rrupt m a sk bi t for m c b (m ast e r cont rol bl ock) m odul e in terru p t . 0 m c b i n t e rrupt di sabl ed. 1 m c b i n t e rrupt enabl e d. 4 breq if th is b it is set lo w it will p r ev en t th e mcb an d dac/adc block from accessing the m e m o ry . 0 b u s m a st er request di sabl ed(power on st at e) 1 b u s m a st er request enabl e d. 3 voice_en this bit enables legacy v o ice device(sb16,fm). 0 legacy v o i ce di sabl ed on channel 0. 1 legacy v o ice enabled on channel 0. 2 uar t_en this bit enables legacy uar t device. 0 uar t di sabl ed 1 uar t enabled 1 jystk_ en th is b it en ab les leg acy jo ystick d e v i ce. 0 joy s t i c k di sabl ed 1 joy s t i c k enabl e d 0 r e s e r v e d channel format register address 08 h bit(s) r/w name description 31-24 ver [ 7: 0] pc i audi o subversi on for i n t e rnal i ndent i f i cat i on. ?01? 23-22 sw tc lk[1: 0 ] in real m ode, swi t c h c l oc k generat o r out put t o xspdif/out. 0 x m a in tain o r ig in al sp d i f/o u t b it stream to xspdif/o u t . 10 16.9344m hz t o i/ o xspdifo 1 1 24.576m hz t o i/ o xspdifo 21 r e served 2 0 ac3 e n w h en set 1 , it will g e n e rate ac3 en ab le b it o n sp d i f/o u t fr am a #1 bi t 30 ( channel st at us bi t )
ver. 1.3 c-m e dia e l e c tronics inc. tel : 886-2-87731100 fax:886-2-87732211 url : www.c m edi a.c o m .tw products and company names mentioned here are t he trademarks of their respective ow ners. cmi-8738/pci audio specification 19 selspdifi2 w h en set 1,intern al spdif/in will switch to secondary spdif/in i/o(xhndset) 1 8 fmoffset2 w h en set 1 an d reg . 2 4 h b it7 ?fmm u t e=1 ? ,fm pcm will b e forced t o dc val u e 0002h. 17 spd24sel w h en set 1 and spd32sel=1,spdif/ out t r ansm i t 24bi t pc m dat a ,pc m dat a i n sy st em form at onl y val i d i n 24 l east si gni fi cant b i t s d[23: 0] ,bi t s d[31: 24] don? t care. 16 invspdifi inverse spdi f/ i n dat a ,funct i on for com p at i b l e t o di f f erent cd-rom . 1 5 - 1 4 ad cbitlen [1 :0 ] sam p le reso lu tio n 0 0 1 6 bits p e r sam p le . (defau lt) 01 15 b i t s per sam p l e . 10 14 b i t s per sam p l e . 11 13 b i t s per sam p l e . 13-12 adcdaclen[1: 0 ] sam p l e resol u t i on 00 600nsec per bi t i n a sam p l e . 01 660nsec per bi t i n a sam p l e . 10 1.3usec per bi t i n a sam p l e . (defaul t ) 11 2.8usec per bi t i n a sam p l e . 1 1 c h 1 ssm p l e r a t e 176k 10 c h 1 sam p l e r a t e 88k 9 c h 0 sam p l e r a t e 176k 8 c h 0 sam p l e r a t e 88k 7-4 reserved 3-2 c h 1fm t [1: 0 ] dat a form at of channel 1 00 8 bi t m ono m ode 01 8 bi t st ereo m ode 10 16 bi t m ono m ode 1 1 16 bi t st ereo m ode 1-0 c h 0fm t [1: 0 ] dat a form at of channel 0 00 8 bi t m ono m ode 01 8 bi t st ereo m ode 10 16bi t m ono m ode 1 1 16 bi t st ereo m ode interrupt hold/clear register address 0c h bit(s) r/w name description
ver. 1.3 c-m e dia e l e c tronics inc. tel : 886-2-87731100 fax:886-2-87732211 url : www.c m edi a.c o m .tw products and company names mentioned here are t he trademarks of their respective ow ners. cmi-8738/pci audio specification 31-19 r e served 18 tdma_int_en interrupt hold/ clear bits for updating tdma position 0 int e rruupt c l ear 1 in terru p t ho ld if ex ist. 17 c h 1_int_en int e rrupt hol d/ cl ear bi t s for t h e c h annel 1. 0 interrupt clear 1 in terru p t ho ld if ex ist. 16 c h 0_int_en int e rrupt hol d/ cl ear bi t s for t h e c h annel 0. 0 int e rrupt c l ear 1 in terru p t ho ld if ex ist. 15-0 r e served interrupt register address 10 h bit(s) r/w name description 31 r intr interrupt reflected from any sources. 0 no in terru p t 1 int e rrupt pendi ng 30-28 r e served 27 r vco 26 r m c b i nt abort condi t i ons occur duri ng pc i b u s t a r g et / m ast e r access. 0 no i n t e rrupt 0 int e rrupt pendi ng 25-17 r e served 1 6 r uar t i n t th is b it is th e uar t in terru p t b it. 0 no uar t interrupt 1 uar t i n t e rrupt pendi ng 15 r l t dmaint interrupt for updating low channel tdma position. 0 no in terru p t 1 int e rrupt pendi ng 14 r htdmaint interrupt for updation high channel tdma position. 0 no in terru p t . 1 int e rrupt pendi ng. 13-8 r e served 7 r xdo46 direct program m i ng eeprom interface , read data register 6 r lhbt og high/low stat us from dm a ctrl register . 5 r leghdm a legacy is in high dm a channel.
ver. 1.3 c-m e dia e l e c tronics inc. tel : 886-2-87731100 fax:886-2-87732211 url : www.c m edi a.c o m .tw products and company names mentioned here are t he trademarks of their respective ow ners. cmi-8738/pci audio specification 4 r legst e reo legacy i s i n st ereo m ode. 3 r c h1b usy c h annel b b u sy . 2 r c h0b usy c h annel a b u sy . 1 r ch in t1 ch an n e l b in terru p t . 0 no in terru p t 1 int e rrupt pendi ng 0 r ch in t0 ch an n e l a in terru p t . 0 no i n t e rrupt 1 int e rrupt pendi ng legacy contr o l/status register address 14 h bit(s) r/w name description 31 r e served 30-29 vmpu [1:0] base address for mpu401 access 00 b a se address : 330h 01 b a se address : 320h 10 b a se address : 310h 1 1 b a se address : 300h 28 r e served 27-26 vsbsel[1:0] the base address select for sb16 access. 00 b a se address: 220h 01 b a se address: 240h 10 b a se address: 260h 11 b a se address: 280h 25-24 fmsel[1:0] the base address select for fm access. 00 b a se address : 388h 01 b a se address : 3c 8h 10 b a se address : 3e0h 11 b a se address : 3e8h 23 enspdout enable xspdif/out to i/o interface 22 spdc o pyr h t spdif in/ out c opy r i ght st at us bi t 21 dac2spdo enable w a ve+fm+midi to spdif/out interface 2 0 setretry mo d e o f wait state . 0 :leg acy i/o wait (d efau lt) 1 :leg acy i/o bus retry 19 c_eeaccess direct program m i ng eeprom interface registers. 18 c_eecs 17 c _ eedi46
ver. 1.3 c-m e dia e l e c tronics inc. tel : 886-2-87731100 fax:886-2-87732211 url : www.c m edi a.c o m .tw products and company names mentioned here are t he trademarks of their respective ow ners. cmi-8738/pci audio specification 16 c_eeck46 15-0 r e served micellaneous contr o l register a d d r e s s 1 8 h bit(s) r/w nam e descrip tio n 31 pw d power down m ode enabled.. 30 r e set r e set b u s m a st er/ d sp engi ne. 2 9 - 2 8 sfil[1 : 0 ] fo u r lev e l o f filter co n t ro l at th e fro n t en d dac.. 2 7 tx/vx w h ich m o th erb o a rd to wo rk with 0 vx ch ip sets. 1 tx ch ip sets. 26 n4spk3d hardware copy front channel t o rear channel 25 spdo5v spdif-out l e vel set t i ng 24 w / spdif48k ; r / sp a t us48k ; 23 endbdac default low , high will enable double dac structure. 22 xchgdac default low , 0 c h 0 > front spkr , c h 1 > b ack spkr . 1 c h 0 > b ack spkr , c h 1 > front spkr . 21 spd32sel when hi gh, support 32bi t s spdif form at ,l ow 16bi t s 20 spdfloopi i n t e rnal spdif/ out l oopback t o i n t e rnal spdif/ i n, for l oopback t e st i ng 19 fm _en legacy fm enabl e d. 18 r e served 17 r e served 16 vidw pdsb sub id wri t e prot ect di sabl ed. (defaul t 0) 15 spdf_ac 97 0: spdif/ out 44.1k 1: spdif/ out 48k(share wi t h ac 97 t r ansfer) 14 m a sk_en act i v at e channel m a sk on legacy dm a. 0 d i sab l ed 1 en ab led 13 vidw pdsb w r i t e prot ect of hsp c onfi gurat i on sub id. 0 protect. 1 no prot ect . 1 2 sfilenb let so ftware co n t rl filter step p i n g at th e fro n t en d dac. 1 1 -9 mm ode[2:0] modem daa interface m ode selection,default 000 000 modem in local daa interface m ode 001 m odem i n ac 97_link m ode
ver. 1.3 c-m e dia e l e c tronics inc. tel : 886-2-87731100 fax:886-2-87732211 url : www.c m edi a.c o m .tw products and company names mentioned here are t he trademarks of their respective ow ners. cmi-8738/pci audio specification 010 m odem i n paral l e l c m _link m ode (ext ernal m odem bri dge support e d) 1xx m odem i n seri al c m _link m ode (ext ernal m odem bri dge support e d) 8 r e s e r v e d 7 flinkon force link detection on when in cm _link m ode,default 0 6 flinkoff force li nk det ect i on of f when i n c m _link m ode,defaul t 0 5 r e s e r v e d 4 m i dsm p enabl e 1/ 2 i n t e rpol at i on at t h e front end dac .. 3-2 upddm a[1: 0] for every t h e num ber of sam p l e s t o not i f y updat i ng tdm a posi t i on. 00 every 2048 sam p l e s 01 every 1024 sam p l e s 10 every 512 sam p l e s. 11 every 256 sam p l e s. 1-0 tw ait[1: 0] for cont rol i ng t h e l e ngt h of l e gacy b u s cy cl e. 00 3 pc ic lk. 01 18 pc ic lk. 10 24 pc ic lk 11 32 pc ic lk * not i ce r e q_sq[2: 0 ] st at es of b u sr equest engi ne. mm_da t a bus master is using bus. m i dle b u s m a st er i s not usi ng b u s. reqa/reqb ch an n e l 0 / 1 bu smaster req u e st. gnt a/gntb channel 0/1 busm aster grant. adr q/ b d r q c h annel 0/ 1 dm a r e quest . adack/ bdack channe l 0/ 1 dm a acknol edge. air q / b ir q c h annel 0/ 1 int e rrupt . c x / b x c h annel 0/ 1 b u sy . t - dma position address 1ch bit(s) r/w nam e description 31-16 r tdm a c n t c u rrent b y t e / w ord c ount of dm a channel . 15-0 r tdm aadr current address of dm a channel. mixer contr o l / device configur e register (can be accessed only by byte
ver. 1.3 c-m e dia e l e c tronics inc. tel : 886-2-87731100 fax:886-2-87732211 url : www.c m edi a.c o m .tw products and company names mentioned here are t he trademarks of their respective ow ners. cmi-8738/pci audio specification instruction) address 20 h bit(s) r/w nam e description 7-0 w sb vr [7: 0 ] program m a bl e sb 16 versi on no. r dev[7: 0] hardwi re devi ce versi on no. address 21 h bit(s) r/w nam e description 7-3 r e served 2 x_adpcm sb16 adpcm enable,default disabled. 1 pr oinv sb pro left / r i ght channel swi t c hi ng. 0 x_sb 16 indi cat e devi ce act i v e as sb 16 com p at i b l e , defaul t sb 16 address 22 h bit(s) r/w nam e description 7-0 idxdat a m a ppi ng sb com p at i b l e m i xer index regi st er dat a port ( a2x5h) address 23 h bit(s) r/w nam e description 7-0 idxaddr m a ppi ng sb com p at i b l e m i xer index regi st er address port ( a2x4h) address 24 h bit(s) r/w nam e description 7 fmmute mute fm 6 ws mute mute wave s t ream 5 spk4 select four speaker mode(emulate line in to line out ) 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 nam e description 7 rauxren recording source select r-aux 6 rauxlen recording source select l_aux
ver. 1.3 c-m e dia e l e c tronics inc. tel : 886-2-87731100 fax:886-2-87732211 url : www.c m edi a.c o m .tw products and company names mentioned here are t he trademarks of their respective ow ners. cmi-8738/pci audio specification 5 vauxrm r-aux mute c ontrol 4 vauxlm l-aux mute c ontrol 3-1 vadmic[2:0] recording mic volume control 0 micgainz mic gain control,default high disable address 26 h bit(s) r/w nam e description 7-4 vauxl[3:0] l-aux volume c ontrol 3-0 vauxr[3:0] r-aux volume c ontrol address 27 h bit(s) r/w nam e 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 mup401 pci port index address 40-4f h fm pci port index address 50-5fh extension index register ( access fr om sb compatible mixer port ) index address f0 h bit(s) r/w nam e description 7-5 vphone[2: 0 ] phone vol um e cont rol 4 vphom phone m u t e cont rol 3 vspkm pc -speaker m u t e cont rol , defaul t hi gh unm ut e 2 rloopren recording r-channel enable 1 rlooplen recording l-channel enable 0 vadm ic3 m i cphone record boost , defaul t l o w di sabl e, hi gh enabl e .
ver. 1.3 c-m e dia e l e c tronics inc. tel : 886-2-87731100 fax:886-2-87732211 url : www.c m edi a.c o m .tw products and company names mentioned here are t he trademarks of their respective ow ners. cmi-8738/pci audio specification index address f8-ff h these 8 registers is used to progra mming m/n conunter by clock generator channel 0 frame register 1 address 80 h bit(s) r/w nam e 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 nam e description 31-16 w b a sc nt0 b a se count of sam p l e s at c odec. 15-0 w b a sc nt0 b a se count of sam p l e s at b u s m a st er . 31-16 r c u r c n t0 c u rrent count of sam p l e s at c odec. 15-0 r c u r c n t0 c u rrent count of sam p l e s at b u s m a st er . channel 1 frame register 1 address 88 h bit(s) r/w nam e 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 nam e description 31-16 w b a sc nt1 b a se count of sam p l e s at c odec. 15-0 w b a sc nt1 b a se count of sam p l e s at b u s m a st er . 31-16 r c u r c n t1 c u rrent count of sam p l e s at c odec. 15-0 r c u r c n t1 c u rrent count of sam p l e s at b u s m a st er .
ver. 1.3 c-m e dia e l e c tronics inc. tel : 886-2-87731100 fax:886-2-87732211 url : www.c m edi a.c o m .tw products and company names mentioned here are t he trademarks of their respective ow ners. cmi-8738/pci audio specification legacy sb compatible mixer i n d e x d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0 0 x 0 0 r e s e r v e d 0x04 wave volume left channel wave volume right channel 0 x 0 a m i c v o l u m e 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 0 x 3 0 r e s e r v e d 0 x 3 1 r e s e r v e d 0 x 3 2 r e s e r v e d 0 x 3 3 r e s e r v e d 0 x 3 4 r e s e r v e d 0 x 3 5 r e s e r v e d 0 x 3 6 r e s e r v e d 0 x 3 7 r e s e r v e d 0 x 3 8 r e s e r v e d 0 x 3 9 r e s e r v e d 0 x 3 a r e s e r v e d 0 x 3 b pc spk v o l u m e output muting controls 0 x 3 c line l line r cd l cd r mic recording left channel controls 0 x 3 d fm l fm r line l line r cd l cd r mic recording right channel controls 0 x 3 e fm l fm r line l line r cd l cd r mic 0 x 3 f r e s e r v e d 0 x 4 0 r e s e r v e d 0 x 4 1 r e s e r v e d 0 x 4 2 r e s e r v e d 0 x 4 3 r e s e r v e d 0 x 4 4 r e s e r v e d 0 x 4 5 r e s e r v e d 0 x 4 6 r e s e r v e d 0 x 4 7 r e s e r v e d irq channel (read only) 0 x 8 0 i r q 1 0 i r q 7 i r q 5 i r q 2 ( 9 ) 16 bit dma channel (read only) 8 bit dma channel (read only) 0x81 dma 7 dma 5 dma 3 dma 1 dma 0 interrupt status (read only) 0 x 8 2 mpu-40 1 16bit dma 8bit dma z please do not write any values into reserved registers 3
c-m e dia e l e c tronics inc. tel : 886-2-87731100 fax:886-2-87732211 url : www.c m edi a.c o m .tw products and company names mentioned here are t he trademarks of their respective ow ners. cmi-8738/pci audio specification spdif test report ver. 1.3 cmi8738 spdif in/out t e st report c m i 8738 s p d i f- ou t 03/ 04/ 9 9 12: 19: 31 f r equ en cy , d i st or t i on n o i s e r e spon s e c o l o r l i ne s t y l e t hi c k d a t a a x i s g r e e n s ol i d 1 f as t t es t . c h . 1 a m pl lef t y e l l o w s ol i d 1 f as t t es t . c h . 2 a m pl lef t -1 6 0 -2 0 -1 4 0 -1 2 0 -1 0 0 -8 0 -6 0 -4 0 d b f s 20 10k 50 100 200 500 1k 2k 5k hz c m i 8738 s p d i f- i n 03/ 04/ 9 9 14: 11: 15 f r equ en cy , d i st or t i on n o i s e r e spon s e c o l o r l i ne s t y l e t hi c k d a t a a x i s g r e e n s ol i d 1 f as t t es t . c h . 1 a m pl lef t y e l l o w s ol i d 1 f as t t es t . c h . 2 a m pl lef t -1 6 0 -2 0 -1 4 0 -1 2 0 -1 0 0 -8 0 -6 0 -4 0 d b f s 20 10k 50 100 200 500 1k 2k 5k hz
c-m e dia e l e c tronics inc. tel : 886-2-87731100 fax:886-2-87732211 url : www.c m edi a.c o m .tw products and company names mentioned here are t he trademarks of their respective ow ners. cmi-8738/pci audio specification spdif test report ver. 1.3 c m i 8738 s p d i f- t h r o u g h 03/ 04/ 9 9 12: 36: 04 f r equ en cy , d i st or t i on n o i s e r e spon s e c o l o r l i ne s t y l e t hi c k d a t a a x i s g r e e n s ol i d 1 f as t t es t . c h . 1 a m pl lef t y e l l o w s ol i d 1 f as t t es t . c h . 2 a m pl lef t -1 6 0 -2 0 -1 4 0 -1 2 0 -1 0 0 -8 0 -6 0 -4 0 d b f s 20 10k 50 100 200 500 1k 2k 5k hz 1. spdif out (play b ack) > 120db 2. spdif in (recording ) > 120db 3. spdif through mode (by p ass) > 120db * this report is generated by audio precision? system ii using multi-tone mode.
c-m e dia e l e c tronics inc. tel : 886-2-87731100 fax:886-2-87732211 url : www.c m edi a.c o m .tw products and company names mentioned here are t he trademarks of their respective ow ners. cmi-8738/pci audio specification audio processing technology ver. 1.3 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 ef fect, however , has to be pre-recorded, and it dose not support interactive environment.
ver. 1.3 c-m e dia e l e c tronics inc. tel : 886-2-87731100 fax:886-2-87732211 url : www.c m edi a.c o m .tw products and company names mentioned here are t he trademarks of their respective ow ners. cmi-8738/pci audio specification audio processing technology 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 physical speaker a virtual speaker
c-m e dia e l e c tronics inc. tel : 886-2-87731100 fax:886-2-87732211 url : www.c m edi a.c o m .tw products and company names mentioned here are t he trademarks of their respective ow ners. cmi-8738/pci audio specification audio processing technology ver. 1.3 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 nev er 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 ph ysic al speaker a virtual speaker
c-m e dia e l e c tronics inc. tel : 886-2-87731100 fax:886-2-87732211 url : www.c m edi a.c o m .tw products and company names mentioned here are t he trademarks of their respective ow ners. cmi-8738/pci audio specification hrtf 3d positional audio technology white-paper ver. 1.3 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.
ver. 1.3 c-m e dia e l e c tronics inc. tel : 886-2-87731100 fax:886-2-87732211 url : www.c m edi a.c o m .tw products and company names mentioned here are t he trademarks of their respective ow ners. cmi-8738/pci audio specification 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).
c-m e dia e l e c tronics inc. tel : 886-2-87731100 fax:886-2-87732211 url : www.c m edi a.c o m .tw products and company names mentioned here are t he trademarks of their respective ow ners. cmi-8738/pci audio specification hrtf 3d positional audio technology white-paper ver. 1.3 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
c-m e dia e l e c tronics inc. tel : 886-2-87731100 fax:886-2-87732211 url : www.c m edi a.c o m .tw products and company names mentioned here are t he trademarks of their respective ow ners. cmi-8738/pci audio specification hrtf 3d positional audio technology white-paper ver. 1.3 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.
c-m e dia e l e c tronics inc. tel : 886-2-87731100 fax:886-2-87732211 url : www.c m edi a.c o m .tw products and company names mentioned here are t he trademarks of their respective ow ners. cmi-8738/pci audio specification hrtf 3d positional audio technology white-paper ver. 1.3 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.
c-m e dia e l e c tronics inc. tel : 886-2-87731100 fax:886-2-87732211 url : www.c m edi a.c o m .tw products and company names mentioned here are t he trademarks of their respective ow ners. cmi-8738/pci audio specification hrtf 3d positional audio technology white-paper ver. 1.3 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.
c-m e dia e l e c tronics inc. tel : 886-2-87731100 fax:886-2-87732211 url : www.c m edi a.c o m .tw products and company names mentioned here are t he trademarks of their respective ow ners. cmi-8738/pci audio specification audio rack panel ver. 1.3 audio rack panel line-in becomes rear speakers output 4 speakers system enable four speakers system : two speakers system :
ver. 1.3 c-m e dia e l e c tronics inc. tel : 886-2-87731100 fax:886-2-87732211 url : www.c m edi a.c o m .tw products and company names mentioned here are t he trademarks of their respective ow ners. cmi-8738/pci audio specification cmi8738 pci audio adapter layout notes 1. the wires of analog circuits(chi p 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 adjacen t, 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 should 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.
ver. 1.3 c-m e dia e l e c tronics inc. tel : 886-2-87731100 fax:886-2-87732211 url : www.c m edi a.c o m .tw products and company names mentioned here are t he trademarks of their respective ow ners. cmi-8738/pci audio specification revision release note: v1.1 12/17/2001 1. add register listing. v1.2 01/17/2003 2. add pin62 xintref description.

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