CMI-8738

Ver. 1.2 CMI-8738/PCI-SX AUDIO Specification Preliminary Ver 1.2 CMI-8738/PCI-SX C3DX PCI-Based HRTF 3D Extension Positional Audio Chip With high speed PCI V2.1 bus controller and legacy audio Features HRTF-based 3D positional audio, supporting DirectSound™ 3D and A3D™ interface Supports rear side speakers, C3DX positional audio in 4 CH speaker mode Legacy audio SBPro™ compatible DLS-based wavetable music synthesizer, supports DirectMusic™ Built-in 32ohm Earphone buffer Drivers support EAX™, Karaoke Echo, Key Surround sound 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 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 wavetable music synthesis, and HRTF 3D positional audio functions. Being compatible with A3D™ and DirectSound™ 3D, CMI8738 meets PC99 requirements CMI8738 uses HRTF 3D extension technology to enhance traditional HRTF 3D positional audio by substituting two-speaker system 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 sweet spot limitations: users can enjoy genuine 3D audio gaming effects, and don't have to worry about the environmental confinement any more. Being outstanding for its full audio functions, competitive price, and power 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, who provides one of the world's best HRTF libraries ® ® CMI-8738/PCI Block Diagram 14.318Mhz PCI BUS PCI interface DMA engine IRQ control Earphone buffer LINE OUT MPU 401 and GAME port Legacy audio SB16™emulator 16-bit CODEC 3D Surround Rear L/R MIC IN PLL and timing circuit Music Synthesizer HRTF DSP engine Analog Mixer MIC AMP LINE / CD / AUX / PCPSK IN C-MEDIA ELECTRONICS INC. Tel:886-2-87731100 Fax:886-2-87732211 URL : www.cmedia.com.tw Products and company names mentioned here are the trademarks of their respective owners. 1 Ver. 1.2 CMI-8738/PCI-SX AUDIO Specification PINOUT PINOUT 102 101 100 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 71 70 69 68 67 66 65 U1 NC NC VDDM DGND NC XGD7 XGD6 XGD5 XGD4 XGD3 XGD2 XGD1 XGD0 XRXD XTXD XGPBIO NC XMBCSZ XEECS VDD5V AGND AVDD XMICIN XPCSPKIN XAUXR XAUXL XLNR XLNL XREARR XREARL XCDR XCDL XCDGND XRFILT XLFILT XADCHR XADCHL XADOUTR 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 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 31 32 33 34 35 36 37 38 XA28 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 XA15 XA14 XA13 XA12 GND VDD XA11 NC NC NC NC NC NC XBIO3 XBIO2 XBIO1 XBIO0 NC GND VDD GND XINTA NC XPRST XCLK33 XGNT XREQ NC VDD GND XA31 XA30 XA29 XADOUTL XVREF XINTVREF AVDD AGND NC NC NC XOUT XIN VDD GND XA0 XA1 XA2 XA3 XA4 XA5 GND VDD XA6 XA7 XCBE0 XA8 XA9 XA10 64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40 39 CMI8738 CMI8738-037-SX AUDIO CHIP QFP 128 PINS C-MEDIA ELECTRONICS INC. Tel:886-2-87731100 Fax:886-2-87732211 URL : www.cmedia.com.tw Products and company names mentioned here are the trademarks of their respective owners. 2 Ver. 1.2 CMI-8738/PCI-SX AUDIO Specification PIN DESCRIPTION DIGITAL PIN DESCRIPTION Name XA31-XA0 XINTA XPRST XCLK33 XGNT XREQ XIDSEL XFRAME XIRDY Number PIN Type Definition PCI bus address and data lines Interrupt request , active-low. Reset PCI bus clock. Bus master grant, active-low. Bus master request, tri-state output, active-low. ID select, active-high. Cycle frame, active-low. Initiator ready, active-low. The bus master device is ready to transmit or receive data Target ready, active-low. The target device is ready to transmit or receive data Device select, active-low. The target device has decoded the address of the current transaction as its own chip select range. Stop transaction, active-low. The target device request to the master to stop the current transaction. Parity. The pin indicates even parity across XA31-XA9 and XCBE3-0 for both address and data phases. Multiplexed command/byte enable. These pins indicate cycle type during the address phase of a transaction. Digital and PCI I/O power pin Digital and PCI I/O ground 14.318Mhz crystal, or external clock input 14.318Mhz crystal Game port switch input pin. Switch D to switch A Game port resistor input pin. RC3 to RC0 MIDI transmit data MIDI receive data General purpose I/O Digital and PCI I/O power pin Digital and PCI I/O power pin Digital and PCI I/O ground EEPROM chip select 126-128,1-2,5-7,12-16,19-21,32 I/O -35,38-41,43-44,47-52 117 O 119 I 120 I 121 I 122 O 9 23 24 I I/O I/O XTRDY 25 I/O XDEVSEL 26 I/O XSTOP 29 I/O XPAR 30 I/O XCBE3,2,1,0 8,22,31,42 I/O VDD GND XIN 4,10,18,27,37,45,54,115,124 +5V 3,11,17,28,36,46,53,114,116,12 GND 5 55 I O I I/O O I I/O +5V +5V GND O XOUT 56 XGD7-XGD4 97-94 XGD3-XGD0 93-90 XTXD XRXD XBIO3-XBIO 0 VDD5V VDDM DGND XEECS 88 89 109-112 83 100 99 84 C-MEDIA ELECTRONICS INC. Tel:886-2-87731100 Fax:886-2-87732211 URL : www.cmedia.com.tw Products and company names mentioned here are the trademarks of their respective owners. 3 Ver. 1.2 CMI-8738/PCI-SX AUDIO Specification PIN DESCRIPTION ANALOG PIN DESCRIPTION AVDD AGND XADOUTL-R XADCHL-R XLFILT XRFILT XVREF XINTVREF XCDL-R XCDGND XLNL-R XAUXL-R XPCSPKIN XMICIN XREARL-R XGPBIO XMBCSZ NC 61,81 60,82 64,65 66,67 68 69 63 62 71,72,70 75,76 77,78 79 80 73,74 87 85 57-59,86,98,101-108,113,118,1 23 +5V GND AO1 AI/O AI/O AI/O AI AI AI AI AI AI AI AI/O O I - Analog power Analog ground Line out ADC filter Left channel DAC filter Right channel DAC filter Reference Voltage (no use, left it floating) Reference Voltage CD audio differential input Line in or Rear speaker out Aux. Line in PC beep signal Microphone in Rear speaker out General purpose I/O pin Audio chip select (low:enable) Reserved C-MEDIA ELECTRONICS INC. Tel:886-2-87731100 Fax:886-2-87732211 URL : www.cmedia.com.tw Products and company names mentioned here are the trademarks of their respective owners. 4 Ver. 1.2 CMI-8738/PCI-SX AUDIO Specification ELECTRICAL CHARACTERISTICS Absolute Maximum Ratings Ratings Digital power voltage Analog power voltage Operating temperature range Storage temperature range Maximum power dissipation Symbol VDD AVDD TO TST PDMAX Value VDD±5% AVDD±5% 0 to 70 -40 to 125 300 Units V V °C °C MW Digital Characteristics PARAMETER Input high voltage(PCI I/O) Input low voltage (PCI I/O) Output high voltage Output low voltage Output buffer current Symbol VIH VIL VOH VOL Min 2. -0.5 2.4 0.0 Typ Max VDD+0.5 0.8 VDD 0.4 Unit V V V V mA 0.2 5 Audio Characteristics PARAMETER Analog input voltage Analog output voltage A-A S/N ratio A-A THD ADC S/N ratio ADC THD DAC S/N ratio DAC THD Microphone input level Microphone booster Symbol Avin Avout Min Typ 1.1 1.1 85 0.09 80 0.1 80 0.1 Max Unit VRms VRms db db % db % mv db 0.2 0.2 200 20 20 C-MEDIA ELECTRONICS INC. Tel:886-2-87731100 Fax:886-2-87732211 URL : www.cmedia.com.tw Products and company names mentioned here are the trademarks of their respective owners. 5 Ver. 1.2 CMI-8738/PCI-SX AUDIO Specification Configuration CMI8738 PCI Configuration Spaces 00h 13F6 : (Vender ID) read only 02h 0111 : (Device ID) read only 04h 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) 06h 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 08h 10 : Revision ID 09h 040100 : Audio device 0Ch 00 : Cache Line Size 0Dh 20 : Latency Timer 0Eh 80 : Header Type 0Fh 00 : BIST C-MEDIA ELECTRONICS INC. Tel:886-2-87731100 Fax:886-2-87732211 URL : www.cmedia.com.tw Products and company names mentioned here are the trademarks of their respective owners. 6 Ver. 1.2 CMI-8738/PCI-SX AUDIO Specification Configuration Configuration 10h 0000d401 : I/O of length : -65280(ffff0100h) : First Base Address register 14h 00000000 : Uninitialized : Second Base Address register 18h 00000000 : Uninitialized : Third Base Address register 1Ch 00000000 : Uninitialized : Fourth Base Address register 20h 00000000 : Uninitialized : Fifth Base Address register 24h 00000000 : Uninitialized : Sixth Base Address register 28h 00000000 : Cardbus CIS Pointer 2Ch 13f6 : (SubSystem Vender ID) (R/W) 2Eh ffff : SubSystem ID (R/W) 30h 00000000 : Expansion ROM Base Address 34h 00000000 : Reserved 38h 00000000 : Reserved 3Ch 05 : Interrupt Line 3Dh 01 : Interrupt Pin 3Eh 02 : Min Grant 3Fh 18 : Max Latency DMA Slave Configuration Register(R/W) Bit(s) 31:16 15:4 3 Function Reserved PCI Configuration address 40H Slave Base Address 15-4. INTEL VX chipset seleted if Base Address 15:4=000h Non legacy Extended Addressing 0 1 = = disabled enabled 2:1 Transfer Size 00 = 8 bit transfer 16 bit transfer 32 bit transfer, non legacy Reserved disabled enabled 01 = 10 = 11 = 0 Channel Enable 0 1 = = C-MEDIA ELECTRONICS INC. Tel:886-2-87731100 Fax:886-2-87732211 URL : www.cmedia.com.tw Products and company names mentioned here are the trademarks of their respective owners. 7 Ver. 1.2 CMI-8738/PCI-SX AUDIO Specification PCI register Internal Register Mapping Function Control Register 0 Address Bit(s) R/W Name Description 00 H 31-20 19 18 17 16 15-4 3 2 1 0 Reserved. RST_CH1 RST_CH0 CHEN1 CHEN0 Reserved PAUSE1 PAUSE0 CHADC1 CHADC0 Channel1, 1->Pause if channel1 is enabled. Channel0, 1->Pause if channel0 is enabled. Channel 1 , 1->Recording, Channel 0, 0->Playback 0->Playback Channel1, 1->Reset Channel0, 1->Reset (Default 0) (Default 0) 0->Disabled. 0->Disabled. Channel1, 1->Enabled, Channel0, 1->Enabled, 1->Recording, Function Control Register 1 Address Bit(s) 31-16 15-13 R/W Name Reserved DSFC[2:0] 0 0 0 0 1 1 1 1 12-10 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1 DAC Sampling Frequency Select, 5.512 K 11.025 K 22.05 K 44.1 K 8K 16 K 32 K 48 K ADC Sampling Frequency Select, 0 1 0 1 0 5.512 K 11.025 K 22.05 K 44.1 K 8K Description 04 H ASFC[2:0] 0 0 0 0 1 0 0 1 1 0 C-MEDIA ELECTRONICS INC. Tel:886-2-87731100 Fax:886-2-87732211 URL : www.cmedia.com.tw Products and company names mentioned here are the trademarks of their respective owners. 8 Ver. 1.2 CMI-8738/PCI-SX AUDIO Specification 16 K 32 K 48 K 1 1 1 9-6 5 0 1 1 1 0 1 Reserved INTRM Interrupt Mask bit for MCB (Master control block) module interrupt. 0 1 MCB interrupt disabled. 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 1 3 VOICE_EN 0 1 2 UART_EN Bus Master request disabled(power on state) Bus Master request enabled. This bit enables Legacy Voice device(SB16,FM). Legacy Voice disabled on channel 0. Legacy Voice enabled on channel 0. This bit enables Legacy UART device. 0 1 UART disabled UART enabled 1 JYSTK_EN This bit enables Legacy Joystick device. 0 1 Joystick disabled Joystick enabled 0 Reserved Channel Format Register Address Bit(s) 31-24 23-19 18 to DC value 0002H. 17-16 15-14 Reserved AdcBitLen[1:0] Sample resolution 00 01 10 11 13-12 16 Bits per sample . (Default) 15 Bits per sample. 14 Bits per sample. 13 Bits per sample. R/W Name VER[7:0] Reserved FMOFFSET2 When set 1 and Reg. 24H bit7 ‘FMmute=1’,FM PCM will be forced Description PCI Audio subversion for internal indentification. “01” 08 H AdcDacLen[1:0] Sample resolution 00 01 600nSec per bit in a sample. 660nSec per bit in a sample. C-MEDIA ELECTRONICS INC. Tel:886-2-87731100 Fax:886-2-87732211 URL : www.cmedia.com.tw Products and company names mentioned here are the trademarks of their respective owners. 9 Ver. 1.2 CMI-8738/PCI-SX AUDIO Specification 1.3uSec per bit in a sample. (Default) 2.8uSec per bit in a sample. 10 11 11 10 9 8 7-4 3-2 CH1 Ssmple Rate 176K CH1 Sample Rate 88K CH0 Sample Rate 176K CH0 Sample Rate 88K reserved CH1FMT[1:0] 00 01 10 11 Data format of channel 1 8 bit Mono mode 8 bit Stereo mode 16 bit Mono mode 16 bit Stereo mode Data format of channel0 1-0 CH0FMT[1:0] 00 01 10 11 8 bit Mono mode 8 bit Stereo mode 16bit Mono mode 16 bit Stereo mode Interrupt Hold/Clear Register Address Bit(s) 31-19 18 R/W Name Reserved TDMA_INT_EN Interrupt hold/clear bits for updating TDMA position 0 1 17 CH1_INT_EN 0 1 16 CH0_INT_EN 0 1 15-0 Reserved Interruupt Clear Interrupt Hold if exist. Interrupt hold/clear bits for the Channel 1. Interrupt Clear Interrupt Hold if exist. Interrupt hold/clear bits for the Channel 0. Interrupt Clear Interrupt Hold if exist. Description 0CH Interrupt Register Address Bit(s) 31 R/W R Name INTR Description Interrupt reflected from any sources. 0 No interrupt 10 H C-MEDIA ELECTRONICS INC. Tel:886-2-87731100 Fax:886-2-87732211 URL : www.cmedia.com.tw Products and company names mentioned here are the trademarks of their respective owners. Ver. 1.2 CMI-8738/PCI-SX AUDIO Specification 1 Interrupt pending 30-28 27 26 R R Reserved VCO MCBint Abort conditions occur during PCI Bus Target/Master Access. 0 0 No interrupt Interrupt pending 25-17 16 R Reserved UARTint This bit is the UART interrupt bit. 0 1 No UART interrupt UART interrupt pending Interrupt for updating Low Channel TDMA position. 0 1 No interrupt Interrupt pending Interrupt for updation High Channel TDMA position. 0 1 No interrupt. Interrupt pending. 15 R LTDMAINT 14 R HTDMAINT 13-8 7 6 5 4 3 2 1 R R R R R R R Reserved XDO46 LHBTOG LegHDMA LegStereo Ch1Busy Ch0Busy Chint1 Direct programming EEPROM interface , read data register High/Low status from DMA CTRL register. Legacy is in High DMA channel. Legacy is in Stereo mode. Channel B Busy. Channel A Busy. Channel B Interrupt. 0 1 No interrupt Interrupt pending 0 R Chint0 Channel A Interrupt. 0 1 No interrupt Interrupt pending Legacy Control/Status Register Address Bit(s) 31 30-29 R/W Name Reserved VMPU [1:0] Base address for MPU401 access 00 01 10 Base address : 330h Base address : 320h Base address : 310h Description 14 H C-MEDIA ELECTRONICS INC. Tel:886-2-87731100 Fax:886-2-87732211 URL : www.cmedia.com.tw Products and company names mentioned here are the trademarks of their respective owners. Ver. 1.2 CMI-8738/PCI-SX AUDIO Specification 11 Base address : 300h 28 27-26 VSBSEL[1:0] Reserved The Base Address Select for SB16 access. 00 01 10 11 Base address: 220h Base address: 240h Base address: 260h Base address: 280h 25-24 FMSEL[1:0] The Base Address Select for FM access. 00 01 10 11 Base address : 388h Base address : 3C8h Base address : 3E0h Base address : 3E8h 23-21 20 retry 19 18 17 16 15-0 Reserved SetRetry Mode of wait state . 0:legacy I/O wait (default) 1:legacy I/O BUS C_EEACCESS Direct programming EEPROM interface Registers. C_EECS C_EEDI46 C_EECK46 Reserved Micellaneous Control Register Address Bit(s) 31 30 29-28 27 R/W Name PWD RESET SFIL[1:0] TX/VX Description Power Down Mode enabled.. Reset Bus Master/DSP Engine. Four level of filter control at the front end DAC.. Which motherboard to work with 0 1 26 25-24 23 22 N4SPK3D Reserved ENDBDAC XCHGDAC Default low, High will enable Double DAC structure. Default low, 0 1 21-20 19 Reserved FM_EN Legacy FM enabled. CH0 > Front SPKR, CH0 > Back SPKR, CH1 > Back SPKR. CH1 > Front SPKR. VX chip sets. TX chip sets. 18H Hardware copy front channel to rear channel C-MEDIA ELECTRONICS INC. Tel:886-2-87731100 Fax:886-2-87732211 URL : www.cmedia.com.tw Products and company names mentioned here are the trademarks of their respective owners. Ver. 1.2 CMI-8738/PCI-SX AUDIO Specification 18-17 16 15 14 Reserved VIDWPDSB Reserved MASK_EN Activate channel mask on Legacy DMA. 0 1 Disabled Enabled Sub ID write protect disabled. (default 0) 13 VIDWPDSB Write Protect of HSP Configuration Sub ID. 0 1 Protect. No protect. 12 11-5 4 3-2 SFILENB Reserved MIDSMP Let software contrl filter stepping at the front end DAC. Enable 1/2 interpolation at the Front end DAC.. 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. 1-0 TWAIT[1:0] For controling the length of legacy BUS cycle. 00 01 10 11 3 PCICLK. 18 PCICLK. 24 PCICLK 32 PCICLK * Notice REQ_SQ[2:0] MM_DATA MIDLE REQA/REQB GNTA/GNTB ADRQ/BDRQ ADACK/BDACK AIRQ/BIRQ CX/BX States of BusRequest Engine. Bus Master is using Bus. Bus Master is not using Bus. Channel 0/1 BusMaster Request. Channel 0/1 BusMaster Grant. Channel 0/1 DMA Request. Channel 0/1 DMA Acknoledge. Channel 0/1 Interrupt. Channel 0/1 Busy. T - DMA Position Address 1CH Bit(s) 31-16 R/W R Name TDMACN T Description Current Byte/Word Count of DMA channel. 15-0 R TDMAADR Current Address of DMA channel. C-MEDIA ELECTRONICS INC. Tel:886-2-87731100 Fax:886-2-87732211 URL : www.cmedia.com.tw Products and company names mentioned here are the trademarks of their respective owners. Ver. 1.2 CMI-8738/PCI-SX AUDIO Specification Mixer Control / Device Configure Register (can be accessed only by BYTE instruction) Address 20 H Bit(s) 7-0 R/W W R Name SBVR[7:0] DEV[7:0] Description Programmable SB16 version No. Hardwire device version No. Address 21H Bit(s) 7-3 2 1 0 R/W Name Reserved X_ADPCM PROINV X_SB16 Description SB16 ADPCM enable,default disabled. SBPro Left/Right channel switching. Indicate device active as SB16 compatible, default SB16 Address 22 H Bit(s) 7-0 R/W Name IDXdata Description Mapping SB compatible mixer INDEX register data port(A2x5h) Address 23 H Bit(s) 7-0 R/W Name IDXaddr Description Mapping SB compatible mixer INDEX register address port(A2x4h) Address 24 H Bit(s) 7 6 5 4 3 2 1-0 R/W Name Fmmute Wsmute SPK4 Rear2front Waveinl Waveinr Reserved Description Mute FM Mute Wave stream select four speaker mode(emulate Line in to Line out ) exchange rear and front channels’s speaker out Digital Wave recording Left channel Digital Wave recording Right channel Address 25 H Bit(s) 7 6 5 4 R/W Name RAUXREN RAUXLEN VAUXRM VAUXLM Description Recording source select R-Aux Recording source select L_Aux R-AUX mute control L-AUX mute control C-MEDIA ELECTRONICS INC. Tel:886-2-87731100 Fax:886-2-87732211 URL : www.cmedia.com.tw Products and company names mentioned here are the trademarks of their respective owners. Ver. 1.2 3-1 0 VADMIC[2:0] MICGAINZ CMI-8738/PCI-SX AUDIO Specification Recording MIC volume control MIC gain control,default high disable Address 26 H Bit(s) 7-4 3-0 R/W Name VAUXL[3:0] VAUXR[3:0] Description L-AUX volume control R-AUX volume control Address 27 H Bit(s) 0 1 2 R/W Name DMAUTO Reserved XGPBIO Description SB16 Low/High DMA Auto detect enabled ,When high. general purpose bi-direction pin, when high output tri-state (default LOW) 3 4 5 Reserved Reserved 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 FM PCI Port Index address 40-4FH PCI Port Index address 50-5FH Extension Index Register (access from SB compatible mixer port) Index address F0H Bit(s) 7-5 4 3 2 1 0 R/W Name VPHONE[2:0] VPHOM VSPKM RLOOPREN RLOOPLEN VADMIC3 Description Phone volume control Phone mute control PC-Speaker mute control,default high unmute Recording R-channel enable Recording L-channel enable Micphone record boost, default low disable, high enable. Index address F8-FFH These 8 registers is used to programming M/N conunter by clock generator C-MEDIA ELECTRONICS INC. Tel:886-2-87731100 Fax:886-2-87732211 URL : www.cmedia.com.tw Products and company names mentioned here are the trademarks of their respective owners. Ver. 1.2 CMI-8738/PCI-SX AUDIO Specification Channel 0 Frame Register 1 Address 80 H Bit(s) 31-0 R/W W R Name BASADDR0 CURADDR0 Description Base address of channel 0. Current address of channel 0. Channel 0 Frame Register 2 Address 84 H Bit(s) 31-16 15-0 31-16 15-0 R/W W W R R Name BASCNT0 BASCNT0 CURCNT0 CURCNT0 Description Base count of samples at Codec. Base count of samples at Bus Master. Current count of samples at Codec. Current count of samples at Bus Master. Channel 1 Frame Register 1 Address 88 H Bit(s) 31-0 R/W W R Name BASADDR1 CURADDR1 Description Base address of channel 0. Current address of channel 0. Channel 1 Frame Register 2 Address 8CH Bit(s) 31-16 15-0 31-16 15-0 R/W W W R R Name BASCNT1 BASCNT1 CURCNT1 CURCNT1 Description Base count of samples at Codec. Base count of samples at Bus Master. Current count of samples at Codec. Current count of samples at Bus Master. C-MEDIA ELECTRONICS INC. Tel:886-2-87731100 Fax:886-2-87732211 URL : www.cmedia.com.tw Products and company names mentioned here are the trademarks of their respective owners. Ver. 1.2 CMI-8738/PCI-SX AUDIO Specification Legacy SB compatible mixer Index D7 D6 D5 0x00 0x04 0x0A 0x22 0x26 0x28 0x2E 0x30 0x31 0x32 0x33 0x34 0x35 0x36 0x37 0x38 0x39 0x3A 0x3B 0x3C 0x3D 0x3E 0x3F 0x40 0x41 0x42 0x43 0x44 0x45 0x46 0x47 0x80 0x81 0x82 D4 D3 D2 D1 D0 Reserved Wave volume left channel Wave volume right channel Mic volume Master volume left channel Master volume right channel FM volume left channel FM volume right channel Analog-CD volume left channel Analog-CD volume right channel Line-in volume left channel Line-in volume right channel Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved PC spk volume Output muting controls Line L Line R CD L CD R Mic Recording left channel controls FM L FM R Line L Line R CD L CD R Mic Recording right channel controls FM L FM R Line L Line R CD L CD R Mic Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved IRQ channel (read only) IRQ10 IRQ7 IRQ5 IRQ2(9) 16 bit DMA channel (read only) 8 bit DMA channel (read only) DMA 1 DMA 0 DMA 7 DMA 5 DMA 3 Interrupt status (read only) MPU-40 16bit 8bit 1 DMA DMA Please do not write any values into reserved registers C-MEDIA ELECTRONICS INC. Tel:886-2-87731100 Fax:886-2-87732211 URL : www.cmedia.com.tw Products and company names mentioned here are the trademarks of their respective owners. Ver. 1.2 CMI-8738/PCI-SX AUDIO Specification Audio Processing Technology 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. locations of the speakers. Sound sources appear to come from outside the physical 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. C-MEDIA ELECTRONICS INC. Tel:886-2-87731100 Fax:886-2-87732211 URL : www.cmedia.com.tw Products and company names mentioned here are the trademarks of their respective owners. Ver. 1.2 CMI-8738/PCI-SX 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. two speakers or a pair of headphones. This technology allows people to pin-point the location of sound in the real world (up/down, left/right, front/back)using only This technology also supports interactive 3D We can also use this technology to applications to get a real-time placement of sounds via API (application programming interface) such as Microsoft DirectSound3DTM. 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-MEDIA ELECTRONICS INC. Tel:886-2-87731100 Fax:886-2-87732211 URL : www.cmedia.com.tw Products and company names mentioned here are the trademarks of their respective owners. Ver. 1.2 CMI-8738/PCI-SX AUDIO Specification Audio Processing Technology 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 To remedy this, Therefore, at "head-turners" who will never get 3D audio from two speakers . C-Media utilizes HRTF 3D extension technology (C3DX) to enhance traditional HRTF 3D positional audio by substituting two-speaker system by four-speaker one. least one or two speakers should be placed the rear-side effect, thus creating compelling realistic sound. behind the listener's head to complement 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 C-MEDIA ELECTRONICS INC. Tel:886-2-87731100 Fax:886-2-87732211 URL : www.cmedia.com.tw Products and company names mentioned here are the trademarks of their respective owners. Ver. 1.2 CMI-8738/PCI-SX AUDIO Specification HRTF 3D Positional Audio Technology White-Paper 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. converge and diverge gently. primary 3D sound cues. The effects of diffraction are most noticeable in the range between about 700 Hz to 8 KHz, where the A and S functions periodically This Inter-aural Amplitude difference (IAD) is one of the C-MEDIA ELECTRONICS INC. Tel:886-2-87731100 Fax:886-2-87732211 URL : www.cmedia.com.tw Products and company names mentioned here are the trademarks of their respective owners. Ver. 1.2 CMI-8738/PCI-SX AUDIO Specification HRTF 3D Positional Audio Technology White-Paper 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-MEDIA ELECTRONICS INC. Tel:886-2-87731100 Fax:886-2-87732211 URL : www.cmedia.com.tw Products and company names mentioned here are the trademarks of their respective owners. Ver. 1.2 CMI-8738/PCI-SX AUDIO Specification HRTF 3D Positional Audio Technology White-Paper 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. extinguished. For example, if the fossa is excluded, then height localization capability is impaired, but not totally 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. for frontal sources than lateral ones. appear to contribute much to spatial accuracy. The effect is greater In experience, the presence of the torso does not However, shoulders are located very close to the ears, and their effect is greater, this time, in respect of C-MEDIA ELECTRONICS INC. Tel:886-2-87731100 Fax:886-2-87732211 URL : www.cmedia.com.tw Products and company names mentioned here are the trademarks of their respective owners. Ver. 1.2 lateral sounds. CMI-8738/PCI-SX AUDIO Specification HRTF 3D Positional Audio Technology White-Paper 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. accurately simulated - are relatively slight. However, the effects - if 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. nearby, you would expect it to be downwards. For example, if you hear the sound of a If a dog is barking helicopter flying, you expect it to be up in the air, and not downwards. C-MEDIA ELECTRONICS INC. Tel:886-2-87731100 Fax:886-2-87732211 URL : www.cmedia.com.tw Products and company names mentioned here are the trademarks of their respective owners. Ver. 1.2 CMI-8738/PCI-SX AUDIO Specification HRTF 3D Positional Audio Technology White-Paper 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. positional audio effect. Listening through speakers must be proceeded by crosstalk-cancellation, so if you choose the wrong output devices, there won’t be any 3D C-MEDIA ELECTRONICS INC. Tel:886-2-87731100 Fax:886-2-87732211 URL : www.cmedia.com.tw Products and company names mentioned here are the trademarks of their respective owners. Ver. 1.2 CMI-8738/PCI-SX AUDIO Specification HRTF 3D Positional Audio Technology White-Paper 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-MEDIA ELECTRONICS INC. Tel:886-2-87731100 Fax:886-2-87732211 URL : www.cmedia.com.tw Products and company names mentioned here are the trademarks of their respective owners. Ver. 1.2 CMI-8738/PCI-SX AUDIO Specification Audio Rack Panel Audio Rack Panel Two Speakers System : Line-In becomes Rear Speakers Output 4 Speakers system Enable Four Speakers System : C-MEDIA ELECTRONICS INC. Tel:886-2-87731100 Fax:886-2-87732211 URL : www.cmedia.com.tw Products and company names mentioned here are the trademarks of their respective owners. Ver. 1.2 CMI-8738/PCI-SX AUDIO Specification CMI8738 PCI Audio Adapter Layout Notes 1. The wires of analog circuits(chip pin64-80) must be wider than 12mil. 2. 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.). 3. The grounding under CMI8738 should be well-organized as mentioned above. 4. The regulator(78L05) must be placed near the chip as much as possible. 5. 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.cmedia.com.tw Products and company names mentioned here are the trademarks of their respective owners.