Compaq dc7100 HP Compaq dc71xx and dx61xx Series Business Desktop Computers Te - Page 120

Audio Control, Table 5-25., AC97 Audio Codec Control Registers

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Input/Output Interfaces Audio Control The audio subsystem is controlled through a set of indexed registers that physically reside in the audio codec . The register addresses are decoded by the audio controller and forwarded to the audio codec over the AC97 Link Bus previously described. The audio codec's control registers (Table 5-25) are mapped into 64 kilobytes of variable I/O space. Table 5-25. AC97 Audio Codec Control Registers Offset Address or Register Value On Offset Address or Reset Register Value On Offset Address or Reset Register Value On Reset 00h Reset 0100h 14h Video Vol. 8808h 28h Ext. Audio ID. 0001h 02h Master Vol. 8000h 16h Aux Vol. 8808h 2Ah Ext. Audio Ctrl/Sts 0000h 04h Reserved -- 18h PCM Out Vol. 8808h 2Ch PCM DAC SRate BB80h 06h Mono Mstr. Vol. 8000h 1Ah Record Sel. 0000h 32h PCM ADC SRate BB80h 08h Reserved -- 1Ch Record Gain 8000h 34h Reserved -- 0Ah PC Beep Vol. 8000h 1Eh Reserved -- 72h Reserved -- 0Ch Phone In Vol. 8008h 20h Gen. Purpose 0000h 74h Serial Config. 7x0xh 0Eh Mic Vol. 8008h 22h 3D Control 0000h 76h Misc. Control Bits 0404h 10h Line In Vol. 8808h 24h Reserved -- 7Ch Vender ID1 4144h 12h CD Vol. 8808h 26h Pwr Mgnt. 000xh 7Eh Vender ID2 5340h 5-34 361834-002 Technical Reference Guide

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5-34
361834-002
Technical Reference Guide
Input/Output Interfaces
Audio Control
The audio subsystem is controlled through a set of indexed registers that physically reside in the
audio codec . The register addresses are decoded by the audio controller and forwarded to the
audio codec over the AC97 Link Bus previously described. The audio codec's control registers
(Table 5-25) are mapped into 64 kilobytes of variable I/O space.
Table 5-25.
AC97 Audio Codec Control Registers
Offset Address or
Register
Value
On
Reset
Offset Address or
Register
Value
On
Reset
Offset Address or
Register
Value
On
Reset
00h
Reset
0100h
14h
Video Vol.
8808h
28h
Ext. Audio ID.
0001h
02h
Master Vol.
8000h
16h
Aux Vol.
8808h
2Ah
Ext. Audio Ctrl/Sts
0000h
04h
Reserved
--
18h
PCM Out Vol.
8808h
2Ch
PCM DAC SRate
BB80h
06h
Mono Mstr. Vol.
8000h
1Ah
Record Sel.
0000h
32h
PCM ADC SRate
BB80h
08h
Reserved
--
1Ch
Record Gain
8000h
34h
Reserved
--
0Ah
PC Beep Vol.
8000h
1Eh
Reserved
--
72h
Reserved
--
0Ch
Phone In Vol.
8008h
20h
Gen. Purpose
0000h
74h
Serial Config.
7x0xh
0Eh
Mic Vol.
8008h
22h
3D Control
0000h
76h
Misc. Control Bits
0404h
10h
Line In Vol.
8808h
24h
Reserved
--
7Ch
Vender ID1
4144h
12h
CD Vol.
8808h
26h
Pwr Mgnt.
000xh
7Eh
Vender ID2
5340h