Technical Reference Guide
361834-002
5-33
Input/Output Interfaces
5.8.4 Audio Programming
Audio subsystem programming consists configuration, typically accomplished during POST, and
control, which occurs during runtime.
Audio Configuration
The audio subsystem is configured according to PCI protocol through the AC97 audio controller
function of the 82801 ICH. Table 5-24 lists the PCI configuration registers of the audio
subsystem.
Table 5-24.
AC97 Audio Controller
PCI Configuration Registers (82801 Device 31/Function 5)
PCI Config.
Address
Register
Value on
Reset
PCI
Config.
Address
Register
Value on
Reset
00-01h
Vendor ID
8086h
14-17h
Native Audio Bus
Mstr. Addr.
1
02-03h
Device ID
24D5h
18-1Bh
Reserved
1h
04-05h
PCI Command
0000h
1C-2Bh
Reserved
1h
06-07h
PCI Status
0280h
2C-2Dh
Subsystem Vender ID
0000h
08h
Revision ID
XXh
2E-2Fh
Subsystem ID
0000h
09h
Programming
00h
30-3Bh
Reserved
--
0Ah
Sub-Class
01h
3Ch
Interrupt Line
00h
0Bh
Base Class Code
04h
3Dh
Interrupt Pin
02h
0Eh
Header Type
00h
3E-FFh
Reserved
0’s
10-13h
Native Audio Mixer
Base Addr.
1
--
--
--
Summary of Contents for Compaq dc71 Series
Page 50: ...2 34 361834 002 Technical Reference Guide System Overview ...
Page 58: ...3 8 361834 002 Technical Reference Guide Processor Memory Subsystem ...
Page 126: ...5 40 361834 002 Technical Reference Guide Input Output Interfaces ...
Page 168: ...8 20 361834 002 Technical Reference Guide BIOS ROM ...
Page 188: ...A 20 361834 002 Technical Reference Guide Error Messages and Codes ...
Page 192: ...B 4 361834 002 Technical Reference Guide ASCII Character Set ...
Page 210: ...C 18 361834 002 Technical Reference Guide Keyboard ...