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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-- -- --