Audio Programming - HP Compaq dc7100 DT Technical Reference Manual

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.
PCI Configuration Registers (82801 Device 31/Function 5)
PCI Config.
Address Register
00-01h Vendor ID
02-03h Device ID
04-05h PCI Command
06-07h PCI Status
08h Revision ID
09h Programming
0Ah Sub-Class
0Bh Base Class Code
0Eh Header Type
10-13h Native Audio Mixer
Base Addr.
Technical Reference Guide
Table 5-24.
AC97 Audio Controller
PCI
Value on Config.
Reset Address
8086h 14-17h
24D5h 18-1Bh
0000h 1C-2Bh
0280h 2C-2Dh
XXh 2E-2Fh
00h 30-3Bh
01h 3Ch
04h 3Dh
00h 3E-FFh
1 --
361834-002
Input/Output Interfaces
Value on
Register Reset
Native Audio Bus
Mstr. Addr.
Reserved
Reserved
Subsystem Vender ID 0000h
Subsystem ID 0000h
Reserved
Interrupt Line
Interrupt Pin
Reserved
--
1
1h
1h
--
00h
02h
0's
--
5-33