Audio Programming - HP Compaq dc7600 MT Technical Reference Manual

5.8.4 Audio Programming

Audio subsystem programming consists of configuration, typically accomplished during POST,
and control, which occurs during runtime.
Audio Configuration
The audio subsystem is configured according to PCI protocol through the HD audio controller
function of the 82801 ICH. Table 5-24 lists the PCI configuration registers of the audio
subsystem.
PCI Configuration Registers (82801 Device 27/Function 0)
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 HD Audio Lower Base
Addr.
NOTE:
Values without "h" suffix (denoting hexidecimal value) are decimal.
[1] Refer to Intel data sheet for more information.
Technical Reference Guide
Table 5-24.
HD Audio Controller
PCI
Value on Config.
Reset Address
8086h 14-17h
24D5h 2C-2Dh
0000h 2E-2Fh
0280h 34h
XXh 3Ch
00h 3Dh
01h 40h
04h 44h
00h 4C, 4Dh
4 50-14Fh
www.hp.com
Input/Output Interfaces
Value on
Register Reset
HD Audio Upper
Base. Addr.
Subsystem Vender ID 0000h
Subsystem ID 0000h
Capability List Pointer
Interrupt Line
Interrupt Pin
HD Audio Control
Traffic Class Select
Docking 0080h
Control/Status
-HD audio functions
0
50h
00h
02h
0's
00h
[1]
5-33