Audio Programming - HP dx7300 Technical Reference Manual

Input/Output Interfaces

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 5-22 lists the PCI configuration registers of the audio
subsystem.
PCI Configuration Registers (82801 Device 27/Function 0)
PCI Config.
Address
00-01h
02-03h
04-05h
06-07h
08h
09h
0Ah
0Bh
0Eh
10- 1 3h
NOTE:
Values without "h" suffix (denoting hexidecimal value) are decimal.
[1] Refer to Intel data sheet for more information.
5-30
HD Audio Controller
Value on
Register Reset
Vendor ID 8086h
Device ID 24D5h
PCI Command 0000h
PCI Status 0280h
Revision ID
Programming
Sub-Class
Base Class Code
Header Type
HD Audio Lower Base
Addr.
Table 5-22.
PCI
Config.
Address Register
14- 1 7h HD Audio Upper
Base. Addr.
2C-2Dh Subsystem Vender ID
2E-2Fh Subsystem ID
34h Capability List Pointer
XXh 3Ch Interrupt Line
00h 3Dh Interrupt Pin
01h 40h HD Audio Control
04h 44h Traffic Class Select
00h 4C, 4Dh Docking
Control/Status
4 50- 1 4Fh -HD audio functions
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Value on
Reset
0
0000h
0000h
50h
00h
02h
0's
00h
0080h
[1]
Technical Reference Guide