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Introduction
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AC ’97 Programmer’s Reference Manual 7
1 Introduction
1.1 About This Document
This document was prepared to assist Independent Hardware and Software Vendors (IHVs and
ISVs) in supporting the Intel
®
I/O controller hub (ICH5) AC ’97 controller feature set. This
document also applies to the previous generation of Intel I/O controller hub components and
describes the general requirements to develop an audio driver that will make use of the AC ’97
audio interface.
This document also describes functions that the BIOS or Operating Systems (OS) must perform in
order to ensure correct and reliable operation of the platform. This document will be supplemented
from time to time with specification updates. The specification updates contain information
relating to the latest programming changes. Check with your Intel representative for availability of
specification updates.
The following table outlines ICH device information at a glance.
Table 1. Applicable Components
Device Name
Vendor ID
Device ID
Subsystem Vendor
ID
Subsystem Device
ID
Base Class Code
Sub-Class Code
Prog. Interface
Revision ID
Bus Number (PCI
Addr
)
Device Number
Function Number
Microsoft PNP
Device Node ID
Intel Desired Device
Description (INF
name) Name for:
Microsoft Windows*
Operating System
Intel
®
ICH
8086 2415 Default is 00h.
Value of this
register varies
according to the
system
Default is 00h.
Value of this
register varies
according to the
system
04h 01h 00h ALL 00h 1Fh 5 PCI\VEN_8086&DE
V_2415 (subsystem
will also provide
additional
information)
Intel
®
82801AA AC ‘97
Audio Controller
(displayed by driver
provider’s INF)
Intel
ICH
8086 2416 Default is 00h.
Value of this
register varies
according to the
system
Default is 00h.
Value of this
register varies
according to the
system
07h 03h 00h ALL 00h 1Fh 6 PCI\VEN_8086&DE
V_2416 (subsystem
will also provide
additional
information)
Intel 82801AA AC ‘97
Modem Controller
(displayed by driver
provider’s INF)
Intel
ICH-0
8086 2425 Default is 00h.
Value of this
register varies
according to the
system
Default is 00h.
Value of this
register varies
according to the
system
04h 01h 00h ALL 00h 1Fh 5 PCI\VEN_8086&DE
V_2425
(subsystem will also
provide additional
information)
Intel
®
82801AB AC ‘97
Audio Controller
(displayed by driver
provider’s INF)