STAC9752A datasheet(72/106 Pages) IDT

72 / 106 page

STAC9752A/9753A

AC’97 2.3 CODECS WITH STEREO MICROPHONE & UNIVERSAL JACK

PC AUDIO

IDT™

STAC9752A/9753A

V 1.5 1206

AC’97 2.3 CODECS WITH STEREO MICROPHONE & UNIVERSAL JACK

7.3.

Extended CODEC Registers Page Structure Definition

Registers 60h-68h are the Extended CODEC Registers: These registers allow for the definition of

further capabilities. These bits provide a paged address space for extended CODEC information.

The Page Selector bits in the Audio Interrupt and Paging register (Register 24h bits 3:0) control the

page of information viewed through this page window.

7.3.1.

Extended Registers Page 00

Page 00 of the Extended CODEC Registers is reserved for vendor specific use. Driver writers should

not access these registers unless the Vendor ID register has been checked first to ensure that the

vendor of the AC '97 component has been identified and the usage of the vendor defined registers

understood.

7.3.2.

Extended Registers Page 01

The usage of Page 01 of the Extended CODEC Registers is defined in Register 24h found in

Section7.1.17: page61.

7.3.3.

Extended Registers Page 02, 03

Pages 02 and 03 of the Extended CODEC Registers are reserved for future use.

7.4.

STAC9752A/9753A Paging Registers

The AC’97 Specification Rev 2.3 uses a paging mechanism in order to increase the number of regis-

ters. The registers currently used in the paging are 60h to 6Eh. Additional information about the

Extended CODEC Registers, please refer to Section 7.3: page72.

One of two pages can be made active at any time, set in Register 24h. Register 24h is the Audio

Interrupt and Paging Register. Additional details about Register 24h is located in Section 7.1.17:

page61.

If page 00h is active, registers 60h to 6Eh are Vendor Specific.

If page 01h is active, registers 60h to 6Eh have the following functionality:

Reg

NAME

FUNCTION

Location

60h CODECClass/Revision

Provides the CODEC Class and a Vendor specified revision

identifier.

7.4.1: page73

62h

PCI SVID

Allows for population by the system BIOS to identify the PCI Sub

System Vendor ID.

7.4.2: page73

64h

PCI SSID

Allows for population by the system BIOS to identify the PCI Sub

System ID.

Note:: page74

66h

Function Select

Provides the type of audio function being selected and which jack

conductor the selected value is measured from.

Note:: page74

STAC9752A Datasheet(PDF) 72 Page - Integrated Device Technology

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