STAC9752 datasheet(83/95 Pages) IDT

83 / 95 page

STAC9752/9753

TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH HEADPHONE DRIVE, SPDIF OUTPUT MICROPHONE & JACK SENSING

IDT™

STAC9752/9753

REV 3.3 1206

TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH HEADPHONE DRIVE, SPDIF OUTPUT MICROPHONE & JACK SENSING

10.2. Secondary CODEC Register Access Definitions

The AC'97 Digital Controller can independently access Primary and Secondary CODEC registers by

using a 2-bit CODEC ID field (chip select) which is defined as the LSBs of Output Slot 0. For Sec-

ondary CODEC access, the AC'97 Digital Controller must invalidate the tag bits for Slot 1 and 2

Command Address and Data (Slot 0, bits 14 and 13) and place a non-zero value (01, 10, or 11) into

the CODEC ID field (Slot 0, bits 1 and 0).

As a Secondary CODEC, the STAC9752/9753 will disregard the Command Address and Command

Data (Slot 0, bits 14 and 13) tag bits when it sees a 2-bit CODEC ID value (Slot 0, bits 1 and 0) that

matches its configuration. In a sense the Secondary CODEC ID field functions as an alternative

Valid Command Address (for Secondary reads and writes) and Command Data (for Secondary

writes) tag indicator.

Secondary CODECs must monitor the Frame Valid bit, and ignore the frame (regardless of the state

of the Secondary CODEC ID bits) if it is not valid. AC'97 Digital Controllers should set the frame valid

bit for a frame with a secondary register access, even if no other bits in the output tag slot except the

Secondary CODEC ID bits are set.

This method is designed to be backward compatible with existing AC'97 controllers and CODECs.

There is no change to output Slot 1 or 2 definitions.

Using three CODECs typically requires a controller to support SDATA_IN2.

Table 29. Secondary CODEC Register Access Slot 0 Bit Definitions

Output Tag Slot (16-bits)

Bit

Description

Frame Valid

Slot 1 Valid Command Address bit (†Primary CODEC only)

Slot 2 Valid Command Data bit (†Primary CODEC only)

12-3

Slot 3-12 Valid bits as defined by AC'97

Reserved (Set to 0)

†1-0

2-bit CODEC ID field

(00 reserved for Primary; 01, 10, 11 indicate Secondary)

Note:

† New definitions for Secondary CODEC Register Access

STAC9752 Datasheet(PDF) 83 Page - Integrated Device Technology