STAC9752A Datasheet, PDF (88/106 Pages) Integrated Device Technology – AC’97 2.3 CODECS WITH STEREO MICROPHONE & UNIVERSAL JACK

STAC9752A/9753A
AC’97 2.3 CODECS WITH STEREO MICROPHONE & UNIVERSAL JACK
PC AUDIO
9.2. 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 STAC9752A/9753A will disregard the Command Address and Com-
mand Data (Slot 0, bits 14 and 13) tag bits unless 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 alterna-
tive 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.
Table 30. Secondary CODEC Register Access Slot 0 Bit Definitions
Output Tag Slot (16-bits)
Bit
Description
15
Frame Valid
14
Slot 1 Valid Command Address bit (†Primary CODEC only)
13
Slot 2 Valid Command Data bit (†Primary CODEC only)
12-3
Slot 3-12 Valid bits as defined by AC'97
2
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
Using three CODECs typically requires a controller to support SDATA_IN2.
IDT™
88
AC’97 2.3 CODECS WITH STEREO MICROPHONE & UNIVERSAL JACK
STAC9752A/9753A
V 1.5 1206