STAC9766 datasheet(32/97 Pages) IDT

32 / 97 page

STAC9766/9767

TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING

PC AUDIO

IDT™

STAC9766/9767

V 7.4 12/06

TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING

12 bit positions, which are stuffed with 0 by the AC‘97 Controller. This ensures that regardless of the

resolution of the implemented DAC (16, 18 or 20-bit), no DC biasing will be introduced by the least

significant bits.

When mono audio sample streams are output from the AC‘97 Controller it is necessary that BOTH

left and right sample stream time slots be filled with the same data.

5.3.1.

Slot 0: TAG / CODEC ID

Note: The DAC can be assigned to slots 3&4, 6&9, 7&8, or 10&11.

Within slot 0, the first bit is a global bit (SDATA_OUT slot 0, bit 15) which flags the validity for the

entire audio frame. If the “Valid Frame” bit is a 1, this indicates that the current audio frame contains

at least one time slot of valid data. The next 12 bit positions sampled by AC‘97 indicate which of the

corresponding 12 time slots contain valid data. In this way data streams of differing sample rates can

be transmitted across AC-link at its fixed 48 KHz audio frame rate.

The two LSBs of Slot 0 transmit the CODEC ID used to distinguish Primary and Secondary CODEC

5.3.2.

Slot 1: Command Address Port

The command port is used to control features, and monitor status (see AC-link input frame Slots 1

and 2) for AC‘97 CODEC functions including, but not limited to, mixer settings and power manage-

ment (refer to the control register section of this specification).

Table 7. Output Slot 0 Bit Definitions

Bit

Description

Frame Valid

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

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

Slot 3-12 Valid Data bits

Slot 3: PCM Left channel

Slot 4: PCM Right channel

Slot 5: Modem Line 1 (not used on STAC9766/9767)

Slot 6: Alternative PCM1 Left

Slot 7: Alternative PCM2 Left

Slot 8: Alternative PCM2 Right

Slot 9: Alternative PCM1 Right

Slot 10: SPDIF Left

Slot 11: SPDIF Right

Slot 12: Audio GPIO

Reserved (Set to 0)

1-0

2-bit CODEC ID field (00 reserved for Primary; 01, 10, 11 indicate Secondary)

STAC9766 Datasheet(PDF) 32 Page - Integrated Device Technology

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