STAC9767 datasheet(27/97 Pages) IDT

27 / 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

5. AC-LINK DIGITAL INTERFACE

5.1.

Overview

AC-link is the 5 pin digital serial interface that links AC‘97 CODEC to Controller. The AC-link protocol

is a bi-directional, fixed clock rate, serial digital stream. AC-link handles multiple input and output

PCM audio streams, as well as control register accesses, employing a time division multiplexed

(TDM) scheme that divides each audio frame into 12 outgoing and 12 incoming data streams, each

with 20-bit sample resolution.

The STAC9766/9767 DACs, ADCs and SPDIF can be assigned to slots 3&4, 6&9, 7&8 or 10&11.

Figure 14. Bi-directional AC-link Frame with Slot Assignments

Table 4. AC-link Output Slots (Transmitted from the Controller)

Slot

Name

Description

SDATA_OUT TAG

MSBs indicate which slots contain valid data; LSBs convey

CODEC ID

Control CMD ADDR write port

Read/write command bit plus 7-bit CODEC register address

Control DATA write port

16-bit command register write data

3, 4

PCM L&R DAC playback

20-bit PCM data for Left and Right channels

Modem Line 1 DAC

16-bit modem data for modem Line 1 output

6, 7, 8, 9 PCM Center, Surround L&R, LFE 20-bit PCM data for Center, Surround L&R, LFE channels

Modem Line 2 DAC

16-bit modem data for modem Line 2 output

Modem handset DAC

16-bit modem data for modem Handset output

Modem IO control

GPIO write port for modem Control

CODEC IRQ

Can be used by CODEC if a modem CODEC is not present.

10-11

SPDIF Out

Optional AC-link bandwidth for SPDIF output

10-12

Double rate audio

Optional AC-link bandwidth for 88.26KHz or 96KHz on L, C, R

channels

PCM

MIC

Vendor

RSVD

Vendor

RSVD

LINE2

ADC

HSET

ADC

Vendor

RSVD

STATUS

ADDR

OUTGOING STREAMS

(Controller output - SDATA_OUT)

INCOMING STREAMS

(codec output - SDATA_IN)

SYNC

TAG PHASE

DATA PHASE

PCM

LEFT

CMD

ADDR

PCM

LSURR

PCM

LFE

SPDIF

TAG

CMD

DATA

PCM

CTR

PCM

RSURR

SPDIF

CTRL

PCM

LEFT

LINE1

ADC

TAG

STATUS

DATA

PCM

STATUS

SLOTS

Slot 12 can be used by the

AC'97 Codec if a Modem

Codec is not present.

STAC9767 Datasheet(PDF) 27 Page - Integrated Device Technology

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