STAC9752 datasheet(29/95 Pages) IDT

29 / 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

5. AC-LINK DIGITAL INTERFACE

5.1.

Overview

AC-Link is the 5 pin digital serial interface that links the AC‘97 CODEC to the 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 STAC9752/9753 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 I/O 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 88.2 KHz or 96 KHz 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.

STAC9752 Datasheet(PDF) 29 Page - Integrated Device Technology

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