STAC9752 Datasheet, PDF (29/95 Pages) Integrated Device Technology – TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH HEADPHONE DRIVE, SPDIF OUTPUT MICROPHONE & JACK SENSING

STAC9752/9753
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
SLOTS
SYNC
OUTGOING STREAMS
(Controller output - SDATA_OUT)
INCOMING STREAMS
(codec output - SDATA_IN)
TAG PHASE
0 1 2 3 4 5 6 7 8 9 10 11 12
TAG
CMD CMD PCM
ADDR DATA LEFT
PCM
RT
NA
PCM PCM
PCM
CTR LSURR RSURR
PCM
LFE
SPDIF
SPDIF
IO
CTRL
TAG
STATUS STATUS PCM
ADDR DATA LEFT
PCM
RT
LINE1 PCM Vendor Vendor Vendor LINE2 HSET
IO
ADC
MIC RSVD RSVD RSVD ADC ADC STATUS
DATA PHASE
Slot 12 can be used by the
AC'97 Codec if a Modem
Codec is not present.
Table 4. AC-Link output slots (transmitted from the Controller)
Slot
Name
Description
0
SDATA_OUT TAG
MSBs indicate which slots contain valid data; LSBs convey
CODEC ID
1
Control CMD ADDR write port Read/write command bit plus 7-bit CODEC register address
2
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
5
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
10
Modem Line 2 DAC
16-bit modem data for modem Line 2 output
11
Modem handset DAC
16-bit modem data for modem Handset output
12
Modem I/O control
GPIO write port for modem Control
12
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
IDT™
29
STAC9752/9753
TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH HEADPHONE DRIVE, SPDIF OUTPUT MICROPHONE & JACK SENSING
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