STAC9758 Datasheet, PDF (31/119 Pages) Integrated Device Technology – HIGH-PERFORMANCE 6-CHANNEL AC’97 2.3 CODEC WITH UNIVERSAL JACKS

STAC9758/9759
HIGH-PERFORMANCE 6-CHANNEL AC’97 2.3 CODEC WITH UNIVERSAL JACKS™
PC AUDIO
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 proto-
col 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 STAC9758/9759 DACs, ADCs, and SPDIF can be assigned to slots 3&4, 6&9, 7&8 or 10&11.
Figure 13. 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
ADDR DATA
PCM
LEFT
PCM
RT
NA
PCM PCM PCM
CTR LSURR RSURR
PCM
LFE
SPDIF SPDIF
IO
CTRL
TAG
STATUS STATUS
ADDR DATA
PCM
LEFT
PCM LINE1 PCM Vendor Vendor Vendor LINE2 HSET IO
RT
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
IDT™
31
HIGH-PERFORMANCE 6-CHANNEL AC’97 2.3 CODEC WITH UNIVERSAL JACKS™
STAC9758/9759
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