Atmel Evaluation Kit AT91SAM9M10-G45-EK AT91SAM9M10-G45-EK Data Sheet
Product codes
AT91SAM9M10-G45-EK
1007
SAM9M10 [DATASHEET]
6355F–ATARM–12-Mar-13
43.7
Functional Description
43.7.1
Protocol overview
AC-link protocol is a bidirectional, fixed clock rate, serial digital stream. AC-link handles multiple input and output
Pulse Code Modulation PCM audio streams, as well as control register accesses employing a Time Division Multi-
plexed (TDM) scheme that divides each audio frame in 12 outgoing and 12 incoming 20-bit wide data slots.
Pulse Code Modulation PCM audio streams, as well as control register accesses employing a Time Division Multi-
plexed (TDM) scheme that divides each audio frame in 12 outgoing and 12 incoming 20-bit wide data slots.
Figure 43-3.
Bidirectional AC-link Frame with Slot Assignment
Slot #
AC97FS
TAG
CMD
ADDR
CMD
DATA
0
AC97TX
(Controller Output)
AC97RX
(Codec output)
PCM
L Front
PCM
R Front
LINE 1
DAC
PCM
Center
PCM
R SURR
PCM
LFE
LINE 2
DAC
HSET
DAC
IO
CTRL
TAG
STATUS
ADDR
STATUS
DATA
PCM
LEFT
LINE 1
DAC
PCM
MIC
RSVED
RSVED
RSVED
LINE 2
ADC
HSET
ADC
IO
STATUS
1
2
3
4
5
6
7
8
9
10
11
12
PCM
L SURR
PCM
RIGHT
Table 43-4.
AC-link Output Slots Transmitted from the AC97C Controller
Slot #
Pin Description
0
TAG
1
Command Address Port
2
Command Data Port
3,4
PCM playback Left/Right Channel
5
Modem Line 1 Output Channel
6, 7, 8
PCM Center/Left Surround/Right Surround
9
PCM LFE DAC
10
Modem Line 2 Output Channel
11
Modem Handset Output Channel
12
Modem GPIO Control Channel
Table 43-5.
AC-link Input Slots Transmitted from the AC97C Controller
Slot #
Pin Description
0
TAG
1
Status Address Port
2
Status Data Port
3,4
PCM playback Left/Right Channel
5
Modem Line 1 ADC
6
Dedicated Microphone ADC
7, 8, 9
Vendor Reserved
10
Modem Line 2 ADC
11
Modem Handset Input ADC
12
Modem IO Status