Datasheet

SAM9G45 [DATASHEET]
Atmel-6438O-ATARM-SAM9G45-Datasheet_08-Dec-15
1052
42.7 Functional Description
42.7.1 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
Multiplexed (TDM) scheme that divides each audio frame in 12 outgoing and 12 incoming 20-bit wide data slots.
Figure 42-3. 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 42-4. 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 42-5. 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