at91sam9263 ATMEL Corporation, at91sam9263 Datasheet - Page 597

• Manufacturer Part Number: at91sam9263
• Description: At91 Arm Thumb Microcontrollers
• Manufacturer: ATMEL Corporation

35.6.2
Figure 35-4. Logical Channel Assignment
6249D–ATARM–20-Dec-07
(Controller Output)
(Codec output)
AC‘97 Controller Channel Organization
AC97RX
AC97FS
AC97TX
Slot #
AC97C_ICA = 0x0000_0009
AC97C_OCA = 0x0000_0209
TAG
TAG
0
The AC’97 Controller features a Codec channel and 2 logical channels; Channel A and Channel
B.
The Codec channel controls AC‘97 Codec registers, it enables write and read configuration val-
ues in order to bring the AC97 Codec to an operating state. The Codec channel always runs slot
1 and slot 2 exclusively, in both input and output directions.
Channel A and Channel B transfer data to/from AC97 codec. All audio samples and modem
data must transit by these two channels. However, Channel A is connected to PDC channels
thus making it suitable for audio streaming applications.
Each slot of the input or the output frame that belongs to this range [3 to 12] can be operated by
either Channel A or Channel B. The slot to channel assignment is configured by two registers:
The AC’97 Controller Input Channel Assignment Register (AC97C_ICA) configures the input slot
to channel assignment. The AC’97 Controller Output Channel Assignment Register
(AC97C_OCA) configures the output slot to channel assignment.
A slot can be left unassigned to a channel by the AC’97 Controller. Slots 0, 1,and 2 cannot be
assigned to Channel A or to Channel B through the AC97C_OCA and AC97C_ICA Registers.
The width of sample data, that transit via Channel A and Channel B varies and can take one of
these values; 10, 16, 18 or 20 bits.
STATUS
• AC’97 Controller Input Channel Assignment Register (AC97C_ICA)
• AC’97 Controller Output Channel Assignment Register (AC97C_OCA)
ADDR
ADDR
CMD
Codec Channel
1
Codec Channel
STATUS
DATA
DATA
CMD
2
3
L Front
LEFT
PCM
PCM
Channel A
Channel A
R Front
RIGHT
4
PCM
PCM
LINE 1
LINE 1
5
DAC
DAC
6
Center
PCM
PCM
MIC
AT91SAM9263 Preliminary
L SURR
RSVED
7
PCM
R SURR
RSVED
PCM
8
RSVED
PCM
9
LFE
LINE 2
LINE 2
10
ADC
DAC
11
HSET
HSET
ADC
DAC
STATUS
12
CTRL
IO
IO
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