Atmel Evaluation Kit AT91SAM9M10-G45-EK AT91SAM9M10-G45-EK データシート
製品コード
AT91SAM9M10-G45-EK
1009
SAM9M10 [DATASHEET]
6355F–ATARM–12-Mar-13
43.7.3
AC97 Controller Channel Organization
The AC97 Controller features a Codec channel and 2 logical channels: Channel A, Channel B.
The Codec channel controls AC97 Codec registers, it enables write and read configuration values 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.
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, Channel B transfer data to/from AC97 codec. All audio samples and modem data must transit by these
2 channels. However, Channels A and B are connected to PDC channels thus making it suitable for audio
streaming applications.
2 channels. However, Channels A and B are 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 Channel A or
Channel B . The slot to channel assignment is configured by two registers:
Channel B . The slot to channel assignment is configured by two registers:
• AC97 Controller Input Channel Assignment Register (AC97C_ICA)
• AC97 Controller Output Channel Assignment Register (AC97C_OCA)
The AC97 Controller Input Channel Assignment Register (AC97C_ICA) configures the input slot to channel assign-
ment. The AC97 Controller Output Channel Assignment Register (AC97C_OCA) configures the output slot to
channel assignment.
ment. The AC97 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 AC97 Controller. Slots 0, 1,and 2 cannot be assigned to Channel
A or to Channel Bthrough the AC97C_OCA and AC97C_ICA Registers.
A or to Channel Bthrough the AC97C_OCA and AC97C_ICA Registers.
The width of sample data, that transit via the Channel varies and can take one of these values; 10, 16, 18 or 20
bits.
bits.
Figure 43-4.
Logical Channel Assignment
Slot #
AC97FS
TAG
CMD
DATA
0
AC97TX
(Controller Output)
AC97RX
(Codec output)
PCM
L Front
PCM
R Front
LINE 1
DAC
PCM
Center
PCM
L SURR
PCM
R SURR
PCM
LFE
LINE 2
DAC
HSET
DAC
IO
CTRL
TAG
STATUS
ADDR
STATUS
DATA
PCM
LEFT
PCM
RIGHT
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
Codec Channel
Channel A
Codec Channel
Channel A
AC97C_OCA = 0x0000_0209
AC97C_ICA = 0x0000_0009
CMD
ADDR