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[AK4675]
MS0963-E-00
2008/05
- 126 -
ミ
PCM I/F A & B Format
The AK4675 supports dual PCM I/F (PCM I/F A & PCM I/F B) that supports 3 kind of I/F (16bit Linear, 8bit A-Law and
8bit
μ
-Law) independently (
,
).
Mode LAWA1
LAWA0
Format
0 0 0 16bit
Linear
(default)
1 0 1
N/A
2 1 0 8bit
A-Law
3 1 1 8bit
μ
-Law
Table 101. PCM I/F A Mode
Mode LAWB1
LAWB0
Format
0 0 0 16bit
Linear
(default)
1 0 1
N/A
2 1 0 8bit
A-Law
3 1 1 8bit
μ
-Law
Table 102. PCM I/F B Mode
Four types of data formats are available and are selected by setting the FMTA1-0 and FMTB1-0 bits independently (
). In 16bit Linear mode, the serial data is MSB first, 2’s complement format. In 8bit A-Law and
μ
-Law
Mode, the serial data is MSB first. PCM I/F formats can be used in both master and slave modes. SYNCA/B and
BICKA/B are output from the AK4675 in master mode, but must be input to the AK4675 in slave mode.
Mode FMTA1 FMTA0
Format
BICKA
Figure
0
0
0
Short Frame Sync
≥
16fs2
See
(default)
1
0
1
Long Frame Sync
≥
16fs2
See
2 1 0 MSB
justified
≥
32fs2
3 1 1
I
2
S
≥
32fs2
Table 103. PCM I/F A Format
Mode FMTB1 FMTB0
Format
BICKB
Figure
0
0
0
Short Frame Sync
≥
16fs2
See
(default)
1
0
1
Long Frame Sync
≥
16fs2
See
2 1 0 MSB
justified
≥
32fs2
3 1 1
I
2
S
≥
32fs2
Table 104. PCM I/F B Format
In modes 2/ 3, the SDTOA/B is clocked out on the falling edge (“
↓
”) of BICKA/B and the SDTIA/B is latched on the
rising edge (“
↑
”).
In Modes 0 and 1, PCM I/F A timing is changed by BCKPA and MSBSA bits, and PCM I/F B timing is changed by
BCKPB and MSBSB bits.
When BCKPA bit = “0”, the SDTOA is clocked out on the rising edge (“
↑
”) of BICKA and the SDTIA is latched on the
falling edge (“
↓
”). When BCKPA bit = “1”, the SDTOA is clocked out on the falling edge (“
↓
”) of BICKA and the
SDTIA is latched on the rising edge (“
↑
”).
MSBSA bit can shift the MSB position of SDTOA and SDTIA by half period of BICKA.
When BCKPB bit = “0”, the SDTOB is clocked out on the rising edge (“
↑
”) of BICKB and the SDTIB is latched on the
falling edge (“
↓
”). When BCKPB bit = “1”, the SDTOB is clocked out on the falling edge (“
↓
”) of BICKB and the
SDTIB is latched on the rising edge (“
↑
”).
MSBSB bit can shift the MSB position of SDTOB and SDTIB by half period of BICKB.