ASAHI KASEI
[AK4122]
Master Mode and Slave Mode
When PORT2 and PORT3 are used as output port, the M/S2 pin and M/S3 pin select either master or slave mode. “H” is
master mode, “L” is slave mode. In master mode, MCLK should be input and the AK4122 outputs BICK and LRCK. In
slave mode, BICK and LRCK are input externally and MCLK is not needed. If PORT2 is used as input port, M/S2 pin
should be set “H” or “L”.
M/S2 pin
L
BYPS bit
0
Data I/O
I/O
Input
Output
I/O
Mode
Slave, SRC
Available
Not Available
Master, SRC
Master, Bypass
BICK, LRCK
Input
L
1
H
H
0
1
Output
I/O
Table 6. Master mode/Slave mode for PORT2
M/S3 pin
BYPS bit
Data I/O
Output
Output
Output
Output
Mode
Slave, SRC
Not Available
Master, SRC
Master, Bypass
BICK, LRCK
Input
L
L
H
H
0
1
0
1
Output
Table 7. Master mode/Slave mode for PORT3
Audio Interface Format
The audio interface should be controlled during PWN bit = “0”. When in BYPASS mode, BICK1, BICK2 and BICK are
fixed to 64fs.
(1) PORT1
Four kinds of data formats can be chosen with the DIF1-0 bits (Table 8). In all modes, the serial data is in MSB first, 2’s
compliment format. The SDTI is latched on the rising edge of BICK1. PORT1 corresponds to slave mode only.
Mode
DIF1
DIF0
Input Format
LRCK BICK
0
1
2
3
0
0
1
1
0
1
0
1
16bit, LSB justified
24bit, MSB justified
24bit, I2S Compatible
24bit, LSB justified
H/L
H/L
L/H
H/L
≥ 32fs
≥ 48fs
≥ 48fs
≥ 48fs
Default
Table 8. Audio Interface Format for PORT1
Note: The DIF1-0 bits of the PORT1 should be set a value except “10” (I2S Compatible) when the DIR is
selected as an input port.
LRCK
0
1
2
3
9 10 11 12 13 14 15 0
1
2
3
9 10 11 12 13 14 15 0 1
BICK(32fs)
SDTI(i)
15 14 13
7
6
5
4
3
2
1
0 15 14 13
7
6
5
4
3
2
2
1
0 15
0
1
2
3
17 18 19 20
31 0
1
2
3
17 18 19 20
31 0
1
BICK(64fs)
SDTI(i)
Don't Care 15 14 13 12
SDTI-15:MSB, 0:LSB
1
0
Don't Care 15 14 13 12
Rch Data
1 0
Lch Data
Figure 2. Mode 0 Timing
MS0267-E-02
2004/07
- 18 -
AKM [ ASAHI KASEI MICROSYSTEMS ]
