ASAHI KASEI
(3) PORT3
[AK4122]
Two kinds of data formats can be chosen with the ODIF bit (Table 10). In both modes, the serial data is in MSB first, 2’s
compliment format. The SDTO is clocked out on the falling edge of BICK. The audio interface supports both master and
slave modes. In master mode, BICK and LRCK are output with the BICK frequency fixed to 64fs and the LRCK
frequency fixed to 1fs.
Mode ODIF
Output Format
LRCK BICK
Default
0
1
0
1
24bit, MSB justified
24bit, I2S Compatible
H/L
L/H
≥ 48fs
≥ 48fs
Table 10. Audio Interface Format for PORT3
LRCK
0
1
2
3
17 18 19 20
31 0
1
2
3
17 18 19 20
31 0 1
BICK(64fs)
SDTO(o)
23 22 21
7
6
5
4
3
23 22 21
7
6
5
4
3
23
SDTO-23:MSB, 0:LSB
Lch Data
Rch Data
Figure 10. Mode 0 Timing
LRCK
0
1
2
3
21 22 23 24 25
0
1
2
21 22 23 24 25
0 1
BICK(64fs)
SDTO(o)
23 22
4
3
2
1
0
23 22
4 3 2 1 0
23:MSB, 0:LSB
Lch Data
Rch Data
Figure 11. Mode 1 Timing
MS0267-E-02
2004/07
- 21 -
AKM [ ASAHI KASEI MICROSYSTEMS ]
