AK4122A Datasheet, PDF (20/54 Pages) Asahi Kasei Microsystems – 24-Bit 96kHz SRC with DIR

[AK4122A]
(2) PORT2
Four kinds of data formats are available and are selected by setting IDIF1-0 bits (Table 9). In all modes, the serial data is
in MSB first, 2’s compliment format. If PORT2 is selected as an output port, the SDTIO is clocked out on the falling edge
of BICK2, and if PORT2 is selected as an input port, the SDTIO is latched on the rising edge of BICK2. The audio
interface supports both master and slave modes. In master mode, BICK2 output is fixed to 64fs and the LRCK2 output
fixed to 1fs.
Mode
0
1
2
3
IDIF1
0
0
1
1
IDIF0
0
1
0
1
Output Format
Input Format
24bit, MSB justified 16bit, LSB justified
24bit, MSB justified 24bit, MSB justified
24bit, I²S Compatible 24bit, I²S Compatible
24bit, MSB justified 24bit, LSB justified
Table 9. Audio Interface Format for PORT2
LRCK
H/L
H/L
L/H
H/L
BICK
≥ 32fs
≥ 48fs
≥ 48fs
≥ 48fs
(default)
LRCK
0123
BICK(32fs)
SDTIO(o) ^{23 22 21}
9 10 11 12 13 14 15 0 1 2 3
15 14 13 12 11 10 9 8 23 22 21
9 10 11 12 13 14 15 0 1
15 14 13 12 11 10 9 8 23
SDTIO(i) ^{15 14 13}
0123
BICK(64fs)
SDTIO(o) ^{23 22 21}
7 6 5 4 3 2 1 0 15 14 13
17 18 19 20
31 0 1 2 3
7 6 54 3
23 22 21
7 6 5 4 3 2 1 0 15
17 18 19 20
31 0 1
7 65 4 3
23
SDTIO(i)
Don't Care 15 14 13 12
SDTIO-23:MSB, 0:LSB
SDTIO-15:MSB, 0:LSB
Lch Data
1 0 Don't Care 15 14 13 12
Rch Data
Figure 6. Mode 0 Timing
2 10
LRCK
012
BICK(64fs)
SDTIO(o) ^{23 22}
20 21 22 23 24
4 3 2 10
31 0 1 2
20 21 22 23 24
23 22
4 3 21 0
31 0 1
23
SDTIO(i)
23 22
4 3 2 1 0 Don't Care 23 22
23:MSB, 0:LSB
Lch Data
Figure 7. Mode 1 Timing
4 3 2 1 0 Don't Care 23
Rch Data
MS1076-E-01
- 20 -
2010/05