ASAHI KASEI
[AK4564]
n Audio Serial Interface Format
The SDTI, SDTO, BCLK and LRCK pins are connected to an external controller. The audio data format has four modes,
MSB-first and 2’s compliment. The data format is set by the DIF1-0 bits. SDTI is latched by “• ” of BCLK. SDTO is
latched by “¯”.
When DIF1= “0” and DIF0=”1”, only BCLK=64fs is acceptable.
No.
0
1
2
3
DIF1 bit
DIF0 bit
SDTO(ADC)
MSB justified
LSB justified
MSB justified
I2S compatible
SDTI(DAC)
LSB justified
LSB justified
MSB justified
I2S compatible
BCLK
Figure
Figure 8
Figure 9
Figure 10
Figure 11
RESET
0
0
1
1
0
1
0
1
³ 32fs
= 64fs
³ 32fs
³ 32fs
Table 1. Audio Data Format
LRCK
0
1
2
8
9
10 11
12
13 14
15
0
1
2
8
9
10 11
12
13 14
15
0
1
3
3
BCLK(32fs)
SDTO(o)
SDTI(i)
15 14
8
7
2
6
1
5
4
3
2
1
0
15 14
8
1
7
2
6
1
5
4
3
2
1
0
15
15
13
13
0
1
2
3
14
15 16
17
18
31
0
1
2
3
14
15 16
17
18
31
0
1
BCLK(64fs)
SDTO(o)
15 14 13 13
0
15 14 13
0
15 14
1
0
15 14
1
0
Don’t Care
Don’t Care
Rch Data
SDTI(i)
15:MSB, 0:LSB
Lch Data
Figure 8. Audio Data Timing (No.0)
LRCK
0
1
2
15
16
17 18
19
20
31
0
1
2
15
16
17 18
19
20
31
0
1
BCLK(64fs)
SDTO(o)
15
15 14 13 12
4
1
1
0
0
15
15 14 13 12
15 14 13 12
1
1
0
15
15 14 13 12
Lch Data
Figure 9. Audio Data Timing (No.1)
0
Don’t Care
15:MSB, 0:LSB
Don’t Care
SDTI(i)
Rch Data
MS0140-E-01
2002/07
- 15 -
AKM [ ASAHI KASEI MICROSYSTEMS ]
