ASAHI KASEI
[AK4101A]
Channel 1
Channel 2
LRCK
BICK
C,U,V
Channel 1
C, U, V
Channel 2
C, U, V
Figure 7. Audio routing, DIF modes 5 and 7 (I2S)
n Audio Serial Interface
The audio serial interface is used to input audio data and consists of six pins: Bit Clock (BICK), Word Clock (LRCK) &
four Data pins (SDTI 1-4). LRCK indicates the particular channel, left or right. The DIF 2-0 pins in synchronous mode
and control registers in asynchronous mode select the particular input mode. In asynchronous mode, DIF2-0 bits are
logically ORed with DIF2-0 pins. Audio data format supports 16-24 bits, right justified and left justified modes. The I2S
mode is also supported. The AK4101A can be configured in master and slave modes.
Mode
DIF2
DIF1
DIF0
SDTI
Master / Slave
Slave
LRCK
H/L (I)
H/L (I)
H/L (I)
H/L (I)
H/L (I)
L/H (I)
BICK
0
1
2
3
4
5
6
7
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
16bit, Right justified
18bit, Right justified
20bit, Right justified
24bit, Right justified
24bit, Left justified
24bit, I2S
32fs-128fs (I)
36fs-128fs (I)
40fs-128fs (I)
48fs-128fs (I)
48fs-128fs (I)
50fs-128fs (I)
Slave
Slave
Slave
Slave
Slave
Master
Master
24bit, Left justified
H/L (O) 64fs (O)
L/H (O) 64fs (O)
24bit, I2S
Table 3. Audio Data Format Modes [NOTE; (I): Input, (O): Output]
LRCK(i)
BICK(i)
0
1
2
15
16
17
30
31
0
1
2
15
16
17
30
31
0
1
15 14
1
0
15 14
1
0
SDTI(i)
15:MSB, 0:LSB
Lch Data
Rch Data
Figure 8. Mode 0 Timing
MS0250-E-00
2003/07
- 15 -
AKM [ ASAHI KASEI MICROSYSTEMS ]
