[AK4129]
■ Audio Interface Format for Output PORT
The ODIF1-0 pins and OBIT1-0 pins select the audio interface format for the output port. The audio data is MSB first, 2’s
complement format. The SDTO1-3 is clocked out on the falling edge of OBICK. Select the audio interface format for
output port when the PDN pin = “L”. If the AK4129 is in slave mode at bypass mode, IBICK1 and OBICK must be
synchronized but the phase is not critical. ILRCK1 and OLRCK must be synchronized but the phase is not critical. The
audio interface format of SDTO1, SDTO2 and SDTO3 are controlled together by ODIF1-0 pins, OBIT1-0 pins and TDM
pin. Output ports become TDM mode when the TDM pin = “H”. In TDM mode, the SDTI1 pin outputs serial data for
6channels and the SDTI2-3 pins output “L”.
Mode
TDM pin ODIF1 pin ODIF0 pin
SDTO1-3 Format
LSB justified
0
1
2
3
4
5
6
7
L
L
L
L
L
H
H
L
L
H
L
H
L
Reserved
MSB justified
L
I2S Compatible
H
H
H
H
Reserved
Reserved
L
H
H
H
L
H
TDM256 mode 24bit MSB justified
TDM256 mode 24bit I2S Compatible
Table 6. Output PORT Audio Interface Format 1
OBICK Frequency
TDM
pin
Master / Slave
setting
OBIT1 OBIT0
SDTO
1-3
OLRC
K
Mode
OBICK
Input
MSB justified,
LSB
justified
pin
pin
I2S
0
1
2
3
4
5
6
7
8
L
L
H
H
L
L
H
L
H
L
16bit
18bit
20bit
24bit
16bit
18bit
20bit
24bit
≥ 32FSO
≥ 36FSO
≥ 40FSO
≥ 48FSO
Slave
(CM2-0 = “HLL”
or “HHL”)
Input
Output
Input
64FSO
L
Master
(Not CM2-0 =
“HLL”/“HHL”)
L
H
H
H
L
H
Output
Input
64FSO
TDM256
mode
24bit
Slave
(CM2-0 = “HLL”
or “HHL”)
9
*
*
*
256FSO
256FSO
10
11
12
13
14
15
H
TDM256
mode
24bit
Master
(Not CM2-0 =
“HLL”/“HHL”)
*
Output
Output
Table 7. Output PORT Audio Interface Format 2
(* The data length for 1channel is 24bit fixed in TDM mode. The OBIT1-0 pin settings are ignored. Connect these pins to
VSS2-5.)
MS1173-E-01
2010/09
- 27 -
AKM [ ASAHI KASEI MICROSYSTEMS ]
