AK4589_1 Datasheet, PDF (55/76 Pages) Asahi Kasei Microsystems – 2/8-Channel Audio CODEC with DIR

ASAHI KASEI
[AK4589]
Audio Serial Interface Format
The DIF0, DIF1 and DIF2 pins can select eight serial data formats as shown in Table 29. In all formats the serial data is
MSB-first, 2's complement format. The SDTO2 is clocked out on the falling edge of BICK2 and the DAUX2 is latched
on the rising edge of BICK2. BICK2 outputs 64fs clock in Mode 0-5. Mode 6-7 are Slave Modes, and BICK2 is available
up to 128fs at fs=48kHz. In the format equal or less than 20bit (Mode0-2), LSBs in sub-frame are truncated. In Mode 3-7,
the last 4LSBs are auxiliary data (see Figure 32).
When using Master mode, BICK2 and KRCK2 output pins are Hi-Z during PDN pin = “L” and from PDN pin =
“H” to entering Master mode.
When the Parity Error, Biphase Error or Frame Length Error occurs in a sub-frame, AK4589 continues to output the last
normal sub-frame data from SDTO2 repeatedly until the error is removed. When the Unlock Error occurs, AK4589
output “0” from SDTO2. In case of using DAUX2 pin, the data is transformed and output from SDTO2. DAUX2 pin is
used in Clock Operation Mode 1, 3 and unlock state of Mode 2.
The input data format to DAUX2 should be left justified except in Mode5 and 7(Table 29). In Mode5 or 7, both the input
data format of DAUX2 and output data format of SDTO2 are I²S. Mode6 and 7 are Slave Mode that is corresponding to
the Master Mode of Mode4 and 5. In salve Mode, LRCK2 and BICK2 should be fed with synchronizing to MCKO1/2.
sub-frame of IEC60958
0
34
78
preamble
Aux.
LSB
11 12
27 28 29 30 31
VUCP
MSB
MSB
LSB
23
0
AK4589 Audio Data (MSB First)
Figure 32. Bit configuration
Mode DIF2 DIF1 DIF0
DAUX2
0
0 0 0 24bit, Left justified
1
0
0
1 24bit, Left justified
2
0
1
0 24bit, Left justified
3
0
1
1 24bit, Left justified
4
1
0
0 24bit, Left justified
5
1
0
1 24bit, I²S
6
1
1
0 24bit, Left justified
7
1
1
1 24bit, I²S
SDTO2
16bit, Right justified
18bit, Right justified
20bit, Right justified
24bit, Right justified
24bit, Left justified
24bit, I²S
24bit, Left justified
24bit, I²S
LRCK2
I/O
H/L O
H/L O
H/L O
H/L O
H/L O
L/H O
H/L I
L/H I
BICK2
I/O
64fs
O
64fs
O
64fs
O
64fs
O
64fs
O
64fs
O
64-128fs I
64-128fs I
Default
Table 29. Audio data format
MS0339-E-00
- 55 -
2004/09