AK4586 Datasheet, PDF (27/54 Pages) Asahi Kasei Microsystems – MULTI CHANNEL AUDIO CODEC WITH DIR

ASAHI KASEI
[AK4586]
Audio Serial Interface Format
Eight serial data formats can be selected by the DIF2-0 bits as shown in Table 14 at the SLAVE pin “L”. If the SLAVE pin
is “H”, the AK4586 is fixed in the slave mode and two serial data format can be selected by the DIF0 bit. In all formats the
serial data is MSB-first, 2's compliment format. The SDTO is clocked out on the falling edge of BICK and the SDTI1-3
are latched on the rising edge of BICK. BICK outputs 64fs clock in Mode 0-5. Mode 6-7 are the slave mode, and BICK is
available up to 128fs at fs=48kHz. In the format equal or less than 20bit (mode 0-2), LSBs in sub-frame are truncated. In
mode 3-7, the last 4LSBs are auxiliary data (see Figure 11).
When the Parity Error or Biphase Error occurs in a sub-frame, the AK4586 continues to output the last normal sub-frame
data from SDTO repeatedly until the error is removed. When the Unlock Error occurs, the AK4586 outputs “0” from
SDTO.
Mode 4, 5, 6 and 7 in SDTI input formats can be used for 16-20bit data by zeroing the unused LSBs.
sub-frame of IEC60958
0
34
78
preamble
Aux.
LSB
11 12
27 28 29 30 31
VUCP
MSB
MSB
LSB
23
0
AK4586 Audio Data (SDTO, MSB First)
Figure 11. Bit configuration
Mode
0
1
2
3
4
5
6
7
6
7
SLAVE
0
1
DIF
210
000
001
010
011
100
101
110
111
xx0
1
SDTO
16bit, Right justified
18bit, Right justified
20bit, Right justified
24bit, Right justified
24bit, Left justified
24bit, I²S
24bit, Left justified
24bit, I²S
24bit, Left justified
24bit, I²S
SDTI1-3
16bit, Right justified
18bit, Right justified
20bit, Right justified
24bit, Right justified
24bit, Left justified
24bit, I²S
24bit, Left justified
24bit, I²S
24bit, Left justified
24bit, I²S
LRCK
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
H/L I
L/H I
BICK
I/O
64fs
O
64fs
O
64fs
O
64fs
O
64fs O
64fs O
64-128fs I
64-128fs I
64-128fs I
64-128fs I
Default
Table 14. Audio Data Format (TDM= “0”)
MS0097-E-01
- 27 -
2001/12