AK7735EQ Datasheet, PDF (60/142 Pages) Asahi Kasei Microsystems – Dual DSP with 4chADC + 4chDAC + 4chSRC

[AK7735]
5-3-2. TDM Mode
AK7735 supports TDM mode. BICK clock for data input/output should be set to 128fs, 192fs or 256fs
when using TDM mode. Sampling frequency up to 192kHz in 128fs mode (max. fs=128kHz in 192 mode,
max. fs=96kHz in 256 mode) is supported.
The SDINx input pins of the AK7735 support TDM mode. Eight slots data input is available at a
maximum. A source address is assigned to each 2 slot of SDINx input pins when using TDM mode.
(Table 19). DISLx[1:0] bits control input data slot length of the SDINx pin. DIDLx [1:0] bits control the
input data word length of the SDINx pin. The slot data format is set by DILSBEx bit.
In TDM mode, DIEDGENx bit must be set to “1” since the data transmission timing after second channel
is slot length basis. Slot length, word length and slot data format of each input data slot should be the
same setting.
The SDOUTx output pins of the AK7735 support TDM mode. Eight slots data output is available for each
pin at a maximum. Each slot data can be assigned independently by setting SELDOxA-D[5:0] bits in
every two slots. DOSLx[1:0] bits control output data slot length of the SDOUTx pin. DODLx[1:0] bits
control the output data word length of the SDOUTx pin. The slot data format is set by DOLSBEx bit. In
TDM mode, DOEDGENx bit must be set to “1” since the data transmission timing after second channel is
slot length basis. Slot length, word length and slot data format of each input data slot should be the same
setting.
Setting example of TDM mode is shown in Table 28.
Mode
0
1
2
3
4
5
Data Format
I²S Compatible
MSB Justified
LSB Justified
PCM Short Frame
PCM Long Frame
Irregular I²S
DCFx[2:0]
DILSBEx
DOLSBEx
DIEDGENx
DOEDGENx
000
0
1
101
0
1
101
1
1
110
0
1
111
0
1
000
0
1
Table 28. TDM Mode Setting Example
DISLx[1:0]
DOSLx[1:0]
11 (32bit)
11 (32bit)
11 (32bit)
Slot Length
Slot Length
Slot Length
DIDLx[1:0]
DODLx[1:0]
Word Length
Word Length
Word Length
Word Length
Word Length
Word Length
016014707-E-00
- 60 -
2016/12