Lnk SoundWire User Manual page 10

When the Serial Audio Interface is configure to allow both PDM input and output streams, the two
bit clocks are totally independent (frequency, phase and time of activation).
The PDM data paths have dedicated routers (one per data line) to increase the data handling
flexibility of the interface. See the ScriptBuilder suer manual for the configuration of these data
routers.
SDIn.ChA
SDIn.ChB
SDIn_Setup[0]
SDIn_Setup[1]
CH B
PDM input path
When configured to operate in PCM mode, the interface generates a nit clock and a word clock.
The word clock transition always happens on the falling edge of the bit clock. The bit clock is
Ch 1
always 64 times greater than the word clock. The data are left aligned, MSB first and each frame
channel is 32 bits long.
Ch 2
Ch 3
Ch 4
Ch 5
Ch 6
Ch 7
Ch 8
8
SoundWire Protocol Analyzer
DATA ROUTER
0
1
0
1
SoundWire
Source
Port
Control
Registers
Ch
2n
Ch Ch
2n+1
SDOn_Setup[0]
SDOn_Setup[1]
User Manual V1.0
DATA ROUTER
0
Ch
2n
1
0
2n+1
1
PDM output path
Ch 1
Ch 2
Ch 3
Ch 4
SoundWire
Sink
Ch 5
Port
Ch 6
Ch 7
Ch 8
Control
Registers
2 x BCKO
BCKO
SDOn.ChA
SDOn
(DDR)
SDOn.ChB
SDOn
(SDR)
BIT CLOCK
DATA ROUTER
DATA ROUTER
DATA ROUTER
DATA ROUTER
4
4
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P
CH
SA
SA
SDO1
SDO1
SDO2
SDO2
SDO3
SDO3
SDO4
SDO4