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CC8520: CC8520 data does not received

Part Number: CC8520

Hi

My Receiver does not received data from TX

This is my setup

Receiver

Network role : Master

Application role :Stereo output base station 

Operation : Host control

Audio Interface :  DSP, 24bit I2S with MCLK

Audio Streaming : (slave to master) Input left / right , Audio IO : AD0 

Streaming format : PCME24

Tx

Network role : Slave

Application role : Stereo input satellite

Operation : Host control 

Audio Interface :  DSP, 24bit I2S with MCLK

Audio Streaming : (slave to master) Input left / right , Audio IO : AD0 , ACH_SET_USAGE 0, 1

After link, when I check the AD0 port in Tx, I can see I2S data format, but In receiver, there is no Data, just low value.

Is there some problem? Actually, I'm using AD0 for TX and Receiver. 

And I want to use 2 mic system , So I choose Tx slave.