I2S Data Transfer Issue

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Hello Everyone ,
I am novie to Teensy family. I want to configure Audio board with STM32F4 controller.
As per mentioned in SGTL datasheet , I want to verify I2S_DOUT data for that I have selected I2S_DIN as source of I2S_DOUT pin .
I2S_SELECT bitfield of CHIP_SSS_CTRL register of SGTL5000 equal to 0x1 has been selected .
I2S data from ST has been applied to TX pin of Audio board but I am not getting any data on RX pin :(
Is there anything I am missing here ?

- Pinkesh
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