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I2S transmit in slave mode

Sergey Zevelev
Prodigy 90 points

DSP C5504 is connected to external Codec  via SPI (control data) and via I2S0 – sound data. Codec is configured as  master in I2S interface and DSP – as slave. Word format is 32 bits. DSP receives all sound data from Codec, but does not transmit to codec anything.
We watch by scope pin I2S0_CLK=750kHz, pin  I2S0_FS=11.72 KHz, but DSP output I2S0_DX is low constantly. When DSP has configured as master, Sound Data is transmitted via I2S0_DX to Codec.
Why Sound data is not transmitted from DSP when it is in slave mode?
Thanks
Sergey Zevelev