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DS90UH927Q-Q1: 927+928 I2S signal transmission failed

Part Number: DS90UH927Q-Q1

HI,my application is as below picture.We just only want to use 927 and 928 to transmit i2s signals without any video data .So we shorted the Rx pins of 927 and Tx pins of 928.Now lock pin of 928 is high but pass pin  of 928 is low. And the I2S Locked status (register 0x1C of 928) is 1.But the MCLK and I2S pins of 928 have no signal.Could you help me to find out the couse?