(ADSP-SC573)About a S/PDIF (Tx)Transmitter

Hi

I am using ADSP-SC573_EZ-KIT and trying to output the audio signal input from S/PDIF RX to S/PDIF TX.
(DAI0_PIN09 -> S/PDIF RX -> ASRC0 -> SPORT0B -> SPORT3A -> S/PDIF TX -> DAI0_PIN10)
And I am troubled that there is no sound from S/PDIF TX
The signal from S/PDIF RX is sent to the DAC to hear the audio.
(DAI0_PIN09 -> S/PDIF RX -> ASRC0 -> SPORT0B -> SPORT0A -> DAI0_PIN01 -> DAC)
Therefore, there is no problem with S/PDIF RX.
Signal data was included in DMA data of SPORT3A.
I already confirmed the setting of SRU.
--------------------------
SRU(PCG0_CLKA_O,SPT3_ACLK_I);
SRU(PCG0_FSA_O,SPT3_AFS_I);
SRU(SPT3_AD0_O, SPDIF0_TX_DAT_I);
SRU(HIGH,DAI0_PBEN10_I);
SRU(SPDIF0_TX_O, DAI0_PB10_I);
SRU(PCG0_CLKB_O,SPDIF0_TX_HFCLK_I);  // 12.288MHz
SRU(PCG0_CLKA_O,SPDIF0_TX_CLK_I);
SRU(PCG0_FSA_O,SPDIF0_TX_FS_I);
--------------------------
I think there is no problem.
The settings for TX_CTL and RX_CTL are as follows.
TX_CTL.EN = 1
TX_CTL.SMODEIN = 1(I2S)
TX_CTL.AUTO = 1
TX_CTL.VALIDL = 1(Automatically start block transfer)
TX_CTL.VALIDR = 1
RX_CTL.EN = 1
RX_CTL.RSTRTAUDIO = 1(Automatically restart audio)
What should I check to solve the current trouble?
Best regards.
mountain999