RXSYNC is always low or high in ad9866

I am testing the ad9866.But there is a question about RXSYNC.The ad9866 is configured as:mode=high(full-duplex),config=high,PWR_DWN=low,RESET=high.The spi is configured as default value(after  S/W Reset).I receive the RX data but RXSYNC is always low or high.So what should I do?

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