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AD7779 always returns 0xFF

Category: Software
Product Number: EVAL-AD7779FMCZ

I'm programming microcontroller to control the AD7779 development kit via SPI.
I'm trying to read the register of the AD7779. However, the data in the SDO line always 0xFF whenever I sent my read request to the board.
The data in SDI and SCK line are both perfect, I have checked those line by using oscillator. So are there any configurations of the EVAL-AD7779FMCZ board that I should take to recieve the data?
I'm looking forward to seeing the reply.
Thanks for help.

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