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Question about AN-812

Question asked by Gary@Bian on Nov 7, 2016
Latest reply on Nov 11, 2016 by Gary@Bian
i have a question about  application note AN-812. I used the circuit  in this application note to change the AD9272's  SPI registers.  but it  doesn't work.  i have some thoughts:
1. whether  the AD9272 SPI voltage level  is 1.8v , my design is on the base of  1.8v.  the problem may be that  voltage level don't match.
2.problems about registers . the register address  0xFF , Whether every time I change other registers, i must change the address 0xFF from 0x00 to 0x01.
There may be other reasons that you can tell me. I  want to know the reason. Thank you very much !