Hi Wei, How are you? We think because you need to use AFE5809 's demod mode, that is the reason you will use sync word. Right? Using sync word, according to and following data sheet: First, you need to set the register correctly, before you can see the sync word on LVDS output. Sync word is used for you to recognize on LVDS output data, when you can receive the correct data (such as A.I , A.Q , B.I , B.Q or '0000'=empty) Please take a look (it also depends what kind of register you set to make M=3, or M=4, or M=5) These are helping you to read data more correctly for using AFE5809 demod mode. Thanks and best regards, Chen
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