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DS90UB903Q-Q1: why the register 0x0C's field LINK DETECT is 1 when no DES connected with the 903?

Part Number: DS90UB903Q-Q1

Hi, Team

I am using the DS90UB903 & DS90UB904  Serdes pair to transfer image, and I have a trouble:

the register 0x0C's field LINK DETECT of 903 is 1 when not connected with the 904(the cable is plug out), even when no valid input pclk detected(the PCLK DETECT is 0).

according to the datasheet, the  LINK DETECT = 1 means that the 903 has detected the presence of the 904. May be the datasheet is wrong?

Or the IC we bought is fake??

Thank you 

Best Regards