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DS90UB953A-Q1: MODE_DONE not set

Part Number: DS90UB953A-Q1


Dear expert,

953 MODE_DONE of 0x03 register should be 1 after bootup, right?

In my system , 953 0x03 register is 0.  However, mode pin is at 0 voltage during PDB rising as below captured pic. Is there any other possible reason can cause MODE_DONE is 0?

Do we have requirement for PDB rising time?(Cannot rise too slow?)

Great thanks