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DS90UB960-Q1: PDB and REFCLK timing

Part Number: DS90UB960-Q1

Hi Team,

I understand that PDB needs to come up after all the rails and REFCLK are stable, however, what would happen if PDB comes up before the clock is ready? 

The use case here is that my customer does not currently have a way to guarantee that the clock is stable before enabling PDB.

Regards, Diego