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DS90UH928Q-Q1: lock pin different with 948 lock pin

Part Number: DS90UH928Q-Q1

Sorry to bother.

Customer has an issue about DS90UB928 lock pin.

They think 928 lock pin work isn't the same with 948 lock pin.

948 lock pin will active high after serializer receive LVDS signal, but 928 isn't. 928 lock pin only reference PDB pin.

Is it ture??

 

another question. Has any function can detect serializer receive LVDS signal???