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DS90UB940-Q1: Access protection feature

Part Number: DS90UB940-Q1

Hello Team,

As you know, Master device can access DES through SER and vise versa.

My customer is asking if 941 and 940 has access protection feature to prevent to access each other.

I understand this access protection feature is on FPD4 device but FPD3 device isn't. 

Is my understanding correct??

Thank you.