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DS90UB947-Q1: DS90UB947-Q1 / DS90UB948-Q1 Serializer/Deserializer back-channel usage

Part Number: DS90UB947-Q1
Other Parts Discussed in Thread: DS90UB948-Q1

Dear Mr. or Ms. 

Please, help me to figure out that DS90UB947-Q1/DS90UB948-Q1 can be used by only using high speed lanes without back-channel. 

We are going to suggest these parts for high speed lanes only. 

Would you confirm TI chips are free not to use these back-channel such as I@C, GPIO etc. ?

Thank you.

Hoo Kim