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DS90UB940N-Q1: How to set forced single link

Part Number: DS90UB940N-Q1

Hello Team,

My customer has an inquiry for register setting which is Adrs:0x34 bit 4:3.

They wants to connect 921(Tx) to 940N(Rx) as single link.

But, the datasheet mentions there are 2 setting which are '10: Forced Mode: Single link, primary input' and '11: Forced Mode: Single link, secondary input'.

So, could you please provide what does primary and secondary input mean?

Best Regards,

Yuki