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DS80PCI800: What is the turn on/off logic or mechanism of the internal termination?

Part Number: DS80PCI800

Greetings,

Our design implement DF80PCI800 as RX redriver.

Customer have a question about the internal termination.

They want to know how the IC control the ON and OFF of the termination.

Because base one the diagram of datasheet, it seems there is signal that can control the termination.

And we also measure that the input sigal will be pull high through this termination and sometimes off.

So my customer want to know the detail logic or mechanism of termination ON/OFF.

Thank you.