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DS90C387: question about Deskew function

Part Number: DS90C387

Hi,

I'm reviewing TI's SERDES DS90CR481VJD and DS90C387VJDX/NOPB.

From the datasheet, both of above two parts have deskew function.

Below is my question.

1. for the same deskew function, DS90CR481VJD needs DS_OPT pin, and DS90C387VJDX/NOPB has no related pin. What is difference?

2. Is there any other pin or setting for DS90C387VJDX/NOPB for enabling the same functionality as DS_OPT pin of DS90CR481VJD?

thanks,

TS