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DP83TG720S-Q1: SMI communication timing

Part Number: DP83TG720S-Q1

Hi Expert,

Here is one question about SMI communication timing.

As specified in datasheet, MDC to MDIO (output) delay maybe as little as 0ns. If worse case was 0, how could CPU side get the sufficient setup time?  Can it be configured through software?

The following is SMI interface timing on CPU side, as specified, 13ns is lowest request.

Thanks!

Ethan Wen