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DP83867CR: Interface option in 100BASE-TX case

Part Number: DP83867CR

Hello team,

My customer has a question.

When DP83867CRRGZ and Ether MAC in Soc cannot link up with 1000Base-T after Auto-Negotiation, The customer thinks that DP83867CR try to do Auto-Negotiation with 100BASE-TX.
In this,  what is the interface option to  communicate between MAC and DP83867CR ?  MII or GMII?

Best Regards,
Akihisa Tamazaki