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DP83867IR: MDI 2Pair or 4Pair for RGMII

Part Number: DP83867IR

Hello Expert,

Our customer want to use DP83867IRRGZ and will draw schematic soon.

Now we have some questions.

They will use RGMII. But they will use only up to 100Mbps.

If this condition,

do they have to configure 4pairs of MDI?

Otherwise is it able to use 2pairs of MDI? also could I use LAN Transformer for 2pairs?

Could you please give your confirmation or guide to me?

Best regards,

Michael