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DP83TC811S-Q1: DP83TC811S-Q1 only supports 100Mbps, why does it have RGMII and SGMII interface?

Part Number: DP83TC811S-Q1

Hi Team,

       DP83TC811S-Q1 only supports 100Mbps Ethernet, why does it have RGMII and SGMII interface?  In my opinion,  RGMII and SGMII interface supports 1000Mbps Ethernet.

Do you have any suggestions?

Thanks!