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I'm learning about the RGMII interface of ethernet. Can anybody please tell me What IO standard does the TX and RX line of RGMII interface support? Please help. I'm just a beginner

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The two RGMII reference designs I have are both 2.5V LVCMOS. You should check the datasheet of the PHY chip you're using to confirm.

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Depends on RGMII version, but either 2.5V CMOS or 1.5V HSTL

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