This is about "RGMII Ethernet"
KSZ9021RNI is a 10/100/1000Mbps Ethernet transceiver featuring programmable RGMII timing, 16KB jumbo frame support, LinkMD cable diagnostics and industrial temp...
KSZ9131RNXI is a Microchip industrial Ethernet PHY supporting 10BASE-T, 100BASE-TX and 1000BASE-T with RGMII connectivity for embedded and industrial networking...
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