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The KSZ9031RNX is a completely integrated triple-speed (10Base-T/100Base-TX/1000Base-T) Ethernet physical layer transceiver for transmission and reception of data on standard CAT-5 unshielded twisted pair (UTP) cable. Features • Single-chip 10/100/1000Mbps IEEE 802.3 compliant Ethernet transceiver • RGMII timing supports on-chip delay according to RGMII Version 2.0, with programming options for external delay and making adjustments and corrections to TX and RX timing paths • RGMII with 3.3V/2.5V/1.8V tolerant I/Os • Auto-negotiation to automatically select the highest link up speed (10/100/1000Mbps) and duplex (half/full) • On-chip termination resistors for the differential pairs • On-chip LDO controller to support single 3.3V supply operation – requires only one external FET to generate 1.2V for the core • Jumbo frame support up to 16KB • 125MHz reference clock output