Ethernet 10/100BASE-TX/FX MII Physical Layer Transceiver Resources Micrel KSZ8721BL 10/100BASE-TX/FX MII Physical Layer Transceiver OpenCores Ethernet 10/100 MAC Ethernet MAC Forum Test and Diagnosis Program kiloboot: 1kB TFTP Bootloader for AVR / ENC28J60 ENC28J60 Datasheet ENC28J60 Rust Driver