3.3 V power supply, IO is compatible with 5 V voltage signal A variety of interface can choose: direct bus, indirect bus and the SPI bus., Support hardware TCP/IP protocol stack, supports TCP, UDP, ICMP and IGMP, IPv4, ARP, PPPoE. Internal integration 16 kbyte transceiver cache Indicate the output, a variety of information including RX and TX, Full/Duplex, Colision, Link, Speed Support automatic polar transformation (DMI/MDIX)