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W5100 is compatible with IEEE802.3 10BASE-T and 802.3u 100BASE-TX It is also integrated internally with full hardware, TCP/IP protocol stack, and Ethernet media transport layer.
(M A C) and Physical Layer (PHY). You dont have to worry about Ethernet control using the W5100.
All you need to do is simple port (socket) programming.
Features
Multiple interfaces for selection: direct bus, indirect bus and SPI bus
Support hardware TCP/IP protocol stack, support TCP, UDP, ICMP and IGMP are IPv4, ARP, PPPoE
4 separate ports
Internally integrated with 16K byte transceiver cache.
RX, TX, all / double-sided and the beneficial output of a variety of information including Colision, Link, etc.
Support automatic conversion (DMI / MDIX).
5V voltage compatible with 3.3V power supply, IO signal
Constructed with Ethernet ports, and double row 2 x 14 2.0mm pins
Compatible with the official Aduinos Ethernet library.