Specifications:
3.3 V power supply pin.
SPI Interface with Clock Speeds Up to 20 MHz
The board 25MHZ crystal
Fully Compatible with 10/100/1000Base-T Networks
Integrated MAC and 10Base-T PHY
Supports One 10Base-T Port with Automatic Polarity Detection and Correction
Supports Full and Half-Duplex modes
Programmable Automatic Retransmit on Collision
SPI Interface with Clock Speeds Up to 20 MHz
For Arduino, SPI, AVR, PIC, LPC, STM32.