It depends on which FPGA you want to use.
On Xilinx site you can find the schematics
of the Virtex-II pro ML-300 eval board, the one with the touch pad lcd screen.
It has a 10/100 eth interface, among tons of
other interfaces. But that board is quite complicated.
Here is the link:
https://www.xilinx.com/products/boards/ml300/index.htm
(on the links on the right of that page you can download schematics, gerber plots,
assembly drawings etc...)
Greets,
sgrudu.