my purpose is to create a lan communication.

For that i have an example of echo server that i found, it works well, but now instead of echo the data back, i want to get data inside my vhdl code (inside ISE) in order to process them. i mean i want to output/input data from the top of the embeded processor (system.vhd) in order to use them in ISE.
But i don't want to output them from the FPGA, so no ucf address.

can someone help me end explain how to do that.
Thank you a lot