I have the ml505 Virtex-5 based board as part of the Ethernet Kit. I have been using the Core Generator to experiment with the Embedded Tri Mode Ethernet MAC Wrapper with some success. I want to load the generated design as a project into Xilinx ISE. Basically I want to customize the design or interface it with other features of the ml505. Can someone provide methodology or advice on how to do this? For a simple example, I might want to light up LEDs depending on certain types of packets received.