This answer record identifies starting points when debugging simulation related issues to the Virtex-4/Virtex-5/Virtex-6 FPGA Embedded Tri-Mode Ethernet MAC.
Note: This Answer Record is a part of the Ethernet IP Solution Center
(Xilinx Answer 38279).The Xilinx Solution Center for Ethernet IP is available to address all questions related to Ethernet IP. Whether you are starting a new design with Ethernet IP cores or troubleshooting a problem, use the Solution Center for Ethernet IP to guide you to the right information.