156 www.xilinx.com Embedded Tri-Mode Ethernet MAC User GuideUG074 (v2.2) February 22, 2010Chapter 6: Use Models RPinout GuidelinesXilinx recommends the following guidelines to improve design timing using the Virtex-4FPGA Embedded Tri-Mode Ethernet MAC:• If available, use dedicated global clock pins for the Ethernet MAC input clocks.• Use the column of IOBs located closest to the PowerPC processor and Ethernet MACblock.• Use the MGTs located closest to the PowerPC processor and Ethernet MAC block.www.BDTIC.com/XILINX
