7 Series FPGAs PCB Design Guide (UG483) - Xilinx
6 www.xilinx.com 7 Series FPGAs PCB Design Guide UG483 (v1.10) November 12, 2014 Possibility 3: I/O Signals in PCB are Stronger Than Necessary . . . . . . . . . . . . . . . . . . 41 Possibility 4: I/O Signal Return Current Traveling in Sub-Optimal ......