Xilinx公司 Virtex4 FPGA官方评估板的电路原理图和相应的PCB文件。是Virtex FPGA硬件电路设计的典范参考设计。其中，PCB文件是PADS格式。-Xilinx company official Virtex4 FPGA evaluation board circuit schematic diagram and the corresponding PCB document. Virtex FPGA is the hardware circuit design model for reference design. Which, PCB document format PADS.