使用protel 99画的一块用于fpga核心板的扩展板。适用于常见的FPGA开发核心板。具体尺寸有出入可以方便的调整。-Protel 99 paintings using a piece of board for the expansion of the core FPGA board. Applicable to common core FPGA development board. Specific size discrepancy can be easily adjusted.