问：fpga底下的过孔打多了会不会有什么影响？
时间：10-02
整理：3721RD
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用2c20做了个两层板，底下打了40多个孔，会不会有什么影响呢?请教各位大侠，先谢过了。
how fast is your design? below 50MHz, not a problem, but over 50MHz, you will need to worry about SI.
Another issue you should be aware of is that if you want to put the FPGA on a daughter board and then plug the daughter board onto a mother board for FPGA reuse, it will cause signal quality issues, especially with clock signal, reset signal.
40MHZ and it's not used as a daughter board。Thanks very much！