FPGA不能工作：
现象：FPGA can downloader and the Impact show “download successfully”.But the FPGA does not work even the easiest logic which a pin is assigned to high level.
Reason : Because the FPGA_DONE pin is connect a transistor. The transistor led is light.But the FPGA_DONE pin go low,which led the FPGA not to work.
So if meet this style question,first check whether the config pin is correct level.
楼主
