在给FPGA分配引脚时，出现错误 Error: Can't place pins assigned to pin location Pin_101 (IOPAD_X34_Y18_N21) Info: Pin /OE is assigned to pin location Pin_101 (IOPAD_X34_Y18_N21) Info: Pin ~ALTERA_nCEO~ is assigned to pin location Pin_101 (IOPAD_X34_Y18_N21)
其中ALTERA_nCEO是FPGA配置用的芯片，可以不用的，所以可能通过Assignents->Device->Device and Pin Options->Dual-Purpose Pins中设置ALTERA_nCEO为Use as regular I/O，其中Dual-Purpose Pins看起来像是不可修改的，其实呢只是个假像，只要双击它就可以出现下拉框来供你选择了。
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