quartus编译报错：Error (176310): Can‘t place multiple pins assigned to pin location Pin_F16 (IOPAD_X34_Y1

整体错误信息：

Error (176310): Can't place multiple pins assigned to pin location Pin_F16 (IOPAD_X34_Y18_N21) Info (176311): Pin VGA_VS is assigned to pin location Pin_F16 (IOPAD_X34_Y18_N21) Info (176311): Pin ~ALTERA_nCEO~ is assigned to pin location Pin_F16 (IOPAD_X34_Y18_N21)

在FPGA的原理图中看到：PIN_F16既作为模块IO引脚使用，同时也被nCEO用到。

解决方案：

在Quartus中点击Assignments—— Device——Device and Pin Options——Dual-Purpose Pins

在nCEO中选择Use as regual I/O