本文详细介绍了在Quartus编译过程中遇到管脚复用错误时的解决方法，通过调整QII设置，具体到在Assignments -> Device -> Device and pin option -> Dual purpose pin中修改nCE0的设置，即可有效解决管脚复用导致的错误信息。
在Quartus编译过程中如果出现如下错误信息
Error: Can't place pins assigned to pin location Pin_E18 (IOPAD_X53_Y21_N14)
Info: Pin in_port_to_the_pio_button[6] is assigned to pin location Pin_E18 (IOPAD_X53_Y21_N14)
Info: Pin ~ALTERA_nCEO~ is assigned to pin location Pin_E18 (IOPAD_X53_Y21_N14)
是因为管脚复用导致的，按照如下设置可解决：
在QII中的Assignments----Device----Device and pin option-----(选项卡)Dual purpose pin
将nCE0的设置改为：use as regular IO
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