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Quartus中分配管脚错误

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SDRAM程序编译出现问题:Error: Can't place multiple pins assigned to pin location Pin_F16 (IOPAD_X41_Y19_N14),如图示:



SDRAMA1管脚与ALTERA_nCEO冲突,其中ALTERA_nCEOFPGA配置用的芯片,可以不用的。

Quartus中按照Assignments->Device->Device and Pin Options->(双击)Dual-Purpose Pins设置ALTERA_nCEOUse as regular I/O即可。