Quartus中出现错误: Can't place multiple pins assigned to pin location Pin_101 (IOPAD_X53_Y21_N14)

简介: Quartus中出现错误: Can't place multiple pins assigned to pin location Pin_101 (IOPAD_X53_Y21_N14)

在编译工程时出现Error (176310): Can't place multiple pins assigned to pin location Pin_101 (IOPAD_X53_Y21_N14)

可以从提示中看出是一个引脚复用的原因

但是在原工程中只是将PIN_101作为普通IO引脚分配给模块使用。

查到关于nCEO的定义:

大意是說,每顆FPGA都有nCE與nCEO兩根pin,在多顆FPGA的系統中,第一顆FPGA的nCE接GND,而第一顆FPGA的nCEO將接到下一顆FPGA的nCE,如此這樣繼續接下去,而在最後一顆FPGA時,可以將nCEO floating或者當成普通I/O pin使用。而在單顆FPGA時,nCE直接接GND,nCEO可直接floating或者當普通I/O pin使用。

所以在单颗FPGA上可以将nCEO的引脚分配为普通IO引脚使用,但是这一般是在其他引脚不够用的前提下。

具体设置过程:

assignments>device>device and pin options>dual-purpose pins里面把nCEO设置成use as regular i/o就可以了

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