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                ## Can't place multiple pins assigned to pin location Pin\_F16 (IOPAD\_X53\_Y21\_N14) 在編譯工程時出現Error (176310): Can't place multiple pins assigned to pin location Pin\_F16 (IOPAD\_X53\_Y21\_N14)? 可以從提示中看出是一個引腳復用的原因 但是在原工程中只是將PIN\_F16作為普通IO引腳分配給模塊使用。 在FPGA的原理圖中看到 ![](https://img.kancloud.cn/a5/5f/a55f93504648875e510387dc1ddfac46_935x246.png) PIN\_F16既作為模塊IO引腳使用,同時也被nCEO用到。 查到關于nCEO的定義: ``` 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。 ``` 所以在單顆FPGA上可以將nCEO的引腳分配為普通IO引腳使用,但是這一般是在其他引腳不夠用的前提下。 **具體設置過程:** assignments>device>device and pin options>dual-purpose pins里面把nCEO設置成use as regular i/o就可以了
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