Error: Can't place multiple pins assigned to pin location……解决办法

转自：http://blog.sina.cn/dpool/blog/s/blog_6f0eeb3301014pi7.html

今天用DE0做VGA实验，在分配管脚后全编译出现下面这样的错误：

Error: Can't place multiple pins assigned to pin location Pin_K22 (IOPAD_X41_Y19_N14)
Info: Pin B[0] is assigned to pin location Pin_K22 (IOPAD_X41_Y19_N14)
Info: Pin ~ALTERA_nCEO~ is assigned to pin location Pin_K22 (IOPAD_X41_Y19_N14)
原因是不能分配给多功能管脚Pin_K22 。这是由于Pin_K22 是一个多功能管脚，还有一个功能是nCEO，也是默认的功能。如果要用它当普通IO，需要提前设置一下：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。
注：这里有一篇BLOG说的很详细 http://www.cnblogs.com/oomusou/archive/2011/02/28/de2_70_dual_pin.html

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