请教Quartus编译错误(16线/4线优先编码器) Warning: Primitive
1.我先编写了一个8线/4线优先编码器vhdl代码，编译和仿真都没有问题2.现在想用两个8线/4线 串成16线/4线优先编码器，我创建了8线/4线编码器的符号ls148，供下面的电路图引用
http://cache.amobbs.com/bbs_upload782111/files_29/ourdev_553512.JPG
(原文件名:16_4优先编码器电路图.JPG)
3.电路编译时，报下面的错误提示：
Info: Elaborating entity "coder164" for the top level hierarchy
Warning: Primitive "NOT" of instance "inst2" not used
Warning: Primitive "NAND2" of instance "inst7" not used
Warning: Primitive "NAND2" of instance "inst8" not used
Warning: Primitive "NAND2" of instance "inst9" not used
Info: Elaborating entity "ls148" for hierarchy "ls148:inst"
Warning (10631): VHDL Process Statement warning at ls148.vhd(14): inferring latch(es) for signal or variable "a", which holds its previous value in one or more paths through the process
Info (10041): Inferred latch for "a" at ls148.vhd(14)
Info (10041): Inferred latch for "a" at ls148.vhd(14)
Info (10041): Inferred latch for "a" at ls148.vhd(14)
Error: Can't synthesize current design -- Top partition does not contain any logic
Error: Quartus II Analysis & Synthesis was unsuccessful. 1 error, 5 warnings
Error: Peak virtual memory: 182 megabytes
Error: Processing ended: Wed May 12 21:00:08 2010
Error: Elapsed time: 00:00:05
Error: Total CPU time (on all processors): 00:00:05
工程文件：
点击此处下载 ourdev_553513.rar(文件大小:57K) (原文件名:coder164.rar)
谢谢各位~~ 点击此处下载 ourdev_553516.rar(文件大小:270K) (原文件名:coder164.rar)
http://cache.amobbs.com/bbs_upload782111/files_29/ourdev_553517.jpg
(原文件名:2.jpg) 啊，我忘得一干二净了。 :)
谢谢~~ 回复【2楼】hzzini
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不谢，好好看书……
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