【求助】关于综合选项中的“keep hierarchy”设置

如何设置ISE 9.1 i中综合选项“keep hierarchy” 好像选“YES”和“SOFT”都是保留层次结构,那两者的区别是什么呢?
谢谢
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  • timsun (2008-10-09 13:04:10)

    Soft is used when you wish to maintain the hierarchy through synthesis, but you do not wish to pass the keep_hierarchy attributes to place and route.