Quartus II Warning: Found 6 node(s) in clock paths which may be acting as ripple and/or gated clocks

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本文作者:xjtudll  发布于:2016-6-13  分类:技术心得  点击:


Quartus II编译某代码之后,老是提示如下warning:

Warning: Found 6 node(s) in clock paths which may be acting as

ripple and/or gated clocks -- node(s) analyzed as buffer(s) resulting in 
clock skew

经搜索,得到以下结论

原因:

使用了行波时钟或门控时钟。
把触发器的输出当时钟用就会报行波时钟;
将组合逻辑的输出当时钟用就会报门控时钟;

措施:

不要把触发器的输出当时钟,不要将组合逻辑的输出当时钟,如果本身如此设计,则无须理会该警告。

我的设计就是用触发器输出当时钟的,所以可忽略了该警告。

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