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