始终使用@* |意义和缺点 [英] using always@* | meaning and drawbacks

问题描述

你能说出那是什么意思吗

can you say what is the meaning of that

• 总是@ *

使用该语句后是否有任何可能的副作用?

Is there any possible side effects after using that statement ?

推荐答案

这只是列出 always 块所依赖的所有连线的快捷方式.这些电线是敏感列表".使用它的一个优点是合成代码不太可能关心你在敏感列表中放什么(除了 posedge 和 negedge)，因为电线将物理"连接一起.模拟器可能依赖于列表来选择哪些事件应该导致块执行.如果您更改模块并忘记更新列表，您的模拟可能与实际综合行为不同.

It's just a shortcut for listing all of the wires that the always block depends on. Those wires are the "sensitivity list". One advantage of using it is that synthesized code is unlikely to care what you put in the sensitivity list (other than posedge and negedge) because the wires will be "physically" connected together. A simulator might rely on the list to choose which events should cause the block to execute. If you change the block and forget to update the list your simulation might diverge from the actual synthesized behavior.

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