noise和xtalk之间有哪些不同

noise是指静态信号（恒0或恒1）被干扰而引起的毛刺；
xtalk指两个变化相反的信号相互干扰叠加引起的延时；

谢谢回复

修正一下，Xtalk对于setup来讲，考虑变化相反的影响，对于hold来讲，考虑变化相同的影响。

Xtalk（crosstalk）induced two types effects： delay and static noise.
crosstalk delay effect: crosstalk can affect signal delays by changing the times at which signal transitions occur,because of capacitive corss-coupling. this delay change maybe cause the transition to occur later or earlier, possibly contributing to a setup or hold violaion for a path.
crosstalk noise effect: due to crosstalk, a noise bump happens on cross-coupled nets, which on steady-state(0 or 1). If the bump is sufficiently large and wide, it can cause an incorrect logic value to be propagated to the next gate.