窗口是在客户端时钟和服务器时钟之间所允许的最大偏差。
The window is the maximum allowable drift between the client clock and the server clock.
时钟信号总是由设备端生成的。
这样，就在接收端所在的时钟域中造成了亚稳态。
Whenever this happens, there is a possibility of meta-stability in the receiving clock domain.
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