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SigXplorer中两种Buffer Delays 模式详解
发布日期：2009-3-6 22:52:43 文章来源：搜电 浏览次数： [pic]63
[pic][pic][pic] In SigXplorer, Buffer Delays Specifies how the simulator
obtains buffer delays for the simulation. We can select one of the
following options from the drop-down list:
• From Library: Specifies that the simulator obtain buffer delays
stored with the model in the library. This is the default.
• On-the-fly: Specifies that the simulator measure buffer delays during
circuit simulation and use these delays in the remaining
calculations.
[pic]
图1 Buffer Delay默认模式为From Library
那么，在时序仿真过程中，究竟该怎样设置这项参数？这两种模式有什么区别和联系呢
？让我们看看下面的仿真实例。
图2和图3分别显示了Buffer Delay模式设为From Library和On-the-fly时Switch
Delay和Settle Delay的仿真数值。以Switch
Delay为例，从这两个仿真图中可以看出二者的数值相差很大，差值为ns级别。通过
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