Generally in most user environments, the process , voltage, and the temperature (PVT) point is specified . By referring to a predefined operating condition in a specific timing library. The library operating condition provides the system with values for P, V, and T, and these then are used to calculate derating parameters and other aspects of the analysis.
However, there are situations when there are no predefined operating conditions in the user timing libraries or the pre-existing operating conditions are not consistent with the users's operating environment.
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