The set_clock_uncertainty specifies a window within which a clock edge can occur. The uncertainty in the timing of the clock edge is to account for several factors such as clock period jitter and additional margins used for timing verification. Every real clock source has a finite amount of jitter - a window within which a clock edge can occur. The clock period jitter is determined by the type of clock generator utilized. In reality, there are no ideal clocks, that is, all clocks have a finite amount of jitter and the clock period jitter should be included while specifying the clock uncertainty.
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