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The System Jitter (SYSTEM_JITTER) constraint specifies the system jitter of the design. System Jitter depends on various design conditions, such as the number of flip-flops changing at one time and the number of I/Os changing.
System Jitter applies to all clocks within a design. System Jitter can be combined with the Input Jitter keyword on the Period constraint to generate the Clock Uncertainty value shown in the Timing Report.