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Why can I get rid of the Unknown values (X in a probe, undetermined values in the Timing Window)?

April 26, 2017probe rid timing undetermined unknown values window

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Why can I get rid of the Unknown values (X in a probe, undetermined values in the Timing Window)?

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Some circuits with feedback will propagate unknowns indefinitely. In the real world the circuit would reach a determinate state because of the analog characteristics of real electronics. Unfortunately, LogicWorks only does digital simulations. Manual intervention is required to clear these unknowns. Select Simulator from the Tools menu, click on the Clear X button (to clear these unknowns).