• EVENT
A CHANGE ON COMPONENT OUTPUT THAT WILL BE PROPAGATED
• TRANSACTION
A CHANGE ON COMPONENT INPUT THAT DOES NOT PROPAGATE
• SCHEDULING
FUTURE EVENTS GENERATED BY EVALUATION OF A PROCESS
• EVALUATION
CALCULATING THE OUTPUTS OF COMPONENTS BASED ON INPUTS AND CURRENT STATE
Simulation executes as follows:
At t=0 , all gate outputs are set to an unknown value
Two queues are set up
When Simulation time is incremented :
• Signal is updated.
• All processes sensitive to that signal are placed on the process execution queue.
• Each resumed process is executed until it suspends.
• Effects of the logic changes that have occurred as a result of process execution are evaluated.
• Simulation time is set to the next event in queue or halted if simulation time gets exhausted.
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