A stimulus engine for a logic simulation system is used to interpret a stimulus language and generate test patterns as input to a logic simulator. The stimulus language allows a large test pattern set to be represented as a program. Special purpose hardware interprets this program and generates a sequence of input/output events to the logic simulator. The program interpretation is performed while the logic simulation is executing. Special purpose hardware is used to insure that the stimulus engine is able to generate the input/output events at a rate which does not slow down the logic simulator.
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