A logic circuit simulator implemented on a mini-computer with 16K core handles 1000 zero- and unit-delay gates. Single "stuck-at-0", "stuck-at-1", and "short-circuit" faults are simulated in parallel seven at a time using a table-driven selective-trace fault-injection algorithm. For a typical 100-gate circuit the simulation rate for the fault-free circuit or for a group of seven faults is about 800 input patterns per minute, and a complete fault simulation run takes about 5 minutes and costs $1.This paper, aimed at simulator program-designers rather than users, describes technical details of the implementation including minicomputer considerations, the data structure, coding three-valued-logic for efficient parallel simulation, the selective-trace algorithm, the recognition and resolution of critical races in flip-flops, the recognition and resolution of circuit oscillations, implicit fault collapsing, and short-circuit fault simulation.
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A minicomputer-based logic circuit fault simulator
Flomenhoft, Mark J.; Csencsits, Brenda M.
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, Volume 4 (3)
Association for Computing Machinery – Sep 1, 1974
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