Abstract

This paper describes a pseudorandom pattern generator for the random pattern test of combinational circuits. Suppose that a fractionp of the possible patterns detects some fault and the generator generates L patterns to test the circuit. Then the probability that the generator generates a pattern that tests the fault is at leastpL/(pL + 1). The only assumption is that all values of the seed of the generator are equally likely. The seed is twice as long as a single pattern. The generator is less than twice as expensive as a linear feedback shift register. Thus, it can be used in practice. More complicated generators that achieve a better bound are also discussed.

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