Abstract
This paper deals with fault diagnostics in signature analysis of computer hardware testing. When an incorrect signature is observed, it is often desired to identify the bit locations, within the input data stream, where errors have caused the faulty signature. One method is common use in the exhaustive matching test in which all bit locations of the input sequence are compared sequentially with the expected response. In this paper, an algorithm of fault diagnostics is presented by making use of the information from the faulty signature. The idea is to search the likely error locations before the tests are performed. The method reduces the number of tests required to diagnose the errors with the probability of aliasing. Such probability is always smaller than that of error detection in signature analysis. When matching tests are difficult or impossible, the method provides an estimate of where errors might have occurred that caused the incorrect signature. Also, the case of “don't cares” at the input sequence of signature analysis is discussed.
Published Version
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