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Problem statement: The faults in digital circuit can be classified broadly as single stuck-atfaults,&#13; multiple stuck-ay-faults, stuck-open faults, stuck-on faults, path delay faults, transient faults.&#13; Extensive research had been carried out in the field of testing of digital circuits to limit the number of&#13; input vectors. The cardinality of the test vectors proposed by many authors was quite high for large&#13; number of input variables. In this study a testable circuit with a small test set for detection and&#13; diagnosis of OR-bridging type fault in Reed-Muller canonical Exclusive-OR Sum of Products logic&#13; circuits, independent of the function for a given number of inputs had been proposed. Approach: A&#13; network structure comprising a set of Exclusive-OR gates and gates and a couple of auxiliary outputs&#13; were considered. The circuit as well as the test vectors were simulated by MATLAB coding. The faultfree&#13; and OR-bridging faults involving any two lines of control and data lines were then simulated. The&#13; outputs were represented in a compact decimal form for ease of tabulation. Two quantitative indices&#13; for comparison of results had also been discussed. Simulation and analysis for various random&#13; functions had been presented. Results: From the test results it was found that the identifiability for the&#13; set of random functions tested was more than 90% with just n + 5 test vectors compared to 2n test&#13; vectors required for conventional testing. It was also observed that even though the overall&#13; distinguishabililty factor was in the range of 45-80%, the individual set distinguishability was more&#13; than 90%. Conclusion: The proposed scheme had reduced the possibility of unidentifiable faults for&#13; the specified type of function. The location was also diagnosed through the output set. The analysis&#13; and diagnosis had been done through compact tabulation and two quantification indices

OR-Bridging Fault Identification and Diagnosis for Exclusive-OR Sum of Products Reed-Muller Canonical Circuits