A Bridging Fault Model for Line Coverage in the Presence of Undetected Transition Faults

Irith Pomeranz
School of Electrical and Computer Engineering, Purdue University, West Lafayette, IN 47907, USA.


A variety of fault models have been defined to capture the behaviors of commonly occurring defects and ensure a high quality of testing. When several fault models are used for test generation, it is advantageous if the existence of an undetectable fault in one model does not imply that a fault in the same component but from a different model is also undetectable. This allows a test set to cover the circuit more thoroughly when additional fault models are used. This paper studies the possibility of defining such fault models by considering transition faults as the first fault model, and bridging faults as the second fault model. The bridging faults are defined to cover lines for which transition faults are not detected. A test compaction procedure is used for demonstrating the bridging fault coverage that can be achieved, and the effect on the number of tests.

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