Switch-level bridging fault simulation in the presence of feedbacks
Peter Dahlgren · 2002
This paper investigates the degradation in detectability of bridging faults caused by situations of active feedback and logically unresolvable intermediate values under different fault modeling assumptions. A bridging fault simulator is presented that is based on a combination of switch-level modeling and levelized logic simulation. Levelized simulation is efficient for fault propagation and feedback analysis, whereas the switch-level model is used for determining whether an intermediate value is logically resolvable. A method to extract the logic function of channel graphs is presented in order to perform levelized processing of switch-level networks. The experimental results show that active feedback may reduce fault coverage by as much as 9% for stuck-at test sets and realistic bridging fault sets.