Critical Path Tracing Based Simulation of Transition Delay Faults

A new method is presented for simulating of transition delay faults (TDF). The main idea of the method is to extend the TDF model, traditionally considered as a class of robustly tested delay faults, to a class of TDFs with extended detection conditions. Three known fault classes of delay fault sensitization are considered: robust, non-robust and functional sensitization of delay faults. Additionally, a new fault class is introduced, called non-robust functionally sensitized delay fault. A novel fault analysis algorithm based on 7-valued algebra is presented, which delivers the fault coverage for all mentioned four types of TDFs.