Higher Tool Confidence Level (TCL) is needed for tools used on the verification of safety-critical SoCs, aiming to achieve the required Automotive Safety Integrity Level in ISO 26262. This paper presents a methodology to improve the confidence level of functional safety verification flow. To do this, we compare the fault-list generated by the fault injection (FI) simulator with the Automatic Test Pattern Generation (ATPG) flow for stuck-at (SA) fault types. Moreover, we compare fault coverage

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... sults by using test vectors generated by the ATPG tool so the result of the FI simulation is compared to the results gained from the ATPG. This is a way to improve simulator's confidence level by taking advantage of strength of the ATPG.