DescriptionMemory area contribution is reaching more than 80% on present day SoCs and hence its contribution at time zero and in-field becomes significant. Automotive SoCs designed for life critical applications must ( based on application) qualify Automotive safety integrity Level (ASIL)-D category as per ISO26262 standard. Rigorous functional safety checks and FMEDA (Failure Modes, Effects and Defect Analysis) is a necessary step to systematically predict the Diagnostic Coverage (DC) of all IPs used in safety critical subsystems. DC is achieved by fault injection simulations of safety block and observing the coverage by safety mechanism.
Fault injection simulation is costly affair for full custom design as SPICE simulation is involved. Traditionally, fault injection required hacking of netlist. As memory netlists are hierarchical with high repeatability, injecting a short-circuit or open-circuit fault on an instance in a sub-circuit block needed lot of effort to avoid injection of multiple faults but inject a single fault as desired. In this paper we have used TestMAX CustomFault to perform SPICE level fault injection simulation. We demonstrate that this tool gives ~10X productivity gain and higher accuracy of DC with respect to the traditional approach.