Abstract
An approach for assessing the impact of physical injection of transient faults on control flow behaviour is described and evaluated. The fault injection is based on two complementary methods using heavyion radiation and power supply disturbances. A total of 6,000 transient faults was injected into the target microprocessor, an MC6809E 8-bit CPU, running three different benchmark programs. In the evaluation, the control flow errors were distinguished from those that had no effect on the correct flow of control, vis. the control flow OKs. The errors that led to wrong results are separated from those that had no effect on the correct results. The errors that had no effect on either the correct flow or the correct result are specified. Three error detection techniques, namely two software-based techniques and one watchdog timer, were combined and used in the test in order to characterize the detected and undetected errors. It was found that more than 87% of all errors and 93% of the control flow errors could be detected.Key WordsExperimental EvaluationFault-InjectionTransient FaultsControl Flow CheckingError DetectionFault-ToleranceFailure Analysis
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