Automotive Semiconductors and Functional Safety
Which correctly describes FMEDA (Failure Modes, Effects and Diagnostic Analysis) performed in functional safety assessment?
- ATabulating, for each part of a circuit, the failure modes and failure rates, their effects and the proportion detectable by safety mechanisms, and calculating SPFM, LFM and other metrics
- BAnalyzing the delay of each circuit path to find the maximum clock frequency at which the chip can operate
- CCompiling the uptime and failure records of each piece of manufacturing equipment to estimate the fab's production capacity and the number of additional tools needed for mass production
Show answer and explanation
Answer: A. Tabulating, for each part of a circuit, the failure modes and failure rates, their effects and the proportion detectable by safety mechanisms, and calculating SPFM, LFM and other metrics
FMEDA is FMEA (Failure Mode and Effects Analysis) with a diagnostic perspective added. For each part, such as memory, CPU, clock and power supply, failure rates and failure modes such as stuck-at faults and malfunctions are assigned, and the analysis summarizes whether each leads to violation of a safety goal and which safety mechanisms detect how much of it. From the results, SPFM, LFM and PMHF are calculated, and safety mechanisms are added if the targets are not met. Failure rate values are derived from failure rate handbooks, test data and so on.
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