A safety error occurs when logic or a memory cell changes state due to a physical anomaly. The system can detect these anomalies. When a safety error occurs, it is important to ensure that the system remains in a safe state. This can include any of a number of actions. Broadly, responses fall into two categories.
- Correctable Error
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A bit error is detected and corrected, usually by the hardware. The event is recorded and an interrupt is signaled.Note: The typical response is for the platform loader and manager (PLM) to report the event to the system safety software so it can be monitored and analyzed.
- Uncorrectable Error
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An error that is detected but cannot be corrected. The event is recorded and an interrupt is signaled.Note: The typical response is for the PLM to indicate that a system-level intervention is required, which might include a partial or complete system reset.