Memory Safety Monitor for In-Field Fault Verification
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Solution Overview
Problem
Existing memory devices lack effective mechanisms to confirm the functionality of safety mechanisms, which are not immune to faults, potentially affecting their ability to detect and alert hosts of failures, especially in critical systems like automotive systems with stringent safety standards.
Innovation Solution
Implementing a safety mechanism monitor and alert system that intermittently checks the functionality of safety mechanisms by forcing controlled failures and assessing the response, using firmware and hardware to ensure reliable operation, particularly during key off events.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If safety mechanisms are implemented in memory devices, then the ability to detect and alert hosts of failures is improved, but the device complexity increases
Solution Approach 1:
The patent implements a safety mechanism monitor that is nested within the memory device structure, which in turn is nested within the host system. This nested architecture allows the safety monitor to independently verify safety mechanism functionality without adding external complexity to the overall system.
Solution Approach 2:
The safety mechanism monitor performs self-verification by forcing controlled failures and assessing its own response. This self-service approach allows the safety monitor to confirm its own functionality without requiring external testing equipment or complex external verification systems.
2Reliability
If in-field monitoring of safety mechanisms is implemented, then the reliability of safety detection is improved, but the loss of time during monitoring operations increases
Solution Approach 1:
The patent implements periodic monitoring of safety mechanisms through the safety mechanism monitor, which intermittently forces controlled failures and assesses responses. This periodic action provides reliable in-field verification without requiring continuous monitoring that would consume excessive time and resources.
Solution Approach 2:
The safety mechanism monitor performs preliminary verification by forcing controlled failures before actual operational failures can occur. This preliminary action ensures safety mechanisms are functional and ready to detect real failures, reducing the time needed for post-failure analysis.
3Measurement precision
If controlled failures are forced to test safety mechanisms, then the measurement precision of safety mechanism response is improved, but the object-generated harmful factors increase
Solution Approach 1:
The patent converts the potentially harmful effect of forcing failures into a beneficial testing mechanism. By deliberately inducing controlled failures, the safety mechanism monitor can precisely measure and verify safety mechanism responses, transforming a harmful action into a useful verification process.
Solution Approach 2:
The safety mechanism monitor acts as an intermediary between the controlled failures and the host system. It isolates the harmful effects of controlled failures from the host by capturing and analyzing them internally, preventing direct transmission of failure effects to the host while still enabling precise measurement of safety responses.
Data Source
AI summary
A memory device may comprise a memory controller configured for controlling access to an array of memory cells. The memory controller may be configured to perform one or more memory device functions that enable the host to perform system operations. The memory controller may include at least one safety mechanism and at least one safety mechanism monitor. The safety mechanism(s) may determine memory device fault condition(s) that has a potential to adversely affect performance of at least one of the one or more memory device functions. The safety mechanism monitor(s) may determine at least one safety mechanism fault condition that has a potential to adversely affect an ability of the safety mechanism(s) to determine the memory device fault condition(s). The host may assess whether the safety mechanism(s) is reliable based on the safety mechanism fault condition(s).