Control Signal Integrity Checking in Functional Safety
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Solution Overview
Problem
Existing methods for checking address and control signal integrity in high-reliability and functional safety applications are costly and inefficient, particularly in devices lacking dedicated hardware for these functions.
Innovation Solution
A method and device for checking the integrity of control signals with minimal hardware area and computational overhead, involving the generation of first control information based on original control information, obtaining original checking information, and determining the correctness of the first control information, which can be implemented in a processor and memory system to ensure accurate data access and operation execution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional data validation methods are used to check address and control signal integrity, then reliability is improved, but device complexity and hardware cost increase
Solution Approach 1:
The system uses existing control information already present in the data bus to perform self-validation of address and control signals. The control information contains embedded validation data that enables the system to check its own integrity without external assistance or additional validation hardware.
Solution Approach 2:
The control information serves multiple functions simultaneously: it controls the memory access operation and contains embedded validation information for integrity checking. This multi-functionality eliminates the need for separate validation signals or additional hardware components.
2Reliability
If dedicated hardware for address and control signal checking is added, then functional safety is improved, but manufacturing cost increases
Solution Approach 1:
The system achieves functional safety through self-validation using existing control information. No dedicated safety hardware is required because the control information itself contains the means for validation, making the system self-sufficient for safety-critical checking.
Solution Approach 2:
The control information is modified to include embedded validation parameters while maintaining its original control function. This parameter enhancement allows validation capability to be added without requiring completely new hardware structures.
3Measurement precision
If comprehensive data validation is performed on all control signals, then measurement precision is improved, but productivity decreases due to computational overhead
Solution Approach 1:
The validation process uses the control information already present in the system without requiring additional computational resources. The embedded validation data enables precise checking while maintaining normal system performance because no extra computation is needed beyond using the existing control signals.
Data Source
AI summary
The present disclosure provides a method for checking a to-be-checked signal and related products. The method is applied in a checking device and includes: a first obtaining module, configured to obtain a to-be-checked signal carrying first control information, wherein the first control information is generated based on original control information; a second obtaining module, configured to obtain original checking information; a determining module, configured to determine the first control information according to the to-be-checked signal; and a checking module, configured to check correctness of the first control information according to the original checking information. The present disclosure can be used to enable reliability and functional safety on devices originally designed without features intended to support those functions.