Memory Controller Error Correction Using Dual Check Codes
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Solution Overview
Problem
Current memory systems struggle with effective error correction for multi-bit data errors due to limited storage space constraints, as existing check codes are primarily designed for single-bit errors and cannot efficiently handle larger data errors.
Innovation Solution
Implement a dual-check code system where a first check code is stored in memory and a second check code is stored in secondary storage, allowing for flexible error correction by using both codes sequentially to enhance data integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a larger amount of check code is stored in the memory, then the error correction capability is improved, but the storage space occupancy increases
Solution Approach 1:
The check code is segmented into two parts: a first check code stored in the memory with the data, and a second check code stored in the secondary storage. This segmentation allows the memory to maintain only essential check code for single-bit error correction, while the secondary storage holds additional check code for multi-bit error correction, thus resolving the contradiction between error correction capability and storage space occupancy.
2Reliability
If the check code is used to perform error correction on multi-bit error data, then the error correction capability is improved, but the current check code structure cannot achieve this
Solution Approach 1:
The error correction system dynamically adapts its operation mode based on the type of error detected. When single-bit errors are detected, the system uses only the first check code for correction. When multi-bit errors are detected and the first check code fails to correct them, the system dynamically switches to using the second check code from secondary storage, thus achieving adaptability to different error types.
3Productivity
If the memory controller performs error correction using only the first check code, then the operation speed is improved, but the error correction capability is limited to single-bit errors
Solution Approach 1:
The system implements partial error correction using the first check code for common single-bit errors, which covers the majority of error cases and maintains high operation speed. For the less common multi-bit error cases, the system performs excessive action by retrieving and using the second check code from secondary storage, thus achieving both speed optimization and comprehensive error correction capability.
Data Source
AI summary
When a memory controller reads target data in a memory, the memory controller reads the target data and first check code of the target data from the memory. The memory controller checks the target data using the first check code. If the check fails, it indicates that error data exists in the target data. The memory controller then performs error correction on the target data using the first check code. After failing to perform error correction on the target data using the first check code in the memory, the memory controller performs error correction on the target data using the second check code in the secondary storage.