Memory Controller ECC Feedback for Uncorrectable Error Prediction
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Solution Overview
Problem
Current memory devices face inefficiencies in error correction, particularly in predicting and managing uncorrectable errors, which can lead to data loss and system instability.
Innovation Solution
A memory controller and system that incorporates an error correction code (ECC) engine and an error managing circuit to accumulate syndromes from read operations, compare them with error patterns, and predict uncorrectable errors, thereby determining an error management policy to inhibit their occurrence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional ECC correction is used, then correctable errors are handled, but uncorrectable errors cannot be predicted and lead to data loss
Solution Approach 1:
The patent performs preliminary actions by accumulating syndromes from multiple read operations and comparing them against error patterns before uncorrectable errors occur. The error management circuit proactively identifies deteriorating memory regions by detecting repeated correctable errors, allowing the system to take preventive measures such as remapping or data migration before catastrophic failure happens.
Solution Approach 2:
The patent implements feedback mechanisms where the error management circuit continuously monitors syndromes from ECC operations, compares accumulated error patterns against threshold criteria, and dynamically adjusts error management policies. This closed-loop feedback enables the system to adapt to changing memory conditions and improve reliability over time by learning from observed error patterns.
2Reliability
If syndrome accumulation and error pattern comparison are implemented, then uncorrectable error prediction improves, but device complexity increases
Solution Approach 1:
The error management circuit performs multiple functions within a single integrated structure: it accumulates syndromes from ECC operations, compares accumulated patterns against stored error patterns, determines whether uncorrectable errors have occurred, and manages error correction policies. This multi-functional design avoids the need for separate dedicated circuits for each function, thereby reducing overall device complexity while maintaining comprehensive error prediction capability.
Data Source
AI summary
A memory controller includes an error correction code (ECC) engine and an error managing circuit. The ECC engine is configured to, during a read operation, perform an ECC decoding on a read codeword set to generate a first and second syndrome associated with a correctable error in a user data set included in the read codeword set, correct the correctable error based on the first syndrome and the second syndrome, and provide the second syndrome to the error managing circuit. The error managing circuit is configured to accumulate second syndromes associated with a plurality of correctable errors and obtained through a plurality of read operations as a plurality of second syndromes, store the plurality of second syndromes, compare the plurality of second syndromes with an error pattern set, and predict an occurrence of an uncorrectable error associated with the correctable error in a memory region based on the comparison.