Memory ECC Switching for Persistent Read Error Correction
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Solution Overview
Problem
Current error correction methods in memory systems are inadequate in handling errors that persist after normal read operations and retry operations, as they often rely on general Reed-Solomon algorithms without effective mechanisms for erasure correction.
Innovation Solution
The proposed method involves a dual operation mode in memory systems, where a first mode uses general Reed-Solomon decoding and a second mode employs an erasure-loop method with a loop-buffer and loop-counter to iteratively correct errors by sequentially erasing symbols, enhancing error correction capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If general Reed-Solomon decoding is used in normal read operations, then the ease of operation is maintained, but the reliability is insufficient for persistent errors
Solution Approach 1:
The error correction process is segmented into two distinct operation modes: a first mode using general Reed-Solomon decoding for normal operations, and a second mode using erasure-loop method for persistent errors. This segmentation allows each mode to be optimized for its specific purpose without requiring the full complexity of both approaches simultaneously.
Solution Approach 2:
The system dynamically switches between two operation modes based on error correction needs. The controller determines when to transition from the first operation mode (general Reed-Solomon) to the second operation mode (erasure-loop method), allowing the system to adapt its complexity level according to the actual error conditions encountered.
2Reliability
If iterative erasure correction is implemented for persistent errors, then the reliability improves, but the loss of time increases due to multiple decoding operations
Solution Approach 1:
The system performs preliminary error correction using the first operation mode (general Reed-Solomon decoding) before attempting the more time-consuming second operation mode (erasure-loop method). This preliminary action removes many errors early, so that the iterative erasure correction only needs to handle remaining persistent errors, reducing the total time loss.
Solution Approach 2:
The system skips the iterative erasure correction process for errors that can be corrected by the faster first operation mode. By rushing through the quick correction path when sufficient, the system avoids the time penalty of multiple decoding operations unless absolutely necessary.
3Adaptability or versatility
If a dual operation mode system is implemented, then the adaptability to different error conditions improves, but the device complexity increases
Solution Approach 1:
The controller is designed with multi-functionality, capable of managing both the first operation mode (general Reed-Solomon decoding) and the second operation mode (erasure-loop method). This universal controller handles mode selection, switching, and coordination, allowing the system to adapt to different error conditions without requiring separate dedicated hardware for each mode.
Solution Approach 2:
The patent merges the two different decoding approaches (general Reed-Solomon and erasure-loop method) into a unified error correction system managed by a single controller. By combining these functions under one management structure, the system achieves adaptability to various error conditions while minimizing the complexity increase that would result from completely separate implementations.
Data Source
AI summary
An error correction method includes performing a first error correction code (ECC) decoding operation of read data outputted from a memory medium and storing the read data outputted from the memory medium into a loop-buffer, in a first operation mode, and performing a second ECC decoding operation of the read data stored in the loop-buffer in a second operation mode.