Memory ECC Decoder Using Status Flags for Adaptive Error Handling
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Solution Overview
Problem
Current semiconductor memory devices and controllers perform limited error correction code (ECC) decoding operations, lacking the ability to adapt based on the type of error encountered, which restricts their efficiency in data correction and detection.
Innovation Solution
A semiconductor memory device and controller system that generates a decoding status flag (DSF) to indicate the type of error, allowing for selective performance of different ECC decoding operations, including 1-bit error correction and 2-bit error detection, or 3-bit error detection, based on the flag received from an external device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a fixed ECC decoding operation is performed regardless of error type, then the decoding process is simple, but the error correction and detection efficiency is limited
Solution Approach 1:
The ECC decoder dynamically selects different decoding operations based on the error type detected by the syndrome. When a correctable error is detected, the decoder performs 1-bit correction; when an uncorrectable error is detected, it performs 3-bit detection. This dynamic adaptation resolves the contradiction by making the decoding process flexible rather than fixed, improving efficiency without requiring multiple dedicated decoder circuits.
Solution Approach 2:
The decoding operation parameters are changed based on the error type. The syndrome value determines which decoding mode to activate, effectively changing the operational parameters of the ECC decoder. This allows the system to optimize error correction performance for different error scenarios without increasing hardware complexity.
2Reliability
If different ECC decoding operations are performed based on error type, then the error correction capability is improved, but the control complexity increases
Solution Approach 1:
The syndrome generated during ECC decoding provides feedback about the error type. This feedback mechanism automatically determines the appropriate decoding operation without requiring complex external control logic. The syndrome acts as a feedback signal that directs the decoder to perform either 1-bit correction or 3-bit detection, improving reliability while keeping the control mechanism simple.
Solution Approach 2:
The ECC decoder performs self-service by automatically selecting the appropriate decoding operation based on the syndrome information. The system uses its own internal error detection capability (syndrome generation) to control its own operation mode, eliminating the need for complex external control mechanisms and improving data integrity through adaptive error handling.
3Adaptability or versatility
If only basic ECC decoding is performed, then the device complexity is low, but the adaptability to different error types is limited
Solution Approach 1:
The ECC decoder is designed with multi-functionality to handle both correctable errors (1-bit correction) and uncorrectable errors (3-bit detection) using a single decoder structure. The syndrome-based control mechanism enables this universal functionality without requiring separate dedicated decoders for each error type, thus improving adaptability while maintaining relatively simple device structure.
Data Source
AI summary
Disclosed are a semiconductor memory device, a controller, and a memory system. The semiconductor memory device includes a memory cell array including a plurality of memory cells, and an error correcting code (ECC) decoder configured to receive first data and a parity output from selected memory cells of the memory cell array. The ECC decoder generates a syndrome based on the first data and the parity, generates a decoding status flag (DSF) indicating a type of an error of the first data by the syndrome, and outputs the second data and the DSF to an external device outside of the semiconductor memory device when a read operation of the semiconductor memory device is performed.