Memory Controller ECC Policy for DRAM Correctable Error Patterns
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Solution Overview
Problem
There is a need for efficient error management in memory modules, particularly in correcting and managing errors occurring in dynamic random access memory (DRAM) systems, as existing technologies lack effective mechanisms to accurately identify and address correctable errors and prevent uncorrectable errors.
Innovation Solution
A memory controller with an error correction code (ECC) engine, central processing unit (CPU), and error managing circuitry that performs ECC decoding to generate syndromes, correct errors, count error addresses, accumulate syndromes, and determine error attributes to establish an error management policy for memory regions, thereby enhancing error correction and prevention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ECC decoding is performed to correct errors in memory modules, then error correction capability is improved, but device complexity increases due to additional circuitry and processing requirements
Solution Approach 1:
The error management function is divided into two distinct circuitries: ECC engine circuitry for error correction and error managing circuitry for error analysis and policy determination. This segmentation allows each component to specialize in specific tasks, improving overall error management capability while organizing complexity into manageable modules.
Solution Approach 2:
The error managing circuitry performs preliminary analysis on syndromes and error addresses before final error correction is applied. By pre-processing error information to identify patterns and attributes, the system prepares correction strategies in advance, reducing the complexity of real-time error handling.
2Measurement precision
If error management circuitry accumulates and analyzes syndromes to determine error attributes, then error management precision is improved, but loss of time occurs due to additional processing steps
Solution Approach 1:
The error managing circuitry accumulates syndromes and analyzes error addresses in advance to determine error attributes before final correction is needed. This preliminary analysis prepares the system with pre-characterized error information, enabling faster response when errors occur without sacrificing identification accuracy.
Solution Approach 2:
The system uses accumulated syndrome data and error address patterns as feedback to improve error attribute determination. By continuously analyzing error patterns and storing syndrome information, the circuitry learns from past errors to enhance future error identification accuracy while maintaining efficient processing.
Data Source
AI summary
A memory controller to control a memory module includes an error correction code (ECC) engine, a central processing unit to control the ECC engine and an error managing circuit. The ECC engine performs an ECC decoding on a read codeword set from the memory module to generate a first syndrome and a second syndrome in a read operation, corrects correctable error in a user data set based on the first syndrome and the second syndrome and provides the error management circuit with the second syndrome associated with the correctable error. The error managing circuit counts error addresses associated with correctable errors detected through read operations, stores second syndromes associated with the correctable errors by accumulating the second syndromes, determines attribute of the correctable errors based on the counting and the accumulated second syndromes, and determine an error management policy on a memory region associated with the correctable errors.