Staggered Scan Thresholds for Memory Error Mitigation
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Solution Overview
Problem
Memory systems, such as solid-state drives, face performance bottlenecks due to simultaneous triggering of scan and fold events across multiple groups of memory cells, leading to increased error handling overhead and reduced system performance under read-intensive workloads.
Innovation Solution
Adjusting and staggering scan event thresholds for different groups of memory cells to distribute scan and fold events in time, thereby reducing the number of simultaneous events and minimizing performance impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If scan and fold events are triggered simultaneously across multiple groups of memory cells, then error detection and correction are performed, but system performance deteriorates due to increased error handling overhead
Solution Approach 1:
The memory device is divided into multiple groups of memory cells, each with its own scan event threshold. This segmentation allows independent control of scan events for different groups, enabling the system to distribute error detection operations across time rather than executing them simultaneously, thereby reducing performance impact while maintaining comprehensive error detection.
Solution Approach 2:
Different scan event thresholds are pre-configured for different groups of memory cells based on their respective error characteristics and usage patterns. This preliminary configuration enables the controller to proactively distribute scan events in time, preventing simultaneous error handling operations that would degrade system performance.
2Ease of manufacture
If scan event thresholds are uniform across all memory cell groups, then implementation is simple, but performance bottlenecks occur during read-intensive workloads
Solution Approach 1:
Instead of using a uniform scan event threshold for all memory cell groups, the system implements group-specific thresholds tailored to local characteristics. Each group's threshold is adjusted based on its error rate, usage pattern, and operational characteristics, allowing optimized error detection timing that prevents performance bottlenecks during read-intensive workloads while maintaining manageable implementation complexity.
Data Source
AI summary
Systems and methods are disclosed, comprising a memory device comprising multiple groups of memory cells, the groups comprising a first group of memory cells and a second group of memory cells configured to store information at a same bit capacity per memory cell, and a processing device operably coupled to the memory device, the processing device configured to adjust a scan event threshold for one of the first or second groups of memory cells to a threshold less than a target scan event threshold for the first and second groups of memory cells to distribute scan events in time on the memory device.