Error Read Flow Component for Memory Subsystem Reliability
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Solution Overview
Problem
Conventional memory sub-systems face challenges in efficiently performing read recovery operations, particularly in identifying successful stages and correcting errors, which hampers operational reliability and debugging efficiency due to the increase in erroneous bits as data storage size grows.
Innovation Solution
The introduction of an error read flow component within the memory sub-system that increments counters for successful read recovery operations, allowing for detailed tracking of successful stages and enabling efficient debugging by managing read recovery operations based on managed units (MUs) rather than discrete memory cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional memory sub-systems perform read recovery operations on discrete memory cells, then error detection capability is maintained, but debugging efficiency deteriorates and operational reliability decreases due to inability to track successful recovery stages
Solution Approach 1:
The patent segments the read recovery process into distinct stages (e.g., initial read, first retry, second retry, etc.) and introduces stage indicators to track which stage successfully recovered each managed unit. This segmentation allows the system to maintain reliable error detection while improving debugging efficiency by identifying exactly which recovery stage succeeded, eliminating the need to analyze all stages manually.
Solution Approach 2:
The patent implements feedback mechanisms through counters and stage indicators that record and report the outcome of each read recovery operation at each stage. The counter increments when a managed unit is successfully recovered, and the stage indicator specifies which stage achieved recovery. This feedback system provides operational reliability through accurate tracking while enabling efficient debugging by providing clear performance data.
2Quantity of substance
If memory sub-systems increase data storage size, then storage capacity is improved, but error rate increases leading to decreased operational reliability
Solution Approach 1:
The patent manages large storage capacities by dividing data into managed units and tracking each unit's recovery status independently through counters and stage indicators. This segmentation approach allows the system to handle increased data storage size while maintaining operational reliability by providing granular control and tracking of error recovery at the managed unit level rather than treating storage as a monolithic system.
Solution Approach 2:
The counter and stage indicator provide continuous feedback on the state of data integrity across the storage system. As data storage size increases and error rates rise, this feedback mechanism allows the system to monitor recovery success rates and identify patterns, maintaining operational reliability through informed error management decisions.
3Ease of operation
If detailed tracking of read recovery operations is implemented, then debugging efficiency is improved, but device complexity increases due to additional counters and stage indicators
Solution Approach 1:
The patent segments the tracking function into separate, simple components: a counter that increments on successful recovery and a stage indicator that records the recovery stage. This segmentation keeps each component simple while collectively providing detailed debugging information, balancing debugging efficiency improvements with acceptable device complexity.
Solution Approach 2:
The counter and stage indicator act as intermediaries between the complex read recovery process and the debugging function. They simplify the interface by providing aggregated, easy-to-read metrics (counter value and stage number) that convey detailed recovery information without requiring complex analysis, thus improving debugging efficiency while adding minimal complexity.
4Difficulty of detecting and measuring
If conventional systems attempt debug operations for all unsuccessful read recovery cases, then debugging thoroughness is improved, but processing resources are wasted on cases that may not require debugging
Solution Approach 1:
The patent segments the debugging process by using stage indicators to identify which read recovery stages failed for each managed unit. This segmentation allows the system to apply debugging selectively based on the specific failure pattern, improving debugging thoroughness by focusing on relevant cases while conserving processing resources by avoiding unnecessary debugging of cases that recovered successfully or have known failure modes.
Solution Approach 2:
Rather than applying debugging to all unsuccessful cases (excessive action), the patent uses the counter and stage indicator information to apply debugging only where necessary (partial action). This selective approach maintains debugging thoroughness for critical cases while reducing processing resource consumption by omitting unnecessary debugging operations.
Data Source
AI summary
An apparatus includes an error read flow component resident on a memory sub-system. The error read flow component can cause performance of a plurality of read recovery operations on a group of memory cells that are programmed or read together, or both. The error read flow component can determine whether a particular read recovery operation invoking the group of memory cells was successful. The error read flow component can further cause a counter corresponding to each of the plurality of read recovery operations to be incremented in response to a determination that the particular read recovery operation invoking the group of memory cells was successful.