Selective Wordline Media Management for Memory Reliability
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Solution Overview
Problem
Conventional media management operations in memory sub-systems, such as read disturb (RD) management, cause unnecessary latency and inefficiency by performing operations across entire blocks, leading to decreased input-output per second (IOPS) and reduced performance in high-performance applications.
Innovation Solution
Perform selective media management operations by identifying and targeting only wordlines that fail to meet a reliability threshold criterion, such as a maximum raw bit error rate (RBER), and executing media management operations only on those wordlines, using a metadata table to guide the process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional media management operations are performed across entire blocks, then reliability is improved, but latency increases and IOPS decreases
Solution Approach 1:
The patent segments the block-level media management operation into wordline-level operations. Instead of managing entire blocks, the system identifies and manages only the specific wordlines that fail reliability criteria, dividing the management task into smaller, independent units that can be processed more efficiently.
Solution Approach 2:
The patent applies local quality by performing media management operations only on the specific wordlines that exhibit reliability issues rather than uniformly managing all wordlines in a block. This targeted approach applies management resources where needed while preserving performance in unaffected areas.
2Reliability
If conventional media management operations are performed across entire blocks, then reliability is improved, but productivity decreases
Solution Approach 1:
By segmenting block-level operations into wordline-level operations, the system enables parallel processing of multiple wordlines independently, increasing throughput and IOPS while maintaining reliability management for affected areas.
Solution Approach 2:
The patent performs partial action by executing media management operations only on the subset of wordlines that fail reliability criteria rather than all wordlines in the block. This reduces unnecessary operations and improves overall system productivity.
3Loss of time
If selective media management operations are performed on specific wordlines, then latency is improved and IOPS increases, but device complexity increases
Solution Approach 1:
The patent introduces a metadata table as an intermediary structure to track wordline reliability status and guide media management operations. This intermediary layer simplifies the complexity by providing a centralized repository for reliability information, eliminating the need for complex real-time analysis during management operations.
Solution Approach 2:
The system performs preliminary actions by proactively monitoring and tracking wordline reliability metrics in the metadata table before media management operations are needed. This advance preparation enables quick identification of affected wordlines when management operations are triggered, reducing latency and simplifying the execution phase.
Data Source
AI summary
A system comprising a memory device and a processing device, the processing device operatively coupled with the memory device to perform operations. The processing device detects a trigger for a media management operation associated with a block of the memory device, wherein the block comprises a plurality of wordlines (WLs). The processing device identifies a first subset of the plurality of WLs, wherein the first subset of the plurality of WLs fails to satisfy a reliability threshold criterion. The processing device performs the media management operation on a set of memory cells associated with the first subset.