CXL Memory Allocation for Degradation-Aware Wear Leveling
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Solution Overview
Problem
Existing memory devices and systems using Compute Express Link (CXL) lack effective mechanisms for managing memory degradation, leading to uneven wear and reduced performance and lifespan, which are not adequately addressed by current technologies.
Innovation Solution
Implementing sensors to measure degradation factors such as operating voltage, temperature, and operation count, and using control components to estimate degradation states and distribute memory usage schedules to evenly distribute degradation parameters, thereby optimizing memory allocation and wear-leveling across memory cell groups.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If memory allocation is performed without considering degradation factors, then memory access speed is maintained, but memory lifespan and reliability deteriorate due to uneven wear
Solution Approach 1:
The patent implements a feedback mechanism where sensors continuously monitor degradation factors (operation count, temperature, voltage) of memory cell groups, and the control component adjusts memory allocation decisions based on this feedback. This closed-loop system enables dynamic wear-leveling that extends memory lifespan while maintaining manageable complexity through automated decision-making.
Solution Approach 2:
The memory device performs self-diagnosis and self-management by automatically monitoring its own degradation state through integrated sensors and making autonomous allocation decisions. The control component independently manages wear-leveling without requiring external intervention, allowing the system to optimize its own reliability while simplifying overall system complexity.
2Reliability
If sensors and control components are added to monitor and manage degradation, then memory reliability is improved, but device complexity increases
Solution Approach 1:
The patent merges the degradation monitoring function directly into the memory device structure by integrating sensors and control components within the memory architecture itself. This consolidation allows the memory device to autonomously manage its own degradation, improving reliability while avoiding the complexity of external monitoring systems.
Solution Approach 2:
The control component serves multiple functions: it manages wear-leveling allocation, processes sensor data from multiple degradation sources, and makes real-time allocation decisions. This multi-functionality reduces the need for separate dedicated components, thereby improving reliability through comprehensive management while minimizing the increase in overall system complexity.
3Duration of action of stationary object
If memory cell groups are allocated based on degradation states, then wear-leveling and lifespan are extended, but memory access time increases due to additional management operations
Solution Approach 1:
The patent implements preliminary action by pre-calculating and maintaining degradation states of memory cell groups through continuous sensor monitoring. When allocation requests arrive, the control component can immediately query pre-computed degradation information and make rapid decisions without performing complex real-time analysis, thus extending lifespan while minimizing access time penalties.
Solution Approach 2:
The system dynamically changes allocation parameters based on degradation states, selecting memory cell groups with lower degradation for new allocations. By adjusting allocation decisions according to real-time degradation parameters rather than using fixed allocation schemes, the system optimizes both lifespan extension and access efficiency.
Data Source
AI summary
A Compute Express Link (CXL) memory device includes: memory cell groups configured to store data; one or more sensors configured to measure degradation factors of the memory cell groups; and a control component configured to: receive a memory allocation request from a host device connected to the CXL memory device using CXL; and perform memory allocation of the memory cell groups for the host device based on degradation states of the memory cell groups according to the degradation factors of the memory cell groups.