Memory Wear Leveling With Multiple Gap Locations
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Solution Overview
Problem
Existing memory devices face issues with uneven wear and tear of memory cells due to disproportionate access, leading to reduced lifespan and potential data loss, particularly in non-volatile memory technologies like NOR, NAND, and non-volatile RAM, where excessive accesses degrade physical cells or cause data loss in DRAM.
Innovation Solution
Implementing a wear leveling start-gap algorithm using multiple gap locations within a pool of memory cells, distributing access evenly across a larger set of cells by moving user data to different physical cells, and utilizing error correction during wear leveling to prevent uncorrectable errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single gap location is used in wear leveling, then the algorithm is simpler to implement, but the wear distribution across memory cells is less effective
Solution Approach 1:
The patent divides the single gap location into multiple gap locations (first gap location, second gap location, etc.) distributed across different sections of the memory array. This segmentation allows the wear leveling algorithm to operate in multiple sections simultaneously, improving wear distribution effectiveness while maintaining manageable algorithm complexity through systematic organization of the multiple gap locations.
2Reliability
If multiple gap locations are used in wear leveling, then wear distribution across memory cells is improved, but the algorithm complexity increases
Solution Approach 1:
The memory array is divided into multiple sections with each section having its own gap location. This segmentation approach improves wear distribution by covering more memory areas while managing complexity through modular organization where each section can be independently managed.
Solution Approach 2:
The patent implements periodic movement of multiple gap locations through their respective sections. By cycling the gap locations periodically across different memory cells, the system achieves comprehensive wear distribution while the periodic nature provides a structured, manageable algorithm that doesn't excessively increase complexity.
3Speed
If memory cells are accessed disproportionately, then data access speed may be improved for frequently accessed data, but memory cell lifespan is reduced
Solution Approach 1:
The wear leveling algorithm proactively moves data before memory cells become worn out by monitoring and redistributing access patterns. By preliminarily relocating data from frequently accessed cells to less-used cells, the system prevents premature cell failure while maintaining fast access speeds through optimized data placement.
Solution Approach 2:
The patent dynamically changes the physical location parameter of stored data based on access frequency and wear levels. By changing which physical memory cells store which logical data, the system balances access speed requirements with cell lifespan extension, allowing frequently accessed data to be quickly retrieved while distributing the wear burden across all cells.
Data Source
AI summary
Systems, methods, and apparatus for memory management operations in a memory device. In one approach, wear leveling for the memory device is performed using a start-gap algorithm. The wear leveling is implemented using multiple gap locations in a single pool. In response to a memory management command, one or more gap locations and corresponding user data are moved. After moving the user data, one or more pointers to the gap locations are updated. A start location pointer for the pool is updated each time the gap locations complete a cycle of movement in the pool.