Decoder Physical Position Conversion for Memory Wear Leveling
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Solution Overview
Problem
Existing semiconductor memory devices face reliability issues due to uneven wear and tear on memory cells, leading to reduced performance and lifespan, as certain memory cells are accessed more frequently than others, causing premature wear-out.
Innovation Solution
A decoder system that converts the physical position of memory cells based on an address count, switching cells from a primary memory area to a secondary area when the access count exceeds a predetermined value, thereby distributing the usage more evenly and preventing excessive access to any single memory cell.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If memory cells are accessed frequently at fixed physical positions, then access speed is improved, but reliability deteriorates due to uneven wear on memory cells
Solution Approach 1:
The patent implements dynamic address translation that changes the mapping between logical addresses and physical memory cell positions based on access frequency. When a memory cell is accessed a certain number of times, its mapping is changed to a different physical position, distributing wear across multiple cells while maintaining fast access to frequently used data through caching mechanisms.
Solution Approach 2:
The system changes the parameter of physical position mapping dynamically. By monitoring access counts and changing the physical position assignment when thresholds are reached, the system redistributes wear patterns across the memory array while preserving efficient access patterns through the translation layer.
2Reliability
If wear leveling is implemented by converting physical positions, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent introduces an address translation layer as an intermediary between the host interface and the physical memory array. This translation layer includes components such as a mapping table, access count counters, and position conversion logic that mediate between logical addresses and physical cell positions, implementing wear leveling without requiring complex modifications to the underlying memory cell structure.
Data Source
AI summary
A decoder, a memory system, and a physical position converting method thereof may detect whether an address count of an input address is equal to or greater than a predetermined value. A physical position of a semiconductor memory device corresponding to the input address may be converted if the address count is equal to or greater than the predetermined value.