Memory Controller Mapping for Swap Data and Cell Lifespan
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Solution Overview
Problem
The high cost of host memory, such as DRAM, and the growing demand for storage capacity necessitate the use of external memory, like SSDs, which require efficient integration and management to optimize performance and longevity.
Innovation Solution
A memory system with a memory controller that distinguishes between user data and swap data, utilizing different types of memory cells (SLC for swap data and MLC/TLC/QLC for user data) and implements a logical to physical address mapping, with cycle time monitoring to extend the lifespan of swap data storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If external memory (SSD) is used to supplement host memory capacity, then storage capacity is improved, but cost and performance optimization become problematic
Solution Approach 1:
The patent segments memory cells into two distinct types: first memory cells for user data and second memory cells for swap data. This segmentation allows differentiated management strategies, where swap data in second memory cells can be aggressively managed (moved back to host memory) while user data in first memory cells maintains persistence, thereby simplifying overall system management while achieving capacity expansion.
Solution Approach 2:
The patent applies local quality by assigning different characteristics to different memory regions. Second memory cells storing swap data are treated differently from first memory cells storing user data - specifically, swap data is subject to lifecycle management (move back to host memory after use) while user data is not. This localized differentiation optimizes both cost and performance for each data type.
2Quantity of substance
If swap data is stored in external memory, then host memory cost is reduced, but memory cell lifespan is shortened due to frequent write cycles
Solution Approach 1:
The patent divides memory cells into first memory cells (for user data) and second memory cells (for swap data). This segmentation enables selective management where second memory cells handling swap data can be monitored for cycle count and replaced or refreshed independently, protecting the overall system lifespan while maintaining cost benefits.
Solution Approach 2:
The patent implements feedback mechanisms to monitor the state of memory cells, particularly tracking write cycles and data age. This feedback enables dynamic decisions about when to move swap data back to host memory, when to refresh memory cells, and when to replace worn cells, thereby extending memory system lifespan while maintaining the cost advantages of external memory usage.
3Productivity
If different memory cell types are used for different data types, then data management efficiency is improved, but device complexity increases
Solution Approach 1:
The patent segments memory into first memory cells and second memory cells with distinct purposes. This segmentation simplifies management logic by creating clear rules: user data goes to first cells, swap data goes to second cells. The segmented approach prevents the need for complex per-cell decision-making, thereby improving data management efficiency without proportionally increasing device complexity.
Solution Approach 2:
The patent applies local quality by giving second memory cells (swap data) special management characteristics compared to first memory cells (user data). Swap data in second cells is subject to automatic eviction back to host memory and enhanced monitoring, while user data in first cells follows standard persistence rules. This localized quality differentiation improves overall data management efficiency with minimal added complexity.
Data Source
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AI summary
In certain aspects, a memory system includes a memory system, coupled to a host memory, comprising a memory device, comprising first memory cells and second memory cells; a memory controller, coupled to a host and the memory device, configured to write a first data to the first memory cells and/or a second data to the second memory cells, wherein the first data comprises user data, and the second data comprises swap data from the host memory.