Mapping Cache for Address Mapping Management in Data Storage
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Solution Overview
Problem
As the capacity of data storage devices increases, managing address mapping information becomes inefficient, leading to performance degradation due to the need for separate storage of this information, which complicates the management and processing of requests in memory devices like NAND flash memory.
Innovation Solution
Implementing a semiconductor device with a mapping cache that caches address mapping data and a cache controller to manage this information, utilizing a dual-cache system where each cache block stores first mapping information and links to related second mapping information, allowing for efficient storage and retrieval of address mapping data within the memory device itself.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If address mapping information is stored in a separate storage device, then the memory device can operate independently, but the overall performance degrades due to increased management complexity and data access overhead
Solution Approach 1:
The patent merges the address mapping information storage with the memory device by implementing a mapping cache within the memory device structure. This allows the memory device to store and manage its own mapping information internally, eliminating the need for separate storage devices while maintaining independent operation capability and improving overall performance through reduced data access overhead.
Solution Approach 2:
The mapping cache is nested within the memory device structure, with cache blocks containing mapping information and links to related cache blocks. This nested organization allows efficient storage and retrieval of address mapping data within the memory device itself, resolving the contradiction between independent operation and performance.
2Quantity of substance
If the capacity of the data storage device increases, then more data can be stored, but the amount of address mapping information increases causing performance degradation
Solution Approach 1:
The patent segments the address mapping information into cache blocks, where each cache block stores a portion of the mapping data along with links to related cache blocks. This segmentation allows the system to manage large amounts of mapping information efficiently, enabling increased data capacity while maintaining performance through localized access to relevant mapping data.
Solution Approach 2:
The mapping cache performs preliminary storage of address mapping information within the memory device before it is needed for operations. By pre-loading and caching mapping data, the system reduces the overhead of managing address mapping information as data capacity increases, thereby maintaining performance despite larger storage capacities.
3Productivity
If a dual-cache system with links is implemented, then mapping information can be stored efficiently within the memory device, but the device complexity increases
Solution Approach 1:
The cache blocks contain built-in links to related cache blocks, allowing the mapping cache to automatically manage and retrieve related mapping information without requiring complex external management structures. This self-service mechanism reduces device complexity by embedding the navigation and management functionality directly within the cache structure itself.
Data Source
AI summary
A data storage device includes a memory device including a normal data region and a mapping data region, the normal data region being configured to store normal data, the mapping data region being configured to store mapping data; a host request managing device configured to manage a read/write request from a host; a mapping managing device configured to cache a part of the mapping data and to manage mapping information according to a request from the host request managing device; and a memory controller configured to manage an operation of the memory device according to a request from at least one of the host request managing device and the mapping managing device.