Storage Controller Non-Volatile Memory Mapping Segmentation
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Solution Overview
Problem
Current storage devices face decreased operating speed due to the increased number of read operations on non-volatile memory when mapping data exceeds the capacity of the working memory, leading to missed data retrieval and reduced performance.
Innovation Solution
A storage device architecture that includes a first non-volatile memory for storing logical and physical address values and a second non-volatile memory, with a storage controller that reads physical addresses from the first memory and controls read operations on the second memory based on these addresses, reducing the need to load mapping data into the working memory.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If mapping data is stored in non-volatile memory, then storage capacity is increased, but operating speed decreases due to increased read operations
Solution Approach 1:
The patent divides the memory system into two distinct non-volatile memory regions: a first non-volatile memory for storing mapping data (logical-to-physical address translations) and a second non-volatile memory for storing user data. This segmentation allows the system to access mapping data directly from non-volatile memory without loading it into working memory, thereby maintaining high storage capacity while improving operating speed by reducing read operations on the second memory.
Solution Approach 2:
The patent introduces a storage controller as an intermediary component that manages data access between the host, first non-volatile memory (mapping data), and second non-volatile memory (user data). The controller reads mapping data from the first non-volatile memory to obtain physical addresses, then uses these addresses to access the second non-volatile memory, eliminating the need to load entire mapping datasets into working memory and reducing read operations.
2Speed
If mapping data is loaded to working memory, then operating speed increases, but working memory capacity is exceeded when mapping data is large
Solution Approach 1:
The patent extracts the mapping data storage function from the working memory and relocates it to a dedicated first non-volatile memory. This extraction allows the system to maintain only the necessary mapping data in non-volatile memory while keeping working memory available for active data processing, thus improving operating speed without exceeding working memory capacity.
3Reliability
If mapping data exceeds working memory capacity, then data retrieval fails, but increasing working memory increases cost and complexity
Solution Approach 1:
The patent segments the memory system into specialized non-volatile memory regions, with the first non-volatile memory dedicated to mapping data and the second to user data. This segmentation ensures that mapping data is always available in non-volatile storage, preventing data retrieval failures without requiring an increase in working memory capacity, thus avoiding increased cost and complexity.
Data Source
AI summary
A storage device is provided. The storage device includes: a first non-volatile memory including a plurality of cell strings storing a plurality of logical address values and a plurality of physical address values; a second non-volatile memory including a plurality of memory cells corresponding to the plurality of physical address values; and a storage controller configured to read a first physical address value from the first non-volatile memory based on a first logical address value, and control a read operation on the second non-volatile memory based on the first physical address value. A first cell string among the plurality of cell strings includes: a plurality of first memory cells storing the first logical address value and respectively connected to word lines in a first group; and at least one second memory cell storing the first physical address value and connected to at least one word line in a second group.