Storage Device Map Data Segmentation for Speed and Capacity
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Solution Overview
Problem
Current storage devices face limitations in increasing loading capacity and operation speed, particularly in handling map data, which affects their performance in storing and retrieving data efficiently.
Innovation Solution
The storage device incorporates a memory device with a memory cell array that stores both normal and map data, along with a memory controller that manages program, read, and erase operations. It segregates map data into cold and hot data, storing the first map data in a memory buffer and the second in a page buffer group, enabling efficient search and program operations by converting logical block addresses to physical addresses using map data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If map data is stored entirely in the memory controller's memory buffer, then operation speed is improved, but the loading capacity is limited by the buffer size
Solution Approach 1:
The patent divides map data into two segments: first map data stored in the memory controller's memory buffer and second map data stored in the memory device's page buffer group. This segmentation allows the system to maintain fast access to frequently used map data while loading additional map data from the memory device, thereby resolving the contradiction between operation speed and loading capacity.
2Speed
If all map data is loaded into the memory controller, then access speed is improved, but the memory controller's buffer capacity is exceeded
Solution Approach 1:
The patent introduces a second storage dimension by utilizing the memory device's page buffer group in addition to the memory controller's memory buffer. This dimensional expansion allows map data to be distributed across two buffer locations, increasing total capacity while maintaining fast access paths through the page buffer group.
3Quantity of substance
If map data is stored in the memory device only, then storage capacity is improved, but operation speed deteriorates due to additional access steps
Solution Approach 1:
The patent performs preliminary loading of map data from the memory device into the page buffer group before actual access operations. This preliminary action ensures that map data is pre-positioned in a fast-access location close to the memory cells, eliminating the need for additional access steps during normal operations and maintaining high operation speed while providing large storage capacity.
Data Source
AI summary
The present disclosure relates to a storage device and a method of operating the same. The storage device includes a memory device including a memory cell array that stores normal data and map data, and a memory controller configured to control overall operation, including program operation, read operation, and erase operation, of the memory device in response to requests from a host. The memory device is configured to, during a map data load operation, transmit first map data to the memory controller by reading the first map data among the map data stored in the memory cell array, and transmit second map data to a page buffer group of the memory device by reading the second map data among the map data.