Controller Caching Order for Map Data Access
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Solution Overview
Problem
Current memory systems face challenges in improving access performance, particularly in quickly acquiring map data from memory devices, which affects overall system efficiency and speed.
Innovation Solution
A controller with a cache and a flash translation layer (FTL) determines a caching order for map data, requests the data from the memory device, and marks a marking region to check for changes, allowing for the acquisition of request map data before the entire segment is cached, thereby enhancing access performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the entire map segment is cached before acquiring request map data, then data accuracy is ensured, but access time increases
Solution Approach 1:
The patent applies preliminary action by determining a caching order before actually caching the map segment. The FTL identifies which map data will be cached first, second, third, etc., and sets marking regions in advance. This allows the system to acquire request map data as soon as it completes caching according to the predetermined order, rather than waiting for the entire segment to be cached, thus reducing access time while maintaining data accuracy.
Solution Approach 2:
The patent segments the map segment into multiple pieces of map data with different caching priorities. By dividing the map segment and assigning a caching order to each piece, the system can acquire the requested map data once its specific caching position is completed, without waiting for the entire segment. This segmentation approach resolves the contradiction by allowing partial acquisition while ensuring data accuracy for the requested portion.
2Ease of manufacture
If map data is cached in sequential order from the beginning, then caching simplicity is maintained, but access performance deteriorates when request map data is located in the latter half of the segment
Solution Approach 1:
The patent applies preliminary action by determining the caching order in advance based on the location of the request map data. When the request map data is in the latter half of the segment, the FTL determines that subsequent map data (which would be cached after the request data) should be cached first, followed by the request map data. This predetermined strategy optimizes access performance without complicating the caching process, as the order is determined before caching begins.
Solution Approach 2:
The patent introduces dynamics by making the caching order adaptable based on the location of the request map data. The FTL dynamically determines whether to cache in forward or reverse order depending on whether the requested data is in the first or second half of the segment. This dynamic adjustment optimizes access performance for different scenarios while maintaining caching simplicity through automated determination of the appropriate order.
Data Source
AI summary
Provided is an operation method of a controller which controls a memory device. The operation method may include: determining a caching order of plural pieces of map data included in a request map segment including request map data; requesting the request map segment from the memory device; marking data in a marking region which is determined based on the caching order; caching, in the caching order, the plural pieces of map data read from the memory device; and acquiring the request map data from the cached data, depending on whether the data stored in the marking region is changed.