Memory Controller Pre-loading L2P Regions for Sequential Read Throughput
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Solution Overview
Problem
Conventional flash memory devices face significant delays in read operations due to the overhead of loading Logical Block to Physical (L2P) mapping regions from flash memory to the cache, which limits their throughput and fails to fully utilize potential top speed.
Innovation Solution
Implementing a method where the memory controller pre-loads multiple L2P regions into the cache when a sequential read pattern is detected, reducing the need for frequent L2P region loading and minimizing memory controller overhead by executing batched flash read commands across multiple dies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If L2P regions are loaded from flash memory to cache during read operations, then memory access can be performed, but significant delays occur due to the overhead of loading L2P mapping regions
Solution Approach 1:
The patent applies preliminary action by detecting sequential read patterns and pre-loading multiple L2P regions into the cache before they are actually needed for data access. This anticipatory approach eliminates the delay of loading L2P regions during actual read operations, thereby reducing read operation delay while improving overall throughput by keeping the cache populated with upcoming mapping data.
2Ease of operation
If L2P regions are loaded frequently to support read operations, then memory access is maintained, but memory controller overhead increases
Solution Approach 1:
By detecting sequential read patterns and pre-loading multiple L2P regions in advance, the memory controller reduces the frequency of L2P region loading operations. This preliminary action maintains ease of memory access while significantly reducing memory controller overhead by batch-loading regions rather than loading them individually during each read operation.
Solution Approach 2:
The patent merges multiple L2P region loading operations into a single batched operation when sequential read patterns are detected. Instead of loading L2P regions one at a time during individual read operations, the controller combines multiple loading tasks into one unified pre-loading operation, thereby reducing memory controller overhead while maintaining full memory access capability.
3Productivity
If sequential read operations are performed without pre-loading L2P regions, then simple operation is maintained, but read throughput is limited
Solution Approach 1:
The patent resolves this contradiction by implementing preliminary action through sequential read pattern detection and pre-loading of multiple L2P regions. This approach maintains the simplicity of sequential read operations while dramatically improving read throughput by eliminating the time required to load L2P regions during actual data access, achieving up to 12.7% improvement for TLC devices and 9.5% for SLC devices.
Data Source
AI summary
Devices and techniques for improving memory access operations of a memory device are provided. In an example, a method can include loading multiple LBA-to-physical address (L2P) regions of an L2P table from memory arrays of the memory device to a mapping cache in response to determining the LBA of the memory access command is not within the L2P region including of a mapping cache. When the memory access command is a sequential command, the multiple L2P regions loaded to the mapping cache can provide improved memory access performance.