Memory Controller Wear-Leveling via Logical Address Routing
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Solution Overview
Problem
Existing memory controllers face challenges in achieving uniform wear-leveling across different memory areas, leading to uneven erase/write cycle counts and potential premature failure of memory devices due to uneven access patterns of logical addresses.
Innovation Solution
A memory controller with a logical address manager that compares received logical addresses with a reference address, using criteria to dynamically route addresses between multiple flash translation layers, ensuring even distribution of operations across memory areas based on change basis information and swap timing/offset.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single flash translation layer controls all memory areas, then the control structure is simple, but wear-leveling performance deteriorates due to uneven access patterns
Solution Approach 1:
The memory controller divides the memory device into multiple memory areas (first memory area and second memory area), each controlled by a separate flash translation layer. This segmentation allows independent management of different memory regions, enabling better wear-leveling distribution across the entire memory device while maintaining relatively simple control structures within each layer.
2Reliability
If logical addresses are uniformly distributed across memory areas, then wear-leveling performance improves, but access time increases due to address comparison and routing operations
Solution Approach 1:
The logical address manager pre-establishes routing criteria that map logical addresses to specific flash translation layers based on comparison with a reference address. This preliminary organization of address routing information allows the system to achieve uniform wear-leveling distribution without requiring complex real-time decisions, thereby reducing access time while maintaining reliability.
3Reliability
If multiple flash translation layers are used to improve wear-leveling, then wear-leveling performance improves, but device complexity increases
Solution Approach 1:
The memory controller is segmented into multiple flash translation layers, each responsible for controlling specific memory areas. This segmentation improves wear-leveling performance by distributing access patterns across multiple independent control paths.
Solution Approach 2:
Each flash translation layer is designed with universal functionality to handle read, write, and erase operations independently. This multi-functionality allows the system to achieve improved wear-leveling without proportionally increasing overall device complexity, as each layer performs the same set of operations on its designated memory area.
4Reliability
If logical addresses are routed to specific flash translation layers based on comparison results, then wear-leveling uniformity improves, but control complexity increases
Solution Approach 1:
The logical address manager pre-establishes routing criteria that use simple comparison operations with a reference address to determine which flash translation layer should handle each logical address. This preliminary organization of routing logic achieves uniform wear-leveling distribution while keeping the control complexity manageable through straightforward comparison-based decision-making.
Data Source
AI summary
Memory controller devices, memory systems, and operating methods for memory controller devices and memory systems are disclosed. In one aspect, a memory controller having improved wear leveling performance is disclosed. The memory controller may control a first memory area and a second memory area, and include a first software layer configured to control the first memory area based on first logical addresses, a second software layer configured to control the second memory area based on second logical addresses, and a logical address manager configured to compare a logical address received from a host with a reference address selected from among a plurality of logical addresses to be used by the host, and transmit the logical address received from the host to the first software layer or the second software layer according to a criterion selected from between a first criterion and a second criterion based on the comparison.