Memory Controller Wear Leveling and Voltage Compensation
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Solution Overview
Problem
The complexity and performance deterioration of memory systems in data processing, particularly due to repetitive read operations and uneven wear across memory blocks, lead to reduced reliability and efficiency in data storage and retrieval.
Innovation Solution
A memory system with a controller that monitors and manages parameters such as read and program counts, temperature, and voltage offsets across memory blocks, performing adaptive read operations and data reclamation to maintain optimal performance by selecting suitable memory blocks and compensating read voltages, thereby minimizing wear and maintaining data integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If read operations are performed repeatedly on memory blocks, then data access speed is improved, but read disturbance increases causing performance deterioration and reliability reduction
Solution Approach 1:
The controller proactively monitors read counts and identifies memory blocks that have reached a predetermined read threshold before actual read disturbance occurs. By performing wear leveling and data migration in advance, the system prevents performance deterioration and reliability issues rather than reacting after damage occurs.
Solution Approach 2:
The controller continuously monitors read operation counts for each memory block and uses this feedback to dynamically adjust block selection for wear leveling operations. When a block approaches the read threshold, the controller receives feedback about its wear state and initiates migration to balanced blocks, creating a closed-loop control system that maintains reliability.
2Duration of action of stationary object
If wear leveling is performed across all memory blocks, then lifespan is extended, but system complexity increases
Solution Approach 1:
Instead of uniformly applying wear leveling to all memory blocks, the controller monitors each block's read count individually and applies wear leveling operations selectively only to blocks that have reached the predetermined read threshold. This localized approach extends lifespan where needed while minimizing unnecessary operations and complexity.
Solution Approach 2:
The controller uses a predetermined read threshold parameter to determine when wear leveling should be applied. By changing the operational state based on this parameter threshold, the system simplifies decision-making logic - blocks are either monitored for threshold crossing or actively managed through migration, reducing overall system complexity.
3Measurement precision
If voltage offset compensation is applied to all memory blocks, then read accuracy is improved, but processing time increases
Solution Approach 1:
The controller applies voltage offset compensation selectively based on the wear state and read count of individual memory blocks. Blocks that have experienced significant read operations or are being migrated receive voltage compensation to ensure accurate reading during transitions, while blocks in stable state use standard read voltages, optimizing both accuracy and speed.
Data Source
AI summary
A memory system includes: a memory device including a plurality of memory blocks each including a plurality of pages suitable for storing data; and a controller suitable for receiving a plurality of commands from a host, performing a plurality of command executions on the plurality of memory blocks in response to the plurality of commands, checking parameters of the plurality of memory blocks according to the plurality of command executions performed on the plurality of memory blocks, selecting first memory blocks among the plurality of memory blocks according to the parameters, and copying data stored in the first memory blocks to second memory blocks among the plurality of memory blocks.