Non-Volatile Memory Spare Block Management for Lifespan Extension
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Solution Overview
Problem
Non-volatile memory blocks have a limited number of erase cycles, leading to defective blocks and reduced lifespan, necessitating a method to extend operating lifespan and notify users of performance capability to prevent data loss.
Innovation Solution
A method that reserves spare blocks for data update operations, monitors average erase counts, and performs a limp function to configure a minimum number of spare blocks for data updates, generating indications to alert users of performance status and facilitate data backup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If spare blocks are reserved for data update operations, then data integrity is maintained, but the number of available blocks for storage is reduced
Solution Approach 1:
The patent reserves spare blocks in advance for data update operations before they are needed. This preliminary allocation ensures that when data updates are required, the necessary blocks are already available, maintaining data integrity without requiring dynamic block allocation that would reduce available storage capacity.
Solution Approach 2:
The patent divides the non-volatile memory into distinct segments: data blocks for storage, spare blocks reserved for updates, and defective blocks. This segmentation allows the system to maintain data integrity through dedicated update blocks while clearly separating these functions from the general storage capacity, enabling users to understand the actual available blocks for data storage.
2Productivity
If the number of erase cycles is increased, then more data updates can be performed, but the memory blocks become defective and read-only
Solution Approach 1:
The patent implements a monitoring mechanism that tracks the number of erase cycles for each block and compares it against threshold values. When blocks approach their erase cycle limit, the system provides feedback by marking them as defective or read-only, preventing further erasure operations that would degrade reliability. This feedback loop allows the system to maximize productive updates while protecting against block failure.
Solution Approach 2:
The patent changes the operational status of blocks based on their erase cycle count by introducing threshold parameters. When the erase count exceeds a threshold, the block's functionality changes from fully operational to defective or read-only. This parameter-based approach allows the system to manage block lifespan and prevent catastrophic failures while maximizing the number of productive update cycles.
3Reliability
If performance capability status is monitored and users are notified, then data loss can be prevented, but system complexity increases
Solution Approach 1:
The patent implements self-service monitoring where the non-volatile memory system automatically tracks its own performance capability status through erase cycle counting and threshold comparison. The system autonomously generates notifications to users when blocks approach failure thresholds, eliminating the need for complex external monitoring systems while still providing reliable data loss prevention through automated status tracking and user alerting.
Data Source
AI summary
A method for operating a non-volatile memory is provided. The non-volatile memory includes a plurality of physical blocks having a plurality of data blocks and spare blocks. An index is obtained by comparing an average erase count of selected physical blocks with a first threshold. Each erase count for each physical block is the total number of the erase operations performed thereon. A performance capability status for the memory is determined according to the index. The performance capability status is set to a first status when the average erase count exceeds the first threshold. An indication is generated based on the performance capability status. A limp function is performed in response to the first status for configuring a minimum number of the at least some spare blocks reserved and used for data update operations.