Wear Leveling with Attack Detection for Non-Volatile Memory
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Solution Overview
Problem
Non-volatile memory devices face excessive wear due to repetitive data access patterns, which can lead to premature degradation and data disturbance, despite wear-leveling techniques that distribute wear across multiple physical locations, as certain access patterns can still result in excessive reads or writes to a single location.
Innovation Solution
A controller is configured to periodically update the logical-to-physical mapping and detect wear-based attacks, modifying the wear-leveling process by changing wear-leveling parameters or sequences of mappings to prevent excessive wear, thereby distributing wear evenly and frustrating malicious access patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wear-leveling is implemented by periodically updating logical-to-physical mapping, then wear is distributed across multiple physical locations, but certain access patterns can still result in excessive reads or writes to a single physical location
Solution Approach 1:
The controller monitors access counts for logical addresses and uses this feedback to detect when an access pattern violates a threshold, indicating a potential wear-based attack. This feedback mechanism allows the system to adapt its wear-leveling strategy in real-time to prevent excessive wear at any single physical location
Solution Approach 2:
The wear-leveling process is made dynamic by allowing the controller to modify wear-leveling parameters and change the sequence of logical-to-physical mappings based on detected access patterns. This dynamic adaptation enables the system to frustrate malicious access patterns that attempt to exploit fixed wear-leveling sequences
2Duration of action of stationary object
If the controller modifies the wear-leveling process by changing wear-leveling parameters, then the lifespan of memory devices is extended, but the complexity of the control mechanism increases
Solution Approach 1:
The controller extends memory lifespan by dynamically changing wear-leveling parameters such as the sequence of logical-to-physical mappings and access count thresholds. These parameter changes allow the system to adapt to different access patterns and prevent premature wear without requiring fundamental architectural changes
Solution Approach 2:
The wear-leveling control is segmented into manageable components: access count monitoring, threshold violation detection, and parameter modification. This segmentation allows the complex control function to be implemented through discrete, independent operations that can be managed separately
Data Source
AI summary
Apparatuses, systems, and methods are disclosed for wear leveling for non-volatile memory. An apparatus may include one or more non-volatile memory elements, and a controller. A controller may perform a wear-leveling process for one or more non-volatile memory elements, by periodically updating a logical-to-physical mapping and moving data based on the updated mapping. A controller may detect a wear-based attack for one or more non-volatile memory elements. A controller may change a wear-leveling process in response to detecting a wear-based attack.