Adaptive Sensing Time for Memory Read Reliability
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Solution Overview
Problem
Conventional memory systems face challenges in maintaining read window bandwidth (RWB) due to material degradation over time, leading to inadequate differences in threshold voltage distributions and resulting in read and write operation failures.
Innovation Solution
The adaptive sensing time mechanism dynamically adjusts sensing times for memory operations based on program erase cycles, known defects, and variabilities across different portions of memory, allowing for more reliable sensing times that reduce programming and read failures while minimizing impacts on operation speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sensing time is increased to improve reliability of memory operations, then read and write operation failures are reduced, but operation speed and latency increase
Solution Approach 1:
The patent applies dynamics by transitioning from a static sensing time to a dynamic, adaptive sensing time that changes based on memory device conditions. The sensing time is adjusted in real-time based on program erase cycle counts and threshold voltage distribution characteristics, allowing the system to optimize between reliability and speed depending on the current state of the memory device.
Solution Approach 2:
The patent changes the sensing time parameter adaptively based on program erase cycle counts and threshold voltage distribution. By monitoring these parameters and adjusting sensing time accordingly, the system can extend sensing time when degradation is detected (improving reliability) while maintaining shorter sensing times when conditions permit (preserving speed).
2Reliability
If sensing time is extended to compensate for material degradation, then read window bandwidth is maintained, but operation time increases
Solution Approach 1:
The system dynamically adjusts sensing time based on the actual degradation state of the memory device. Rather than using a fixed extended sensing time, the system adapts the sensing duration to match the current program erase cycle count and threshold voltage distribution, maintaining read window bandwidth only when necessary while minimizing time loss.
Solution Approach 2:
The sensing time parameter is changed adaptively based on monitored conditions including program erase cycles and threshold voltage spread. This allows the system to maintain adequate read window bandwidth when material degradation occurs while avoiding unnecessary extensions of operation time when the memory device is still in good condition.
Data Source
AI summary
Methods, systems, and apparatuses include determining an operation type for an operation. A sensing time is elected using the operation type. The operation is executed using the sensing time.