Non-Volatile Memory Overdrive Voltage Control After Failures
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Solution Overview
Problem
Existing non-volatile memory systems face challenges in reliably storing and retrieving data due to memory operation failures, which can be attributed to improper control of overdrive voltage applied to word lines.
Innovation Solution
Implementing intelligent control of the overdrive voltage applied to word lines to prevent memory operation failures by detecting and adjusting the voltage when necessary to avoid such failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If overdrive voltage is applied to word lines to enable memory operations, then memory operation speed is improved, but memory operation failures occur due to improper voltage control
Solution Approach 1:
The patent applies dynamics by making the overdrive voltage adjustable rather than fixed. The system dynamically modifies the overdrive voltage applied to dummy word lines based on detected memory operation failures, transitioning from a static voltage approach to a dynamic one that adapts to actual memory cell conditions, thereby resolving the contradiction between speed and reliability
Solution Approach 2:
The patent implements feedback by detecting memory operation failures and using this information to adjust the overdrive voltage for subsequent operations. The system monitors memory operation outcomes and feeds this information back to modify the voltage applied to dummy word lines, creating a closed-loop control system that improves reliability while maintaining operation speed
Solution Approach 3:
The patent applies parameter changes by modifying the overdrive voltage parameter based on detected failures. When memory operation failures are detected, the system changes the voltage parameter applied to dummy word lines, adjusting it to prevent future failures while maintaining adequate operation speed
2Reliability
If overdrive voltage is increased to prevent memory operation failures, then reliability is improved, but additional complexity is introduced in voltage control
Solution Approach 1:
The patent applies segmentation by isolating the voltage adjustment mechanism to only the dummy word lines rather than modifying the entire memory array control. This segmented approach allows reliability improvement through selective voltage modification without introducing system-wide complexity, as only specific word lines receive the adjusted overdrive voltage
Solution Approach 2:
The patent uses dummy word lines as intermediaries to implement the complexity reduction strategy. Instead of directly controlling every memory cell's voltage, the system applies modified overdrive voltage to dummy word lines that act as mediators, indirectly influencing memory cell operations while simplifying the control architecture
3Ease of manufacture
If dummy word lines are used in memory structure, then manufacturing is facilitated, but memory operation failures occur due to improper voltage control
Solution Approach 1:
The patent converts the harmful effect of dummy word lines causing operation failures into a beneficial diagnostic opportunity. By detecting failures associated with dummy word line voltage control, the system identifies and corrects the underlying voltage issue, ultimately improving reliability while preserving the manufacturing advantages of using dummy word lines
Data Source
AI summary
A non-volatile memory system detects a memory operation failure. In response to the memory operation failure, the system determines whether adjusting an overdrive voltage applied to a word line avoids the memory operation failure. If adjusting the overdrive voltage applied to the word line avoids the memory operation failure, then future memory operations are performed by applying the adjusted overdrive voltage to the word line.