Multi-Plane Nonvolatile Memory String Select Line Isolation
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Solution Overview
Problem
Existing nonvolatile memory devices with multi-plane structures face performance degradation due to defects in string select lines, as a defect in one plane can affect multiple planes, leading to malfunction and reduced integration density.
Innovation Solution
A nonvolatile memory device with a multi-plane structure that independently selects cell strings using distinct string select lines for each plane, allowing for independent control and minimizing the impact of defects by using separate string select lines for each plane, thereby isolating the malfunction to a single plane.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If shared string select lines are used across multiple planes, then device complexity is reduced, but reliability deteriorates due to defect propagation affecting multiple planes
Solution Approach 1:
The patent divides the string select line control into separate segments for each plane. Each plane has its own dedicated string select lines (e.g., SSL1a, SSL1b for first plane; SSL2a, SSL2b for second plane), allowing independent selection and isolation of cell strings in each plane. This segmentation prevents defect propagation across planes while maintaining manageable device complexity through systematic organization.
2Reliability
If independent string select lines are used for each plane, then reliability is improved by isolating defects, but device complexity increases
Solution Approach 1:
The patent implements local quality by providing plane-specific string select lines that are optimized for each plane's independent operation. Each plane's string select lines are configured with specific voltages and control signals tailored to that plane's requirements, enabling localized defect isolation while maintaining overall system reliability through differentiated local control characteristics.
Data Source
AI summary
A nonvolatile memory device includes a memory cell array having a first plane and a second plane and an address decoder connected to the first plane through first string select lines and connected to the second plane through second string select line. The address decoder provides a string select signal and a string unselect signal to the first and second string select lines. The address decoder independently provides the string select signal and the string unselect signal to the first and second string select lines in each plane based on different string select line addresses corresponding to the first and second planes.