Nonvolatile Memory Global and Local Selection Line Control
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Solution Overview
Problem
Nonvolatile memory devices face challenges in reducing program, read, and erase times due to inefficiencies in controlling global and local lines, leading to increased operational times.
Innovation Solution
A method and structure for controlling nonvolatile memory devices by selectively activating global and local selection lines, where local selection lines are activated either in a random or sequential order while the global selection line is continuously activated, and a boosted power supply voltage is used to enhance selection efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If global and local selection lines are activated sequentially in traditional order, then device complexity is reduced, but program time, read time and erase time increase
Solution Approach 1:
The global selection line is activated in advance before the local selection lines. This preliminary activation prepares the global line to receive and conduct signals, allowing subsequent local line activations to proceed without waiting for global line stabilization, thereby reducing overall operation time.
Solution Approach 2:
The global selection line maintains continuous activation throughout the entire local line selection process. This continuous state ensures uninterrupted signal transmission and allows multiple local lines to be activated in sequence or parallel without requiring repeated global line activation, reducing total operation time.
2Productivity
If multiple local selection lines are activated simultaneously, then productivity is improved, but device complexity increases
Solution Approach 1:
The selection process is divided into two independent stages: global line selection and local line selection. This segmentation allows each stage to be controlled separately, enabling multiple local lines to be activated in parallel after the global line is prepared, thereby improving productivity without proportionally increasing overall system complexity.
Solution Approach 2:
The selection hierarchy transitions from a single-dimensional sequential approach to a two-dimensional hierarchical approach (global dimension × local dimension). This dimensional change enables parallel activation of multiple local lines under a single activated global line, significantly improving operation speed while maintaining manageable complexity through hierarchical organization.
Data Source
AI summary
A nonvolatile memory device includes global selection lines, local selection lines, a first selection circuit, and a second selection circuit. The local lines correspond respectively to the global selection lines. The first selection circuit is configured to connect to the global selection lines to select the global selection lines. The second selection circuit is connected between the global selection lines and the local selection lines and is configured to select the local selection lines. The first selection circuit is configured to select at least one global selection line, and the second selection circuit is configured to select the local selection lines corresponding to the selected global selection line while the at least one global selection line is continuously activated.