Memory Unit Division for Threshold Voltage Distribution Optimization
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Solution Overview
Problem
Conventional high-capacity memory units face challenges in maintaining a sufficient sensing window for state distinction while reducing power consumption and extending service life, as increased program threshold voltage difference shortens service time and increases power consumption, and reducing this difference narrows the sensing window, making state distinction difficult.
Innovation Solution
Divide the memory unit into small groups, define threshold voltage distribution regions, and determine program verify threshold voltages and reference detecting values for each group to enhance the cycling margin and prolong service life, suitable for multi-level-cell (MLC) operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the program threshold voltage difference between states is increased to enhance the sensing effect, then the sensing window is enlarged, but the power consumption increases and service life is shortened
Solution Approach 1:
The patent divides the memory unit into multiple small memory groups, each with its own threshold voltage distribution region. This segmentation allows independent optimization of each group's threshold voltage distribution, enabling narrower overall voltage ranges while maintaining sufficient sensing windows through group-specific parameter tuning.
Solution Approach 2:
Each small memory group is assigned a specific threshold voltage distribution region with customized parameters. The patent applies local quality by allowing different threshold voltage characteristics for different groups, optimizing each group's sensing window and power consumption independently rather than using uniform parameters across the entire memory unit.
2Duration of action of stationary object
If the program threshold voltage difference between states is reduced to prolong the service life and reduce power consumption, then the sensing window between states is narrowed, making state distinction difficult
Solution Approach 1:
By segmenting the memory into small groups with independent threshold voltage distribution regions, the patent can reduce the program threshold voltage difference for each group while maintaining adequate sensing windows. The segmentation prevents the voltage distributions from overlapping excessively, allowing narrower overall voltage ranges without sacrificing state distinguishability.
Solution Approach 2:
The patent changes the threshold voltage distribution parameters for each small memory group, creating optimized voltage ranges that balance sensing window size and power consumption. By adjusting parameters such as the center voltage and spread of each group's threshold distribution, the patent achieves narrower overall voltage differences while maintaining sufficient separation for reliable sensing.
3Quantity of substance
If the memory capacity is increased to store more data, then the voltage distribution range becomes excessively large, but the sensing window between states is reduced
Solution Approach 1:
The patent segments the high-capacity memory unit into multiple small memory groups, each managing a portion of the total capacity. This segmentation allows the voltage distribution range for each group to remain manageable and optimized, preventing the excessive voltage spread that would occur in a single large memory unit. Each group's independent optimization maintains adequate sensing windows despite the overall high capacity.
Data Source
AI summary
A method for data storage of a memory unit and a memory unit using the same are provided in the present invention. The method for data storage of a memory unit includes: first, dividing a memory unit into a plurality of small memory groups; next, defining a threshold voltage distribution region for each small memory group; then, defining a plurality of program verify threshold voltages and a plurality of reference detecting values for each small memory group according to the threshold voltage distribution region of each small memory group; and after that, using these small memory groups to store data.