Flash Memory Charge Tiering for Higher-Density Reliable Storage
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Solution Overview
Problem
Conventional flash memory technologies using multiple data levels per cell are prone to errors during read and write operations and are limited to storing data levels corresponding to even powers of two, which restricts their capacity and reliability.
Innovation Solution
The system employs a flash memory configuration with programmable target charge levels that can define a non-integer power of two data values, using error correction and compensation methods to enhance data storage and retrieval accuracy, including a controller that accesses and adjusts memory cells to establish corrected charge levels based on performance characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple data levels are stored within a single memory cell, then data storage capacity is increased, but error proneness during read and write operations increases
Solution Approach 1:
The patent divides the charge storage capacity into multiple discrete charge tiers, each representing a specific data level. This segmentation allows the memory cell to store multiple data levels (2, 3, 4, or more levels) by assigning target charge levels to each tier, thereby increasing storage capacity while maintaining reliable distinction between levels through programmed charge thresholds.
2Quantity of substance
If conventional flash memory uses multiple data levels per cell, then storage capacity increases, but the system is limited to storing data levels corresponding to even powers of two
Solution Approach 1:
The patent implements a dynamic charge tier structure where the number of charge levels can be programmably adjusted between 2, 3, 4, or more levels based on operational requirements. This dynamic configuration allows the memory system to adapt between different storage capacities and data level representations, breaking the conventional limitation to even powers of two while optimizing for specific application needs.
3Adaptability or versatility
If target charge levels are programmably movable, then adaptability of data storage increases, but complexity of the processing arrangement increases
Solution Approach 1:
The patent employs programmable parameters that define target charge levels for each charge tier. These parameters can be adjusted to move charge tiers up or down within the charge storage capacity, allowing flexible configuration of data levels. The processing arrangement uses these programmable parameters to control charge pumping operations, enabling adaptability without requiring complex hardware reconfiguration.
Data Source
AI summary
A method and system for storing and retrieving data using flash memory devices. One example system includes an apparatus within a flash memory configuration. The flash memory configuration includes a plurality of memory cells, where each memory cell has a charge storage capacity for use in implementing digital storage. The apparatus includes a processing arrangement configured to access each of the memory cells in a write operation and a read operation. The apparatus also includes an instruction set for instructing the processor to impose target charge levels for defining a plurality of data values for each of the memory cells. The target charge levels are programmably movable with respect to the charge storage capacity.