Flash Memory Soft Data Sensing in a Single Read Operation
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Solution Overview
Problem
Existing memory technologies face challenges in accurately determining the state of flash memory cells due to mechanisms like read disturb and charge loss, leading to errors that are difficult to correct without additional sense operations.
Innovation Solution
The method involves performing a single sense operation on memory cells to determine both hard data and soft data, which indicates the quality and confidence of the stored data, allowing for increased accuracy and reliability by providing additional information about the data state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple sense operations are performed to determine soft data, then measurement precision is improved, but loss of time increases
Solution Approach 1:
The patent combines multiple sense operations into a single operation that simultaneously determines both hard data and soft data. The sense circuit performs a unified sensing process that extracts multiple data types in one execution, eliminating the need for separate operations and reducing time loss while maintaining measurement precision.
Solution Approach 2:
The sense operation is designed to serve multiple functions simultaneously: determining hard data states and extracting soft data information about data quality and confidence. This multi-functional approach allows a single operation to replace what would traditionally require multiple specialized operations, improving efficiency without sacrificing accuracy.
2Reliability
If multiple sense operations are performed to correct errors, then reliability is improved, but productivity decreases
Solution Approach 1:
The patent performs soft data determination as a preliminary action within the same sense operation that retrieves hard data. By preparing and determining soft data simultaneously with hard data in a single operation, the system enables more effective error correction without requiring additional time-consuming operations, thus improving reliability while maintaining productivity.
Solution Approach 2:
The patent merges error correction information gathering with the primary data retrieval operation. By combining soft data determination (which provides error correction information) with hard data reading in a single sense operation, the system achieves both reliability improvement and productivity maintenance, as no separate error correction assessment operations are needed.
3Measurement precision
If additional sense operations are performed to determine data quality, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The sense operation is designed as a universal, multi-functional unit that can determine hard data states, soft data quality metrics, and confidence levels all in one execution. This consolidated approach improves measurement precision for data quality assessment while avoiding the need for multiple separate sense circuits or operations, thereby reducing overall device complexity.
Data Source
AI summary
The present disclosure includes apparatuses and methods for determining soft data. A number of embodiments include determining soft data associated with a data state of a memory cell. In a number of embodiments, the soft data may be determined by performing a single stepped sense operation on the memory cell.