Flash Memory Soft Data Sensing in a Single Read Operation
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Solution Overview
Problem
Existing memory technologies face errors due to mechanisms like read disturb and charge loss, which alter the threshold voltage of flash memory cells, leading to incorrect data state sensing, and require multiple sense operations to determine soft data for error correction.
Innovation Solution
A method to determine soft data associated with the data state of a memory cell by performing a single sense operation, which also determines the hard data value, allowing for increased accuracy and reliability by providing confidence information about the stored data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple sense operations are performed to determine soft data for error correction, then error correction capability is improved, but operation time and complexity increase
Solution Approach 1:
The patent combines multiple sense operations into a single operation that simultaneously determines both hard data values and soft data values. The sense circuitry performs one sense operation that generates both the primary data (hard data) and the confidence information (soft data) needed for error correction, eliminating the need for separate sense operations and reducing overall operation time while maintaining error correction capability
Solution Approach 2:
The sense operation is designed to serve multiple functions simultaneously: it determines the hard data state of the memory cell and also generates soft data for error correction. This multi-functional approach allows a single sense operation to replace what would traditionally require multiple separate operations, improving efficiency without sacrificing reliability
2Reliability
If multiple sense operations are performed to determine soft data, then error correction capability is improved, but device complexity increases
Solution Approach 1:
The patent merges the determination of hard data and soft data into a single sense operation, reducing the number of operational steps and simplifying the overall process. The sense circuitry is configured to generate both types of data in one operation, reducing the complexity associated with coordinating multiple separate sense operations
Solution Approach 2:
The patent extracts soft data generation as an inherent capability of the sense operation itself, rather than requiring separate processing steps. The sense circuitry directly produces both hard and soft data in the same operation, eliminating the need for additional processing stages and reducing operational 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.