Memory Cell Soft Data Sensing in a Single Stepped Read
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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, improving efficiency and accuracy by using the same sense operation for both.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple sense operations are performed to determine soft data, then error correction accuracy is improved, but operation time and processing complexity increase
Solution Approach 1:
The patent combines multiple sense operations into a single integrated operation that simultaneously determines both hard data values and soft data values. The sense circuit performs threshold voltage sensing in one operation, generating both the binary hard data and the probabilistic soft data used for error correction, thereby eliminating the need for separate sense operations and reducing operation time while maintaining error correction accuracy
Solution Approach 2:
The sense operation is designed to serve multiple functions simultaneously: it determines hard data values for direct storage, generates soft data for error correction, and provides threshold voltage information for memory cell characterization. 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 functionality of multiple sense operations into a single integrated process. The sense circuit simultaneously extracts hard data bits and soft data metrics in one operation, reducing the complexity of coordinating multiple separate sense operations, control logic, and data processing stages while maintaining full error correction capability
Solution Approach 2:
The sense operation is designed as a universal function that handles both hard data determination and soft data generation within a single operational framework. This multi-functionality simplifies the overall system architecture by eliminating the need for separate operational sequences and reducing the complexity of control logic required to manage multiple sense operations
3Measurement precision
If traditional sense operations are used, then hard data is determined, but soft data requires additional operations reducing efficiency
Solution Approach 1:
The patent combines hard data sensing and soft data generation into a single sense operation. The sense circuit simultaneously determines the threshold voltage to extract hard data bits and generates soft data metrics indicating the confidence or probability of each bit value, thereby achieving both measurement precision and improved productivity without requiring additional operations
Solution Approach 2:
The sense operation is designed as a multi-functional tool that serves both hard data determination and soft data generation purposes. This universal approach maintains the measurement precision needed for accurate data state sensing while dramatically improving productivity by eliminating the need for separate soft data acquisition operations
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.