Non-Volatile Memory Blank State Detection via Time Domain Signal Processing
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Solution Overview
Problem
In non-volatile memory (NVM) systems, detecting a blank state after an erase operation is challenging due to unpredictable read results from cell pairs, where both cells are in the erased state, leading to unreliable data decoding without additional time-consuming read operations or increased complexity in the analog domain.
Innovation Solution
Transforming electrical variables of each cell into a time domain and comparing the transformed values of at least two cells, specifically true and complementary cells, to determine if a memory area is in a blank state by identifying consecutive '0' values across multiple cells, thereby distinguishing between valid data and a blank state without additional read operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional read operations are performed to detect blank states, then detection reliability is improved, but operational time increases
Solution Approach 1:
The patent transforms electrical variables into time domain values before comparison, preparing the data in advance for reliable blank state detection. This preliminary transformation enables accurate detection without requiring additional read operations, thus maintaining speed while improving reliability
Solution Approach 2:
The patent replaces additional mechanical read operations with a signal processing approach. By transforming electrical variables into time domain and comparing them, the system achieves reliable blank state detection without the need for extra physical read cycles, thereby reducing time loss
2Measurement precision
If analog domain operations are increased to detect blank states, then detection accuracy is improved, but device complexity increases
Solution Approach 1:
The patent substitutes complex analog domain operations with time domain signal processing. By transforming electrical variables and performing comparisons in the time domain, the system achieves accurate blank state detection while avoiding increased analog circuit complexity
Solution Approach 2:
The patent changes the parameter domain from electrical variables to time domain values. This transformation enables accurate blank state detection through time-based comparison rather than complex analog operations, maintaining precision while reducing device complexity
3Reliability
If more memory cells are used per data bit for differential read, then data reliability is improved, but memory area increases
Solution Approach 1:
The patent enables the existing memory cells to serve dual purposes: storing data and providing blank state detection information. By transforming and comparing electrical variables from the same cells used for differential read, the system achieves reliable data decoding without requiring additional memory area
Data Source
AI summary
A method for data processing is suggested including: (i) transforming electrical variables for each cell of a data bit of a memory into a time domain; and (ii) determining a predetermined state by comparing the transformed electrical variables of at least two data bits.