Nonvolatile Memory Controller Threshold Voltage Distribution Adjustment
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Solution Overview
Problem
Data storage devices face errors due to interference effects between memory cells, which existing technologies fail to effectively correct, leading to reliability issues.
Innovation Solution
A data storage device with a nonvolatile memory system that includes a controller capable of performing a distribution adjusting operation on adjacent memory cells' threshold voltages based on read operation failures, ensuring uniform interference and improved data reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If data is stored in adjacent memory cells, then storage capacity is improved, but interference effects between memory cells cause read errors
Solution Approach 1:
The patent performs a distribution adjusting operation on adjacent memory cells before reading the target memory cell. This preliminary action modifies the threshold voltage distribution of neighboring cells to prevent interference effects from affecting the read operation, thereby ensuring accurate data retrieval while maintaining high storage capacity
Solution Approach 2:
The patent changes the threshold voltage parameter of adjacent memory cells through the distribution adjusting operation. By modifying this critical parameter, the system optimizes the voltage distribution to minimize interference effects on the target cell, resolving the contradiction between maintaining adjacent cell data and ensuring accurate reading
2Reliability
If threshold voltage distribution is adjusted on adjacent memory cells, then interference effects are reduced, but additional operations increase processing time
Solution Approach 1:
The distribution adjusting operation is performed as a preliminary step before the read operation, preparing the memory cell threshold voltage distribution in advance. This timing strategy ensures that the additional processing time is incurred only once during the operation sequence, while the benefit of improved data accuracy is realized during the subsequent read operation
Solution Approach 2:
The system determines whether to perform the distribution adjusting operation based on whether the read operation would fail without it. This feedback mechanism allows the system to selectively apply the additional operation only when interference effects are likely to cause errors, thereby minimizing unnecessary processing time while maintaining data accuracy when needed
Data Source
AI summary
A data storage device may include: a nonvolatile memory device including first and second memory cells adjacent to each other; and a controller suitable for performing a distribution adjusting operation for adjusting a threshold voltage of the second memory cell based on whether a read operation on the first memory cell fails.