Non-volatile Memory Device with Redundant Setting Data Regions
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Solution Overview
Problem
Conventional non-volatile memory devices face issues with reading initial setting data from memory cell arrays, which may include defective columns, leading to errors in setting the operating environment due to the presence of 'fail' columns.
Innovation Solution
A method and device that copy and store setting information in multiple regions of a memory cell array, allowing for an initial read operation to determine valid initial setting data by comparing and combining data values using a majority rule to exclude defective columns, ensuring accurate setting of the operating environment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If initial setting data is read from the memory cell array, then the operating environment can be set, but errors occur when 'fail' columns are present in the array
Solution Approach 1:
The patent stores multiple copies of the same initial setting data in different memory regions (first region and second region). During initialization, both copies are read and compared to determine the final setting data. This copying strategy ensures that if one copy is corrupted by a defective column, the other copy can provide the correct data, thereby resolving the contradiction between reliability and defective columns.
Solution Approach 2:
The patent implements a feedback mechanism where the read data from multiple regions is compared and validated before being used to set the operating environment. The system reads initial setting data from multiple regions, compares the values, and only proceeds with setting the operating environment when the data is confirmed to be consistent and error-free. This feedback loop eliminates errors caused by defective columns.
2Reliability
If multiple copies of setting information are stored in multiple regions, then errors can be detected and corrected, but the device complexity increases
Solution Approach 1:
The patent divides the memory cell array into multiple distinct regions (first region and second region), each storing a copy of the initial setting data. This segmentation allows the system to read and compare data from separate memory locations, improving reliability without requiring a complete redesign of the memory structure. The segmentation strategy balances reliability improvement with acceptable device complexity.
Data Source
AI summary
A method of driving a non-volatile memory device includes supplying power to the memory device, in which setting information related to setting an operating environment is copied and stored in multiple of regions of a memory cell array. An initial read operation of the memory cell array is performed and initial setting data is determined based on the initial read operation. The operating environment of the memory device is set based on the initial setting data. Corresponding portions of the stored copies of the setting information are read at the same time.