Column Scramble Pattern for Flash Memory Operational Data Integrity
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Solution Overview
Problem
Flash memory devices face challenges in ensuring the integrity and reliability of operational information storage due to shared sense lines among blocks, which can lead to data corruption if a fault occurs in one block, affecting all blocks on the same plane.
Innovation Solution
The method involves storing operational information in a column scramble pattern across multiple blocks, shifting the order of data units on different blocks to ensure that if a fault occurs, it does not simultaneously affect all copies of operational information stored on common sense lines, thereby maintaining data integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If operational information is stored in the main array to reduce die size, then storage density is improved, but data integrity deteriorates due to shared sense lines
Solution Approach 1:
The patent segments the storage of operational information by distributing copies across multiple blocks with different sense line assignments. Each block stores a copy of the operational information on a different sense line, so that a fault in one sense line does not affect all copies. This segmentation approach maintains high storage density while improving data integrity through spatial distribution of data across independent sensing paths.
2Reliability
If multiple copies of operational information are stored on the same sense line for redundancy, then reliability is improved, but vulnerability to sense line faults increases
Solution Approach 1:
The patent applies local quality by assigning different sense lines to different blocks for storing operational information. Each block uses a dedicated sense line that is unique to that block, creating locally optimized storage where each copy is protected by its own dedicated sensing path. This prevents sense line faults from propagating across multiple blocks, as each block's sense line is isolated from others.
3Device complexity
If operational information is stored in a single block for simplicity, then device complexity is reduced, but reliability deteriorates due to single point of failure
Solution Approach 1:
The patent segments operational information storage across multiple blocks, with each block containing a copy of the operational information. This segmentation provides fault tolerance by ensuring that if one block experiences a fault, the other blocks still contain valid copies of the information. The complexity increase is minimal as the same memory array structure is utilized, only the distribution pattern changes.
Data Source
AI summary
The present disclosure includes methods, devices, modules, and systems for storing operational information in an array of memory cells. One method embodiment includes storing data units of operational information in memory cells of at least one row of a first block of memory cells. The method also includes using a column scramble to shift the order of the data units. The method includes storing the data units in memory cells of at least one row of a second block of memory cells, wherein an order of the data units stored in the at least one row of the second block is different than an order of the data units stored in memory cells of the at least one row of the first block.