Nonvolatile Memory Page Access Units for Word Line Failure Isolation
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Solution Overview
Problem
Data storage devices face challenges in ensuring data reliability due to the need for large storage capacities and efficient access control in portable electronic devices, where failures in shared word lines can affect multiple pages, leading to data loss.
Innovation Solution
A data storage device and operating method that sets page access units using alternating pages electrically coupled with different word lines across planes of nonvolatile memory devices, allowing for independent operation and parallel operation of pages, thereby preventing failures from shared word lines, and generates parity data to recover from read failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple pages are electrically coupled with the same word line to increase storage capacity, then storage capacity is improved, but data reliability deteriorates because failures in shared word lines can affect multiple pages
Solution Approach 1:
The patent segments the storage system into multiple independent access units, each accessing different word lines. Specifically, it creates first and second access units where the first access unit uses a first word line and the second access unit uses a second word line, ensuring that failures in one word line do not propagate to other access units.
Solution Approach 2:
The patent applies local quality by making each access unit have independent word line dependencies. The first access unit has a first word line that is not shared with the second access unit, while the second access unit has a second word line that is not shared with the first access unit, creating localized independence that improves reliability.
2Productivity
If pages are organized in traditional access units to enable efficient access, then access efficiency is improved, but vulnerability to word line failures increases
Solution Approach 1:
The patent divides the traditional access unit structure into multiple independent access units. Each access unit is configured to access a specific word line independently, so that the harmful effect of word line failure is isolated to only the affected access unit rather than propagating across the entire storage system.
Data Source
AI summary
An operating method of a data storage device includes setting a first page access unit using a first page electrically coupled with a first word line of a first plane and a second page electrically coupled with a second word line of a second plane; and setting a second page access unit using a third page electrically coupled with a second word line of the first plane and a fourth page electrically coupled with a first word line of the second plane.