Word Line Floating Controller for Memory Failure Detection
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Solution Overview
Problem
Conventional semiconductor memory devices lack a mechanism to detect failures in word lines, which can lead to deterioration over time or during burn-in tests due to weak bridges between interconnections in densely packed memory cells.
Innovation Solution
A word line driving circuit with a floating controller that enables the word line to float in response to a word line floating signal, allowing for the detection of failures by preventing charge flow and supplying a high or low voltage, and a method that includes generating a word line floating signal for testing, writing data, and reading it to assess the word line's integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the memory device uses densely packed memory cells with weak bridges between interconnections, then the integration density is improved, but the reliability deteriorates due to potential word line failures
Solution Approach 1:
The patent applies preliminary action by implementing a word line floating mechanism that proactively isolates potentially failed word lines before they can cause deterioration during burn-in tests or normal operation. The floating controller continuously monitors and can float word lines based on detected conditions, preventing weak bridge failures from progressing into full failures.
Solution Approach 2:
The patent introduces a floating controller as an intermediary component between the word line driver and the word lines themselves. This intermediary can decouple the word line from the driving circuit by floating it, thereby isolating potential failure points and preventing their propagation to other parts of the system.
2Device complexity
If conventional word line driving circuits are used without floating capability, then the device complexity is reduced, but the ability to detect and respond to word line failures is lost
Solution Approach 1:
The patent applies universality by designing a floating controller that can manage multiple word lines with a single control mechanism. The same floating controller can float any of the plurality of word lines as needed, making the system more versatile without proportionally increasing complexity.
Solution Approach 2:
The patent implements feedback through the floating controller that monitors the status of word lines and adjusts their floating state accordingly. The controller receives information about word line conditions and provides appropriate feedback by floating or unfloating word lines to maintain system reliability.
Data Source
AI summary
A semiconductor memory device in accordance with the present invention is able to facilitate detecting whether a word line fails or not by floating the word line. The semiconductor memory device includes a word line driver, and a floating controller. The word line driver is configured to control a word line to be enabled/disabled. The floating controller is configured to control the word line driver to float the word line in response to a word line floating signal.