Fuse Test Mode Detection Circuit for Semiconductor Memory
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Solution Overview
Problem
The existing methods for detecting and testing fuse modes in semiconductor memory devices are inefficient, leading to increased production costs and reduced yield due to defective cells, as they require manual confirmation of fuse test mode information and can result in prolonged test times and incorrect identification of malfunctions.
Innovation Solution
A fuse test mode detection device that includes a fuse unit for scanning fuses, a counter for counting fuse data, a decoding unit for controlling the test mode, an encoder for generating a code signal, and a comparator for comparing fuse data with the code signal, allowing for external monitoring of test mode information and efficient detection of malfunctions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If manual confirmation of fuse test mode information is used, then the detection process is simple, but the test time is prolonged and detection efficiency is reduced
Solution Approach 1:
The fuse test mode detection device automatically detects and outputs test mode information without requiring manual confirmation. The detection unit autonomously compares fuse data with code signals and generates test mode information, enabling the system to self-verify its operational state and eliminating dependence on manual intervention.
Solution Approach 2:
The patent replaces manual confirmation processes with an automated electronic detection system. The detection unit, comparator, and output unit work together to automatically identify and communicate fuse test mode status, substituting human operators with electronic circuits that perform the verification function.
2Productivity
If automated detection is implemented, then test efficiency is improved, but device complexity increases
Solution Approach 1:
The detection device integrates multiple functions into a single unified structure. The detection unit simultaneously performs fuse data reading, code signal comparison, and test mode identification, while the output unit communicates multiple types of information (normal operation status, test mode status, malfunction details) through a single interface, reducing the need for separate dedicated circuits for each function.
Solution Approach 2:
The patent introduces a code signal as an intermediary element that represents fuse test mode information in a standardized format. This code signal acts as a mediator between the fuse data and the output unit, simplifying the comparison process and enabling efficient communication of test mode status without requiring complex direct analysis of fuse configurations.
3Device complexity
If fuse test mode information is not externally monitored, then device simplicity is maintained, but malfunction identification accuracy is reduced
Solution Approach 1:
The output unit provides real-time feedback about fuse test mode status to external monitoring systems. By continuously outputting test mode information that reflects the current operational state of the fuse unit, the system enables external verification and logging of test conditions, allowing for accurate tracking of malfunctions and verification of normal operations.
Solution Approach 2:
The test mode information serves as an intermediary signal that carries diagnostic data from the internal fuse detection system to external monitoring equipment. This information acts as a bridge, translating internal fuse states into externally readable formats that enable accurate malfunction identification without requiring direct access to internal fuse configurations.
Data Source
AI summary
A fuse test mode detection device is disclosed, which relates to a technology for improving detection efficiency of a fuse test mode. The fuse test mode detection device includes: a fuse unit configured to scan a plurality of fuses in a boot-up operation, and output fuse data; a counter configured to count the fuse data in response to a clock signal; a decoding unit configured to output a decoding signal for controlling a fuse test mode in response to an output signal of the counter; an encoder configured to encode the output signal of the decoding unit, and output a code signal; and a comparator configured to compare the fuse data with the code signal, and output a comparison signal.