Semiconductor Memory Test Pattern Segmentation for Versatility
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The limited capacity of test equipment restricts the versatility and performance of semiconductor chip testing, as it requires sequential testing using the same test pattern across multiple channels, failing to simulate actual operation environments effectively.
Innovation Solution
A semiconductor memory system that includes a switching circuit and test pattern setup circuit, allowing different test patterns to be applied to channels, with one channel performing an actual test while others undergo dummy operations mimicking the actual environment using pre-programmed dummy test patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If test equipment sequentially tests multiple channels using the same test pattern, then the test equipment can handle limited channels, but test versatility and test performance are reduced
Solution Approach 1:
The test pattern input is segmented into multiple independent test pattern sources (first test pattern and second test pattern), allowing different test patterns to be applied to different channels simultaneously. This segmentation enables the test equipment to handle multiple channels with diverse test requirements without increasing overall system complexity.
Solution Approach 2:
The test equipment is designed with multi-functionality to support both first test pattern and second test pattern inputs, enabling it to perform different types of tests (normal tests and dummy tests) on different channels simultaneously. This universal design improves test versatility while maintaining manageable equipment complexity through standardized interfaces.
2Reliability
If test equipment uses the same test pattern for all channels, then the equipment operation is simple, but it fails to simulate actual operation environments effectively
Solution Approach 1:
Different test patterns are applied to different channels based on their specific testing requirements. The first test pattern is used for channels requiring normal tests, while the second test pattern is used for channels requiring dummy tests. This local differentiation improves test reliability by simulating actual operation environments more accurately while maintaining ease of operation through automated pattern selection.
Solution Approach 2:
The test equipment dynamically selects and switches between different test patterns based on channel-specific requirements. The switching circuit automatically routes the appropriate test pattern to each channel, improving test reliability through environment-specific testing while keeping the operation simple through automated dynamic adjustment without manual intervention.
3Productivity
If multiple channels are tested simultaneously with different test patterns, then test performance improves, but the switching circuit and test pattern setup circuit increase device complexity
Solution Approach 1:
Test patterns are pre-configured and stored in the test pattern setup circuit before actual testing begins. The switching circuit is pre-programmed with the routing logic to direct appropriate test patterns to specific channels. This preliminary preparation enables simultaneous multi-channel testing with different patterns, improving test performance while containing circuit complexity through upfront configuration rather than complex real-time processing.
Solution Approach 2:
The switching circuit acts as an intermediary between the multiple test pattern sources and the memory block, automatically routing the appropriate test pattern to the correct channel. The test pattern setup circuit serves as another intermediary that prepares and stores test patterns before they are applied. These intermediary components enable simultaneous different-pattern testing while managing circuit complexity through standardized mediation interfaces.
4Productivity
If sequential testing is performed on multiple channels, then the test equipment structure remains simple, but the testing time increases and efficiency decreases
Solution Approach 1:
Multiple channels are tested simultaneously and continuously rather than sequentially. The test equipment maintains continuous useful action by applying different test patterns to different channels at the same time, eliminating idle time between channel tests. This parallel processing approach dramatically improves testing efficiency while reducing total testing time through continuous multi-channel operation.
Data Source
AI summary
A semiconductor memory includes a memory block configured to perform an operation according to a first test pattern or a second test pattern, a switching circuit configured to provide the first test pattern or the second test pattern to the memory block according to a first test mode signal and a second test mode signal, and a test pattern setup circuit configured to store a test pattern source signal in a feedback loop varied according to a third test mode signal and output the stored test pattern source signal as the first test pattern.