Boundary-Scan Interconnection Lines for Multi-Board Test Coverage
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Solution Overview
Problem
Existing boundary-scan test technologies face challenges in efficiently establishing subtests and interconnection lines across multiple plugged boards with various intermediate components, while ensuring accuracy and high coverage of path search operations.
Innovation Solution
A method and device that establish a boundary-scan test model, construct boundary-scan nets, generate paths, filter and integrate valid paths, and divide them into subtests with boundary-scan interconnection lines, utilizing modules for model establishment, construction, searching, processing, and dividing to efficiently create associations between boundary-scan pins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple plugged boards with various intermediate components are tested using conventional boundary-scan test technologies, then test coverage can be achieved, but the efficiency of establishing subtests and interconnection lines deteriorates and path search accuracy is compromised
Solution Approach 1:
The patent segments the complex boundary-scan test into multiple subtests, each handling specific interconnection lines between boundary-scan components. By dividing the overall test into smaller, manageable subtests with dedicated interconnection lines, the system achieves both high path search accuracy within each subtest and improved overall efficiency through parallel processing and reduced complexity per test case.
2Loss of information
If conventional methods are used to establish boundary-scan interconnection lines across multiple boards, then basic test functionality is maintained, but data loss occurs and coverage is reduced
Solution Approach 1:
The patent introduces intermediate components as mediators between boundary-scan components on different boards. These intermediaries facilitate reliable signal transmission and data integrity across multiple plugged boards, preventing data loss while managing the complexity of inter-board connections through standardized interface protocols and dedicated interconnection lines.
Data Source
AI summary
A method and a device for generating boundary-scan interconnection lines are disclosed. In the method, the boundary scan test model is established according to boundary scan components and intermediate components on least one test card and a unit under test (UUT) board, and connection relationships therebetween; the boundary scan nets of the boundary scan test model are constructed; the boundary scan paths of each boundary scan net are generated, and a path establishment condition of each boundary scan path is obtained; and the boundary scan paths are filtered and integrated, and the filtered and integrated boundary scan paths are divided according to the path establishment conditions of filtered and integrated boundary scan paths, into subtests which each has at least one boundary-scan interconnection line. As a result, the accuracy and high coverage of a path search operation can be guaranteed.