Test Methodology for Defect-based Bridge Faults

• Published in: 2020 IEEE International Test Conference in Asia (ITC-Asia) pp. 106 - 111
• Main Authors: Hu, Yu-Pang, Chang, Shuo-Wen, Wu, Kai-Chiang, Wang, Chi Chun, Huang, Fu-Sheng, Tang, Yi-Lun, Chen, Yung-Chen, Chen, Ming-Chien, Chao, Mango C.-T.
• Format: Conference Proceeding
• Language: English
• Published: IEEE 01.09.2020
• DOI: 10.1109/ITC-Asia51099.2020.00030

A defect-based bridge fault represents the faulty behavior of an interconnect short defect obtained by SPICE-simulating the two shorted cells with the short defect injected. In this paper, we have developed a framework to automatically extract defect-based bridge faults and utilize commercial ATPG to generate corresponding test patterns for a given design. Defect-based bridge fault model can not only describe the faulty behavior of a short defect precisely but also result in collapsible faults at one shorted cell pair. As a result, using defect-based bridge fault model for ATPG can lead to a significantly smaller bridge-fault test set when compared to conventional 4-way dominance bridge fault model, where four non-collapsible faults at one shorted cell pair are considered for ATPG. Also, some short defects can only be detected by the test set for defect-based bridge faults but not by the test set for 4-way dominance bridge faults with more test patterns. The experimental result based on industrial designs has demonstrated the effectiveness of using defect-based bridge faults for ATPG while showing an affordable runtime on extracting defect-based bridge faults.