Testability Analysis Based on the Identification of Testable Blocks with Predefined Properties

The paper presents testability analysis method that is based on partitioning circuit under analysis (CUA) into testable blocks (TBs). The concept of TBs is further utilized for power consumption reduction during the test application. Software tools which were developed during the research and integrated into the third party design flow are also described. The experimental results gained from the application of the methodology on selected benchmarks and practical designs are demonstrated. It was proven on the benchmarks, used for the verification of the methodology, that a fault coverage comparable to the partial scan method can be obtained. When combined with test vectors/scan cells reordering methodology significant power savings can be reached.