Satellite hierarchical system test using IEEE 1149.1-based COTS test tools. A case history with results and lessons

Hughes Space Communications applied IEEE Standard 1149.1-1990, The Standard Test Access Port and Boundary-Scan Architecture, to design a structured testing methodology for its HS601 digital global communication satellites. Previous functional test strategies were being challenged by increasing component density and rapidly increasing manufacturing volume. Structural tests written for ASICs were reusable when testing MCMs, boards, and units. Structural testing resulted in fewer no-fault-found components than previously experienced using functional test strategies. System test access across backplanes was achieved using National Semiconductor's multidrop, addressable 1149.1-based SCAN Bridge. Commercially available enhancements to Teradyne's Victory software were used to address each 1149.7-testable component at each level of the hardware hierarchy. Hughes Space Communications created test management software to manage this test environment. Whenever a test is needed, if is assembled to match the hardware version and the appropriate level of hierarchy. This paper presents the results for a global communications satellite system that uses a test strategy outlined.