A boundary-scan test and diagnosis system (PATRIOT) for detecting and locating defective chips and interconnects on printed-circuit boards is presented. These printed-circuit boards must be designed with boundary-scan chips conforming to the IEEE 1149.1 Standard. The PATRIOT system consists of interconnect test generation software, protocol interface firmware, X-window user interface, and a hardware test controller. It can be linked to any workstation or PC computer which has a SCSI-bus interface. PATRIOT uses the hardware test controller to coordinate data transfer between the computer and the printed-circuit boards. Up to four boards can be tested and diagnosed simultaneously.
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