详细说明：IEEE StandardTestAccessPort and Boundary-Scan ArchitectureAbstract: Circuitry that may be built into an integrated circuit to assist in the test, maintenance, andsupport of assembled printed circuit boards is defined. The circuitry includes a standard interfacethrough which instructions and test data are communicated. A set of test features is defined,including a boundary-scan register, such that the component is able to respond to a minimum setof instructions designed to assist with testing of assembled printed circuit boards. Also, a languageis defined that allows rigorous description of the component-specific aspects of such testabilityfeatures.……