IEEE1149IEEE Std 1149.1-2001(Revision of IEEE Std 1149.1-1990)IEEE Standard Test Access Port and Boundary-Scan ArchitectureSponsorTest Technology Standards Committee of the IEEE Computer SocietyApproved 14 June 2001IEEE-SA Standards BoardAbstract: Circuitry that may be built into an integrated circuit to assist in the test, maintenance, and support of assembled printed circuit boards is defined. The circuitry includes a standard interface through 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 set of instructions designed to assist with testing of assembled printed circuit boards. Also, a language is defined that allows rigorous description of the component-……