Boundary-scan, also known as JTAG or IEEE Std. 1149.1, is a serial interface that gives access to the special embedded logic built-in
into many of today’s integrated circuits (ICs). JTAG/boundary-scan provides a quick and easy method for testing electronic Printed Circuit Board Assemblies or PCBAs for manufacturing faults. It is also widely used for programming ICs such as cPLDs, FPGAs and flash memories on the circuit boards in production as well as after product manufacture if software/firmware updates are needed.

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