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A boundary scan chain consists of two or more boundary scan integrated circuit (IC) devices where the test data output (TDO) of the first boundary scan device in the chain is connected to the test data input (TDI) of the second boundary scan device to form a chain. The test mode select (TMS) and test clock input (TCK) signals are common for all the boundary scan devices in a chain.
The Keysight Technologies, Inc. x1149 boundary scan software analyzes the circuit board netlist and the boundary scan description language (BSDL) of the boundary scan device, to detect the chain connections. The boundary scan chain is the key in maximizing the boundary scan test coverage of the board.
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