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Keysight Technologies
Configuring Boundary Scan Chains on
Keysight x1149 Boundary Scan Analyzer



                            Application Note
Introduction

     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. See
     Figure 1.




     Figure 1. A boundary scan 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.

     Engineers who use typical benchtop boundary scan tools today need
     knowledge of the board to define the chain. This is a time-consuming process
     as engineering time is needed to manually define the connection of the printed
     circuit board boundary scan chain before the software can detect the boundary
     scan chain.

     This application note provides the procedure for configuring the boundary scan
     chain of a board.
1. Input file    

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