Text preview for : 5991-2889EN Configuring Boundary Scan Chains on Keysight x1149 Boundary Scan Analyzer - Application part of Agilent 5991-2889EN Configuring Boundary Scan Chains on Keysight x1149 Boundary Scan Analyzer - Application Agilent 5991-2889EN Configuring Boundary Scan Chains on Keysight x1149 Boundary Scan Analyzer - Application Note c20140721 [11].pdf
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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