JTAG Boundary Scan Test Systems (IEEE 1149.1)

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XJTAG's Advanced Connection Test

A connection or interconnect test is a vital part of any testing suite, checking that components are properly soldered onto the board and that there are no short circuits.

Examples of faults tested for by the XJTAG connection test

Improved connection testing

The XJTAG connection test detects PCB faults in three categories: short circuit, open circuit and stuck-at faults. While these are the same categories of faults that are identified by other connection tests, XJTAG is able to identify more faults and indicate their positions more precisely.

ATPG "On The Fly"

The XJTAG Connection Test generates its test patterns each time it is run, so any design modifications to the board can be quickly and easily incorporated without the need to have a new set of tests developed by your connection test vendor.

Test Beyond Resistors

The XJTAG connection tests checks for faults beyond resistors

This diagram shows a situation that causes a major problem for many JTAG connection tests. While the conflicting algorithm, used by many traditional connection tests, is able to identify the short circuit between nets C and D, the inline resistors in nets A and B mean that the short circuit between those two nets would not be detected. The XJTAG connection test algorithm overcomes this problem.

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