XJTAG boundary scan fast-tracks solution for testing complex, high-density boards

Technology consulting team at IPSES chose XJTAG boundary scan to test complex boards containing over 20,000 solder joints for Linkra Manufacturing Services whose boards are manufactured and tested for the telecoms giant Italtel. Whereas developing an in-circuit test solution would demand significant engineering commitment, XJTAG was able to test 75% of the board quickly and cost effectively

Recently, the manufacturing division from Linkra Networks engaged IPSES to develop a test solution for complex and densely populated computing boards containing over 20,000 solder joints and with around 5500 connection nets. Linkra had envisaged a strategy based on in-circuit testing. IPSES proposed a faster and more cost effective solution using boundary scan to test the majority of the board’s connections. “The cost of building a fixture and developing software to test this board would be high. We saw the opportunity to deliver a priced solution within a fast turnaround time using the XJTAG boundary scan system”, says Angelo Stella of IPSES.

XJTAG boundary scan is able to test a high proportion of connections and components, including non-JTAG devices, with very few physical connections to the board. Connecting the tester via the 4-pin JTAG header provided on the board, plus additional connections using the XJLink2 I/O expander to enhance test coverage, allows XJTAG’s XJDeveloper application to check the unit under test against board information automatically captured from CAD data or entered manually. XJDeveloper’s advanced graphical interface helps to set up each project and visualise faults with individual boards, and enables faster project completion by providing built-in tests such as connection tests.

Angelo Stella singles out XJTAG’s high-level test description language, XJEase, as one of the most helpful features simplifying the development of tests for non-JTAG devices. “XJEase breaks the boundaries of the boundary scan chain. It is an open language, which can be learned quickly and provides more flexibility than solutions offered by other systems for testing non-JTAG devices.” He adds that some of these alternatives are extra-cost options, whereas XJEase comes with no such restrictions.

Using the built-in test capabilities, clear visualisation tools and DFT analyser provided, and taking advantage of XJEase to maximise test coverage, the team at IPSES created a solution for testing 75% of the board before even considering creating an ICT fixture or using a flying probe tester. “XJTAG effectively solved three quarters of our test challenge with comparatively little engineering effort and without complex custom hardware”, comments Angelo Stella.

An additional advantage is that XJTAG is well suited for use in a production environment, as well as in a development laboratory. “We were able to build the system, including the XJLink2 module, into a robust test station comprising various power supplies, I/Os, and a small bed of nails providing the few direct connections needed. The operator simply places the board on the fixture and presses the Start button. It is a very satisfactory and easy to use solution.”

Using XJTAG, we were able to deliver a competitively priced solution within a fast turnaround time. XJTAG effectively solved three quarters of our test challenge with comparatively little engineering effort and without committing to custom hardware.

The XJEase test description language is more flexible and cost effective than other solutions, and allows us to test beyond the boundaries of the boundary scan chain.

XJTAG boundary scan is able to test a high proportion of connections and components, including non-JTAG devices, with very few physical connections to the board. Using XJTAG, we have achieved a very satisfactory and easy to use solution.

Angelo Stella, Electronics Test Specialist – IPSES

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