XJTAG Boundary Scan Test
The electrical testing of printed circuit boards has been done with rigide needle adapters in in-circuit testers or flying probe testers. However, this assumes that the signals are mechanically accessible either on pads or special test points. By the miniaturization the available space is getting smaller and smaller, and it becomes more and more difficult to place the required number of test points. For BGA packages that may be connected via internal layers with other BGAs, signals can partially not be passed to the outside, because it has an influence on the signal quality (Signal Integrity). Boundary Scan is another testing method that is used as a supplement to the existing test procedures. Many BGAs come already with a four or five-pin JTAG interface. When BGAs are connected to a a JTAG bus on a circuit board, so they can be tested and their adjacent components such as RAM, Flash can be included in the electrical self-test.
The Boundary Scan solution from XJTAG is a low cost solution to create the test protocol for a Boundary Scan Test. Upon delivery you receive a case, the complete equipement consisting of hardware and software to realize boundary scan tests. With XJLink the USB interface adapter you connect your PC and the JTAG interface on your prototype board. Also your assembler who is doing the test run in the production will connect the boards in this way. The included software helps you to create a complete test report. In a library the internal models of JTAG-compliant components are contained which you will interconnect then. Non contained models will be created by XJTAG without any costs. In addition to this you get a demo board you can use to learn the handling of the software, togehter with the included tutorials.
Expert (incl. oscilloscope)
XJIO & XJIO-PCI Expansions Boards
Design Guideline for Boundary Scan