We use those devices to drive the nets to which they are connected, and to monitor the values of those nets while tests are running. It is often possible to use JTAG enabled devices to interact with the functionality of non-compliant devices in order to give the best possible test coverage on a DUT.
Consider the nets that run between a processor and a RAM device. These nets can be tested for short circuit faults by our automatic interconnection test — the system will stimulate one net and check to see if the driven value is read on any of the other nets.
However this type of test cannot check for open circuit faults at either the processor or the RAM. Nevertheless, a test that writes data into the memory array of the RAM and then reads values back can be created, and this test can also check for open circuit faults at both devices. There are situations where type of testing can go further — for example external connectors can often be tested by connecting a loopback cable and then sending and receiving data to verify the operation of nets which have no direct connection to the JTAG enabled devices on the board.
Unfortunately this is not possible. JTAG boundary scan is something that the device manufacturer has to add to the device, it cannot be added at a later stage. These files are often available for download from the website of the component manufacturer. Some manufacturers require an NDA in order to release these files but most make these files publicly available. Here are some links to BSDL files from a range of device vendors.
Whilst the IEEE Follow the link above to learn how to identify such devices and supply the additional information to the XJTAG system. A JTAG pin can be set high or low but the voltage driven onto the net is defined by the device being used.
Similarly the JTAG device can capture read a digital value of 1 or 0 but it does not report whether a 1 is caused by a voltage of 3. Boundary scan allows checking whether a resistor is connecting two nets together, providing there is a mechanism to test for open-circuit faults on each side of the resistor. If for example the resistor is connecting a processor to a RAM then we will only be able to verify the connections to the RAM if the resistor is in place.
However it would not be possible to use boundary scan to check whether it is a 0R resistor, a R resistor or even a 1K resistor as the JTAG compliant device would be able to drive signals through all of these values. However the value of the resistor cannot be determined, so a 1K resistor would look the same as a 4. Others may have little effect on the low speed testing that boundary scan tests typically carry out.
However some testing can be performed on inline coupling capacitors if the JTAG compliant devices on both sides of them support the newer If full testing of these components is required then boundary scan testing should be combined with ICT for best results.
To help you evaluate XJTAG software and hardware boundary scan products for debugging, testing and device programming, we offer a day trial period, with no obligation to purchase. As soon as we hear from you, one of our test experts will contact you to discuss your end application and the evaluation process.
Depending on your timescales, we can target the trial to start when you are ready, any time from next day to next quarter. The tools provided for evaluation are fully functional, so all features of the products are available for you to try out. If requested, XJTAG will set up its test system and one development project on your own electronics when you take a day trial. Ideally, we prefer to get the tests up and running on your board.
If you would like us to complete this last stage, we will also need access to a board. We are proud of our support and as with all aspects of the tools, during the evaluation, we encourage you to try it. We provide full technical support by telephone, email and web meeting, to help with the set up or troubleshoot any issues. If you already have the XJTAG Development System for evaluation, you can continue using the product without interruption by purchasing it.
If XJTAG has released new versions of its products since your trial and you are now ready to purchase, you will have access to download the latest version of the software. Possibly — contact us and we will consider your request. Please return your complete system to us and destroy any copies that you have made. You can install version 1. After version 1. For example, you can install 2.
Please upgrade to one of these operating systems before attempting to install XJTAG, and then ensure that it is up to date. We have produced a set of Design For Test DFT guidelines which explain what you need to take into consideration when designing your board, to make sure that as much of your board as possible is testable using JTAG.
XJTAG supports over 90 netlist formats that the system automatically parses, identifies and accepts. If your netlist is not recognised, please contact XJTAG Support and we will be happy to convert it to a format that works and add a parser to a future release.
Once you have received your new licence code, use the Authorisation Codes utility to enter it into your XJLink. XJTAG software licences can be held in the JTAG controller hardware that is used to connect to the board that is being tested, or on a network licence server.
For example, if you have multiple production line setups, use the tools across multiple offices, or share development software for debugging occasional issues. Anyone who needs an XJTAG licence — from the design engineer to the repair technician — can check it out from the server and run the software they need. If you are developing tests without your target hardware you can use a network licence to set-up your tests without having an JTAG controller connected.
Then to run the tests connect an unlicenced JTAG controller and the network licence can be used to execute them. Si es A1 segun e leido mejor no tocarlo. Una vez esho esto salimos guardando las configuraciones y vemos que se nos ven los canales correctamente. Vamos saliendo y guardando configuraciones y listo ya tenemos un jardin precioso. Con la tecla Audio se pasa a "Provider Name".
Si alguien me lee Gracias por la ayuda! Marcadores Marcadores Twitter Facebook.
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