We have been starting to see questions about support for DDR4 SDRAM devices, which are gradually becoming available. We have published a guide to using JTAG to test DDR4 memory on the XJTAG website. It contains a link to slides used at a recent presentation on the subject. Support for DDR4 devices will be coming soon [...]
This post is to clarify how to specify terminations to a reference voltage in XJTAG. There are two special classes of passive device in XJTAG which represent termination resistors. […]
1149.6 testing is coming of age, and though XJTAG has supported IEEE Std. 1149.6 since software version 2.1 (released in 2008) it seems to us that 1149.6 devices are becoming much more common in the last couple of years. […]
When helping our customers to understand errors that Connection Test has discovered, we sometimes realise that XJTAG has the information the customer needs, if we were only to display a little more output. […]
This post is to try to clarify what XJTAG understands by the term “differential termination”. […]
A few people have asked us how to deal with differential pins when writing XJEase tests. They see them change value on an oscilloscope during the Connection Test, but aren’t sure how to deal with them explicitly in .xje files. […]
A new major version of XJTAG – version 3.0 – is now available from our website for users who are in maintenance. […]
A new major version of XJTAG – version 2.7 – is now available from our website for users who are in maintenance. […]
This is a common question during the development of a test system. The problem generally occurs when a board is first run, and stems from a slight misunderstanding of what Checkchain is designed to do. This article therefore attempts to explain the difference between the Checkchain function and all other tests, in order to explain [...]