EEVblog #499 - What is JTAG and Boundary Scan?

What is the JTAG interface and Boundary Scanning, how does it work, and what is it useful for? The XJTAG unit: http://www.xjtag.com/jtag-tools/xjlink-xjlink2-jtag-usb.php Forum: http://www.eevblog.com/forum/blog/eevblog-499-what-is-jtag-and-boundary-scan/ EEVblog Main Web Site: http://www.eevblog.com EEVblog Amazon Store: http://astore.amazon.com/eevblogstore-20 Donations: http://www.eevblog.com/donations/ Projects: http://www.eevblog.com/projects/ Electronics Info Wiki: http://www.eevblog.com/wiki/