Literally, IEEE Std. 1149.1 very well might have been your father’s JTAG, since it has been around since 1990. For over 20 years, this standard has been in use throughout the world (boundary-scan description language, or BSDL, wasn’t added until 1993). It was revised in 2001 with only incremental improvements and no real major rewrites—until now. With the new 1149.1-2013 and the upcoming release of IEEE Std. P1687, huge changes and unmistakable momentum are on the horizon, promising to once again revolutionize the industry...
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