Joint Test Action Group (JTAG) is the common name for what was later standardized as the IEEE 1149.1 Standard Test Access Port and Boundary-Scan Architecture. It was initially devised for testing printed circuit boards using boundary scan and is still widely used for this application.
Today JTAG is also widely used for IC debug ports. In the embedded processor market, essentially all modern processors implement JTAG when they have enough pins. Embedded systems development relies on debuggers communicating with chips with JTAG to perform operations like single stepping and breakpointing. Digital electronics products such as cell phones or a wireless access point generally have no other debug or test interfaces.
Read more about Joint Test Action Group: Overview, Electrical Characteristics, Communications Model, Example: ARM11 Debug TAP, Common Extensions, Widespread Uses, Client Support, Serial Wire Debug
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“What’s a joint of mutton or two in a whole Lent?”
—William Shakespeare (1564–1616)
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—Robert Fitzgerald (1910–1985)
“In the life of the human spirit, words are action, much more so than many of us may realize who live in countries where freedom of expression is taken for granted. The leaders of totalitarian nations understand this very well. The proof is that words are precisely the action for which dissidents in those countries are being persecuted.”
—Jimmy Carter (James Earl Carter, Jr.)
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—Ralph Waldo Emerson (1803–1882)