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What is JTAG Boundary-Scan?

The world standard (IEEE-1149.1) method for high speed automatic testing of circuit boards/systems.

Detect/isolate circuit board trace opens/shorts, dead/missing devices in seconds, without special fixtures.

Program and/or validate non-volatile storage devices in a circuit, for initialization or upgrading.

Test functionality at full-speed, via the circuit CPU processor's diagnostic portal.

Field integrity testing/monitoring/upgrading of installed systems.

Embedded software development debugging methods (emulation).

Accomplish Board Level Hardware Debugging.

Corelis is the premier provider of JTAG software and hardware tools covering the entire spectrum of these capabilities.

JTAG, as defined by the IEEE Std.-1149.1 standard, is an integrated method for testing interconnects on printed circuit boards (PCBs) that are implemented at the integrated circuit (IC) level. The inability to test highly complex and dense printed circuit boards using traditional in-circuit testers and bed of nail fixtures was already evident in the mid eighties. Due to physical space constraints and loss of physical access to fine pitch components and BGA devices, fixturing cost increased dramatically while fixture reliability decreased at the same time.

JTAG Boundary-Scan Whitepaper
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JTAG Tutorial
http://www.corelis.com/education/JTAG...