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JTAG
The IEEE-1149.1 standard, also
known as JTAG or boundary-scan, has for many years provided an
access method for testing printed circuit board assemblies,
in-system-programming, and more. But what is JTAG, and how can
it be used to benefit organizations in diverse industries across
all phases of the product life cycle?
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While
originally developed to address the needs of testing printed
circuit board assembly (PCBA) interconnects, JTAG test methods
can be used to address many needs beyond simple structural test.
This overview will briefly examine popular types of JTAG tests
and applications. |
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This
technical primer provides a brief overview of JTAG
devices--basic chip architecture, essential capabilities, and
common system configurations. The basic properties of the
boundary-scan description language (BSDL) are also covered.
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This
technical primer provides a brief overview of JTAG
devices--basic chip architecture, essential capabilities, and
common system configurations. The basic properties of the
boundary-scan description language (BSDL) are also covered.
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New
developments and applications of the IEEE-1149.1 standard have
enabled the use of JTAG in many other product life cycle phases.
This tutorial describes how JTAG technology is now applied to
product design, prototype debugging, and even field service,
allowing the cost of JTAG tools to be amortized over the entire
product life cycle. |
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The earlier a mistake or a defect can be detected in the
design phase or in the production process, the less
money it will cost to remedy it and the sooner the
product will be ready for production or shipment.
Therefore, a good Design-For-Test (DFT) strategy is
needed for the design, prototype and production phase of
a product.
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Summary
JTAG is a widely practiced test methodology that is
reducing costs, speeding development, and improving product
quality for electronics manufacturers around the world. By
relying on an industry standard, IEEE 1149.1, it is
relatively quick, easy, and inexpensive to deploy a highly
effective test procedure. Indeed, for many of today's PCBs,
there is little alternative because of limited access to
board-level circuitry. This paper highlights just some of
the potential applications of the JTAG standard in
various stages of the product life cycle, each contributing
to the overall effect of significantly reduced product
development and support costs.
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Corelis Education
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Corelis
offers free
three-day training classes that include a boundary-scan tutorial and
hands-on lab exercises using Corelis ScanExpress hardware and software.
The training class covers all aspects of boundary-scan testing using
Corelis ScanExpress tools. |
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