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FOR
IMMEDIATE RELEASE
Contact:
Wendy Harrison
Flynn Systems
Corp.
74 Northeastern Blvd
Nashua, NH 03062 USA
603-598-4444
Sales@flynn.com
onTAP®
Boundary Scan Software
Catches Hard to Detect Resistor Network Faults
Nashua, NH, May 12, 2005 - Flynn Systems announced the
official release of the onTAP Boundary Scan RESISTOR NETWORK
SHORTS DETECTION AND DIAGNOSIS algorithm.
Responding to the serious problems presented in newer technology
printed circuit boards employing lower threshold voltages, Flynn
Systems has developed its own unique algorithm to address the
issue of Resistor Network Shorts. Resistor Network Shorts faults
refer to short-circuit conditions where a resulting voltage
level is "mid-state" rather than a hard logic one
or zero level.
The tests are relatively compact and similar to Wagner patterns,
allowing onTAP to check and see if the capture values on tri-stated
nets follow low/high values asserted on actively driven nets.
In addition to running the Resistor Network Shorts detection
patterns included in an SVF file, onTAP also produces additional
scans at run time to confirm any nets that have been indicted
by the Resistor network shorts test.
If a boundary scan user is uncertain as to whether his current
JTAG tool is detecting Resistor Network Shorts, a simple test
will help make that determination.
Place a short across several pins on a resistor network where
the other side of the resistors connect to boundary scan I/O
pins, but those boundary scan I/O pins are not present directly
on the nets of the shorted pins. Now run your interconnect test.
You may be surprised that you do not detect the short circuit.
Why? The reason is simple. Shorts algorithms work by driving
nets to opposing values and then testing to see which ones are
failing. In this case, however, if bidirectional pins P1 and
P2 drive their nets to opposite values, both pins will capture
the correct expected values because they are isolated from the
fault by the resistors.
Flynn Systems provides users of its automatic test generation
software red-carpet service. Flynn Systems designs Boundary
Scan software easy enough for everyone to use, from the person
with no JTAG knowledge to the JTAG guru; and provides the same
high level of customer service, and high-quality guarantee for
every user. The software is simple enough for first time users
to create and run tests within minutes, yet robust enough to
accomplish and fill every Boundary Scan need.
(onTAP is a registered trademark of Flynn Systems.
All other trademarks are property of their respective owners.)
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