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At-speed test has become a requirement in IC technologies below 180 nm. Unfortunately, test mode switching activity and IR-drop present special challenges to the successful application of structural at-speed tests. In this paper we characterize these problems on commercial ASICs in order to understand how to implement more effective solutions.
It is a well-known phenomenon that test power consumption may exceed that of functional operation. ICs have been observed to fail at specified minimum operating voltages during structured at-speed testing while passing all other forms of test. Methods exist to reduce power without dramatically increasing pattern volume for a given coverage. We present case(More)
The SEMATECH " Test Methods Evaluation " study, Project Number S-121, is an experiment to determine the relative merits of several test methodologies often used by SEMAT-ECH member companies and other IC manufacturers. Conclusions drawn from the experiment thus far have indicated that each test methodology uniquely detects defects. This-experimentation and(More)
EEective bridging fault diagnosis requires reducing the , n 2 number of bridging faults to a handful of candidates. A preliminary step can reduce the On 2 candidates to a manageable On candidates by using layout information to eliminate those bridging faults that are very unlikely to be shorted together. This step removes from consideration those faults(More)
—At-speed testing is becoming crucial for modern very-large-scale-integration systems, which operate at clock speeds of hundreds of megahertz. In a scan-based test methodology , it is common to use a transition delay fault model for at-speed testing. The launching of the transition can be done either in the last cycle of scan shift [launch-off-shift (LOS)],(More)