Making predictions about the longevity of the single stuck-at fault model is a highly speculative yet nonetheless popular activit y in the IC test community, and has been for years. Despite the welldocumented analytical shortcomings of the SSA fault model as a physical model for defects, SSA fault coverage has yet to be replaced as the standard for test qualit y measurement. How can this be?

The purpose of implementation-based testing is to gain a measure of confidence in the correctness of the software by providing adequate coverage of the code. One unit of testing in object-oriented software is a class. However, classes use other classes and if class interactions form a cycle of dependencies then, to test a client class that uses an untested supplier class, stubs must be construc...

Stratified fault sampling is used in RTL fault simulation to estimate the gate-level fault coverage of given test patterns. RTL fault modeling and fault injection algorithm are developed such that the RTL fault list of a module can be treated as a representative fault sample of the collapsed stuck-at fault set of the module. The RTL coverage for the module is experimentally found to track the g...

As large-scale wireless networks continue to proliferate, a reliable way to test coverage and communicate requirements becomes increasingly important. In this paper we discuss concerns and provide guidelines to consider when developing a coverage testing methodology for large-scale wireless networks. We propose a method which complies with these guidelines and apply it to a large municipal mesh...

Testable software has two inherent properties – observability and controllability. Observability facilitates observation of internal behavior of software to required degree of detail. Controllability allows creation of difficult-to-achieve states prior to execution of various tests. In this paper, we describe COTT, a Controllability and Observability Testing Tool, to create testable object-orie...

In a quiet way, test methods have evolved. But now the test industry is fast approaching a tipping point where the older, intrusive, hardware-based test techniques must be complemented, supplemented, or outright replaced by newer, software-driven, nonintrusive test technologies. What’s driving this trend is what has always driven the test industry: test coverage. Without it, test engineers look...

This paper provides proof of concept for the newly-approved 1149.6 standard by investigating the first silicon implementation of the test receiver. EXTEST and EXTEST_PULSE tests were applied to functional channels as well as channels with a set of externally-induced hard defects. All valid signals were correctly received, and all defects were detected, thus validating both 1149.6’s anticipated ...

Configurations of adders and registers, which are available in tnany datapaths, can be utilized to generate pattems and to compact test responses. This paper unalyzes tlie patiern sequences produced by different types of accuriiulators and shows that they can achieve similar ,fault coverage as pseudo-random patterns. Corizpared to file well-known selftest tnethods that insert test registers, th...

The focus of this panel is the trade-off between excessive testing and acceptable shipped quality levels. How much testing is enough? We all strive to ship our customers high quality product, or at least product that meets our customers’ quality expectations. Often improvements in shipped quality levels can be made by plugging obvious holes in a device’s test suite, sometimes simply by increasi...

This paper investigates the degradation in diagnosability of bridging faults caused by situations of active feedback and logically unresolvable intermediate values under different fault modeling assumptions. The experimental results show that active feedback may reduce the fault coverage by as much as 7% for stuck-at test sets and realistic bridging fault sets. A test generation method for full...