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Issue No. 08 - August (1996 vol. 45)
ISSN: 0018-9340
pp: 950-963
<p><b>Abstract</b>—The testing properties of a class of regular circuits called convergent trees are investigated. Convergent trees include such practical circuits as comparators, multiplexers, and carry-lookahead adders. The conditions for the testability of these tree circuits are derived for a functional fault model. The notion of L-testability is introduced, where the number of tests for a <it>p</it>-level tree is directly proportional to <it>p</it>, rather than exponential in <it>p</it>. Convergent trees that are C-testable (testable with a fixed number of tests, regardless of the tree's size) are also characterized. Two design techniques are also introduced that modify arbitrary tree modules in order to achieve L- and C-testability. Finally, we apply these techniques to the design of a large carry-lookahead adder.</p>
Testability, design-for-testability, synthesis-for-testability, C-testability, test generation, regular circuits, iterative logic arrays, tree circuits, functional testing.

J. P. Hayes and R. (. Blanton, "Testability of Convergent Tree Circuits," in IEEE Transactions on Computers, vol. 45, no. , pp. 950-963, 1996.
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