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Design of Totally Fault Locatable Combinational Networks

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2 Author(s)
Goundan, A. ; General Electric Company, Department of Ground Systems ; Hayes, J.P.

The design of combinational logic networks is considered in which equivalent or indistinguishable stuck-type faults are confined to a small region of the network. A general type of fault equivalence called S-equivalence is introduced, which defines fault equivalence with respect to an arbitrary set of modules S. A network N is called totally fault locatable with respect to module set S, denoted TFLS, if all specified faults in N are S-equivalent. Some general structural properties of TFLS networks are derived. The problem of designing TFLS networks is investigated for S = {AND, OR, NAND, NOR, NOT} denoted AON, and S = {AON, EXCLUSIVE- OR} denoted AONE. All equivalent fault classes in TFLAON and TFLAONE networks can be identified by inspection. It is shown that every function has a TFLAONE network, that is, a realization where all equivalence classes can be identified by inspection, containing at most one control point or extra input. A method for constructing a TFLAONE realization of an arbitrary function is presented using at most one control point.

Published in:

Computers, IEEE Transactions on  (Volume:C-29 ,  Issue: 1 )

Date of Publication:

Jan. 1980

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