Computational complexity of controllability/observability problems for combinational circuits

The computational complexity of fault detection problems and various controllability and observability problems for combinational logic circuits are analyzed. It is shown that the fault detection problem is still NP-complete even for monotone circuits limited in fanout, i.e. the number of signal lin...

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Vydáno v:International Symposium on Fault-Tolerant Computing, 18th, 1988 (FTCS-18): Digest of Papers s. 64 - 69
Hlavní autor: Fujiwara, H.
Médium: Konferenční příspěvek
Jazyk:angličtina
Vydáno: IEEE Comput. Soc. Press 1988
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ISBN:9780818608674, 0818608676
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Abstract The computational complexity of fault detection problems and various controllability and observability problems for combinational logic circuits are analyzed. It is shown that the fault detection problem is still NP-complete even for monotone circuits limited in fanout, i.e. the number of signal lines which fanouts from a signal line is limited to three. It is also shown that the observability problem for unate circuits is NP-complete, but that the controllability problem for unate circuits can be solved in time complexity O(m), where m is the number of lines in a circuit. Furthermore, two classes of circuits, called k-binate-bounded circuits and k-bounded circuits, are introduced. For k-binate-bounded circuits, the controllability problem is solvable in polynomial time, and for k-bounded circuits, the fault detection problem is solvable in polynomial time, when k<or=log p(m) for some polynomial p(m). The class of k-bounded circuits includes many practical circuits such as decoders, adders, one-dimensional cellular arrays, two-dimensional cellular arrays, etc.< >
AbstractList The computational complexity of fault detection problems and various controllability and observability problems for combinational logic circuits are analyzed. It is shown that the fault detection problem is still NP-complete even for monotone circuits limited in fanout, i.e. the number of signal lines which fanouts from a signal line is limited to three. It is also shown that the observability problem for unate circuits is NP-complete, but that the controllability problem for unate circuits can be solved in time complexity O(m), where m is the number of lines in a circuit. Furthermore, two classes of circuits, called k-binate-bounded circuits and k-bounded circuits, are introduced. For k-binate-bounded circuits, the controllability problem is solvable in polynomial time, and for k-bounded circuits, the fault detection problem is solvable in polynomial time, when k<or=log p(m) for some polynomial p(m). The class of k-bounded circuits includes many practical circuits such as decoders, adders, one-dimensional cellular arrays, two-dimensional cellular arrays, etc.< >
Author Fujiwara, H.
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PublicationTitle International Symposium on Fault-Tolerant Computing, 18th, 1988 (FTCS-18): Digest of Papers
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Snippet The computational complexity of fault detection problems and various controllability and observability problems for combinational logic circuits are analyzed....
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SubjectTerms Adders
Circuit faults
Circuit testing
Combinational circuits
Computational complexity
Controllability
Decoding
Electrical fault detection
Observability
Polynomials
Title Computational complexity of controllability/observability problems for combinational circuits
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