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The problem of determining a minimal number of control inputs for converting a programmable logic array (PLA) with undetectable faults to crosspoint-irredundant PLA for testing has been formulated as a nonstandard set covering problem. By representing subsets of sets as cubes, this problem has been reformulated as familiar problems. It is noted that this result has significance because a crossp
minimal number; control inputs; control inputs; programmable logic array; PLA; set covering problem; crosspoint-irredundant PLA; testable PLA; fault coverage; testability; cellular arrays; logic design; logic testing; minimisation of switching nets.

K. Ramanatha and N. Biswas, "Design of Crosspoint-Irredundant PLAs Using Minimal Number of Control Inputs," in IEEE Transactions on Computers, vol. 37, no. , pp. 1130-1134, 1988.
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