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Definition of "Don't Care Term" |
In digital logic, a don't-care term for a function is an input-sequence (a series of bits) that is known never to occur. The designer of a logic circuit to implement the function need not care about such inputs, but can chose the circuit's output arbitrarily, usually such that the easiest circuit results (minimization). Examples of don't-care terms are the binary values 1010 through 1111 (10 through 15 in decimal) for a function that takes a binary-coded decimal (BCD) value, because a BCD value never takes on such values, in the pictures, the circuit computing the lower left bar of a 7-segment display can be minimized to a b + a c + a d by an appropriate choice of circuit outputs for dcba=1010...1111. |
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