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7.2 - The following schematic may clarify this concept...

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MULTIMODE COMPLEX LOGIC CIRCUIT – ARITHMETIC UNIT Please note that the unit that selects the output result is usually a DECODER which has n-input select lines and 2 n outputs lines. A decoder has the property that only one of its outputs is active at a time, and, therefore, it can be used to enable the unit or subunit that produces the function corresponding to the input value of the input select lines.
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Unformatted text preview: The following schematic may clarify this concept. Decoder Output ID Select lines S0 S1 S2 Function to be performed 0 0 R = A + B 1 0 0 1 R = A - B 2 0 1 R = !A 3 0 1 1 R = !B 4 1 0 R = !A + !B 5 1 0 1 R = A x 2 6 1 1 R = A x 4 7 1 1 1 R = A x 8 ARITHMETIC LOGIC UNIT S0 S1 S2 DECODER A B R / 4 / 4 / 4 0 1 2 3 4 5 6 7...
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