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k. Half Subtractor Activity

# k. Half Subtractor Activity - HALFSUBTRACTOR Name Purpose...

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HALF SUBTRACTOR  Name: ___________________ Purpose: To build a half subtractor circuit that will accept a two-bit input and give the binary difference and borrow digit as the output. Theory: To subtract two single binary digits, the answer will consist of the difference and a borrow of 0 or 1. See textbook p253. A B Y X Procedure: Draw your wiring on your breadboard simulator before you wire it on the breadboard. (Don’t forget your labels) Save it on a disk Include a printout of a MM Logic circuit diagram. //home/vdimitrov/32008/e165f49357f94a97a44ec1b13798c7bb0807169a.doc Page 1 of 3

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Results: Complete the Truth Table A B X Y 0 0 0 0 0 1 1 1 1 0 0 1 1 1 0 0 Conclusion: 1. What do A and B represent? A and B are the inputs of the Half-Subtracter. 2. What do X and Y represent? The x and the y values are the outputs for the Half-Subtracter. (y = Value, x = Carry) Questions: 1. In terms of inputs A and B, give the Boolean equations for (a) X = ( A + EOR B) * B (b) Y = A + EOR B 2. Explain why X and Y are both high when A is 0 and B is 1.
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