Question

Draw the truth table for the full subtractor having A B and Borrow as inputs and...

Draw the truth table for the full subtractor having A B and Borrow as inputs and Difference and Bout as outputs. Follow the steps you used for the full adder to come up with this table. Design a circuit to implement the truth table using simplified SOP. Use only AND, OR and NOT gates.

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Answer #1

1) Truth Table :

X Y Bin D Bout
0 0 0 0 0
0 0 1 1 1
0 1 0 1 1
0 1 1 0 1
1 0 0 1 0
1 0 1 0 0
1 1 0 0 0
1 1 1 1 1

2) K-map for D :

  

  

  

  

K -MAP for Bout :

3)   

I have tried to explain it in very simple language and I hope that i have answered your question satisfactorily.Leave doubts in comment section if any.

  

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