1. Solve for the Boolean expression of 4-bit binary Adder and 4-bit binary subtractor. : The Block diagram below shows 4-bit binary adder and 4-bit
1. Solve for the Boolean expression of 4-bit binary Adder and 4-bit binary subtractor. : The Block diagram below shows 4-bit binary adder and 4-bit binary subtractor. Notice in
figures Ao and Bo has two input variables.
(MSB)
Az Bz
A B
(LSB)
Ap
Bo
A3 By
4-bit addition:
AB C
AB C
AB C
bit representations
A
В
A3 Az Aj Ag
+ B, B2 Bị Bo
FA
FA
FA
НА
Co
Σ
Co
Σ
C.
Σ
C,
Σ
Figure 1: Arithmetic Adder for four 4-bit binary numbers
Number A
Number B
1’s complememt
of B
A.
A.
B.
B.
В.
B.
+V.
4 bit parallel binary adder
Result of subtraction
Figure 12: Arithmetic Subtrator for four 4-bit binary numbers
4,
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