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# ECE 275 Homework 2

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Homework 2
Max marks: 110

Row x1 x2 x3 f
0 0 0 0 0
1 0 0 1 1
2 0 1 0 1
3 0 1 1 0
4 1 0 0 1
5 1 0 1 0
6 1 1 0 0
7 1 1 1 1
Table 1: Truth table for a 3-way light switch
1 Sept 10th Lecture
Problem 1 If the SOP form for ¯f = AB¯C¯ +
A¯B¯, then give the POS form for f. [10 marks]
Problem 2 Use DeMorgan’s Theorem to find f
if ¯f = (A + BC)D + EF. [10 marks]
Problem 3 Implement the function in Table 1
using only NAND gates. [10 marks]
Problem 4 Implement the function in Table 1
using only NOR gates. [10 marks]
2 Sept 13th Lecture
Problem 5 Find the minimum-cost SOP and
POS forms for the function f(x1, x2, x3) =
m(1, 2, 3, 5). [1, Prob 2.37] [10 marks]
Problem 6 Find the minimum-cost SOP and
P
POS forms for the function f(x1, x2, x3) =
m(1, 4, 7) + D(2, 5). [1, Prob 2.38] [10 marks]
Problem 7 Find the minimum-cost SOP and
Q
POS forms for the function f(x1, x2, x3, x4) =
M(0, 1, 2, 4, 5, 7, 8, 9, 10, 12, 14, 15). [1, Prob
2.39] [10 marks]
Problem 8 Find the minimum-cost SOP and
POS forms for the function
P
f(x1, x2, x3, x4) =
m(0, 2, 8, 9, 12, 15) + D(1, 3, 6, 7). [1, Prob
2.40] [10 marks]
Problem 9 Derive a minimum-cost realization
of the four-variable function that is equal to 1 if
exactly two or exactly three of its variables are
equal to 1; otherwise it is equal to 0. [1, Prob
2.46] [10 marks]
Problem 10 Find the minimum-cost SOP and
POS forms for the function
P
f(x1, . . . , x5) =
m(0, 1, 3, 4, 6, 8, 9, 11, 13, 14, 16, 19, 20, 21, 22, 24, 25)+
D(5, 7, 12, 15, 17, 23). [1, Prob 2.42] [10 marks]
References
 S. Brown and Z. Vranesic. Fundamentals of
Digital Logic with Verilog Design: Third Edition. McGraw-Hill Higher Education, 2013.
1 ECE 275 Homework 2
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