BYU, ECEn/CS 124, W2012
Homework #2
Page 1/2
CS/ECEn 124, W2012
Homework #2
Digital Logic (Ch 3)
Name
Section
Score
/ 38
Questions:
Answers:
1. (4 points) How many select lines and how
many output lines do the following multiplexers
have?
a.
32input multiplexer
b.
16input multiplexer
c.
5input multiplexer
d.
3input multiplexer
# of input lines
# of select lines
# of output lines
32
16
5
3
2. (10 points) Compute the following bitwise
logical/arithmetic operations given the following
2’s complement values of
A
and
B
?
A
= 0111 0101 0111 0110
B
= 0001 1100 0101 0000
a.
NOT
A
b.
NEG B
c.
A
OR
B
d.
A
AND
B
e.
A
NOR
B
f.
A
NAND
B
g.
A
XOR
B
h.
A
ADD
B
i.
A
–
B
j.
A
AND
B
OR NOT
A
a.
b.
c.
d.
e.
f.
g.
h.
i.
j.
3. (3 points) Give a truth table for each of the
following equations:
a.
f =
b
a
+
b.
f =
b
a
+
c.
f =
b
a
×
Note: + = OR,
×
= AND, – = NOT
a
b
f
a
b
f
a
b
f
4. (4 points) What is the Boolean expression for
the following combinatorial circuit?
(Use ~,
×
,
and
+
for NOT, AND, and OR respectively.)
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BYU, ECEn/CS 124, W2012
Homework #2
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5. (5 points) Draw a logic circuit (using N and P
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 Winter '09
 Electronics, Logic gate, switch, select lines, logic circuit

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