ECE 2030B
Computer Engineering
Spring 2010
4 problems, 5 pages
Exam One Solutions
10 February 2010
1
Problem 1 (2 parts, 20 points)
Switch-level Design
The three parts below contain (A) a pull up network, (B) a pull down network, and (C) an
expression to be implemented.
For (A) and (B), complete the missing complementary switching
networks so the circuit contains no floats or shorts and write the Boolean expression computed
by the completed circuit.
For (C), design the entire switching network.
Assume the inputs and
their complements are available.
(A)
(B)
OUTx =
)
(
)
(
F
E
D
C
B
A
+
+
⋅
+
⋅
OUTy =
E
D
C
⋅
+
OUTz =
)
(
E
D
B
C
A
+
⋅
+
⋅
(C)

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