ECE 200 Fundamental of Intelligent Systems
Drexel University
Summer 2004-2005
Homework #5
Mano Text:
1) 4-17 (try to get help/hints from looking at Figure 4-16)
2) 4-22 (Represent all three function using only one 3x8 decoder)
3) 4-23 (a truth table for the binary full adder is in Table 5-2. In this case, Z in the
“Carry-in” bit)
4) 4-24
5) 4-26
Other Problems:
6) Fill out a truth table for the following circuit. Note that the blocks are 2x1
multiplexers.
A
I0
C
I1 S
Y
Out
I0
Y
I1 S
B
I0
D
I1 S
Y
S1
S0
7) Determine the values of A?, B?, C?, D?, E?, F?, G? and H?, such that the
value “Z” is placed onto the 1-bit bus line, F. For the 2x4 decoders, B is the most
significant bit (MSB). For the 8x3 encoder (this is not a priority encoder, therefore
one and only one input should be asserted), I7 is the MSB input and Y2 is the
MSB output. Give the values as 0, 1, or X (don’t care). Use don’t cares when
they are valid. Give reasoning for your choices.
D?
I0
I1
A?
E?
En
A
B
O0
O1
O2
O3
En
A
B
O0
O1
O2
O3
S
0
B?
0
F?
G?
1
0
I0
I1
I0
I1
I2
I3
I4
I5
I6
I7
X
Y0
Y1
Y2
Y
I0
I1
S
Z
H?
S
C?
F