When s 1x1 outputs the value ofy and x0outputs low

• When s = 1, x1 outputs the value of y , and x0 outputs LOW.
TODO (pre-lab): Fill in a truth table for the demultiplexer.
s y x0 x1
0 0
0 1
1 0
1 1
2
sending
mux
demux
receiving
conversation
a
y conversation
a
conversation
B
y
conversation
B
conversation
c
y conversation
c
conversation
is
y conversation
is
conversation
c y
conversation
e
conversations
r conversations
6
inputs
6
outputs
0
O
l O
0
O
O
I

CPSC 121 Lab 4
TODO (pre-lab): Provide a circuit diagram for a 1-to-2 demultiplexer repre-
sented by the truth table above .
Your diagram should use specific gates, it should NOT be the symbol shown below.
The symbol for a 1-to-2 demultiplexer looks like the opposite of a multiplexer:
In the previous lab, you saw that you could make a 1-of-4 multiplexer out of three 1-of-2
multiplexers.
TODO (pre-lab): Provide a diagram of how you could make a 1-to-4 demulti-
plexer using 1-to-2 demultiplexers (the symbol shown above). Your 1-to-4 demul-
tiplexer will have 4 outputs: x0 , x1 , x2 , and x3 . The table below shows which output returns
the value of y for di ff erent values of select1 and select0 . Your diagram must agree with the
table.
D
xo
D
x
select1 select0 output that returns y
0 0 x0
0 1 x1
1 0 x2
1 1 x3
3
Do
D
oxo
Do
D
X
D
0
2
D
0
3