Building a Lift Operational Logic Circuit in Logisim

Running head: COMPUTER SYSTEMS AND NETWORKS
COMPUTER SYSTEMS AND NETWORKS
Name of the Student
Name of the University
Author Note

COMPUTER SYSTEMS AND NETWORKS1
Introduction:
The main objective of this particular assignment is to build a lift operational logic circuit in
Logisim. The logic circuit has two inputs, namely C and D which has values in the range of 0
to 7 representing the floor numbers. Floor 0,4 and 6 are known to be private floors and the
operation of the lift from or to the private floors are restricted. Additionally, the lift does not
move when starting and destination floors are same. This is modelled by a Successful LED
light in the circuit. The LED is ON when lift movement is possible and the LED is OFF when
the lift movement is restricted. The input C and input D are modelled by C1,C2,C3 and
D1,D2 and D3 respectively with each having one bit.
Representation table of input C and D:
Successful operations from C to D:
1 to 2, 2 to 1, 1 to 3, 3 to 1, 1 to 5 , 5 to 1, 1 to 7, 7 to 1, 2 to 3, 3 to 2, 2 to 5, 5 to 2, 2 to 7, 7
to 2, 3 to 5, 5 to 3, 3 to 7, 7 to 3, 5 to 7, 7 to 5
Truth Table representation of C and D for Successful operation:
C1 C2 C3 D1 D2 D3 Successful

COMPUTER SYSTEMS AND NETWORKS2
Operation (S)
0 0 1 0 1 0 1 to 2
0 1 0 0 0 1 2 to 1
0 0 1 0 1 1 1 to 3
0 1 1 0 0 1 3 to 1
0 0 1 1 0 1 1 to 5
1 0 1 0 0 1 5 to 1
0 0 1 1 1 1 1 to 7
1 1 1 0 0 1 7 to 1
0 1 0 0 1 1 2 to 3
0 1 1 0 1 0 3 to 2
0 1 0 1 0 1 2 to 5
1 0 1 0 1 0 5 to 2
0 1 0 1 1 1 2 to 7
1 1 1 0 1 0 7 to 2
0 1 1 1 0 1 3 to 5
1 0 1 0 1 1 5 to 3
0 1 1 1 1 1 3 to 7
1 1 1 0 1 1 7 to 3
1 0 1 1 1 1 5 to 7
1 1 1 1 0 1 7 to 5
K-MAP of SOP form:
D1D2D3