Assignment 5 Logisim
Download the Logisim-evolution logic simulator. Logisim is an open-source digital logic circuit
design and simulation software written in Java. We will be a revised version called Logisim-evolution.
You can download it from this link:
http://www.cburch.com/logisim/download.html
1.
Getting started with the Logisim Tutorial
First, start the logisim simulator. Then click on the Help dropdown menu in the Menu bar. You will
see three help topics: Tutorial, User’s Guide and Library Reference.
Click on Tutorial and go over Steps 0-5. Make sure you understand how to:
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Add logic gates
Find and wire the gates
Add and manipulate input and output pins
Use the analyzer tool
By the end of the tutorial, you would have a circuit model of an XOR gate.
Click on Project -> Analyze Circuit you can see your Truth Table and Expression matches the ones
below:
2.
Simulating Half Adder with Logisim
Implement a circuit with two outputs for a half adder using the following truth tables. Use only AND,
OR, and NOT gates for the logic part of the circuit. Use Pins for the input and outputs. Give each
input and output an appropriate label (which is property in the lower left corner; initially says “HDL
required”). Use only a single input pin for A and a single one for B, connected appropriately for both
outputs, S and C
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You can test that the circuits are working by changing your cursor to pointing-hand tool and clicking
on the inputs. If the output pins or any wires are blue, they are not attached to a value-producing part
of the circuit. If any wires are red, that means they are connected to two contradicting inputs. With
different inputs, you should see the correct output values.
You can also test your circuit by looking at the generated truth table. Click on Project -> Analyze
Circuit. Is the truth table correct? If not, fix your circuit.
Save your circuit as halfAdder.circ and submit a PDF file includes screenshots of your Canvas (circuit)
and Truth Table.