COMP4300
Lab Exercise One
Objective
This lab is aimed at getting you familiar with using the ModelSim simulator. The circuits you will be
simulating should be familiar to you from ELEC2200.
Instructions
Write a VHDL program consisting of a single entity whose architecture is a single process that implements
a one-bit full adder . That is, a circuit which behaves as specified in the following truth table. You should
implement your architecture as a single process, like the AND gate implemented in class.
• inputs |outputs
• ----------------------------+---------------
• carry_in a_in b_in | result carry_out
• 0 0 0 | 0 0
• 0 0 1 | 1 0
• 0 1 0 | 1 0
• 0 1 1 | 0 1
• 1 0 0 | 1 0
• 1 0 1 | 0 1
• 1 1 0 | 0 1
• 1 1 1 | 1 1
Use exactly the names given above for the signals. All your signals should be of type bit (NOT
integer). Use a propagation delay of 10ns.
Deliverables
Please turn in the following things for this lab:
o The file with your VHDL code.
o A screen shot of your exhaustive simulation.
o A screen shot of a successful compilation of your code.
