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, in a single zip file:
- The file with your VHDL code.
- A screen shot of your exhaustive simulation (wave window of Modelsim with all 8 cases).
- A screen shot of a successful compilation of your code (transcript window of Modelsim).
