Revised January 28, 2013/GCC
CENG 3112 Digital Circuits Lab
Experiment 2: Implementing Two Level Forms
Purpose:
The purpose of this experiment is to understand and be able to implement two level forms as well as gain experience
in using Multisim and wiring circuits,
Prelab:
Design and implement the following function in both simplified product of sums and simplified sum of products forms.
f ( ABCD )   m(1,3,8,9,11,12,13,15)
Using a TTL data book, find the integrated circuit part numbers that will allow you to implement these functions. Use only two
input gates.
When you realize these circuits at the same time what do you expect the result to be? Verify your answer using truth tables.
Equipment:
Lab PC Running Multisim (for the simulations)
Ni Elvis for the Prototyping
Laboratory Procedure:
Part 1. Simulation
Using Multisim, construct a circuit that consists of the word generator and the logic analyzer. You will
find these under the "Instruments" button.
Set up:
Word generator:
Set the word generator to internal clocking with the frequency of 1 KHz. Select an initial address of 0000
and set the buffer to F (16 patterns will be generated.) . Set the pattern to count up. This will generate a timing diagram that
shows all possible combinations of the inputs.
Logic analyzer:
Set the logic analyzer to internal clocking with the frequency of l KHz and set the clocks per division to 2. Connect the outputs of
the word generator to the logic analyzer and run the simulation. Verify that the output is that of a mod 16 counter.
Implement the circuits that you designed in the Prelab section. (Note: The output of each two level form is connected to the logic
analyzer.) Run the simulation and print the logic analyzer output and put it in your lab book.
Part 2. Prototyping
Implement the circuits using the NI Elvis trainer and the components in the lab. Have a teaching assistant initial your lab book
when you have demonstrated a working circuit.
Conclusion:
In you lab book, discuss your observations and conclusions and briefly explain whether circuit simulation or actually constructing
the circuit is more supportive of your learning and understanding the material.