Lecture Notes on the Use of Logic Works (Version 4) - Eagle.cs ...

Lab1:
Objective: To practice working on and be familiar with LogicWorks4. You will learn how to use the clock
and the trigger function, and how to read and interpret the timing window.
Problem: You are to modify the previous example at the end of the tutorial so it works automatically, not
depending on the input from the binary switches.
Procedure:
1- Delete the binary switches used in the example and replace them with 2 clock devices. The clock is in
under the Demolib.clf library.
2- Change the clocks period by going to the Simulation Params under the Simulation menu (refer to
section 4.4.4.) Set the period of the first clock (X) to a 100 ns for both high and low, and the period of
the second clock (Y) to 45 ns for both high and low.
3- If you haven’t done that already, name the first signal (X) and the second (Y). Be careful when you
name the signal you put the text cursor on the red wire, not the out pin of the clock. Once you’ve done
that, you will see the name of the signals in the timing window if it’s open (section 5.1.1.1) and if the
option Add Automatically under the Simulation menu. Name the output of the OR gate as (X xor Y).
Again, it should appear in the timing window.
4- Arrange your signals in the timing window so it shows X, Y, X xor Y respectively from top to bottom.
Right-click on the signal name in the timing window and use To Top or To Bottom options to arrange
them, or drag and drop.
5- Now that everything is in place, you may try to run the simulation by pressing on the Run Simulator
key in the simulation toolbar (section 5.1.3). The simulation will run very fast as you can see in the
Counter and the Timing Window. You may slow it down using the slidebar.
6- Stop the simulator and reset the simulator (section 5.1.1.6).
7- Since the simulation is repeated over and over again, it is enough to examine a portion of the time that
covers all the possibilities of the output and then stop the simulation. We can do that using the
Triggers function (section 5.1.1.3). Click on the Triggers button on the simulation toolbar, the
simulation Trigger window shows up.
8- In the Actions section check beside the Stop option. In the Timing Condition section choose “=” and
type 200 in the time box. Click OK. This means that if you reset the simulator and start from time t=0
the simulation will run until t = 200 ns and then stops.