To see the results of the simulation, open the wave window by typing You can run the simulation using the run Now all that is left to do is to run and view the simulation. The compliment command of force is noforce To continue with your simulation,įorce i0 0 0 force i1 1 0 force i2 1 0 force i3 0 0įorce Sel 00 0 force Sel 01 50 force Sel 10 100 force Sel 11 150 To create clock signals using the -repeat option.Ĭonsult the ModelSim command reference, found in the help section,įor examples of clock forces. If no option is used, ModelSim defaults to In ModelSim theĬommand performs this task. For your simulation,Īfter signals have been added to the wave file, you must nextįorce them to run a meaningful simulation. Common options areįor their specific usage and more options. Optional arguments to format the display. With the add wave command you can also pass i*, which would include the signals i0, i1,Įtc. Signal argument can take the form of a UNIX wildcard string, This isĪccomplished with the add wave command. The next step is to add signals to the waveform. If you do not specify a library name, ModelSim will look for Multiplexer, type the following in the ModelSim command window. With the vsim command that starts ModelSim from the Previous section using only command line functions. You will now recreate the simulation you performed in the Will cover some of the most commonly used commands. ModelSim help documentation, but for purposes of this tutorial we ModelSim remedies this by providing a long Manually force a signal using the graphic interface each time you When simulating large designs, it is often too cumbersome to Clicking it will add another cursor to the design as Find the Add Cursor button in the wave window ModelSim makes it easy to compare the value ofĪ signal at different times by using two cursors. The Find next transition and Find previous transition buttons, you canĪlso advance the cursor automatically to the next value change forĪ selected signal. You can drag the cursorĪlong the simulation timeline to examine signal values. Inputs by switching to the signals window, applying new forces,Ĭlicking in the waveform window will bring up a cursor, which The Run button again will run the simulation from the previous Will run the simulation for the default time of 100ns. Navigate back to the waveform window and find the When forcing Sel, be sure to enter a two digit binaryĪfter forcing all the input signals, the design is ready for Repeat this step for all the input signals i0-i3Īnd Sel. Set the value of the signal by entering eitherĪ 1 or 0 in the Value field and then select the Freeze option in Highlight the signal i0 and then select Edit -> Force. Open a new window that contains a list of all the signals in theĬurrent simulation. Now you will add forces to the input signals so that you can Module has only single wire inputs we will leave all signals in The Radix option allows you to change the displayįormat of the signal. In larger designs it is useful to examine theseĬhoose a signal in the wave window and right click to view You will notice that the internal wires s0 and s1 are Open a new "wave" window with the mux4_1 signals already Open the sim tab, right click on the mux4_1 module, In the current simulation, and the Files tab lists the sourceįiles used. The sim tab will contain a hierarchy of modules used This will create two new tabs in the Workspace window named simĪnd Files. Select the top-most design in your project, in thisĬase mux4_1, right click over the name, and choose Simulate. Expand this row to find yourĭesign files. There you will find the library you justĬreated named "cs552_tutorial". To simulate a design you must first locate your working Be aware, however, that due to the size of ModelSimĪ remote connection through SSH may be too slow for your liking. UNIX/Linux machines or through an SSH connection to a CS ModelSim can be accessed through any of the CS You will learn best from this tutorial by following along on Those lookingįor more detailed coverage can consult the ModelSim SE tutorialĪdditionally, the help menu in ModelSim has a large volume ofĭocumentation covering the features of the IDE. Tools necessary to complete coursework in CS 552. This document will provide a only brief introduction to the Work done for the CS 552 project and homework, found in the Before using ModelSim for your ownĭesigns be sure to review the Verilog style rules that apply to In CS 552 we will use ModelSim to develop and simulate circuitĭesigns written in Verilog. Integrated Development Environment (IDE) for HDL circuit design. This tutorial covers Mentor Graphic's ModelSim SE©, an
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