Tutorials:Cadence:VerilogSimulation

Verilog Simulation

Left click CIW:Tools → Verilog Integration → Verilog-XL. The Setup Environment windows should appear. Fill in the appropriate fields as shown in the figure. It is recommended that you run your simulation in the local /tmp directory on the machine. Usually your simulation will run faster.

Left Click OK.

A pop up window will appear. This window is called the Verilog-XL Integration Control window. Start the simulation process by first clicking on Setup → Record Signals in the Verilog-XL Integration window. Make sure to choose All Signals as shown below.

Left Click OK.

There are (for us) three very important buttons on the control panel. The two that are currently active (not grayed out) are Start Interactive in the upper left corner of the panel, and the View Waveforms button in the lower right corner of the panel. The third is the Continue button (currently grayed out) in the second row, second button of the panel. Next, click on the Start Interactive (top-left) button in the list of buttons provided in the Verilog-XL Integration Control Window or select Simulation → Start Interactive.

Click on the Stimulus → Verilog menu item. You will get the Stimulus Options window as shown below. Select the Edit button and press OK. This will help you create a stimulus file for the simulation of an inverter.

An Emacs window will appear. Modify the file as shown below:

The above stimulus file starts with the input inp = 0 and then changes to 1 at the time instant 25. Then it changes to 0 at 35 time instants later (25+35=60 time instants) and then to 1 at 75 instants (25+35+75=135 time instants) later. The simulation time is 235 units. The exact time of simulation is governed by the timescale command in the original functional view file.

Click on the Continue icon (second top icon in the second column) in the Verilog-XL Integration Control window or select Simulation → Continue. The Verilog simulation will begin. Pay attention to the messages that appear in the Verilog-XL Integration Control window to verify that the simulation is indeed running. You will be notified by those messages in the window when the simulation has finished.

Next click on the very bottom right icon (View Waveforms icon) or select Debug → Utilities → View Waveform. A pop up window will appear. It is the window in which you will view your simulation results and is called SimVision.

From top right part of the SimVision window, select Send to Browser icon (the icon with a magnifying glass). The following window should open.

Now select the waveforms that you want to plot. After you selected the waveforms, press the Send to Waveform button (It is located right next to the Send to Browser button.

The waveforms should be as follows:

Note: To see the complete waveform, please select View → Zoom → Out or the equality button right above the waveform window.

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