Using Xilinx Foundation Series Software:

Function Simulation In the Waveform Viewer

  1. In the Project Manager window select SIM Funct (Functional Simulation). The empty Logic Simulator and Waveform Viewer windows should now be open. Note: The schematic has to be completed before this step. See Using Xilinx Foundation Series Software: Schematic Entry.
  2. Signals must be added to the Waveform Viewer so they can be simulated. In the Signal menu, select Add Signals. All the signals and probes will be presented in this window. Select the important signals to view by holding down Ctrl and then Clicking on each signal that you wish to add, then Click Add. Click on Close. The Waveform Viewer window should now list the signals you chose.



  3. You must now apply stimulus to the input signals. In the Signal menu, select Add Stimulators. The Stimulator Selection window will now appear with a keyboard, clocks, and counters. We will use the counter because it will go through every possible input value automatically. The counter is labeled Bc (Binary Counter). To assign the 0 bit (B0) of the counter to the first input in your design, you should select the signal in the Waveform Viewer by clicking on it, it will be highlighted. Then click on the 0 bit in the counter and the signal will now be assigned to that (B0) value of the Bc for the duration of the simulation. B0 should appear in the column next to the signal name in the Waveform Viewer window. Assign each input signal to a different bit in the Bc. Click Close. Note: DO NOT apply stimulus to the Outputs.



  4. The speed of the Bc must be changed before simulation. In the Options menu, select Preferences. In the Clocks section of the Preferences window change the B0 clock frequency to 50MHz. Click OK.



  5. You are now ready to simulate your design. In the small Simulator window select Step . Waveforms should now appear that correspond to each signal that is being viewed. Black waveforms are for inputs, blue waveforms are for outputs.



  6. Step the simulation forward a couple of steps and observe the waveforms.


See Using Xilinx Foundation Series Software: Functional Simulation in the Schematic Editor.
Download a Text only printable version of these instructions (Word 95 7.0): WaveformSimulate.doc
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