Modelsim simulation steps
#MODELSIM SIMULATION STEPS SIMULATOR#
Optional.Īdvances the simulator the appropriate number of timesteps corresponding to 10.4 milliseconds. Specifies that VHDL procedures, functions and Verilog tasks are to be executed but treated as simple statements instead of entered and traced line by line. Create a new folder and copy the design (counter.vhd) and testbench (counttb.vhd) shown above. In previous labs, you may have used some of these commands to force inputs to a particular value or run the simulation. In essence, DO files contain a list of commands that are run in the ModelSim command prompt. Steps the simulator to the next HDL statement. Pre-Synthesis Simulation This section details the steps required for pre-synthesis simulation. How DO files Work DO files are essentially a very basic scripting language for ModelSim. Optional.Ĭauses the simulator to run to the next event time. A run -continue command may be input manually or used as the last command in a bp command string. Optional.Ĭontinues the last simulation run after a step command, step -over command or a breakpoint. For now, let’s wrap up by ending the simulation and closing the project. We’ll do just that in the upcoming lessons. Time steps and time units may also be set with the RunLength and UserTimeUnit variables in the modelsim.ini file.Ĭauses the simulator to run the current simulation forever, or until it hits a breakpoint or specified break event. EE 108 Digital systems I Modelsim Tutorial Winter 2002-2003 sur 14 At this point, you would generally run the simulation and analyze or debug your design. The only one of those intermediate steps that I've tried is the last one, 'Timing Simulation Post-Place and Route'. It describes various points during synthesis and routing where you can run a simulation. See "Setting default simulation options". Try the ISE 'Synthesis and Simulation Design Guide', chapter 'Simulating Your Design', section 'Simulation Points in HDL Design Flow'. The default and specifications can be changed during a Model Sim session by selecting Options > Simulation (Main window).
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In addition, optional may be specified as: The number may be fractional, or may be specified absolute by preceding the value with the character Optional. Specifies the number of timesteps for the simulation to run. Notice that the testbenchout signal is undefined before the reset pulse (yellow cursor line) because the acculumator signal has not been initialized yet. (click to enlarge) The following image shows the modelsim wave interface (click to enlarge) The wave viewer zoomed in. The run command advances the simulation by the specified number of timesteps. The following images shows the modelsim interface after the 10 steps above.