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HOW TO SHOW CIRCUIT IN MODELSIM ALTERA VERIFICATION
HOW TO SHOW CIRCUIT IN MODELSIM ALTERA CODE

See Figure 6.23īecause the result of the operation will be one clock cycle later than the input, the multiplier and the result will differ by one line, which does not seem to match, but does not affect the analysis of the experimental results.įigure 6.23 Text displays operation result Summary and Reflection See Figure 6.22.Īfter a certain delay, outputs will display in Transcript. Repeat previous step, to start ModelSim to simulate.Click OK (three times) to finish the setting. the red ellipse to add the test bench file.Make the name be consistent with tb file. In Compile test bench, click Test Benches to add tb simulation file.Set the testbench file: Assignments -> Settings.This simulation stops after 1000 clock cycles.Īfter the compilation, the testbench file is added to the ModelSim for simulation, the specific steps are as follows: When writing the testbench file, first mark the time unit of the simulation at the beginning, this experiment is 1 ns, then instantiate the project that needs to be simulated into the testbench file, define the clock cycle and the simulation conditions, and stop the simulation after a certain time. $monitor (“%d * %d = %d”, count, sw, mult_res) Define the clock required for the simulation and display the results in text form S1 is the instance of simulation module Method 2: Write a testbench file for simulation Since waveform editing efficiency is relatively low, the use of simulation testbench file is encouraged.

HOW TO SHOW CIRCUIT IN MODELSIM ALTERA CODE

The revised code is as follows： module pll_sys_rst(

Use external rst signal to procide reset.

In Figure 6.16, before PLL starts to lock, the sys_clk already has a rising edge, so PLL_locked signal is just converted from low to high.

Add pll_locked signal to the wave, and re-simulate.

Counter count does not have a valid result, instead, unknow result XXXXXX is gotten.

In the tool bar, set the simulation time to be 100 ns.

logical signals select Force and select Clock for clock signals.

Set the signals in Wave, right click any signal and a selection window will occur.

In the Objects window, choose all the signals and drag them to Wave window.

See Figure 6.8.įigure 6.8 Choose the project in simulation

Under Design tag, choose simulation project mult_sim and click OK.

In the popup window, add libraries under Libraries tag.

Tool -> Run Simulation Tool -> RTL Simulation.

Click the menu bar Tools -> Options, as shown in Figure 6.5, click OK.

Method 1: Simulation based on waveform input Here, use ModelSim to simulate verifing the experiment.

HOW TO SHOW CIRCUIT IN MODELSIM ALTERA VERIFICATION

Select the pipeline to speed up the operation, as shown in Figure 6.4.Ĩ×8 multiplier instantiation: reg sys_clk；Ħ.4 Use of ModelSim and the Experiment Verification.

Select the multiplication type to be Unsigned.After adding the LPM_MULT IP ( IP Catalog -> Library -> Basic Functions -> Arithmatic -> LPM_MULT) and saving the path, the setting window of the multiplier is popped up, as shown in Figure 6.2, and the two input data is set to eight bits as required.Step 2: The multiplier IP core setting steps are as follows: The value of the switch is used as the first input of the multiplier, the value of the counter is the second input, and the result of the calculation is output. The first step: the establishment of the main program framework module mult_sim ( Only one counter, one PLL and one multiplier are used in the program. ModelSim, different from the previous experiment, when building the project, you need to add the simulation tool to be used in the EDA tool selection window. Our program can be simulated to achieve inspection and error correction. ModelSim is an HDL language simulation software. Since learning uses of the simulation tools and the new IP core, there is no introduction and hardware design part.

Observe the calculation results with a four-digit segment display.

8×8 multiplier, the first input value is an 8-bit switch, and the second input value is the output of an 8-bit counter.

Experiment 6 Use of Multipliers and ModelSim 6.1 Experiment Objective