Intel® Quartus® Prime Pro Edition User Guide: PCB Design Tools

ID 683768
Date 8/01/2023

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2.4.7. Running and Interpreting LineSim Simulations

You can run any simulation and make adjustments to the I/O assignments or simulation parameters as required.

For example, if you see too much overshoot in the simulated signal at the destination buffer after running a simulation, you can adjust the drive strength I/O assignment setting to a lower value. Regenerate the .ibs file, and run the simulation again to verify whether the change fixes the problem.

Figure 9. Example of Overshoot in HyperLynx with IBIS Models

If you see a discontinuity or other anomalies at the destination, such as slow rise and fall times, adjust the termination scheme or termination component values. After making these changes, rerun the simulation to check whether your adjustments solved the problem. In this case, it is not necessary to regenerate the .ibs file.

Figure 10. Example of Signal Integrity Anomaly in HyperLynx with IBIS Models

For more information about board-level signal integrity, and to learn about ways to improve it with simple changes to your design, visit the Intel FPGA Signal & Power Integrity Support Center.