IBIS models are not needed to verify a design. If available, HyperLynx DRC extracts the rise/fall time, voltage, and pin types (input/output) from the IBIS model. If IBIS models are not available, the default values can be specified on the Setup > Options Default Values > Electrical Net section.
Hello,
While having an IBIS model will increase the accuracy of the results, termination check will work without it as well. IBIS models contains information about the edge rates of the signals of the pins. In HyperLynx DRC we can manually input the electrical length to edge rate ratio in the parameters. While it's agreeably a bit more tedious process, it can be really helpful for the ICs whose IBIS models are not available.
Thanks
Kanchan Vaidya
Hi Kanchan,
Without IBIS models, the Termination Check just flags all long nets as violators, regardless of whether or not they're terminated.
Regards,
Carl
Looks like you have been working with Mentor engineers about this same issue, thank you for pointing it out. Although I can make no commitments, we are looking to enhance this rule. We always appreciate the input from the community users.
Thanks
Kanchan Vaidya
HI Cathy,
The Termination Check basically doesn't work without IBIS models.
Regards,
Carl