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Altera_Forum's avatar
Altera_Forum
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11 years ago

UniPHY DDR3 simulation is slow

I am using Modelsim to simulate a simple UniPHY DDR3 design and it takes ~10 minutes to finish the DDR3 calibration and assert the local_init_done signal. I did enable the Skip Calibration option in...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
11 years ago

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If you are getting a message like this from ModelSim: 


#  ** Warning: Design size of 31489 statements exceeds ModelSim Altera Starter recommended capacity.
#  Expect performance to be adversely affected.

You should expect the simulation to be slow and the only way around it is to purchase a fully functional version of ModelSim.

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I am not seeing this or similar messages in the Modelsim transcript. My project is very basic. It contains one instance of the DDR3 IP and I am trying to do a simple write followed by a read. What performance should I expect with the Starter edition of Modelsim?

According to this article at http://www.altera.com/literature/hb/external-memory/emi_debug.pdf, full calibration should take 10 minutes and Skip calibration should take 3 minutes. Since my simulation time is right around 10 minutes, I am suspecting that I am doing a full calibration for some reason. Is there a way to check if calibration is really skipped?