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Altera_Forum's avatar
Altera_Forum
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17 years ago

Long place and route after adding logic lock regions

In the past, when quartus could not fit designs, it usually bailed on me after about 8 hours of place and route. I added logic lock regions so I could isolate partitions for timing and close ti...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
17 years ago

It finally quit after about 55 hours. It apparently maxes out at 100 iterations of region placement, and it took that long to get there.

I've given up on the LLR's at this point in time, so fit time is back down to a few hours. It's currently fitting, so I don't have a report to post. Working on improving constraints/going to look at layout ECOs at this point. Some clocks/reset signals had changed in the hierarchy recently, and the assignments didn't get updated so global signals weren't marked properly, nor were some of the other assignments valid.

Using Quartus II 8.1.