Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
8 years ago

Placement cannot find a legal solution

Hi, I am targeting the a10gx using AOC and Quartus Prime, both v16.1.2 Build 203. According to the logs my design is not overutilizing resources, but the building process fails during fitt...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
8 years ago

Your log indeed looks strange. The fitter just throws some "Placement cannot find a legal solution" messages and aborts. The numbers in the top.fit.summary file do not make much sense either, especially the ALM utilization. However, as I also mentioned in the other thread, these numbers seem to overflow in cases where utilization goes over 100%. What do you get from aoc's resource estimation? If the logic utilization you get is over 80%, my guess is that you are running out of logic, even though that would be very rare/strange on Arria 10.