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Cyclone III fitting forever

Honored Contributor II

Hi all, 


I use Quartus II version 10.1cb for my design in Cyclone III LS with "security separations" features, It worked fine. 

I upgraded to Quartus II version 10.1sp, the fitting ran for 3 days without complete. 

When I converted all security regions to unsecurity regions, it finished in one hour. 


Can anyone tell me what wrong with this. 

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