Forum Discussion
Pack_of_lone_wolves
Occasional Contributor
Occasional ContributorPlacement constraints for PLL in QPP
There is the feature called as logic lock which can fix placement of a node, I want to know if it is possible to use logic lock for fixing position of PLL? I get a warning in plan stage of fitter as "...
You can choose "Location" for that version of Quartus Prime.
AqidAyman_Altera
Regular Contributor
Regular ContributorFrom my opinion, logic lock will reduce the flexibility for you on the timing side of the design. My suggestion is you need to change the PLL location through the qsf assignments.
Pack_of_lone_wolvesOccasional Contributor
Occasional ContributorI could see following cmd in qsf file:
set_instance_assignment -name RESERVE_REGION "coordinates" -to PLL_instance.
set_instance_assignment -name RESERVE_PLACE_REGION OFF -to PLL_instance
For the second cmd, I changed it to ON and reran the Fit - Plan, but still same message is displayed.
set_instance_assignment -name RESERVE_REGION "coordinates" -to PLL_instance.
set_instance_assignment -name RESERVE_PLACE_REGION OFF -to PLL_instance
For the second cmd, I changed it to ON and reran the Fit - Plan, but still same message is displayed.
