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OLevy1's avatar
OLevy1
Icon for Occasional Contributor rankOccasional Contributor
6 years ago

adding 2 high speed reed solomon decoders increased the 'Logic Utilization' in 20% (only 7% was expected based on other project where i also added the same 2 high speed reed solomon decoders).

based on the reports i have attached (5100 is before i added the decoders and 5101 is after), can someone tell me why the 'Logic Utilization' increased so much? thanks, Oren
CheepinC_altera's avatar
CheepinC_altera
Icon for Regular Contributor rankRegular Contributor
6 years ago

Hi,

As I go through the QSF files and perform a diff, for your information, I do not spot significant different which might lead to the resource utilization difference. The only different which might be related is the following:

5100.QAR

set_global_assignment -name FITTER_AGGRESSIVE_ROUTABILITY_OPTIMIZATION NEVER

5101.QAR

set_global_assignment -name OPTIMIZATION_MODE "AGGRESSIVE PERFORMANCE"

I am not sure how these would impact the utilization but for better comparison, generally it is recommended to use the same settings as much as possible.

Please let me know if there is any concern. Thank you.

Best regards,

Chee Pin