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Altera_Forum
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18 years ago

Large Timing discrepancy between 6.0 and 7.1

Hi, I find a big discrepancy in the maximum frequency when using the default settings for Quartus II 6.0 and 7.1 for one of my cores. Using Quartus II 6.0 I get a maximum frequency of 162....
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
18 years ago

Hi Raul

I doubt this is a bug, or an issue with the timing engine.

I would expect you are seeing different syhthasis / fit results due to changes in the default settings for 7.1.

It may be worth checking the LE useage you are seeing post Synth, and post map in 7.1 when compared to 6.1.

I would expect something that was being optimised in 6.X is geting missed in 7.1 or implemented in LE's.