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Altera_Forum's avatar
Altera_Forum
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17 years ago

Quartus II Fitter advice

Hi, I am currently upgrading an old deisgn to operate at a higher frequency where the timing is extremely tight. After doing a full compilation, I always recieve some setup timing warnings. Initia...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
17 years ago

Hi,

I just have one further question regarding the DSE.

I was playing around with it again the last day and I noticed that if I specify more than 40 seeds, it gives me warning at the bottom saying something like "may not be useful in a large design" (sorry I don't have the correct warning as on this PC I don't have Quartus installed).

What exactly does it mean by this?

Is it that if you do not meet timing in less than 40 seeds, the design will probably never meet timing. I wasn't planning on running 40 as I can meet the timing with less, but I was just curious as to why the DSE produces this warning before beginning. Would there be anything wrong ignoring this warning and sepcifying a seed sweep of more than 40?

Thanks again for the advise.