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Altera_Forum
Honored Contributor
Honored ContributorFmax Improvment
I'm trying to improve Fmax in our design. See the archived quartus II proejct file in the attachment. The source files are also attached. In my currrent design, after compilation, Fmax can reach ...
Altera_ForumHonored Contributor
Honored Contributor --- Quote Start --- Thank you. flz47655. One more question: What's the difference of Fmax and Restricted Fmax? I used timequest to report the Fmax. And find there is a big differnece between Fmax and Restricted Fmax. See attached picture. https://www.alteraforum.com/forum/attachment.php?attachmentid=10599 --- Quote End --- FMax is a theoretical max frequency if there are no restrictions Restricted FMax is when there are restrictions ( timing specs provided by engineer, limitations of the part you are using etc). --- Quote Start --- That's a good idea. Do you think "/" operation will lead to lower Fmax than "shift_right"? --- Quote End --- There is no different between shift_right and /2^n. They are the same operation. But using the / operator can make the code more readible. Be aware that dividing by some other value (that is not 2^n) will instantiate a divider, and that will have a terrrible fmax).
