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Honored Contributor
Honored ContributorCyclone III - PLL VCO range ?
Hello, What is the frequency range of CycloneIII PLL VCO ? PDF writes 600-1300MHz, but altpll withard creates PLLs with frequencies less than 350MHz. For PLL reconfiguration feature it's ...
Altera_ForumHonored Contributor
Honored ContributorYou can try with new Quartus II v7.2 that just has been released by Altera. I have tried using ALTPLL megawizard, which allows for generating frequency that can go upto 1300 MHz for input clock frequency of 48 MHz. I don't know how that worked with prior releases since I don't have it installed on my machine. The output frequency will be limited if you are using multiple clock outputs with various settings. If you are using only one input and one output, you should be able to achieve the maximum as is advertised. But if you are using various combinations, then the output options will be limited.
-BD
