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Altera_Forum
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18 years ago

Cyclone 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_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
18 years ago

If it shows after post-scale counter, so upper frequency "after post-scale" should be 1300/2=650. But withard makes VCO upto 1300MHz. So I believe, a withard shows real VCO frequency. Not after post-scale.

I also asked for Altera at MySupport. Will see what is the truth.