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Altera_Forum's avatar
Altera_Forum
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9 years ago

ALTCLKCTRL vs PLL with 2 reference clocks

Hello, My Cyclone V design has 2 reference clock inputs. I want to be able to manually switch between them during runtime. I know that the ALTERA_PLL megafunction can be configured to r...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
9 years ago

Which one? It's up to you. Based on what you've described of your requirements, either will do.

ALTCLKCTRL is arguably better as it can be configure to guarantee glitch free switchover. ALTPLL doesn't. Depending on your design this may be desirable.

Cheers,

Alex