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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
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9 years ago

Thanks.

Another question about the ALTERA PLL when configured to use 2 reference clocks.

Is this achieved buy cascading an upstream ALTCLKCTRL "behind the scene" and connecting its output to the PLL?

Or is the dual clock input is a native feature of the PLL itself ?