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Altera_Forum's avatar
Altera_Forum
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9 years ago

PLL clock switchover with automatic derivation of PLL clocks is not working

Hi all, I'm using a Cyclone V and need to switch between two input clocks. The clocks have the same parameters. I adhered to the timequest cookbook which says the following: #create a 10...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
8 years ago

Hmm. Have you created your base clock constraints correctly? What happens if you comment out your base clocks and use the -create_base_clocks option with derive_pll_clocks?