Frequency Selection (Clock Multiplexing)

Question

Hello,

I would to like to know a way for selecting one frequency at a time from the output frequencies from an ALTPLL that generates 8 or more different frequencies.

I’m trying to use ALTCLKCTRL but it has a limited number of inputs. I'm using Stratix V FPGA.

So, do you have any suggestions?

Thanks

altera_forum · Answer

I don't know a way to do this, but could you reconfigure the PLL for eight different frequencies and connect to a single output?

altera_forum · Answer

I need some kind of multiplexing to select a new frequency while the FPGA is still running.

altera_forum · Answer

You can reconfigure the PLL while the FPGA is running.

altera_forum · Answer

Yes, check out PLL reconfiguration.  https://www.altera.com/en_us/pdfs/literature/an/an661.pdf

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Frequency Selection (Clock Multiplexing)

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