Re: Frequency Selection (Clock Multiplexing)

Altera_Forum · ‎03-02-2017

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 · ‎03-03-2017

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 · ‎03-03-2017

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

Altera_Forum · ‎03-03-2017

You can reconfigure the PLL while the FPGA is running.

Altera_Forum · ‎03-03-2017

Yes, check out PLL reconfiguration.

https://www.altera.com/en_us/pdfs/literature/an/an661.pdf