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raviganesh's avatar
raviganesh
Icon for Occasional Contributor rankOccasional Contributor
5 years ago

ALTPLL Clock switchover in Cyclone 10 LP

I am using the ALTPLL to generate a 80MHz clock from a 48MHz clock. This is fine. Later when an independent clean 80MHz clock is available I am switching over to this clock by using the clock switch...
JonWay_altera's avatar
JonWay_altera
Icon for Frequent Contributor rankFrequent Contributor
5 years ago

Hi @User15891149574421405910​ You will need to perform a dynamic reconfiguration if you want to keep the same 80Mhz when you are switching ref clock from 48Mhz --> 80Mhz.

Normally, the usage model is that....

For redundancy purposes, you have 2 ref clock of the same frequency + automatic switchover.

For clock sources originate from multiple cards on the backplane, requiring a system-controlled switchover between frequencies of operation (e.g. manual switchover + dynamic reconfiguration).

Hope this answers your questions.