Arria 10 PLL Reference clock sources

[Mathis1]

Hello, quick question:

Can the HPS user clock be used as the reference clock to an IOPLL IP on the Arria 10?

If yes, are there some cases where the IOPLL output clocks would be unsuitable because the reference clock is from a generated clock and not from a potentially more precise external source.

I had a Cyclone V design where using the HPS user clocks as reference clocks worked fine, but now that I am switching architecture I cant find any resources telling me that this will/wont work for the Arria 10

Thanks

[JingyangTeh_Altera]

Hi

Yes, you can use the User Clock from the Arria10 HPS to be connected to the IOPLL IP.

Are you facing any problem with this connection?

Regards

Jingyang, Teh

[Mathis1]

No, just worried about generating a clock from an already generated clock with respect to clock uncertainty. But if you say it works then I'll assume it works

[JingyangTeh_Altera]

Hi

I’m glad that your question has been addressed, I now transition this thread to community support. If you have a new question, Please login to ‘https://supporttickets.intel.com/s/?language=en_US’, view details of the desire request, and post a feed/response within the next 15 days to allow me to continue to support you. After 15 days, this thread will be transitioned to community support. The community users will be able to help you on your follow-up questions.

Regards

Jingyang, Teh