Forum Discussion
Honored ContributorGlobal, Local, Regional, and Peripheral clocks
Hi All,
How can I know what pins could be used as the Global, Local, Regional, and Peripheral clocks in the ArriaV device (as an example)? What difference between these clocks? Where to read about (manual/tutorial/userguide)? Thank you!17 Replies
Altera_ForumAlternatively, you can manually the clock network selection using Assignment Editor
- Altera_Forum
- Altera_Forum--- Quote Start --- Cannot find the ATLCLKCTRL IP in the IP-Catalog... I'm using the Quartus-II v15.0. Where should I see for this IP? Thank you --- Quote End --- Were you able to find this in IP catalogue? I am using Quartus 16.1.2.203 and targeting for Arria 10 device.
- Altera_Forum
Yes, they're global. However, you can also access the other resources from them. Refer to table 4-1 in the device handbook (https://www.altera.com/en_us/pdfs/literature/hb/arria-v/av_5v2.pdf) for all the options available.
Cheers, Alex - Altera_Forum
Thanks! As for the CLK[0..11] pins, they are the Global clock pins, are not?
But what pins might be used as the Local, Regional, and Peripheral clock pins? Thank you again - Altera_Forum
Look at the appropriate Pin-out file for your device. See pin-out files for altera devices (https://www.altera.com/support/literature/lit-dp.html#arria-v).
Under the Optional Function(s) column, you're looking for the CLK[0..11] pins. Cheers, Alex - Altera_Forum
How can i know what pins in ArriaV might be used as Global or Regional clocks?
In the ArriaV Handbook, in the Table 4-1 (see attached below), there is only mention what the pins are CLK[0..11] and CLK[16..23] for ST devices, but where the pin numbers themselves? Where can I locate the pins (know their pin numbers)? https://www.alteraforum.com/forum/attachment.php?attachmentid=11551 - Altera_Forum
Thanks to all! It was a mistake of a board designer so he connected a clock source to a pin, which was not a dedicated clock pin. As the result, the fitter traveled to far for just picking up a global clock buffer. This travelling was resulted in the setup violations of about 3(!) clock cycles!
It seems I resolved the issue by switching the "Global Signal" pin attribute to OFF. https://www.alteraforum.com/forum/attachment.php?attachmentid=11546 - Altera_Forum--- Quote Start --- Hi All, How can I know what pins could be used as the Global, Local, Regional, and Peripheral clocks in the ArriaV device (as an example)? What difference between these clocks? Where to read about (manual/tutorial/userguide)? Thank you! --- Quote End --- what are you trying to do?
- Altera_Forum
Generally you should only manually assign the clock network type if you have in depth understanding on the clock network and have specific reason ie fanout, timing meeting.
