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_ForumRead the Clock Networks section of the arria v device handbook (https://www.altera.com/en_us/pdfs/literature/hb/arria-v/av_5v2.pdf). Table 4-1 shows you exactly which pins you should use to access the clock resources available. Avoid specifically instantiating the ALTCLKCTRL IP and let Quartus chose the appropriate resources needed for your design.
Cheers, Alex- Altera_Forum
Probably the Fitter make such a route to meet timing requirement .
- Altera_Forum
Is every device pin/pad has an attached Global Clock Buffer? I had a design where the Fitter went to another rib of the device to pick up a Global Clock buffer there... Why did it do so? How to avoid such route "travelling"?
- Altera_Forum
What's the difference between the Local, Regional, and Peripheral clocks? Are there another clock types (besides Global)?
- Altera_Forum
Should I manually insert this IP into my HDL code?
- Altera_Forum
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
- Altera_Forum
Hi dmitryl,
As far as I know you can use any pin as global, local, regional or peripheral clock when you use Altera's ATLCLKCTRL IP block. The IP block allows you to "promote" a certain signal to travel over dedicated spines, e.g. the global spine which covers the entire FPGA, or a local clock spine, which covers only certain area of the FGPA etc. Regards, Richard.
