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Altera_Forum's avatar
Altera_Forum
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10 years ago

Carry chain on Cyclone V

Hi, I'm new and I have a problem with implementation carry chain in Cyclone V. I have to make a ring oscillator on this line and I have a problem with which component should I use ? I think ab...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
10 years ago

I would do your best to avoid putting a ring oscillator in an FPGA. They're difficult to do and timing gives them a huge variation over PVT, making them not very reliable. That being said, sometimes there is a good reason and I put together the following design. Hopefully it helps.

http://www.alterawiki.com/wiki/ring_oscillator