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Altera_Forum
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9 years ago

No Ring Oscillator Example seems to works for me (Quartus II 15.0)

Hi, before trying to stop me from it. I know very well why I want ring oscillators and have used them in a competitor's FPGA already, where it was easier to introduce them. Now I wanted to tr...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
9 years ago

OK I tried it with the original system verilog source and instantiate 1200 of them.

Some Ports from the DE4 Board (Buttons and Switches) have these ROs in their Fanout. The Technology Map Viewer shows absolutely nothing connected to these Ports. So everything that was there got removed, including the ROs of course.

So at least I could narrow down the problem, and it doesn't seem to be a logic merging problem.