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PhilipJ451's avatar
PhilipJ451
Icon for New Contributor rankNew Contributor
4 years ago

Force Quartus to keep a signal for SignalTap to use

Hi, I am hoping someone may have an answer to a problem I have wrestled with for a long time. I make a lot of use of SignalTap to analyze what is going on inside my FPGA design but so often I fin...
sstrell's avatar
sstrell
Icon for Super Contributor rankSuper Contributor
4 years ago

I'm presuming you are using Quartus Standard because that's a Cyclone V device. Pro now has the new "preserve for debug" feature just for this issue.

Are you trying to tap pre-synthesis or post-fit nodes? I'm presuming post-fit because if you tap pre-synthesis nodes, they should be preserved through compilation. If you can, try using the Signal Tap pre-synthesis filter in the Node Finder when you tap nodes and see if that makes a difference.