Forum Discussion
RZhen11
Occasional Contributor
Occasional ContributorSignalTap Invalid jtag (completely wiring dependent)
Dear support, This issue has haunted me since 16.1 till 22.1std. SinglTap is not reliable. And it is completely wiring dependent. I don't see hardware or setup issue, since reducing wiring will get...
Ouch.
Have you tried slowing the JTAG clock or making sure you have the JTAG timing constraints in your .sdc:
https://www.intel.com/content/www/us/en/docs/programmable/683081/22-2/jtag-signals.html
https://www.intel.com/content/www/us/en/support/programmable/articles/000084236.html
sstrell
Super Contributor
Super ContributorWhen you say Signal Tap is not reliable, what exactly do you mean? Are you saying the captured samples don't match what you expect or is it not triggering on the trigger conditions you've specified? How full is your device? When you say that the design is meeting timing, is it meeting timing with Signal Tap both enabled and disabled?
