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RZhen11's avatar
RZhen11
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2 years ago
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SignalTap 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...
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RZhen11's avatar
RZhen11
Icon for Occasional Contributor rankOccasional Contributor
2 years ago

Hi sstrell,

Thanks for your attention.

I've never seen or captured samples mismatch, or no triggering.

My "reliable" means "Invalid JTAG Chain", the device is never more than 60% filled. Meeting timing means no timing error other than unconstrained warnings (those are expected with SignalTap insertions).

Basically, as long as I am able to see SignalTap after programming. I am happy. There is 10% percent chances I don't see it. Tried clean, rebuild. noprune attributes, all sorts. Most of the time, I had to use alternative method or nets to get moving.

Regards,