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GOMEZ_IT's avatar
GOMEZ_IT
Icon for Occasional Contributor rankOccasional Contributor
2 years ago

reg~feeder REMOVE?

Good morning. I'm trying to make 2-register synchronizers for the metstability problem on asynchronous signals. Quartus automatically inserts the LUT between one register and another which calls regx...
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sstrell's avatar
sstrell
Icon for Super Contributor rankSuper Contributor
2 years ago

Have you tried removing the synchronizer identification attributes? The Fitter may be adding the logic to preserve the synchronizer and maximize MTBF. That might be what that logic is between the registers.

  • GOMEZ_IT's avatar
    GOMEZ_IT
    Icon for Occasional Contributor rankOccasional Contributor
    2 years ago
    Yes, I tried, but to no avail.
Does anyone have experience with direct register chains on cycloneive?
    • sstrell's avatar
      sstrell
      Icon for Super Contributor rankSuper Contributor
      2 years ago

      So even without any of the synthesis attributes, this is still happening?