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GDeXi's avatar
GDeXi
Icon for Occasional Contributor rankOccasional Contributor
5 years ago
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AN477 Question

Hello, I just feel strange with AN477 doc below: https://www.intel.com/content/dam/www/programmable/us/en/pdfs/literature/an/an477.pdf page 12 why the Calculated output maxi...
  • KennyT_altera's avatar
    KennyT_altera
    5 years ago

    This is because


    1) The multicycle assignments are used to create a setup relationship of 0ns and a hold relationship of -1/2*period.

    2) The value for set_output_delay -max is now negative due to the 0ns setup relationship set by the multicycle then the setup requirement (max data delay).



KennyT_altera's avatar
KennyT_altera
Icon for Super Contributor rankSuper Contributor
5 years ago

This is because


1) The multicycle assignments are used to create a setup relationship of 0ns and a hold relationship of -1/2*period.

2) The value for set_output_delay -max is now negative due to the 0ns setup relationship set by the multicycle then the setup requirement (max data delay).



  • User1574410249703619's avatar
    User1574410249703619
    Icon for New Contributor rankNew Contributor
    5 years ago
    Listening to you is better than reading ten years！！！ Thanks。

  • GDeXi's avatar
    GDeXi
    Icon for Occasional Contributor rankOccasional Contributor
    5 years ago

    Sorry,

    I have thought for a long time, but I still don't understand. Could you describe it in detail? thank you