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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).



  • User1574410249703619's avatar
    User1574410249703619
    Icon for New Contributor rankNew Contributor
    5 years ago

    For personal reasons, I'm sorry to reply you so late.

    For AN411,I have read page 32.

    I can understand why Multicycle set , for same edge launch and latch. I don't understand why max data delay now is negative.

    Q1:

    i don't understand max data delay is negative has some related to Multicycle. and why data delay is negative.

    Q2:

    Is it analyzed according to this formula?

    I'm sorry for the trouble！

    Have a good day.