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AlenaK's avatar
AlenaK
Icon for New Contributor rankNew Contributor
6 years ago

Unexpected transport delays in functional simulation

Hello,

we're trying to verify a circuit using Functional Simulation. We know that output signal goes to state '0' at the clock's rising edge. But we see the output switching delay.

So, the question is why Quartus takes into account transport delay in this simulation mode? Perhaps, we can turn off transport delays for functional simulation? Could anyone help us? Thank you!

3 Replies

  • KennyT_altera's avatar
    KennyT_altera
    Icon for Super Contributor rankSuper Contributor
    6 years ago

    Hi Alena,

    What device that you were using? timing simulation should be avoided as it take long time. We would suggest to use timing analyzer instead.

  • sstrell's avatar
    sstrell
    Icon for Super Contributor rankSuper Contributor
    6 years ago

    It's unlikely that you're seeing a transport delay when performing a functional simulation. Are you saying the output is going low between the current and next clock edges?

    As mentioned, try using the timing analyzer on the output path to see if the design is failing timing.

    #iwork4intel