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S_J_S's avatar
S_J_S
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5 months ago
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Agilex 5 Precision DSP block simulations

Hi, I'm using the Precision DSP blocks in my Agilex 5 design; i have a floating point Add (FP_Add_native_DSP) and a floating point MAC (FP_MAC_native_DSP), but when i try and run simulations with th...
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  • S_J_S's avatar
    S_J_S
    4 months ago

    Hi,

    Thank you for looking into this further.

    I agree the Adder is correct and i've also now seen correct behavior, so i'm not sure why it appeared incorrect previously.

    Regarding the MAC; i still see an issue and there has now been an IPS case opened for it (via our AE).

    Since there is an IPS case open i'm happy to mark this particular query as closed.

    Thank you again for your support,

    Simon

CheepinC_altera's avatar
CheepinC_altera
Icon for Regular Contributor rankRegular Contributor
4 months ago

Hi,


Just would like to follow up with you on this. Please let me know if there is any concern. Thank you.


  • S_J_S's avatar
    S_J_S
    Icon for New Contributor rankNew Contributor
    4 months ago

    Hi,

    To replicate the behavior with the Adder, simply create a wrapper around it and try and Add two number together - you'll see the simulation fails and the output simply tracks one of the inputs.

    It's a bit more involved with the MAC, although if you run a simulation with it doing multiple MAC and then de-assert the accumulate signal every 5 cycles you'll notice the outputs do not match what you'd expect. By that i mean they do not match what i get from Python or from running the same testbench on hardware.

    It's tricky getting test cases to you at this time as i don't have the spare time required to put something together and package it all up etc. Do you know of nay issues with the simulation models? Are there any later versions available ?

    Many thanks,

    Simon

    • S_J_S's avatar
      S_J_S
      Icon for New Contributor rankNew Contributor
      4 months ago

      By the way; is it worth me posting this question in other categories? I find the listed categories do not really match what my question relates to so it's hard to know if this is the correct one.