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Altera_Forum's avatar
Altera_Forum
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17 years ago

Is the sum signed in LPM_MULT megafunction?

This is a pretty straightforward question - I did not find the answer in the docs:

- Is the sum input vector of an LPM_MULT megafunction signed? Is it only signed if the multiplication is signed?

Thanks.

1 Reply

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    17 years ago

    To my opinion, it makes no difference, if you understand the sum input as signed or unsigned. Generally there's no difference between signed and unsigned add, unless saturation or carry is involved.

    Apparently, the sum option has been removed starting with the V8 MegaWizard.