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Altera_Forum's avatar
Altera_Forum
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17 years ago

signed/unsigned multipliers

I can't seem to find a way to instantiate a multiplier that will dynamically select between signed and unsigned multiplication. This is on a Cyclone II, but applies to other parts as well. Read...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
17 years ago

I think Tricky's workaround is not far off, except that the multiplier should be specified as having signed inputs. Then either sign- or zero-extend each input (by 1 bit, say) based on whether it is a signed or unsigned value, which is trivial. That way, any unsigned value will always become a positive signed value, and a signed value will retain its sign.

I still don't understand why signa and signb aren't available though.