Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 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
16 years ago

--- Quote Start ---

Just to clarify, have you tried FvM's solution using altmult_add? It's certainly there in Quartus 6.1 and although the symbol in the MegaWizard looks a bit mad at first, if you do as FvM says and set the number of multipliers to 1 it simplifies up a treat.

As a matter of interest, what was the workaround you chose in the end?

--- Quote End ---

Yes, the workaround looks great in Q II 8.1 (I failed to notice the "variable" option for input signedness when I first looked at it).

I'm still trying to get the synthesis bug fixed, but that might take a while. I'll follow up if there's news.

Thanks all,

Tommy