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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

you have to sign extend the inputs to the length of the output.

so for 2 4 bits inputs you get an 8 bit result. The sign extension has to go on for the full 8 bits (ie. treat the inputs as 8 bits)