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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

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I

- => + invert bits then add 1 ?? how come this correct

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Still true. The only problem may be in the most negative number, which does not have the equivalent positive number in two's complement. That is, for 8-bits we can represent from -128 to +127. So, -128 does not have its positive equivalent.