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Altera_Forum's avatar
Altera_Forum
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15 years ago

need help to design calculator function (addition and multiplication)

i need to design calculator that performs operations of addition and multiplication of 2 input (5-bit binary) that representing signed decimal numbers (range, -16 to + 15). I've already done the codi...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

It's incorrect module instantiating syntax, I think. You made the BCD decoding more complicated than necessary. Hopefully the design compiler will drop redundant calculations.

Finally, negative numbers aren't handled correctly, I fear. The BCD decoder doesn't work for 2s complement, negative numbers have to be converted to sign/magnitude first. You have to consider how to display the sign, by the way.