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Altera_Forum's avatar
Altera_Forum
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14 years ago

making a processor

I am currently working on a processibng machine that will be programmed onto an altera fpga cyclone 2. I have completed the code and found an interesting issue. it is a 16 bit input and output. i can...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

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i can subtract 1 1 1 1 from 5 5 5 5 and get 4 4 4 4 but i cant subtract 1 1 1 1 from 0 0 0 0 and get F F F F

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Maybe that is because 0000 minus 1111 equals EEEF not FFFF. 0000 - 0001 would be FFFF.