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Altera_Forum's avatar
Altera_Forum
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17 years ago

Help!! Error message

Hi, when i compile my simple design i get the error as such: Error reported by S-function 'sGeneric' in 'wateva2/Parallel Adder Subtractor': Loop detected while propagating bit widths for wa...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
17 years ago

HI Clare

Sorry I can't fully make out your schematic but it looks as though you have a combinatorial loop - i.e. signals will just keep whizzing around the loop and make it oscillate. If you have feedback in a lump of logic then it must be registered somewhere to prevent this instability occurring.

On the other hand if you do have a register in there and I'm being blind then I do apologise.

Are you using a schematic or HDL?

Cheers

batfink