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gschorcht's avatar
gschorcht
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4 years ago

Fitter can't fit a small design in Cyclone V SE that fits in a much smaller Cyclone IV device

Hi, When I try to compile a design for a Cyclone V 5CSEMA5 that works perfectly on a much smaller Cyclone IV, the fitter says: Info (170195): Router estimated average interconnect usage is 2% ...
sstrell's avatar
sstrell
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4 years ago

Since the issue occurs when accessing Data, which is an array (a memory), the issue could have to do with the way memory is implemented in the older device vs. the newer one. Check to see how Data is getting implemented, as logic blocks or memory.

I don't know what else it could be.

gschorcht's avatar
gschorcht
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4 years ago

@strell Thank you for looking at my design.

`Data` is implemented as logic, probably because several elements are read in same clock cycle. I already tried to replace this array by separate register variables, but that didn't help either.