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Altera_Forum's avatar
Altera_Forum
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18 years ago

FIR Coeff Storage in CycloneIII

Hello I'm using a CycloneIII to implement a Fir Filter. I would like to dynamically adjust the coefficients, so I'm trying to use the coefficient reload function. The problem is that the mega...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
18 years ago

Hmm, I get your point.

The thing that makes me believe that it isn't optimizing well is that if I switch the FIR to CycloneII that has M4Ks only, the amount of memory blocks used remains the same.

35M9Ks (CycloneIII) or 35M4Ks (CycloneII) per filter. The same happens if we compare StratixII with M4Ks and StratixIII with M9Ks.

You could check that by trying to instantiate a Fir Filter and switch between the devices to see the resource allocation.

Thanks!

Thiago