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Altera_Forum's avatar
Altera_Forum
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16 years ago

Larger multipliers are faster?!

I'm designing some IIR filters in a Cyclone III, so I had a quick look to see how fast I could get a large multiplier to run. I used lpm_mult, with a latency of 2, and optimized for speed (latency 2 ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

I tried two approaches, and they both give similar results. I used the "Standard Fit" option in fitter settings, and I used "Auto Fit" while manually increasing the required fmax.

I get the 48x48 to 192 MHz, and the 64x64 to 220 MHz.