Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 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
15 years ago

Very strange indeed. I would advise to file a service request to altera. They should be able to tell you which one of the numbers is wrong, or if there is a special "superfast" carry chain that only gets used by 64bit operations