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Altera_Forum's avatar
Altera_Forum
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12 years ago

LAB Optimization

Hi, I've developed an IP Core, were there's a lot of logic operations (xor). All of them are done in a single clock cycle. My IP uses 35.000 LUTs out of 55.000 availalbe in my ARRIA II GX device. ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
12 years ago

Are you sure this is 12.1sp1? It looks like a report from before 12.1. Regardless, the Logic Utilization is at 115%, so it won't fit. If you look at the breakdown, the big killer is 6-LUTs, as your design has 20K and therefore the whole ALM is lost:

-- Unavailable due to unpartnered 6 LUTs 20553

It's basically like adding 20K to your ALUT count.