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Altera_Forum
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15 years ago

how many simultaneous adds?

Right guys - just looking for some experience. Im looking at a new algorithm thats going to serious eat up my logic with adders (needs a 11x11 matrix of differences summed into single value, an...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

Take a look at the synthesis cookbook:

http://www.altera.com/literature/manual/stx_cookbook.pdf?gsa_pos=1&wt.oss_r=1&wt.oss=synthesis cookbook

Arria II should be able to do ternary addition without problem. If you do more than that, I don't believe it will break the carry chain, it will just create multiple adders with carry chains feeding each other. Definitely something you're going to have to experiment with to see the breaking point, both from an area and performance perspective.