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Seems like one of the pain points with Xlinix DSPs that if you want either a 32-bit ADD or a MAD you need to CLB the A B inputs differently due to how the ADD path takes A:B and the MUL takes A,B.

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At least with ultrascale+ if you can afford to run at just 27-bits instead of 32, it’s easier to just always MAD instead of optionally ADD

At least with ultrascale+ if you can afford to run at just 27-bits instead of 32, it’s easier to just always MAD instead of optionally ADD

Properties5
typearchive
sourcetwitter
date2026-08-06
tagsarchive, twitter, notimothylottes
descriptionAt least with ultrascale+ if you can afford to run at just 27-bits instead of 32, it’s easier to just always MAD instead of optionally ADD

Aug 06, 20261 min read

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  • URL: https://x.com/NOTimothyLottes/status/2085367363373850680
  • Author: NOTimothyLottes (@NOTimothyLottes)
  • Posted: 2026-08-06 14:08:18

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At least with ultrascale+ if you can afford to run at just 27-bits instead of 32, it’s easier to just always MAD instead of optionally ADD

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  • Seems like one of the pain points with Xlinix DSPs that if you want either a 32-bit ADD or a MAD you need to CLB the A B inputs differently due to how the ADD path takes A:B and the MUL takes A,B.

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