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| tcal | I'm looking at the nextpnr-nexus device utilization table, and I'm not sure how to interpret multiplier usage: | 05:52 |
|---|---|---|
| tcal | https://www.irccloud.com/pastebin/HtBAclmc/ | 05:52 |
| tpb | Title: Snippet | IRCCloud (at www.irccloud.com) | 05:52 |
| tcal | Are they different views of the same resources? Is the actual usage the max, or the sum? I'd be confused if it's the sum, since nextpnr-nexus finished placing and routing without error. | 05:54 |
| tcal | (max/sum of percentages...) | 05:55 |
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| zyp | from looking at the numbers, I would guess it's cumulative, starting with the largest | 06:28 |
| zyp | e.g. you're using two of the 18x36 ones, and those also counts as four 18x18 and eight 9x9 | 06:29 |
| tnt | but the total > 100% | 06:59 |
| zyp | no, if it's cumulative, it's 66% total | 07:02 |
| zyp | 16% of 18x36, 16% of 18x18 and 33% of 9x9 | 07:03 |
| tnt | oh ... huh ok. Weird though. I'd expect either them not to add or usage of 9x9 to also count in the larger ones (since it effectively blocks them too). | 07:04 |
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| gatecat | an 18x18, for example is 4 MULT9 primitives and one MULT18 primitive | 07:37 |
| gatecat | the Nexus arch builds larger ones by cascading smaller ones with a block to combine them | 07:37 |
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| mithro | @acomodi -- Are you looking at the kokoro failure on symbiflow-arch-defs at all? | 19:02 |
| mithro | @acomodi - https://github.com/SymbiFlow/symbiflow-arch-defs/pull/2290 | 19:43 |
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