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| somlo | fpga related article on LWN.net, mentioning yosys/trellis/nextpnr: https://lwn.net/SubscriberLink/801928/25775f5d4b1ec6c4 | 00:42 |
|---|---|---|
| tpb | Title: FPGAs and free software [LWN.net] (at lwn.net) | 00:42 |
| whitequark | >One problem with the LUT-based mechanism is that it is slower than using a "real" gate as the MUXes are driven by a clock, so each level of MUX (e.g. two levels for the two-input XNOR) adds some delay. | 00:44 |
| whitequark | um, what? | 00:44 |
| sorear | addressed in the comments at least | 00:51 |
| gruetzkopf | ehm, someone is confusing FFs with muxes? | 00:51 |
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| chipb | bwidawsk: ^^^ | 03:23 |
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| bwidawsk | ugg | 03:42 |
| bwidawsk | of all the times I present at XDC, lwn picks the one time I don't talk about graphics to make an article | 03:43 |
| bwidawsk | hopefully at least it helped bring some eyes to the projects | 03:45 |
| bwidawsk | even if I didn't have all the facts right | 03:45 |
| chipb | I guess graphics aren't exotic enough to make the cut, huh? | 03:45 |
| chipb | I thought your intro was a reasonable approximation. the audience for the most part are circuit consumers, not designers. | 03:48 |
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| chipb | er, by my presumption, I mean. | 03:49 |
| bwidawsk | yeah, I think also for the fake example I had, it was accurate | 03:49 |
| bwidawsk | or close enough | 03:49 |
| bwidawsk | perhaps I should have spent more effort to explain real FPGAs don't work like the example | 03:54 |
| whitequark | a LUT is pretty much a 1-bit wide asynchronous SRAM, isn't it? | 03:59 |
| bwidawsk | yeah, but the way I chained them up to make an n-LUT out of a 2-LUT | 03:59 |
| bwidawsk | in my example | 03:59 |
| whitequark | mhm | 04:00 |
| whitequark | i'm still not sure where the clock comes from | 04:04 |
| chipb | I took it more as a combinatorial logic delay tick moreso than a literal clock input to a FF. | 04:07 |
| chipb | I guess I'd agree that the wording might've been more precise, but given I believe it was effectively a room full of laymen... *shrug* | 04:18 |
| whitequark | it's just a pity, given the rest of the article is quite good | 04:32 |
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