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| miek | what's the state of ecp5 dsp suport at the moment? if i wanted to make an fir filter for example, is it a case of using diamond/clarity to find the right primitives to stick together, or is it more complicated than that? | 15:11 |
|---|---|---|
| daveshah | Only the MULT18X18D is supported by nextpnr/trellis, and cascading isn't supported either | 15:11 |
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| awygle | dang daveshah, you're the best. was not expecting to wake up to a fix, especially given i did nothing to help you lol | 15:36 |
| daveshah | tbh I just tried it with an adder JSON I had lying around | 15:36 |
| awygle | well thanks :) now it is obvious that... i am not meeting my timing req lo | 15:38 |
| awygle | l | 15:38 |
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| awygle | can i get `yosys show` to drop the clock signal? it really clutters up the output | 20:37 |
| mwk | hmm | 20:38 |
| mwk | 'show w:<your clock wire name here> %n'? | 20:39 |
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| awygle | how would that interact with other arguments? | 20:44 |
| mwk | what other arguments? | 20:44 |
| awygle | to the show command | 20:44 |
| mwk | any -options should come before the selection part | 20:44 |
| awygle | and what about the "which module to draw" argument? | 20:45 |
| mwk | oh, then you need to combine selections | 20:45 |
| awygle | (i tried dropping it and using select beforehand but it still complains about needing only one module to output svg) | 20:45 |
| mwk | `show top w:<clockwire> %n %i` | 20:45 |
| mwk | does this work? | 20:46 |
| awygle | that got it, yes | 20:46 |
| awygle | great, thanks | 20:47 |
| awygle | what syntax is that? | 20:47 |
| mwk | `help select` | 20:47 |
| awygle | ... and how would i also add the reset line to it? :p | 20:47 |
| awygle | ah ok | 20:47 |
| mwk | `show top w:<clockwire> %n %i w:<resetwire> %n %i` | 20:47 |
| awygle | dang that's complicated | 20:47 |
| mwk | not exactly pretty, but should work | 20:47 |
| mwk | yeah | 20:47 |
| mwk | hmm or actually | 20:48 |
| mwk | `show top w:<clockwire> %d w:<resetwire> %d` | 20:49 |
| mwk | %d should be equivalent to %n %i I guess | 20:49 |
| awygle | that's awesome, thanks a ton mwk | 20:51 |
| awygle | wasn't there some work on using opentimer with nextpnr? | 21:17 |
| daveshah | not that I know of | 21:17 |
| awygle | ah | 21:18 |
| awygle | i'm kind of struggling with figuring out what's actually my critical path here | 21:18 |
| awygle | oh well, i'll work it out | 21:18 |
| daveshah | yeah, timing is a real weak point of nextpnr | 21:19 |
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