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| whitequark | daveshah: could you explain how EBR works in ECP5? | 07:46 |
|---|---|---|
| daveshah | whitequark: in what context? | 07:47 |
| whitequark | i feel like there's some significance to PDP RAM being 2x larger than TDP RAM | 07:47 |
| daveshah | It's not 2x larger | 07:48 |
| daveshah | It's 2x wider | 07:48 |
| daveshah | because it uses the signals of the read and write sides of both ports | 07:48 |
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| whitequark | hm | 07:51 |
| whitequark | oh I see | 07:52 |
| whitequark | I still can't use TDP primitive to make SDP one in my own HDL, right? | 07:53 |
| whitequark | as in, it reuses existing connectivity of the tile in a slightly different way to provide wider ports, right? | 07:54 |
| daveshah | Yes, thats right | 07:55 |
| whitequark | gotcha, thanks!! | 07:55 |
| daveshah | You could make a 36 bit wide RAM using both ports of the TDP RAM but it would be a single port RAM | 07:55 |
| whitequark | oh and what's the reason yosys only has a single aspect ratio defined for PDPW16KD? | 07:56 |
| whitequark | memory_bram limitation? or something more fundamental? | 07:56 |
| daveshah | Yeah Yosys only supporting symmetric RAMs | 07:56 |
| daveshah | And PDPW only supports a 36 bit write width iirc | 07:56 |
| whitequark | TN1264 says it has variable write width | 07:57 |
| whitequark | is that a lie? | 07:57 |
| daveshah | I think that's what I found | 07:57 |
| daveshah | It doesn't make any sense below a 36 bit write width though | 07:57 |
| daveshah | You might as well just use DP16KD | 07:58 |
| daveshah | *36 bit read and write width | 07:58 |
| daveshah | given Yosys requires symmetry | 07:58 |
| whitequark | makes sense | 07:58 |
| whitequark | vendor model seems to hardcode 36 bit write width | 07:59 |
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| phyrexian | I'm trying to build examples in prjtrellis for ecp5, however every time I get "ERROR: Found netlist using legacy-style JSON parameter values, please update your Yosys.". However, I have latest yosys 0.9 (built from recent master from Dec 22) | 18:17 |
| phyrexian | couldn't find an explanation for this error and not sure who is at fault here - yosys, nextpnr or some switch is now required in yosys for "non-legacy" values? | 18:18 |
| phyrexian | (the error is given by nextpnr-ecp5) | 18:20 |
| daveshah | Do you have the Yosys 0.9 release or Yosys from git master | 18:20 |
| daveshah | The latter is needed for nextpnr | 18:21 |
| phyrexian | git master, tag dadaf7ed788370c94a463e5e479bed4d540cdf4b (from Dec 22, few days ago) | 18:22 |
| phyrexian | same for yosys and prjtrellis, all from recent git master just a few days ago | 18:22 |
| daveshah | Which example are you building? | 18:22 |
| daveshah | It is possible it is a bug somewhere | 18:23 |
| phyrexian | prjtrellis/examples/ecp5_evn | 18:23 |
| phyrexian | (don't know how to check that what nextpnr claims about the netlist is true) | 18:24 |
| daveshah | phyrexian: can you grep for `"CEMUX":` in the json? | 18:31 |
| daveshah | if you see "CEMUX": "1" without a space after the 1 then it is a legacy style JSON parameter (which Yosys from around August or beyond shouldn't be creating) | 18:31 |
| phyrexian | it seems then it looks like it has the legacy parameters, here is paste from generated json: https://pastebin.com/F7cXQKQn | 18:35 |
| tpb | Title: [JSON] blinky.json.old - Pastebin.com (at pastebin.com) | 18:35 |
| daveshah | phyrexian: looks like you aren't using git master Yosys | 18:36 |
| daveshah | are you sure you didn't forget a `make install`? | 18:36 |
| phyrexian | I can try to rebuild | 18:37 |
| daveshah | Rebuilding is unlikely to help if it built OK last time | 18:37 |
| daveshah | My guess is that either it's not git master or you aren't actually using the new yosys you built | 18:38 |
| phyrexian | I pulled the latest master, built/installed it and it seems to have fixed it. thanks | 19:00 |
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