- Libresilicon-developers - libresilicon.com

Successful Tapeout!!!
by Philipp Gühring 05 Sep '21

05 Sep '21

Hi everyone, Hooray, we made a tapeout with Libresilicon technology! The story starts a long time ago (around 2019) with the idea of growing standard cells from a single Inverter to a whole standard cell library like popcorn, but in a reproducible way. We developed a toolchain which starts from the Design-Rules (DRC) and netlists, and automatically layout, DRC-fix, simulate, characterize and document standard cells for each of the given netlists. That toolchain is currently able to layout about 80% of the cells DRC clean: https://github.com/thesourcerer8/StdCellLib/ You can see a resulting standard cell library here: https://pdk.libresilicon.com/dist/StdCellLib_20210618/Catalog/buildreport.h… Now that the toolchain has matured enough to be usable, I decided to try it on the Skywater 130nm process node through a Google Shuttle: https://github.com/thesourcerer8/caravel_stdcelllib_stdcells_project It automatically takes all the DRC-cleanly generated standard cells from StdCellLib, and puts each of the cells seperately on a test-wafer, and connects each cell up to the IO and to the internal logic analyzer (since there aren't enough IOs), then it uses OpenLane/OpenROAD to automatically layout the whole core. The whole toolchain from DRC+Netlists to test-wafer GDS runs in about 2-3 hours at the moment. I successfully submitted the design to EFabless/Google/Skywater, and expect packaged silicon back by the end of the year. One interesting tool I developed is a generic automatic DRC fixing engine, which is used to post-process the layouted cells for more complex rules which wouldnt make sense to implement in the layout generator engine. Open Tasks where help is needed: * I started working on automated Verification firmware that tests all possible input combinations of all the cells, but this isn't completed yet. * We should try to improve lclayout to be capable to characterize sequential cells * I implemented various workarounds (fixup's) that fix up the layout of the standard cells to be compatible with the existing Skywater standard cells. We should think about which of those should be put into lclayout, to cleanup the toolchain there. * As a next step we should take some medium complexity digital logic and completely synthesize/place/router it as a core with our own cells. Does anyone want to lead that project? Best regards, Philipp Gühring

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Skywater 130
by Philipp Gühring 05 Sep '21

05 Sep '21

Hi, For creating your own digital Sky130 project, you need to clone the caravel_user_project: https://github.com/efabless/caravel_user_project/ For creating your own analog/mixed Sky130 project (which gives you some analog IO Pads), you need to clone the caravan project: https://github.com/efabless/caravel_user_project_analog I collected some documentation videos about Sky130 and various topics arount it: https://docs.google.com/spreadsheets/d/1fM301JZe_2h0-mTfyahFGRWqt3fDhnnSe2X… The next tapeouts are most likely around October and December. Best regards, Philipp

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Announcement - Mumble session on Sunday 2021-09-05 @ 18:00 UTC
by Hagen SANKOWSKI 04 Sep '21

04 Sep '21

Hello List! This is our weekly announcement for the next Mumble Sessions on Sunday 2021-09-05 @ 18:00 UTC. Please join us as usual at our Mumble Server murmur.libresilicon.com at Port 64738, the Channel is IC. We like to follow-up our topics from mumble sessions before. Regards, Hagen.

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Announcement - Mumble session on Sunday 2021-08-29 @ 18:00 UTC
by Hagen SANKOWSKI 01 Sep '21

01 Sep '21

Hello List! This is our weekly announcement for the next Mumble Sessions on Sunday 2021-08-29 @ 18:00 UTC. Please join us as usual at our Mumble Server murmur.libresilicon.com at Port 64738, the Channel is IC. We like to follow-up our topics from mumble sessions before. Regards, Hagen.

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The Meta-Mailinglist
by David Lanzendörfer 26 Aug '21

26 Aug '21

Hello In order to keep the conversations on the developers mailinglist purely technical, I encourage you all to sign up to libresilicon-meta: https://list.libresilicon.com/mailman/listinfo/libresilicon-meta Please remember that as always the Non Aggression Principle is the law of the land, so if you absolutely MUST call someone an *ist and *phobe, please do so with measure and provide founded debatable arguments for your claim. Cheers -lev -- (\__/) (='.'=) This is Ninja Bunny. (")_(") Copy and paste Bunny into your signature to help him gain world domination

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Code of conduct
by David Lanzendörfer 26 Aug '21

26 Aug '21

Hi I've been thinking about how to handle situations in the future like the mailing list recently, and I came to the conclusion that a code of conduct has to be formulated, which states that this project aims to be neutral when it comes to anything beyond manufacturing free and open source silicon, so political debates aren't welcome. If it's ok, I will draft a text on the Mediawiki. Cheers -lev -- (\__/) (='.'=) This is Ninja Bunny. (")_(") Copy and paste Bunny into your signature to help him gain world domination

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New "CoC": The non agression principle (NAP)
by David Lanzendörfer 25 Aug '21

25 Aug '21

Hi The new "Code of Conduct", in the sense of a Beijing style hammer drop and "crack down" but with Leviathan' characteristics xD THIS is the NAP: https://en.wikipedia.org/wiki/Non-aggression_principle Cheers -lev PS: Taxation is theft :-) -- (\__/) (='.'=) This is Ninja Bunny. (")_(") Copy and paste Bunny into your signature to help him gain world domination

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Meeting
by David Lanzendörfer 22 Aug '21

22 Aug '21

Hi I kind of one in a life time was able to sleep without getting woken up by nightmares or my hurting leg and slept 12 hours straight, just woke up. Sorry for missing the meeting. Also: Hagen is in holiday anyway. Cheers -- (\__/) (='.'=) This is Ninja Bunny. (")_(") Copy and paste Bunny into your signature to help him gain world domination

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Wikimedia
by David Lanzendörfer 20 Aug '21

20 Aug '21

Hi I'm done setting up the Wiki: https://wiki.libresilicon.com Cheers -- (\__/) (='.'=) This is Ninja Bunny. (")_(") Copy and paste Bunny into your signature to help him gain world domination

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Re: [Libre-silicon-devel] sam zeloof home-made IC
by lkcl 16 Aug '21

16 Aug '21

On August 15, 2021 7:52:52 PM UTC, "David Lanzendörfer" <leviathan(a)libresilicon.com> wrote: > >In some ironic twist of faith the current situation might be actually >really >good for Islamists because right now everyone is paranoid about COVID >and >forgets about extremist Islamic terror LOL dis-eases don't care what your beliefs are: maybe the extremists will realise we're all human after all, eh? l.

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