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Guild: wafer.space Community
Channel: Information / off-topic
After: 04/30/2026 23:59
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[05/01/2026 03:10] mithro_
https://antmicro.com/blog/2026/04/simulating-active-cooling-using-a-cfd-based-flow is pretty cool 🙂

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https://antmicro.com/blog/2026/04/simulating-active-cooling-using-a-cfd-based-flow
Simulating active cooling using a Computational Fluid Dynamics-base...
2026-05_media/cfd--blog-sm-47236.png


[05/01/2026 20:46] namibj
I love it when system just breaks and you have to try and fix things when just wanting to take a lunch break...


[05/01/2026 21:38] namibj
running again, at least


[05/01/2026 21:39] nmz787
I'd recommend https://www.crowdsupply.com/1bitsquared/icebreaker-fpga since they have great tutorials https://docs.icebreaker-fpga.org/getting-started/, also lots of resources https://www.fpga4fun.com/

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https://www.crowdsupply.com/1bitsquared/icebreaker-fpga
iCEBreaker FPGA
An open source iCE40 FPGA development board designed for teachers and students
2026-05_media/icebreaker-iso_png_project-main-EB517.jpg


[05/01/2026 21:44] nmz787
apparently this "tang" fpga also is supported with open tools, and looks pretty cheap https://github.com/twied/TangPrimer-20K-example

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https://github.com/twied/TangPrimer-20K-example
GitHub - twied/TangPrimer-20K-example: Examples for the Sipeed Tang...
Examples for the Sipeed Tang Primer 20K FPGA using Open Source tools under Linux - twied/TangPrimer-20K-example
2026-05_media/TangPrimer-20K-example-ED6A9


[05/01/2026 22:47] vegard_e
strictly speaking, «tang» is not the name of a fpga, it's the name of sipeed's family of fpga devboards, they're based on gowin fpgas


[05/01/2026 22:50] namibj
any specialties from your compsci degree you may consider relevant to being able to do something more interesting than the average FPGA/ASIC "beginner after having finished a master's in compsci" perhaps?

There is of course the potential to work towards a demoscene entry for the spring 2027 competition I'd predict there to be on/with TT?
Unfortunately copyright of early video games (of the arcade era) might be in the way of doing a "remake" of such a game, perhaps using modern extensions/gamemodes to go along with the old.


[05/01/2026 22:51] namibj
was wondering why it didn't sound like any familiar fpga family; but gowin explains that well.
Yeah, they do have quite good price/performance and I've heard them to not demand $$$$ vendor tooling to utilize.


[05/02/2026 02:56] mithro_
I would also say that teaching software engineers hardware design has been significantly easier than teaching hardware engineers software design.


[05/02/2026 02:58] mithro_
There is also the Fomu workshop -> https://workshop.fomu.im -- And if you are at an event I'm also at, then I'll happily give you one of the Fomu boards for free if you show me that you have installed the toolchain.


[05/02/2026 06:25] .leonmc
Not sure, I haven't been able to come up with something, but currently I'm more worried about learning the basics than figuring out to do once I have.
Demoscene sounds cool, though spring 2027 is quite some time away (and speculative, if I understand your message correctly?).


[05/02/2026 06:31] mithro_
@Leon - I think there is currently a demoscene competition open right now? https://tinytapeout.com/competitions/demoscene-ttsky26a-announce/

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https://tinytapeout.com/competitions/demoscene-ttsky26a-announce/
TTSKY26a Demoscene Competition - Tiny Tapeout
Build a sound and graphics demo on 130nm ASIC


[05/02/2026 06:32] mithro_
The infrastructure that Tiny Tapeout has which lets you see the simulated VGA output in the browser is super cool.


[05/02/2026 06:38] .leonmc
As far as I understand, the deadline for submissions is about a week from now, this is too soon for me 😅


[05/02/2026 12:10] namibj
hence me suggesting to aim _calmly_ for the one we'd expect a year after.


[05/02/2026 16:18] mithro_
The best time to plant a tree was 30 years ago, the next best time is today 🙂

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[05/02/2026 17:55] namibj
https://discord.com/channels/1361349522684510449/1361349523724570941/1500181556608635151
Honestly doesn't even need to be that huge, but I don't think the thin 0.8 mil wire is appropriate for a 5V output gate consuming on the order of 2~5 W (in what I assume to be mostly the gate "poly" of the GaN die).
Yes that's supposed to be a class-B power amplifier output stage on the wafer.space die into an impedance matching network (on consideration of the capacitive load and trying to be less wasteful, and not melting the wafer.space die).

It'd serve as PoC of the drive so that together with extensive simulation of the larger topology it should be far less risky to get someone to pay for the approximately 4-ish MW of fixed 1:2 ratio (but bidirectional current support) DC/DC converter that one would get out of a single tall-type wafer.space slice.
(The assumed 5x parallel EPC2019 per die amount to just over 9$ per such 5 in quantity. And that's just the semiconductors for the converter; it also needs a bunch of capacitors subjected to about 1% voltage ripple at a (possibly few) dozen MHz.
Sadly not really "cheap" but for reference, substation transformers in that power range had 2019 pricing around 100~150 kUSD.  But those are able to do higher ratios so feel free to adjust that by 4x for more comparable scale (assuming the DC/DC unit is segmented into 4 equal-power chunks with one set up for one W.S die in parallel in the stacks, and the others with 2/4/8 in parallel, to create an overall 1:16 voltage ratio).

There's a different topology for higher voltage ratios I have to look at again with the W.S driven EPC-co 200V GaN dies as assumption.
That's technically capable of buck-like down-regulation of operating voltage and the more complex phase-shift control would nominally give full suft-switching at least under compatible load.

I had meant to try a prototype of the topology for a microwave oven to do a monolithic boost-APFC & HVDC regulator (take in grid frequency or "alirack DC" at European voltages, emulate an ohmic resistor to the grid, turn the power into something the magnetron likes, provide good control over magnetron output power over at least a 100:1 range with over 10 dB of PSRR at DC w.r.t. targeted output power, to have an ability for accurate radiation dose control),
...but then I had to move and am now back on TinyTapeout MCML after I found out the project survived the efabless.


[05/10/2026 07:07] anfroholic
@peterkinget @xianglin_pu Nice logo!

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[05/10/2026 07:10] anfroholic
Beautiful @Tholin!! 
-# @kris

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[05/10/2026 10:19] tholin
Do you see this fill pattern in the background of my art? That’s not metal. I turned off all metal fills around my art. That is the COMP layer. Its diffusion. Somehow, you can see all the way down to the silicon behind the art.

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[05/10/2026 10:26] mole99
Yes, you can see that also around the wafer.space logo. Good to know for the next run :)


[05/10/2026 10:28] tholin
Indeed. I wonder if P and N type look different.


[05/10/2026 17:01] peterkinget
Credit goes to Cade Gleekel (see https://mosbius.org) who developed the logo.


[05/10/2026 17:01] peterkinget
SiO2 is glass so transparent 😉


[05/10/2026 17:09] tholin
I’m trying to get the SCL characterization scripts to work in a nix shell instead of the iic-osic-tools container and its failing because numpy won’t load

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[05/10/2026 17:10] tholin
But

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[05/10/2026 18:01] tholin
Its because I need to install lctime from my fork on git


[05/10/2026 18:01] tholin
And I don’t know how to properly do that in this context


[05/10/2026 18:04] tholin
Adding `git+https://codeberg.org/TholinVali/lctime.git` to `extra-python-packages` had no effect


[05/10/2026 18:52] mole99
`extra-python-packages` expects a Nix derivation, not a git URL. So you first need to create `lctime.nix` that uses your fork, and then you can use it in the Nix flake, afaik.
You can find some examples at nix-eda: https://github.com/fossi-foundation/nix-eda/tree/main/nix

Best to ask that question on [FOSSi Chat](https://fossi-chat.org), by the way. Donn, our Nix expert, might be able to help you :)

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https://github.com/fossi-foundation/nix-eda/tree/main/nix
nix-eda/nix at main · fossi-foundation/nix-eda
Nix flake for more up-to-date versions of EDA tools - fossi-foundation/nix-eda
2026-05_media/nix-eda-20CAD


[05/10/2026 21:49] ravenslofty
(I have come to have feelings about lctime...)


[05/10/2026 21:53] tholin
I tried not using nix and just installing the required packages directly into the ubuntu container


[05/10/2026 21:53] tholin
Since very few are required for this


[05/10/2026 21:54] tholin
But the version of magic that installs through apt is too old


[05/10/2026 21:54] tholin
And if I build magic from source, it somehow behaves differently than the version from the package manager?


[05/10/2026 21:56] tholin
I don’t think its parsing the environment variables in this

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[05/10/2026 21:56] dorythecat_v2
This actually happened to me on Fedora too. Turns out the magic repo for the package managers is a different repo than the "normal" one


[05/10/2026 21:56] dorythecat_v2
God knows why but the artifacts are built from what's effectively a different branch


[05/10/2026 21:57] dorythecat_v2
For Ubuntu just follow the instructions on Magic's website, it's your safest bet. I ended up doing an Ubuntu distrobox and that worked


[05/10/2026 21:58] tholin
I was missing the tcl and tk dev packages, I think


[05/10/2026 22:09] tholin
Look! No nix!

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[05/10/2026 22:09] tholin
Characterization is next, I already did all the prerequisite work

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[05/10/2026 23:49] tholin


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[05/10/2026 23:49] tholin
Its taking a bit


[05/11/2026 01:18] namibj
I almost accidentally made a broken DAC :ferrisBallSweatSpin:


[05/11/2026 01:20] namibj
deviated from binary radix in the wrong direction.... good thing alarm bells rung while trying to validate drive strength of SCL latches for use as bit feeds


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