I assume .mag is like .gds where they have arbitrary ordering of layers in them. It has no correlation to the physical layer order.

@User: Yes. Layer ordering in both the .mag and .tech files is arbitrary.

Ok, the first draft for my presentation is available now: https://docs.google.com/presentation/d/1WbFWVVg2Vp5ukKn7bW6Wy1NOAy03Qa4MYy3AW2KbOh4/edit?usp=sharing

set the channel topic: Channel for discussion about the parametric cell generation used by LibreSilicon's Standard Cell Library Generator (https://github.com/thesourcerer8/StdCellLib).

set the channel description: Channel for discussion about the parametric cell generation used by LibreSilicon's Standard Cell Library Generator (https://github.com/thesourcerer8/StdCellLib).

@User So the channel is restricted to the discussion about the LibreSilicon's Standard Cell Library Generator ? I thought it was initially about the various tools we could use to genenrate different type of cells (like analog cells) and not not standard cells ? (cf the presentation from @User )

My idea was not meant to be limited to my standard cell generator, but the scope is the whole analog design opensource community. (And I dont mind if commercial companies want to support the standard too)

@User -- You are more than welcome to fix it

I don't know if slack has permissions models?

@User -- There is also #bag for the Berkeley Analog Generator and #fasoc for the Fully Automated Analog stuff from UMich for other analog generators....

@User You can put them anywhere?

set the channel topic: Channel for discussion about the opensource parametric cell generation for designing analog and mixed signal cells. This is more generic than just the Skywater PDK.

I am not fully happy with the channel topic yet, so if anyone has better ideas how to name it...

I created a seperate channel for the Standard Cell Library Generator and the Build Reporting tool: #stdcelllib

It seems to be possible out-of-the-box with KiCad now. Posted in #general

So in KiCad we just need the parameters added in the GUI and in the fileformat, we should push to get that added in V6

@User great to see you here. I've been xschem quite a bit over the last week and I'm sold. Does everything I need plus a bit more. I wonder if maybe we should start a xschem channel to raise visibility and for discussion on items specific to it?

@User yes, i am so new to slack so i am lurking around without making too much noise. A xschem chanel should be optimal for xschem specific Q&A, feature requests/bug reports, etc.

Done, #xschem created

xschem handles parametric cells and hierarchy from time 0 of its development since i believe this is at the heart of vlsi design: circuit reuse needs all of that. the schematic shown in picture is netlisted in all formats with parameter assignments: example for VHDL (although no one will simulate a metal delay line in VHDL, this is just to show how it works).

...

...

begin

x7 : modello_metal3_single

generic map (

L => 2000 ,

W => 0.5

)

port map (

OUT => net1 ,

IN => INX1

);

...

...

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I have been researching the question of what parameters might be interesting to use a parametric generator for. One idea is to optimize the performance of the cells for subthreshold low power applications (e.g. 0.2v VDD). In this case you would want to scale the length of the transistors. In the 130nm case this will be to lengths between 250 and 400nm. This thesis has some nice tables on how choose the length according to whether the transistors are used in parallel or series. (page 75) : https://curve.carleton.ca/system/files/etd/00f4809f-4179-47aa-bef4-b3ec4c52a739/etd_pdf/8af702818519242fb79ecdb0447be0aa/ramezankhani-designingfastercmossubthresholdcircuitsutilizing.pdf

This more recent paper uses a different optimization metric and takes care of some details of a 130nm process. I am not sure which factors apply to Sky130 but they leave the length of pmos transistors alone: www.sciencedirect.com/science/article/pii/S0026269219301405

This library goes for efficiencies at near threshold offering a 6-track design: digital-library.theiet.org/content/journals/10.1049/iet-cds.2018.5542

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Hello

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