Hi all, I am about to install the gf180 pdk and am...
# gf180mcud
Diarmuid Collins
04/25/2024, 9:11 PMHi all, I am about to install the gf180 pdk and am wondering what sigma process is it? 3 I presume. Also, are they 1k/sq poly resistors available in the open source pdk? I hear there are 3 variants - A, B and C. Are all those available? If so, what do people generally reccomend and does the choice of A, B or C impact how I download / install the pdk? Thanks
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Amro Tork
04/26/2024, 6:58 AMD variant is the one used for tapeout.
Amro Tork
04/26/2024, 6:58 AMPDK installation installs all 4 variants
Amro Tork
04/26/2024, 6:58 AMPlease use volare for installation
Amro Tork
04/26/2024, 6:59 AMd
Diarmuid Collins
04/26/2024, 7:59 AMHi Amro, I was intending cloning from github and following the installs instructions at: http://opencircuitdesign.com/open_pdks/
Diarmuid Collins
04/26/2024, 8:00 AMWhat is the difference between doing it this way and using volare? Which is the preferred or standard way everyone does it?
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Amro Tork
04/26/2024, 9:56 AMOpen_pdks builds the PDK. Volare is output of open_pdks. Instead of wasting the time building the PDK, you get it pre-built. Also, there is versioning related issues and compatibility that you need to take into account. Open_pdks default action takes the latest version of every part of the PDK. But volare is carefully handled to align correct versions.
Basically, volare is known good builds of Open_pdk
Amro Tork
04/26/2024, 9:58 AMRecommended action is to use volare always. And if facing issues we notify Efabless team to modify the versions
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Diarmuid Collins
04/26/2024, 1:08 PMGreat! I'll use volare so. Thanks for the advice.
Diarmuid Collins
04/26/2024, 8:17 PMDiarmuid Collins
04/26/2024, 8:20 PM2m40s into the video, the author sets the following variable: export PDK-gf180mcuC .... as the author is interested in using variant C. Since variant D is the one used for tapeout, I guess I change the variable to: export PDK-gf180mcuD?
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Amro Tork
04/27/2024, 3:24 AM@Diarmuid Collins You could use whatever variant you want. D was the one used for the last shuttle. I don’t know if they will have another shuttle or not.
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Diarmuid Collins
04/28/2024, 9:12 PMThats interesting. I assumed these shuttles are running continuously. If there is not another shuttle there would be no point in me downloading this pdk. But if there is no other shuttle, wouldnt that mean this GF180 open source pdk effort is no longer happening? But Im sure this is not the case. Where can I go to dig into this further to get info on if and when the next shuttles are running? Im planning to T/O a testchip at the end of next year and last thing I want is for my foundry to suddenly stop running shuttles. Thanks.
Diarmuid Collins
04/28/2024, 9:32 PMTo expand a bit more on my question. The following link gives details about the open source shuttle. https://efabless.com/open_shuttle_program. However, the design needs to be open source to qualify for this. However, suppose I want to submit a design using open source tools, but the design itself cannot be made publicly available i.e. open source. Is it possible to still submit the design to the gf180mcu process? It would no longer qualify for the free submission but that would not be an issue.
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Amro Tork
04/29/2024, 3:14 AM@Tim Edwards
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Diarmuid Collins
04/29/2024, 6:12 AMThanks Amro. As this question is rooted way down in our thread I have reposted to the main forum for better visibility.
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Tim Edwards
04/29/2024, 1:54 PMAnd I answered in the main forum.
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