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Thread: gf180 tapeout template drc error

12 Discord messages from ℹ️ - Information/⁉️-questions/threads/gf180-tapeout-template-drc-error.md.

Category: ℹ️ - Information Parent channel: #⁉️-questions Thread ID: 1441513679030845470

Messages: 12

message-1441513679030845470

2025-11-21T19:40:43.11+00:00 — Evansika (@xintingjiang_36756)

Content

When I run the DRC check using the provided GF180 project template in the Nix shell enviornment (with only the pad rings included) encountered about 104 errors. One example is shown in the attached image. I wanted to confirm whether we are expected to debug these errors ourselves, or if they may be related to the provided pad-ring macros.

Thanks!

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message-1441577925404000317

2025-11-21T23:56:00.639+00:00 — Tim 'mithro' Ansell (@mithro_)

Content

@Leo Moser (mole99)
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message-1441688869472043122

2025-11-22T07:16:51.766+00:00 — Leo Moser (mole99) (@mole99)

Content

@Evansika That looks like an error I had already fixed. Could you please verify that your PDK is up to date?
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message-1441820739782049833

2025-11-22T16:00:52.098+00:00 — Evansika (@xintingjiang_36756)

Content

Yes, it passed when i updated the pdk. Thanks!

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message-1442359076703961263

2025-11-24T03:40:01.622+00:00 — Evansika (@xintingjiang_36756)

Content

Oh i found that i still got 11 antenna violations with the empty template with pad frame. Are these critical?

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message-1442418091316347001

2025-11-24T07:34:31.802+00:00 — Leo Moser (mole99) (@mole99)

Content

@Evansika Did you update your template repo as well?
The antenna violations in the default template have been fixed with this PR: https://github.com/wafer-space/gf180mcu-project-template/pull/24
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message-1442607241055441060

2025-11-24T20:06:08.614+00:00 — Evansika (@xintingjiang_36756)

Content

Thanks for the heads up. Now I update the template as well as the pdk repo. But now I am encountering the following DRC issues(LVS and antenna errors are clean). I am running on my M4 MAC in the nix environment, when I launch the nix shell, there were 2 skip and 1 fail see attached, I am not sure if this has something to do with the drc errors.

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message-1442640439156150332

2025-11-24T22:18:03.658+00:00 — LukeW (@luke_w)

Content

I also get magic/klayout XORs on my macbook but not on my Linux desktop
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message-1442640673596506172

2025-11-24T22:18:59.553+00:00 — LukeW (@luke_w)

Content

for now just working around it by using the Linux machine when I care about DRC.  Is that an option for you OP?
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message-1442640911321268406

2025-11-24T22:19:56.231+00:00 — LukeW (@luke_w)

Content

Also all of the magic DRCs I get are just complaints about filler cells being placed on top of themselves. As far as I'm aware this is harmless and other people have reported it too.
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message-1442717378105442451

2025-11-25T03:23:47.333+00:00 — Evansika (@xintingjiang_36756)

Content

yes it works on linux. We will run on Linux when it comes to drc. Thanks!
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message-1442789332787134566

2025-11-25T08:09:42.666+00:00 — Leo Moser (mole99) (@mole99)

Content

The difference between macOS and Linux is unexpected and strange.
But then again, we're running LibreLane `dev` with updated OpenROAD, so some issues might be expected.

@Evansika Could you open an issue in [gf180mcu-project-template](https://github.com/wafer-space/gf180mcu-project-template) so we can keep track of this?

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