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Information / general / gf180mcu_as_sc_mcu7t3v3 vs. klayout
Between 08/31/2025 23:59 and 10/01/2025 00:00
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htamas 09/26/2025 08:16
08:16
We have a small block hardened with your library on the Tiny Tapeout GF 0p1 test shuttle. It works quite well with librelane. The only issue we had to fix were NP.2/PP.2 violations. The Nplus/Pplus layers are not drawn but autogenerated by magic and they don't take abutment into account. You can fix most cells by extending Nplus/Pplus to the cell boundary (or slightly over). The sole exception is the tap cell where I had to redraw a few layers.
08:17
This is the patched version we used:
gf180mcu_as_sc_mcu7t3v3.gds
302.67 KB
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Tholin 09/26/2025 08:20
Of course. Same issues as I had in sky130. Now I need to look up the magic properties to set the Nplus/Pplus sizes.
08:20
Its probably something like string MASKHINTS_NPLUS
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tnt 09/26/2025 08:21
it is.
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Tholin 09/26/2025 08:27
I am going to match up Nplus and Pplus to the size of the Pwell and Nwell and hope that works.
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Tholin 09/26/2025 08:43
Alright, I made a commit. I did try to automate the generation of the MASKHINTS lines, so please let me know if anything is wrong.
👍 2
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htamas 09/26/2025 10:59
The regular cells are good now, but the tap cell still has a couple of violations.
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Tholin 09/26/2025 11:07
Can you give me a DRC report?
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htamas 09/26/2025 12:02
tt_cell_macro_6.gds
1.31 MB
tt_cell_macro_6_main.lyrdb
1.5 MB
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Tholin 09/26/2025 12:44
Okay, another commit. Tap call might be fine now.
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htamas 09/26/2025 13:28
Not yet:
tt_cell_macro_6.gds
1.31 MB
tt_cell_macro_6_main.lyrdb
1.29 MB
13:29
One thing I'm seeing is that the Nplus/Pplus from the adjacent cells are now overlapping the region in which it is reversed in the tap cell.
13:32
By the way, you should also add a cdl file: https://github.com/htfab/ttgf0p1-pdk-snapshot/blob/main/gf180mcuD/libs.ref/gf180mcu_as_sc_mcu7t3v3/cdl/gf180mcu_as_sc_mcu7t3v3.cdl
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Tholin 09/26/2025 13:33
Is that just SPICE netlists?
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Tholin 09/26/2025 13:41
Okay, I updated my scripts to generate that too now
👍 1
13:42
I tried fixing the tap cell again, but I just have no way of testing my changes right now.
13:43
Also, these are klayout DRC errors, right? How are doing that? LibreLane on my end just says that KLayout DRC is not yet supported for gf180. (edited)
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Tholin
Also, these are klayout DRC errors, right? How are doing that? LibreLane on my end just says that KLayout DRC is not yet supported for gf180. (edited)
htamas 09/26/2025 14:15
python $PDK_ROOT/$PDK/libs.tech/klayout/drc/run_drc.py --variant=D --run_dir=drc --path=whatever.gds
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Tholin 09/26/2025 14:17
Awesome!
14:17
I’ll try that
👍 1
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