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Guild: wafer.space Community
Channel: Information / general / gf180mcu_as_sc_mcu7t3v3 vs. klayout
After: 08/31/2025 23:59
Before: 10/01/2025 00:00
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[09/26/2025 08:16] h.tamas



[09/26/2025 08:16] h.tamas
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.


[09/26/2025 08:17] h.tamas
This is the patched version we used:

{Attachments}
2025-09_media/gf180mcu_as_sc_mcu7t3v3-CA1EA.gds


[09/26/2025 08:20] tholin
Of course. Same issues as I had in sky130. Now I need to look up the magic properties to set the Nplus/Pplus sizes.


[09/26/2025 08:20] tholin
Its probably something like `string MASKHINTS_NPLUS`


[09/26/2025 08:21] 246tnt
it is.


[09/26/2025 08:27] tholin
I am going to match up Nplus and Pplus to the size of the Pwell and Nwell and hope that works.


[09/26/2025 08:43] tholin
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.

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[09/26/2025 10:59] h.tamas
The regular cells are good now, but the tap cell still has a couple of violations.


[09/26/2025 11:07] tholin
Can you give me a DRC report?


[09/26/2025 12:02] h.tamas


{Attachments}
2025-09_media/tt_cell_macro_6-2A918.gds
2025-09_media/tt_cell_macro_6_main-57F9C.lyrdb


[09/26/2025 12:44] tholin
Okay, another commit. Tap call might be fine now.


[09/26/2025 13:28] h.tamas
Not yet:

{Attachments}
2025-09_media/tt_cell_macro_6-12986.gds
2025-09_media/tt_cell_macro_6_main-17F18.lyrdb


[09/26/2025 13:29] h.tamas
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.


[09/26/2025 13:32] h.tamas
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


[09/26/2025 13:33] tholin
Is that just SPICE netlists?


[09/26/2025 13:41] tholin
Okay, I updated my scripts to generate that too now

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[09/26/2025 13:42] tholin
I tried fixing the tap cell again, but I just have no way of testing my changes right now.


[09/26/2025 13:43] 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.


[09/26/2025 14:15] h.tamas
`python $PDK_ROOT/$PDK/libs.tech/klayout/drc/run_drc.py --variant=D --run_dir=drc --path=whatever.gds`


[09/26/2025 14:17] tholin
Awesome!


[09/26/2025 14:17] tholin
I’ll try that

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