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ℹ️ - Information / ⁉️-questions / Other pad frame options
Between 2026-03-31 11:59 p.m. and 2026-05-01 12:00 a.m.
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Tim 'mithro' Ansell 2026-04-01 12:40 a.m.
@Matt G. (Mobius) - As @tnt says, you need to use the default pad ring if you want the CoB add-on, otherwise you are free to do what ever you want.
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Matt G. (Mobius) 2026-04-01 4:28 p.m.
Ok. What about the first part of the question? How do we generate the other pad frames? Will we have to add our own slot configurations etc?
4:33 p.m.
Was there a reason that we didn't use the max IO option for the CoB? It doesn't change the core area.
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tnt 2026-04-01 4:35 p.m.
The COB cost is per-bond-wire, more bond wire is more expensive.
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Leo Moser (mole99) 2026-04-01 6:03 p.m.
If you go for the 1x1 slot, you can simply change the PAD_* variables in this config: https://github.com/wafer-space/gf180mcu-project-template/blob/main/librelane/slots/slot_1x1.yaml However, you must ensure that the pad instances you are referencing exist in the RTL: https://github.com/wafer-space/gf180mcu-project-template/blob/main/src/chip_top.sv
gf180mcu-project-template/librelane/slots/slot_1x1.yaml at main · ...
Project template for wafer.space MPW runs using the gf180mcu PDK - wafer-space/gf180mcu-project-template
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gf180mcu-project-template/src/chip_top.sv at main · wafer-space/gf...
Project template for wafer.space MPW runs using the gf180mcu PDK - wafer-space/gf180mcu-project-template
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Tim 'mithro' Ansell 2026-04-03 12:31 a.m.
Some IO configuration experiments are displayed at https://mithro.github.io/gf180mcu-project-template/
12:32 a.m.
@Matt G. (Mobius) - As tnt said, the cost is a few cents per wire-bond, so too many IOs makes it more than the $1.50 USD budget
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