open-source-silicon.dev

<@U069XNVQM4H> is there an update on the missing Cont areas in the IO cells?

Yes we have some updates on that. The good news is we also received the measurements results of the IO cells taped out in Dec 2023 and we do not see major issues. Currently we are elaborating documentation on that. Please move also to <http://fossi-chat.org|fossi-chat.org> we will gradually move all the discussions there

Do you think we can make this design rule check recommended?

we only check minimal set of the DRC when we accept the designs. I do not remember if this Latchup rules are part of it

it's part of the maximal only. My goal is to run my i2c-gpio-expander against ORFS master and OpenPDK dev repos every night and check for DRC issues, etc. ... not possible with those errors right now.

I just opened a PR to disable them via KLayout

<https://github.com/IHP-GmbH/IHP-Open-PDK/pull/379> check this out

didn't you say I can use GDS files directly from the Open PDK instead of ORFS?

```export TECH_LEF = $(PDK_ROOT)/$(PDK)/libs.ref/sg13g2_stdcell/lef/sg13g2_tech.lef
export SC_LEF =   $(PDK_ROOT)/$(PDK)/libs.ref/sg13g2_stdcell/lef/sg13g2_stdcell.lef

export LIB_FILES = $(PDK_ROOT)/$(PDK)/libs.ref/sg13g2_stdcell/lib/sg13g2_stdcell_typ_1p20V_25C.lib \
	                  $(ADDITIONAL_LIBS)
export GDS_FILES = $(PDK_ROOT)/$(PDK)/libs.ref/sg13g2_stdcell/gds/sg13g2_stdcell.gds \
	                  $(ADDITIONAL_GDS)```

this is the wav to do so in `platform/ihp-sg13g2/config.mk`

Ah, thanks for pointing that out :slightly_smiling_face:

Sorry I got lost with these PR about IO and latch-up could you please give some more context ?

I will try these new gds files later.

Problem: sg13g2_maximal.lydrc reported LU.d and LU.d1 errors because Cont was missing in IO cells. I think these latch-up rules are more interesting for analog designs since digital chips should use standard cells only. That's why I thought I could simply disable these latch-up rules. However, I prefer to have fixed IO cells and as many rules as possible included.

"<https://github.com/KrzysztofHerman|@KrzysztofHerman> I think we can close that with <https://github.com/IHP-GmbH/IHP-Open-PDK/pull/379|#379>"  this is your comment on gh. Do you want to close PR and Issue or only issue ?

ah okay sorry. I think it's up to you if you want latch-up checks optional not. I mean it doesn't hurt to have this flag in the DRC file

The flag is ok, I will evaluate how it works and probably accept. My question is about #379

Oh, i meant the pull request with the flag can be closed. Not #379

but #379 generates quite some issues in my design

<@U073WEG1PEV> I have dropped it there was some mistake there. We will make PR again

perfect, just started a new check ... should be done in 30 minutes