klayout LVS isn't set up for sky130, is it?
# klayoutm
Matthew Guthaus
03/21/2023, 5:40 PMklayout LVS isn't set up for sky130, is it?
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Amro Tork
03/21/2023, 6:05 PM@Matthew Guthaus It is: https://github.com/efabless/sky130_klayout_pdk/tree/main/sky130_tech/tech/sky130/lvs
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Matthew Guthaus
03/21/2023, 6:05 PMFiling a bug that docopt isn't installed in openlane so it cannot be run.
Matthew Guthaus
03/21/2023, 6:06 PMPerfect, thanks for the pointer to that.
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Amro Tork
03/21/2023, 6:06 PMYou need to install docopt at your end.
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Matthew Guthaus
03/21/2023, 6:06 PMI'm trying to use the openlane docker image (for my class)
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Amro Tork
03/21/2023, 6:06 PMAmro Tork
03/21/2023, 6:06 PM Copy code
pip install -r requirements.txtm
Matthew Guthaus
03/21/2023, 6:07 PM(and not have them rebuild the entire docker image)
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Amro Tork
03/21/2023, 6:07 PMAh, I see
Amro Tork
03/21/2023, 6:07 PMI see
Amro Tork
03/21/2023, 6:07 PM@donn Could you please help with this?
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Matthew Guthaus
03/21/2023, 6:13 PMIs there a requirement for klayout version? I'm using 0.28.2 (from OpenLane) and it gives some errors:
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ERROR: Reading /openlane/sky130_klayout_pdk/sky130_tech/tech/sky130/lvs/sky130.lylvs: XML parser error: error occurred while parsing element in line 31, column 49
ERROR: Reading /openlane/sky130_klayout_pdk/sky130_tech/tech/sky130/lvs/sky130.lylvs: XML parser error: error occurred while parsing element in line 31, column 49a
Amro Tork
03/21/2023, 6:17 PMI'm not sure why you are getting this.
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Matthew Guthaus
03/21/2023, 6:18 PMHm, the sky130_layout_pdk directory structure seems odd compared to other klayout technologies
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Amro Tork
03/21/2023, 6:19 PMsky130_layout_pdk is just the source. I believe that Volare version of the PDK pulls the data from it.
Amro Tork
03/21/2023, 6:19 PM@donn @Tim Edwards?
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Matthew Guthaus
03/21/2023, 6:20 PMAh, so that is what is in openlane/pdks then
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Amro Tork
03/21/2023, 6:20 PMIt's installed from volare
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donn
03/21/2023, 6:20 PMIt's 8 PM here and I'm tired, I'll take a look tomorrow
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Amro Tork
03/21/2023, 6:21 PMVolare is the build platform for PDKs.
Amro Tork
03/21/2023, 6:21 PMOpenlane/pdk use volare pre-built pdks.
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Matthew Guthaus
03/21/2023, 6:21 PMyeah
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Amro Tork
03/21/2023, 6:21 PM@donn Please correct me if I'm wrong.
Amro Tork
03/21/2023, 6:21 PMYou should have the lvs in klayout folder in the pdk
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Matthew Guthaus
03/21/2023, 6:21 PMThis is why there is /openlane/pdks/volare/sky130/*
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Amro Tork
03/21/2023, 6:22 PMsky130/tech/klayout/drc
Amro Tork
03/21/2023, 6:22 PMand lvs should be there as well.
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Matthew Guthaus
03/21/2023, 6:22 PMThat is what I've been using
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Amro Tork
03/21/2023, 6:22 PMIf not, then I believe @Tim Edwards needs to add that to the build process.
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Tim Edwards
03/21/2023, 6:26 PMI just pull klayout files from the repository at efabless, which is the one that you (Amro) said that we should be using (in preference to the one under mabrains):
KLAYOUT_URL = <https://github.com/efabless/sky130_klayout_pdk>m
Matthew Guthaus
03/21/2023, 6:26 PMAh, there's some bugs in the sky130.lylvs file. There is a URL included, but it messes with the XML:
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30 # You should have received a copy of the GNU Affero General Public License
31 # along with this program. If not, see <<https://www.gnu.org/licenses/>>.Matthew Guthaus
03/21/2023, 6:27 PMThe error I get is on the "/" in the URL. It's thinking this is an XML tag ending...
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Amro Tork
03/21/2023, 6:29 PMThanks @Tim Edwards for confirming.
Amro Tork
03/21/2023, 6:29 PMThat's correct.
Amro Tork
03/21/2023, 6:29 PMCould tell the full path of the file that is causing this? @Matthew Guthaus
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Amro Tork
03/21/2023, 6:30 PMMay I ask you how you are running the LVS?
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Matthew Guthaus
03/21/2023, 6:31 PMI'm not yet. I'm just running klayout.
Matthew Guthaus
03/21/2023, 6:31 PMcd openlane
make mount
KLAYOUT_HOME=/openlane/pdks/sky130A/libs.tech/klayout klayout
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Amro Tork
03/21/2023, 6:34 PMThis file is used for allowing to run LVS from inside klayout and it's not properly tested.
Amro Tork
03/21/2023, 6:34 PMI think we could rename this file something else to avoid this issue and klayout will work
Amro Tork
03/21/2023, 6:34 PMBut you will have to use command line to run LVS.
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Matthew Guthaus
03/21/2023, 6:35 PMThere's also some errors referring to gdsfactory. Is that also a dependency?
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ERROR: /openlane/pdks/sky130A/libs.tech/klayout/pymacros/cells/via_generator.py:23: No module named 'gdsfactory'
/openlane/pdks/sky130A/libs.tech/klayout/pymacros/cells/via_generator.py:23
/openlane/pdks/sky130A/libs.tech/klayout/pymacros/cells/vias.py:21
/openlane/pdks/sky130A/libs.tech/klayout/pymacros/cells/__init__.py:22
/openlane/pdks/sky130A/libs.tech/klayout/pymacros/sky130.lym:9 (class ModuleNotFoundError)m
Mitch Bailey
03/21/2023, 11:22 PM@Matthew Guthaus before you spend too much time on klayout lvs, you might want to confirm that it can handle hierarchies with cells that do not match exactly. magic will virtually flatten mismatched cells and compare at the parent hierarchy.
@Amro Tork Do you have any test results in klayout with cells that don’t match at the cell level, but will match at a higher hierarchy when virtually flattened?
From the klayout web site
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Hierarchical analysis: KLayout got a hierarchical layout processing engine to support hierarchical LVS. Hierarchical processing means that boolean operations happen inside the local cell environment as far as possible. As a consequence, devices are recognized inside their layout cell and layout cells are turned into respective subcircuits in the netlist. The netlist compare will benefit as it is able follow the circuit hierarchy. This is more efficient and gives better debugging information in case of mismatches. As a positive side effect of hierarchical layout processing the runtimes for some boolean and other operations is significantly reduced in most cases.
Hierarchically stable: KLayout won't modify the layout's hierarchy nor will it introduce variants - at least for boolean and some other operations. This way, matching between layout and schematic hierarchy is maintained even after hierarchical DRC operations. Variants are introduced only for some anisotropic operations, the grid snap method and some other features which require differentiation of cells in terms of location and orientation.m
Matthew Guthaus
03/21/2023, 11:24 PM@Mitch Bailey I'm only using this for my class so that students can learn layout, DRC, and LVS at a cell level. Then use it to view layouts and debug errors.
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Matthew Guthaus
03/21/2023, 11:25 PMThe magic interface has been a large deterrent to new students, so I'm trying this instead.
Matthew Guthaus
03/21/2023, 11:27 PMAs an aside, I have LVS of SRAMs working in FreePDK45 using klayout, but I haven't yet used it for sky130. The flattening issue is quite annoying and I'm all too familiar with the limitation.
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Amro Tork
03/22/2023, 3:28 AM@Mitch Bailey That specific test, we didn’t test. But we have seen both failures on flat and hierarchical levels for small and large designs. We actually demonstrated the use of KLayout usage on a fullchip LVS.
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Mitch Bailey
03/22/2023, 7:05 AMOk. I assumed it was for openram.
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