Min metal area ignored by ORFS (DRC error)

[alpamps]

Subject

[Stage]: Other. Please describe below.

Describe the bug

I am trying to make a circuit with ORFS but it is not DRC clean and they are many metal stubs.

I also tried to run the example for gcd with ihp-sg13g2 pdk. After the flow is completed successfully, final gds file has many wire stubs (Metal2,etc.) which are smaller than the minimum metal area (0.144um^2). Changing minimum metal area in sg13g2_tech.lef didn't fix the problem.

Expected Behavior

The final design should be DRC clean, no metal stubs smaller than 0.144um^2

Environment

output from /OpenROAD-flow-script/env.sh:

OPENROAD: /OpenROAD-flow-scripts/tools/OpenROAD

To Reproduce

1. clone the repo: https://github.com/The-OpenROAD-Project/OpenROAD-flow-scripts.git
2. run docker: docker run --rm -it -u $(id -u ${USER}):$(id -g ${USER}) -v $(pwd)/flow:/OpenROAD-flow-scripts/flow openroad/flow-ubuntu22.04-builder
3. uncomment gcd example in /flow/Makefile
4. make
5. check 6_final.gds file

Relevant log output

No response

Screenshots

Additional Context

No response

[maliberty]

How do you "check 6_final.gds file"?

[alpamps]

How do you "check 6_final.gds file"?

You can open the 6_final.gds file with klayout and show only metal2 layer. Then you will notice many wire stubs with small size (some with area < 0.06um2.

p.s. DRC also fails due to this issue. Thanks!