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The-OpenROAD-Project / OpenLane

OpenLane is an automated RTL to GDSII flow based on several components including OpenROAD, Yosys, Magic, Netgen and custom methodology scripts for design exploration and optimization.
https://openlane.readthedocs.io/
Apache License 2.0
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No via inserted -> Unconnected PDN node #2102

Closed scorbetta closed 2 months ago

scorbetta commented 6 months ago

Description

My design consists of two hierarchical blocks MACRO and TOP. The MACRO block is hardened first, with power ring enabled; the flow is then run on TOP block which instantiates one instance of MACRO.

The following messages appear:

[ERROR]: during executing openroad script /openlane/scripts/openroad/pdn.tcl
[ERROR]: Log: designs/TEST_MACRO_TOP/runs/run1/logs/floorplan/7-pdn.log
[ERROR]: Last 10 lines:
[WARNING PSM-0038] Unconnected PDN node on net vccd1 at location (48.720um, 293.440um), layer: met5.
[WARNING PSM-0038] Unconnected PDN node on net vccd1 at location (48.720um, 230.710um), layer: met4.
[WARNING PSM-0038] Unconnected PDN node on net vccd1 at location (48.720um, 230.710um), layer: met5.
[WARNING PSM-0038] Unconnected PDN node on net vccd1 at location (48.720um, 77.530um), layer: met4.
[WARNING PSM-0038] Unconnected PDN node on net vccd1 at location (48.720um, 77.530um), layer: met5.
[WARNING PSM-0038] Unconnected PDN node on net vccd1 at location (48.720um, 54.080um), layer: met4.
[WARNING PSM-0038] Unconnected PDN node on net vccd1 at location (48.720um, 54.080um), layer: met5.
[ERROR PSM-0069] Check connectivity failed.
Error: pdn.tcl, 43 PSM-0069
child process exited abnormally

[ERROR]: Creating issue reproducible...

Expected Behavior

Power ring properly connected.

Environment report

open_pdks cd1748bb197f9b7af62a54507de6624e30363943
WARNING: issue-survey appears to be running inside the OpenLane
container.

This makes it difficult to rule out issues with your
environment.

Unless instructed specifically to do so, please run this command
outside the OpenLane container.
---

Kernel: Linux v6.5.0-25-generic
Distribution: centos 7
Python: v3.6.8 (OK)
OpenLane Git Version: 9dbd8b5ea2bd891bed4dcc97df5c7439083f0368
python-venv: INSTALLED
---
PDK Version Verification Status: OK
---
Git Log (Last 3 Commits)

9dbd8b5e 2024-01-11T15:26:56+02:00 Fix `-synth_explore` crash (#2085) - Kareem Farid -  (HEAD, tag: 2024.01.12, origin/master, origin/HEAD, master)
a005df1f 2024-01-08T10:51:06+02:00 Updated link to newer version of spanish docs (#2082) - Laboratorio de Investigación en Microelectrónica y Arquitectura de Computadoras, EIE -- UCR -  (tag: 2024.01.09)
8bea8c51 2023-12-26T13:17:21+02:00 Update `OpenROAD` (#2062) - Kareem Farid -  (tag: 2023.12.27)
---
Git Remotes

origin  git@github.com:The-OpenROAD-Project/OpenLane.git (fetch)
origin  git@github.com:The-OpenROAD-Project/OpenLane.git (push)

Reproduction material

issue_reproducible.tar.gz

Relevant log output

[WARNING PSM-0038] Unconnected PDN node on net vccd1 at location (301.060um, 293.440um), layer: met4.
[WARNING PSM-0038] Unconnected PDN node on net vccd1 at location (301.060um, 293.440um), layer: met5.
[WARNING PSM-0038] Unconnected PDN node on net vccd1 at location (301.060um, 230.710um), layer: met4.
[WARNING PSM-0038] Unconnected PDN node on net vccd1 at location (301.060um, 230.710um), layer: met5.
[WARNING PSM-0038] Unconnected PDN node on net vccd1 at location (301.060um, 77.530um), layer: met4.
[WARNING PSM-0038] Unconnected PDN node on net vccd1 at location (301.060um, 77.530um), layer: met5.
[WARNING PSM-0038] Unconnected PDN node on net vccd1 at location (301.060um, 54.080um), layer: met4.
[WARNING PSM-0038] Unconnected PDN node on net vccd1 at location (301.060um, 54.080um), layer: met5.
[WARNING PSM-0038] Unconnected PDN node on net vccd1 at location (225.440um, 293.440um), layer: met4.
[WARNING PSM-0038] Unconnected PDN node on net vccd1 at location (225.440um, 293.440um), layer: met5.
[WARNING PSM-0038] Unconnected PDN node on net vccd1 at location (225.440um, 230.710um), layer: met4.
[WARNING PSM-0038] Unconnected PDN node on net vccd1 at location (225.440um, 230.710um), layer: met5.
[WARNING PSM-0038] Unconnected PDN node on net vccd1 at location (225.440um, 77.530um), layer: met4.
[WARNING PSM-0038] Unconnected PDN node on net vccd1 at location (225.440um, 77.530um), layer: met5.
[WARNING PSM-0038] Unconnected PDN node on net vccd1 at location (225.440um, 54.080um), layer: met4.
[WARNING PSM-0038] Unconnected PDN node on net vccd1 at location (225.440um, 54.080um), layer: met5.
[WARNING PSM-0038] Unconnected PDN node on net vccd1 at location (71.840um, 293.440um), layer: met4.
[WARNING PSM-0038] Unconnected PDN node on net vccd1 at location (71.840um, 293.440um), layer: met5.
[WARNING PSM-0038] Unconnected PDN node on net vccd1 at location (71.840um, 230.710um), layer: met4.
[WARNING PSM-0038] Unconnected PDN node on net vccd1 at location (71.840um, 230.710um), layer: met5.
[WARNING PSM-0038] Unconnected PDN node on net vccd1 at location (71.840um, 77.530um), layer: met4.
[WARNING PSM-0038] Unconnected PDN node on net vccd1 at location (71.840um, 77.530um), layer: met5.
[WARNING PSM-0038] Unconnected PDN node on net vccd1 at location (71.840um, 54.080um), layer: met4.
[WARNING PSM-0038] Unconnected PDN node on net vccd1 at location (71.840um, 54.080um), layer: met5.
[WARNING PSM-0038] Unconnected PDN node on net vccd1 at location (48.720um, 293.440um), layer: met4.
[WARNING PSM-0038] Unconnected PDN node on net vccd1 at location (48.720um, 293.440um), layer: met5.
[WARNING PSM-0038] Unconnected PDN node on net vccd1 at location (48.720um, 230.710um), layer: met4.
[WARNING PSM-0038] Unconnected PDN node on net vccd1 at location (48.720um, 230.710um), layer: met5.
[WARNING PSM-0038] Unconnected PDN node on net vccd1 at location (48.720um, 77.530um), layer: met4.
[WARNING PSM-0038] Unconnected PDN node on net vccd1 at location (48.720um, 77.530um), layer: met5.
[WARNING PSM-0038] Unconnected PDN node on net vccd1 at location (48.720um, 54.080um), layer: met4.
[WARNING PSM-0038] Unconnected PDN node on net vccd1 at location (48.720um, 54.080um), layer: met5.
[ERROR PSM-0069] Check connectivity failed.
kareefardi commented 6 months ago

@scorbetta I think this is a false positive by check_power_grid. There are vias at the corners of the power ring of the macro, where the tool is complaining, and it seems to be connected. Can you continue the flow with FP_PDN_CHECK_NODES disabled and see if you get any other errors?

scorbetta commented 6 months ago

@kareefardi Thanks, the flow runs to completion.

kareefardi commented 6 months ago

@scorbetta Great. I will keep this issue open to better understand the false positive from OpenROAD.

kareefardi commented 2 months ago

Can no longer reproduce the problem with OpenLane a0e805e70f9dca8e80286ed807195008a2fc36c0