search

efabless / caravel_user_project

https://caravel-user-project.readthedocs.io
Apache License 2.0
174 stars 326 forks source link

LVS error with default user_proj_example #105

Open proppy opened 2 years ago

proppy commented 2 years ago

Running flow.tcl on user_project_wrapper with the default user_proj_example (counter) result in the following error:

LVS reports:
    net count difference = 0
    device count difference = 0
    unmatched nets = 0
    unmatched devices = 0
    unmatched pins = 2
    property failures = 0

Total errors = 2

Versions

  magic              litex-hub/linux-64::magic-8.3.274_0_g47df9da-20220307_093930
  netgen             litex-hub/linux-64::netgen-1.5.219_0_ge11dbac-20220309_101211
  open_pdks.sky130a  litex-hub/noarch::open_pdks.sky130a-1.0.290_0_gc82996f-20220222_104027
  openroad           litex-hub/linux-64::openroad-2.0_3087_gcd06e5320-20220309_101211
OpenLane: 00da77e58c86a2fa745dafc2f4b277191cb8d3ac
caravel_user_project: afbb1601246c336b1c1e6cd87ecd85d9be8aa4d5
caravel-lite: 477c17fb986b0d3f7f3581e940095b68bd62422f
caravel_mgmt_soc_litex: 3fee299f8177cebf7919eb0e6da7f0f5ad7af31d
proppy commented 2 years ago

Also the same errors with mpw-5c tagged version:

OpenLane: 00da77e58c86a2fa745dafc2f4b277191cb8d3ac
caravel_user_project: b3ac77dd3737f2aa461199484538fd91c363deed mpw-5c
caravel-lite: 477c17fb986b0d3f7f3581e940095b68bd62422f mpw-5c
caravel_mgmt_soc_litex: 3fee299f8177cebf7919eb0e6da7f0f5ad7af31d mpw-5c

and earlier version of open_pdks and magic:

  magic              litex-hub/linux-64::magic-8.3.276_0_g083c0c1-20220309_101211
  open_pdks.sky130a  litex-hub/noarch::open_pdks.sky130a-1.0.284_0_g89d8afc-20220215_161633
proppy commented 2 years ago

Colab notebook that reproduces the issue: https://gist.github.com/proppy/b15a082e39c863a01202d76cc1f1ab51 https://colab.research.google.com/gist/proppy/b15a082e39c863a01202d76cc1f1ab51/caravel-user-project-lvs-errors-105.ipynb

d-m-bailey commented 2 years ago

@proppy I think I responded on slack, but this occurs when there are unconnected nets with the same label in a subcircuit. If the nets are connected in the parent hierarchy, the netlists should match. At the user_project_wrapper level, you might check your power mesh to be sure that nothing has been orphaned.

d-m-bailey commented 1 year ago

With netgen 1.5.228, I do not get an error. After 1.5.228, netgen doesn't handle implicit ports correctly.

@proppy can you check that no error occurs with netgen 1.5.228?

SaraEfabless commented 1 year ago

Proppy,

Can you check it with netgen 1.5.228 and let me know if its a valid issue or not?

jeffdi commented 10 months ago

Need to confirm if this error still exists with the current version of netgen. @proppy