#1732 SYNTH_CHECKS_ALLOW_TRISTATE is not working. Issue created by hakan-demirli Description A gate level design using

sky130_fd_sc_hd__ebufn_2

and these environment variables fails at synthesis stage [STEP 1] because of multiple constant drivers error.

"SYNTH_READ_BLACKBOX_LIB": 1,
    "SYNTH_CHECKS_ALLOW_TRISTATE": 1

Expected Behavior It should pass. Tag

2023.03.12

is working without any problems Environment report

Kernel: Linux v5.15.0-69-generic
Distribution: ubuntu 22.04
Python: v3.10.6 (OK)
Container Engine: docker v23.0.3 (OK)
OpenLane Git Version: b43df386c586c67355af2b336b7501b437b46a1a
pip: INSTALLED
python-venv: INSTALLED
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PDK Version Verification Status: OK
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Git Log (Last 3 Commits)

b43df38 2023-04-10T17:33:21+02:00 Fix GDS write fail by KLayout (#1731) - Harald Pretl -  (grafted, HEAD -> master, origin/master, origin/HEAD)
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Git Remotes

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

Reproduction material bus.zip Relevant log output

Encountered check error:
Warning: multiple conflicting drivers for BUS.\TRI_BUS_A.Do0 [1]:
    port Z[0] of cell TRI_BUS_A.BUSO[1].OBUF0 (sky130_fd_sc_hd__ebufn_2)
    port Z[0] of cell TRI_BUS_B.BUSO[1].OBUF0 (sky130_fd_sc_hd__ebufn_2)

The-OpenROAD-Project/OpenLane