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Published 20 hours ago • verified publisher icon The-OpenROAD-Project

Update nangate45 bp_quad clock period and uncertainty

Open jeffng-or opened this issue 3 months ago • 0 comments
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Description

Per discussion with Zhiang and Matt, the nangate45 bp_quad SDC should be updated to:

  • clock period 1.3
  • clock uncertainty 0.150

to match https://github.com/TILOS-AI-Institute/MacroPlacement/blob/main/Flows/NanGate45/bp_quad/constraints/bsg_chip.sdc and https://github.com/TILOS-AI-Institute/MacroPlacement/blob/main/Flows/NanGate45/bp_quad/scripts/cadence/run.sh.

The ORFS units are expressed in ns, since that's the time unit in https://github.com/The-OpenROAD-Project/OpenROAD-flow-scripts/blob/master/flow/platforms/nangate45/lib/NangateOpenCellLibrary_typical.lib. In other words, the "set_units -time ps" command is ignored in ORFS.

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jeffng-or avatar Aug 14 '25 22:08 jeffng-or