The-OpenROAD-Project
ifp: initialize_floorplan should accept lower bound for relative sizing
Description
When using floorplan relative floorplan
initialize_floorplan -utilization
for "very small" design pdngen or placement can fails with the following errors:
[ERROR PDN-0185] Insufficient width (16.128 um) to add straps on layer K3 in grid "top" with total strap width 13.108 um and offset 6.4 um.
[ERROR GPL-0302] Use a higher -density or re-floorplan with a larger core area.
Given target density: 0.80
Suggested target density: 0.98
Error: place.tcl, 455 GPL-0302
Looking at the implementation: https://github.com/The-OpenROAD-Project/OpenROAD/blob/c2b1d565be57e0d41cb488d78ed5e4977e0c4235/src/ifp/src/InitFloorplan.cc#L119-L123 it doesn't appear that there is a way to specify a lower bound for automated sizing.
Suggested Solution
It would be nice if initialize_floorplan accepted two additional parameter for specifying lower bound of core area width and height.
Additional Context
No response
How would a user know what to set those args to?
I thought those could be derived from some multiple of the average standard cell size for a given PDK?
but maybe @QuantamHD have some better ideas?