TinyTapeout

See https://tinytapeout.com for more information on the project and how to get involved.

tiny tapeout

Instructions to build

./configure --update-projects

./configure --update-caravel

make user_project_wrapper

PDN hang issues https://github.com/The-OpenROAD-Project/OpenLane/issues/1173
Also discovered PDN hangs if extra lefs/defs are not deduplicated
with PDN set so dense, tapeout job fails with density checks
with unused PDN straps turned off, precheck fails
copied the erased version (just power rings) and deleted the first digital power rings, copy pasted that over final gds
precheck fails with missing power ports
manually added missing power ports to gl verilog of user_project_wrapper
precheck passes. Will try tapeout job
tapeout job failed with DRC, was because outer power ring was too thin. I think due to configuration rather than being cutoff for precheck
updated missing_power_rings with correct rings and repeated, this time tapeout passes
Tim suggests doing this as a module/cell to make it easier to reproduce
Maximo suggests editing pdn_cfg.tcl and using the -nets option with add_pdn_stripe to force only 1st voltage domain
This worked, see the new openlane/user_project_wrapper/pdn_cfg.tcl config