TinyTapeout
See https://tinytapeout.com for more information on the project and how to get involved.
Instructions to build
Fetch all the projects
./configure --update-projects
Configure Caravel
./configure --update-caravel
Build the GDS
make user_project_wrapper
Dev notes
- 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
