| [](https://github.com/mattvenn/tinytapeout-mpw7/actions/workflows/tinytapeout.yaml) |
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| # TinyTapeout |
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| See https://tinytapeout.com for more information on the project and how to get involved. |
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|  |
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| # Instructions to build |
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| ## Fetch all the projects |
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| ./configure --update-projects |
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| ## Configure Caravel |
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| ./configure --update-caravel |
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| ## Build the GDS |
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| make user_project_wrapper |
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| ## Dev notes |
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| * 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 |
