open-source-silicon.dev

I'm also a bit confused about the power ring configuration. Looking at the `caravel_openframe_project` project, you have some config in `openlane/openframe_project_wrapper/fixed_dont_change/fixed_wrapper_cfgs.tcl` that explicitely says "DONT CHANGE" ... and then in `openlane/openframe_project_wrapper/config.json` those values are overwritten ... so which one are the right one ?!?

The `caravel_openframe_project` has a setup that I attempted to do early on.  I think some of those were just copied from `caravel_user_project` and adapted.  The `caravel_user_project` has strict requirements on the PDN ring because it has to match up between the user project and the caravel chip.  That wouldn't apply to the openframe.  Also I don't think the die area and core area matter that much as long as the area overlaps the pins on the frame, so the difference of a few microns is probably not relevant.  Just make sure that you're picking up the repository fork from <https://github.com/efabless/openframe_project_wrapper> which is the one that went through timing signoff.

Well this is for TinyTapeout and getting hardened with OpenLane2 and a pretty custom setup so I'm trying to copy the stuff that matters.

copying the config from the `config.json` get very large rings but they also get "outside" of the official `DIE_AREA`  so I'm not entirely sure that's valid.

Is there somewhere an "empty" OpenFrame GDS so I can see what ends up  "around" me ?

Ultimately, <@U01634FV755> is the one who knows what the correct settings are for the example openframe project.

I guess there was never a GDS of `caravel_openframe`  put in the `gds/` directory of the `caravel/` project.---Top level cells in the `gds/` directory aren't used and are just taking up repository space.  The final integration step uses `mag/caravel_openframe.mag`.  You can view that in magic, and if you prefer klayout, then just read it into magic long enough to write out a GDS file.

Mmm, I think I see my mistake, I thought the `CORE_AREA` was only affecting the generation of the standard cell grid, but that's also what will end up being used for the origin of the rings.