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Another question about the OpenRAM config options: is there an option to control whether power grids are generated inside the SRAM? I saw these two options in the `options.py`
```route_supplies = "tree"
supply_pin_type = "ring"```
My guess is the tool by default will create the power grids with a power ring surrounding it, is it correct?
also what is the possible values for these options?

I don't recall the default, but OpenLane only works with a ring.

Thanks! When I check the gds I saw a ring in it

image.png

it also looks like it is using metal 1 for routing the powers to each sram cell:

<@U01TYK6V0LU> Yes, metal1 is used for that to connect the array locally.

Some metal 2 horizontally, if i recall correctly