wafer.space Community - Pin Placement

Hi all. I’m using the template project to PnR some small digital modules and plan to integrate them into a larger analog block. I’m not using the template configs, just the Librelane environment. I have a question: how can I more precisely customize pin locations? Is there any script or config that lets me specify the absolute position of each pin on the floorplan? With pin_order.cfg I can only spread pins evenly along one side. Any help will be appreciated.

The easiest is to the the "DEF template" feature. See FP_DEF_TEMPLATE.

8:48 p.m.

Then you can write a DEF that define exact positions of the pins you want.

Thank you! Are there any DEF template files that I can use as a reference?

@Buck the caravel's user_project_wrapper uses one. https://github.com/chipfoundry/caravel_user_project/blob/main/openlane/user_project_wrapper/fixed_dont_change/user_project_wrapper_gf180mcu.def

caravel_user_project/openlane/user_project_wrapper/fixed_dont_chang...

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https://github.com/TinyTapeout/tt-support-tools/blob/main/tech/gf180mcuD/def/tt_block_1x1_pgvdd.def

tt-support-tools/tech/gf180mcuD/def/tt_block_1x1_pgvdd.def at main ...

Tiny Tapeout project build tools + chip integration scripts - TinyTapeout/tt-support-tools

8:42 a.m.

Tiny Tapeout above also use some and they're pretty minimal.

Thank for everyone's help!

If you have an abstract LEF (for example after LibreLane run with pin placement you would like to fix) you could easily make a template DEF from it with magic, like this. (edited)

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