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The-OpenROAD-Project / OpenLane

OpenLane is an automated RTL to GDSII flow based on several components including OpenROAD, Yosys, Magic, Netgen and custom methodology scripts for design exploration and optimization.
https://openlane.readthedocs.io/
Apache License 2.0
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Running global placement through detailed routing given only lef/def #975

Closed njkrichardson closed 2 years ago

njkrichardson commented 2 years ago

Hi there,

Many of the global/detailed placement tools (e.g., RePlAce, OpenDP) and global/detailed routing tools (e.g., cu-gr, TritonRoute) are designed with submission to ISPD competitions in mind. Typically these competitions are not concerned with chip synthesis; and provide only an lef/def.

Given just an lef/def for a design, how can I run global placement, detailed placement, global routing, and detailed routing via the interactive flow?

Note: not "merged lef"

maliberty commented 2 years ago

For the tools that are part of openroad you can just use it directly if you want to benchmark. For example we regularly run the ispd routing benchmarks with https://github.com/The-OpenROAD-Project/OpenROAD/blob/master/src/drt/test/run-ispd.py

njkrichardson commented 2 years ago

Cheers for the response. Two follow up questions if you don't mind.

  1. I've built the OpenLane project but not OpenRoad, is it possible to run the script you link using OpenLane, or do I additionally need to build OpenRoad?
  2. I appreciate the benchmark script, although for further context I have my own lef/def pairs for custom chip designs that I'd like to place and route. Is there a way to accomplish this for generic lef/def design pairs rather than the ispd designs specifically?
maliberty commented 2 years ago

OL includes OR so you can use it from there. I'm just saying you don't need to use the OL flow scripts.

The script shows the TCL script it generates to run the benchmark at https://github.com/The-OpenROAD-Project/OpenROAD/blob/944855835623e651e7b9c7c50efcce1fb04b4fee/src/drt/test/run-ispd.py#L83

you can do something similar with your lef/def.

njkrichardson commented 2 years ago

Thanks again very much. I just attempted to run the script using OpenROAD/src/drt/test as the benchmark directory, but it seems ispd18_test1 is missing. Is there an additional step required to download and/or configure the benchmarks?

njkrichardson commented 2 years ago

Also, can you confirm whether this script just routes, or places and routes? Thank you! I found a script to run a test with RePlAce in OpenROAD/src/gpl/test/testcase as well, although I'm not sure how to run that one.

maliberty commented 2 years ago

That script just routes. It wouldn't be hard to add placement commands to it.

You can get the test cases from https://ispd.cc/ispd2022/index.php?page=contests (2018 & 2019 are routing).