Overview

This repository runs the following pipecleaner designs through a digital physical design flow using Design Compiler and Innovus with the SkyWater open source 130nm PDK.

• GcdUnit - computes the greatest common divisor function, consists of 100-200 gates
• SramWrapper - uses an OpenRAM generated SRAM (to be added soon)

Setup

To run this flow, please install the following dependencies first:

• skywater-pdk

Get SkyWater PDK:

git clone https://github.com/google/skywater-pdk.git
cd skywater-pdk

The cell libraries are in submodules that need to be checked out independently:

git submodule update --init libraries/sky130_fd_sc_hd/latest

To create liberty files, go into the skywater-pdk directory and do:

make timing

• mflowgen - This is a tool to create ASIC design flows in a modular fashion. Follow the setup steps at https://github.com/mflowgen/mflowgen.

• skywater-130nm-adk - This repo has some scripts that convert the SkyWater PDK into the format that mflowgen expects.

Using the Pipecleaners

First, make sure you update various install paths the setup.bashrc file. Then source it.

Next, enter into the build directory of the pipecleaner you want to run, and run the following:

$MFLOWGEN_HOME/configure --design ../design/

Helpful make Targets

• make list - list all the nodes in the graphs and their corresponding step number
• make status - list the build status of all the steps
• make graph - generates a PDF of the graph
• make N - runs step N
• make clean-N - removes the folder for step N, and sets the status of steps [N,) to build
• make clean-all - removes folders for all the steps
• make runtimes - lists the runtime for each step