Quantum Layout Design Environment

The next-generation object-oriented script-based PCell design environment.
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About The Project

SPiRA is the next-generation object-oriented script-based PCell design environment. The framework leverages the Python programming language to effectively generate circuit layouts, while simultaneously checking for design violations, through a novel methodology called validate-by-design. Creating PCells and extracting a model from a layout requires data from the fabrication process. A new PDK scheme is introduced, called the Rule Deck Database (RDD), that effectively connects process data to the SPiRA framework. The design of the RDD revolves around the principle that a PDK cannot be created, but rather that it evolves as our understanding of physical layout design evolves.

Getting Started

This is an example of how you may give instructions on setting up your project locally. To get a local copy up and running follow these simple example steps.

Prerequisites

Clone or download the SPiRA source code into a directory of your choice.

This is an example of how to list things you need to use the software and how to install them in CentOS 7:

1. We need to install the latest C++ compiler and some libraries.

   sudo yum install epel-release
   sudo yum update
   sudo yum install centos-release-scl
   sudo yum install devtoolset-9
   sudo yum install \
   	libffi-devel \
       openssl-devel \
       readline-devel \
       sqlite-devel \
       libGL-devel \
       libGLU-devel \
       fltk-devel \
       zlib-devel \
       bzip2-devel \
       ncurses-devel \
       tk-devel \
       gdbm-devel \
       db4-devel \
       libpcap-devel \
       xz-devel \
       sqlite

2. We need at least Python 3.8 or above, but CentOS 7 repositories only provide 3.6:

   curl https://pyenv.run | bash

   Now edit the ~/.bashrc file and add the following lines at the bottom:

   export PYENV_ROOT="$HOME/.pyenv"
   export PATH="$PYENV_ROOT/bin:$PATH"
   eval "$(pyenv init --path)"
   eval "$(pyenv virtualenv-init -)"

   Now execute:

   exec $SHELL -l
   pyenv install 3.8.7
   pyenv global 3.8.7

3. We need a working copy of gmsh but the one provided by Python Pip requires a newer C ABI (application binary interface) than the one provided by CentOS 7. So let's do some magic. First download the gmsh source code using git:

   mkdir Development
   cd Development
   git clone https://gitlab.onelab.info/gmsh/gmsh.git
   cd gmsh
   scl enable devtoolset-9 bash
   pip install cmake
   mkdir build
   cd build
   cmake -DENABLE_BUILD_DYNAMIC=1 ..
   make
   sudo make install
   sudo touch /etc/ld.so.conf.d/gmsh_x86_64.conf
   sudo bash -c 'echo "/usr/local/lib64">>/etc/ld.so.conf.d/gmsh_x86_64.conf'
   sudo ldconfig

   This will enable the gmsh command to open up GMSH.

Installation

To install SPiRA, please follow these steps:

1. In the directory where this README.md file is found execute the following:

   pip install -r requirements.txt

   This will install the Python Pip version of gmsh needed for the import gmsh command, but will not work because of of the wrong CXX_ABI.

2. To fix this run python and type in the following:

   import gmsh

   This will give the warning about the wrong ABI and give the location of the libgmsh.so file that does not comply.

3. Simply replace the infringing file with the one built earlier from source:

   cp ~/Development/gmsh/build/libgmsh.so ~/.loacl/lib/libgmsh.so

   Replacing the second path the real path to the libgmsh.so complained about before.

4. Now carry on with the install of SPiRA

   pip install .

   This will install the necessary remaining requirements and SPiRA itself.

5. Now execute python and type the following:

   import spira
   import gmsh

   If all went well you should be greeted with the SPiRA welcoming banner and no issues.

Usage

For examples, please refer to the Documentation

All examples can be ran from the environment directory, which is the home directory of your spira folder. For the basic tutorial samples:

python tutorials/basic/_9_stretch_1.py

For the more advanced example with their own defined Rule Deck Database, as explained here.

python spira/technologies/default/circuits/ytron_circuit.py

License

Distributed under the MIT License. See LICENSE for more information.

Contact

• Johannes Delport - [email protected]
• Kyle Jackman - [email protected]
• Coenrad Fourie - [email protected]

Acknowledgements

• Gdspy
• Phidl
• Clippers

History of changes

Version 0.2.2 (June 11, 2021)

• Implementation of the RoutePath function to route inductors between two ports along a specified path
• Code cleanup

Version 0.2.0 (October 4, 2019)

• Added layout netlist extraction and viewing.
• Added electrical rule checking (ERC).
• Added filters for advanced layout manipulation.
• Updated ports for more information descriptions. Terminals can now be separated from port definitions.
• A new concept, called virtual modeling (VModel) is introduced. This allows you to create multiple, virtual versions of a single layout for either debugging or fabrication purposes.
• Routing algorithms have been updated to leverage speed improvements made in the Gdspy library.
• The GDSII parser has been updated for better code structure and faster read/write operations.

Version 0.1.1 (July 16, 2019)

• Updated the advanced tutorial documentation.
• Added developers documentations.
• Updated the expand transform algorithms, which fixes a lot of known issues.
• Updated the GDSII input parser to use new transformation parameters.
• Changed the ref parameter to reference in SRef.

Version 0.1.0 (July 10, 2019)

• Added first version of documentation.
• Renamed Fields to Parameters to overcome confusion.
• Renamed elemental to elements, since spira.Cell does not inherit from gdspy.Cell anymore.
• Added parameter restrictions and preprocessing capabilities.
• Updated parameters to accept an extra restriction argument.
• Introduces Vector, Line, and Coord classes.
• Depricated locked ports. Instead different port purposes can now be defined.
• Introduces process and purpose parameters to layer elements.
• Introduces derived layers to allow for layer boolean operations. This makes the RDD more flexible for future technology changes.
• Updated the edge generation algorithms to include both an outside and inside edge.
• Updated the routing algorithms to use new gdspy features.
• Added stretching operations.
• Extended the RDD to include display resources.
• Fix issues with writing to a GDSII file.
• Added snap to grid functionality.
• Implemented parameters caching.
• Added port alignment operations.
• Added PortList class for special port filtering functionality.
• Created layer mappers.
• Changed the default coordinate system to improve port transformations.
• Updates shapes and polygons to only include single polygons. Multiple polygons are now moved to the PolygonGroup class.
• Updated ports to extend from the Vector.
• Added a custom LayerList class that compares already added layers.
• Updated mixins to a single MixinBowl meta-configuration.
• Updated the datatype parameter of ports that represents primitive connects.
• Added NumberParameter which supports 'int' and 'float' parameters.
• Added ComplexParameter which supports 'int', 'float' and 'complex' parameters.
• Added automatic docstring generation.

Version 0.0.3 (March 12, 2019)

• Added Dummy ports for crossing nodes in netlist.
• Automatically generate terminal edges for metal polygons.
• Added shape for yTron.
• Added path routing between two terminals.
• Define a route using a list of terminals.
• Device cell detection (Junction, Via, etc).
• Basic LVS implementation.

Version 0.0.2 (Jan 11, 2019)

• Implemented Manhattan routing between terminals.
• Integrated circleci.
• Started adding unit tests using pytest.
• Updated auto doc generation for classes.
• Added MidPointField for port and terminal midpoints.
• Introduces the Shape class that allows for complex point manipulations.
• Introduces term which is a vertical connection port.
• Routes are defined as a Shape with two connected terminal ports.

Version 0.0.1 (Dec 01, 2018)

• Initial release.