Package: pymtl3-net
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=======================================PyOCN (PyMTL3-net) is a parameterizable and powerful OCN (on-chip network) generator to generate synthesizable Verilog for different OCNs based on user-specified configurations (e.g., network size, topology, number of virtual channels, routing strategy, switching arbitration, etc.). It comes with PyMTL implementation and is the first one to provide functional-level (FL), cycle-level (CL), and register-transfer-level (RTL) modeling for building OCNs. Furthermore, PyOCN is open-source with a modular design and standardized interfaces between modules. The configurability and extensibility are maximized by its parametrization system to fit in various research and industrial needs.PyOCN supports OCN characterization by providing scripts (https://github.com/cornell-brg/mflowgen) that semi-automatically takes the generated Verilog and net activity file to drive a standard-cell-based electronic-design- automation (EDA) toolflow for area, energy, and timing analysis.DemoWe have a demo at repl.it (https://repl.it/@ChengTan/pyocn-demo), which shows the key features of PyOCN.Related publicationsCheng Tan, Yanghui Ou, Shunning Jiang, Peitian Pan, Christopher Torng, Shady Agwa, and Christopher Batten."PyOCN: A Unified Framework for Modeling, Testing, and Evaluating On-Chip Networks."37th IEEE International Conference on Computer Design. (ICCD-37), Nov 2019.Shunning Jiang, Christopher Torng, and Christopher Batten."An Open-Source Python-Based Hardware Generation, Simulation, and Verification Framework."First Workshop on Open-Source EDA Technology (WOSET'18) held in conjunction with ICCAD-37, Nov. 2018.Shunning Jiang, Berkin Ilbeyi, and Christopher Batten."Mamba: Closing the Performance Gap in Productive Hardware Development Frameworks."55th ACM/IEEE Design Automation Conf. (DAC-55), June 2018.LicensePyOCN is offered under the terms of the Open Source Initiative BSD
3-Clause License. More information about this license can be found here:http://choosealicense.com/licenses/bsd-3-clausehttp://opensource.org/licenses/BSD-3-ClauseInstallationPyOCN requires Python3.7 and has the following additional prerequisites:graphviz, verilatorgit, Python headers, and libffivirtualenvPyMTL3The steps for installing these prerequisites and PyOCN on a fresh Ubuntu
distribution are shown below. They have been tested with Ubuntu Trusty
14.04.Install python3% sudo apt-get install python3.7Install graphviz% sudo apt-get install -y graphvizInstall VerilatorVerilatoris an open-source toolchain for compiling Verilog RTL
models into C++ simulators. PyOCN uses Verilator for Verilog import.% wget https://github.com/cornell-brg/verilator-travisci-cache/raw/master/verilator-travis-4.008.tar.gz
 % tar -C ${HOME} -xzf verilator-travis-4.008.tar.gz
 % export VERILATOR_ROOT=${HOME}/verilator
 % export PATH=${VERILATOR_ROOT}/bin:${PATH}
 % export PYMTL_VERILATOR_INCLUDE_DIR=${VERILATOR_ROOT}/share/verilator/include
 % verilator --versionInstall git, Python headers, and libffiWe need to install the Python headers and libffi in order to be able to
install the cffi Python package. cffi provides an elegant way to call C
functions from Python, and PyMTL uses cffi to call C code generated by
Verilator. We will use git to grab the PyMTL source. The following
commands will install the appropriate packages:% sudo apt-get install git python-dev libffi-devCreate virtual environmentWhile not strictly necessary, we strongly recommend usingvirtualenvto install PyMTL3 and the Python packages that PyMTL3 depends on.
virtualenv enables creating isolated Python environments. The following
commands will create and activate the virtual environment:% python3 -m venv ${HOME}/venv
 % source ${HOME}/venv/bin/activateInstall PyMTL3 and Python requirements% pip install pymtl3
 % pip install --upgrade pip setuptools twine
 % pip install --requirement requirements.txt
 % pip listClone PyOCN repoWe can now use git to clone the PyOCN repo.% mkdir -p ${HOME}/cornell-brg
 % cd ${HOME}/cornell-brg
 % git clone --depth=50 https://github.com/cornell-brg/posh-ocn.git cornell-brg/posh-ocnWhen you're done testing/developing, you can deactivate the virtualenv::% deactivate