update 835a405

.buildinfo

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+# Sphinx build info version 1
+# This file hashes the configuration used when building these files. When it is not found, a full rebuild will be done.
+config: 3a9ef3d141e453497a9073aadc74952b
+tags: 645f666f9bcd5a90fca523b33c5a78b7

_sources/community.rst.txt

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+.. _Community:
+
+Community
+#########
+
+`FOSS Flows For FPGA (F4PGA) <https://f4pga.org>`__ project is a `Workgroup <https://chipsalliance.org/workgroups/>`__
+under the `CHIPS Alliance <https://chipsalliance.com/>`__.
+The F4PGA Workgroup consists of members from different backgrounds, including FPGA vendors
+(`Xilinx <https://www.xilinx.com/>`__
+and `QuickLogic <https://www.quicklogic.com/>`__),
+industrial users
+(`Google <https://www.google.com/>`__
+and `Antmicro <https://antmicro.com/>`__)
+and academia
+(`University of Toronto <https://www.utoronto.ca/>`__),
+who collaborate to build a more open source and software-driven FPGA ecosystem (IP, tools and workflows) to drive the
+adoption of FPGAs in existing and new use cases, and eliminate barriers of entry.
+
+Communication
+=============
+
+* `Twitter [@f4pga] <https://twitter.com/f4pga>`__
+
+* `Slack [chipsalliance.slack.com] <https://chipsalliance.slack.com/>`__
+
+  .. TIP::
+    To register to CHIPS Alliance Slack workspace, use the following `Slack Invite <https://slack-invite.chipsalliance.org/>`__.
+
+* `IRC [irc.libera.chat/#F4PGA] <https://kiwiirc.com/nextclient/#irc://irc.libera.chat/#F4PGA>`__
+
+* `Mailing list [lists.chipsalliance.org/g/f4pga-wg] <https://lists.chipsalliance.org/g/f4pga-wg>`__
+
+Sources
+=======
+
+* :gh:`github.com/chipsalliance <chipsalliance/?q=f4pga>`
+
+* :gh:`github.com/F4PGA <F4PGA>`
+
+.. _Contributing:
+
+Contributing
+============
+
+Are you interested in helping this project move forward?
+F4PGA is a collaborative project and we welcome your contributions.
+The code is available on GitHub, while the HTML documentation is available on Read The Docs.
+There are multiple areas and technologies we need help with - reach out to us, we're sure we will find something for you.
+
+* Do you know **Python**?
+  Almost all scripts are written in Python!
+
+* Do you know **C++**?
+  VPR & nextpnr & libraries written in C++!
+
+* Do you know **TCL**?
+  All the EDA tools use TCL!
+
+* Do you know **(System) Verilog**, **VHDL**, **Chisel**, **Migen** and/or **Amaranth**?
+  Simulation and models are written in Hardware Description Languages (HDLs)!
+
+* Do you know **XML**?
+  Most file formats are XML!
+
+* Do you know English?
+  Documentation is written in English!
+
+* Do you know **Docker** and/or **Podman**?
+  Help make it easier to set up F4PGA!
+
+* Do you have time?
+  We will find you a task!

_sources/development/building-docs.rst.txt

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+Building the documentation
+##########################
+
+Activate the virtual environment and install dependencies::
+
+    make env
+    make enter
+
+Build the whole documentation::
+
+    make html
+
+For more options see::
+
+    make help

_sources/development/changes.rst.txt

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+Changes
+#######
+
+.. include:: changes.inc

_sources/development/venv.rst.txt

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+Packages in virtual environment
+###############################
+
+To install packages in conda environment you can use both
+``conda`` and ``pip``.
+
+Note that ``pip`` is installed in the conda environment which uses ``python3``,
+and is related to ``pip3`` **inside** the virtual environment,
+whereas invocation of ``pip3`` directly uses your **system** ``pip3`` instance,
+typically located in ``/usr/bin/pip3``

_sources/f4pga/Deprecated.rst.txt

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+.. _Understanding:
+
+Understanding the (deprecated) flow
+###################################
+
+.. IMPORTANT::
+  This section describes the usage of the now deprecated ``symbiflow_*`` entrypoints/wrappers.
+  It is provided for backwards compatibility, so that users of the *old* flow can keep using it.
+  However, it is recommended for new users to use the approach explained in :ref:`pyF4PGA`.
+
+This section provides valuable information on how each of the commands used to compile and build
+designs in F4PGA work. It is especially helpful for debugging or for using methods
+other than a makefile to build your designs, such as a bash or python script.
+
+The following describes the commands for running each of the steps for a full design flow
+(synthesis, place and route, and generate bitstream) as well as giving a description of the most
+common flags for those commands. If you would like a more detailed break down of how the design
+flow for F4PGA works take a look at the :ref:`Design Flows section <Flows>`.
+
+.. note::
+
+    Files created by synthesis, implementation, and bitstream generation will be dumped into
+    the directory from which the command is run by default. To keep all of the files generated by
+    the toolchain separate from your design files, you might consider running the toolchain
+    commands in a separate directory from your design files.
+
+
+
+Synthesis
+=========
+
+To synthesize your designs run the ``symbiflow_synth`` command. The command has the following
+flags:
+
+.. table:: symbiflow_synth
+
+    +------+---------------------------------------------------------------+
+    | Flag |                            Argument                           |
+    +======+===============================================================+
+    | -t   | Defines the name for the top level module                     |
+    +------+---------------------------------------------------------------+
+    | -v   | A list of paths to verilog files for the design               |
+    +------+---------------------------------------------------------------+
+    | -d   | FPGA family (i.e. artix7 or zynq7)                            |
+    +------+---------------------------------------------------------------+
+    | -p   | The part number for the FPGA (i.e xc7a35tcsg324-1)            |
+    +------+---------------------------------------------------------------+
+    | -x   | Optional command: path to xdc files for design                |
+    +------+---------------------------------------------------------------+
+
+
+An example of how to run synthesis on a design containing two separate
+verilog HDL files is below. The design is built for a basys3 board which comes from the artix7
+family and uses the xc7a35tcpg236-1 chip.
+
+.. code-block:: bash
+
+    symbiflow_synth -t top -v example.v top_example.v -d artix7 -p xc7a35tcpg236-1 -x design_constraint.xdc
+
+Synthesis is carried out using the Yosys open source tool. ``symbiflow_synth`` generates
+an .eblif file, a few verilog netlists that describe the gate level design for your project, and a log
+file. For more information on Yosys and its relation to F4PGA go to :ref:`Flows:F4PGA:Yosys`.
+
+.. note::
+    The build files generated by the toolchain (for example .eblif from synthesis, .net from
+    packing, .bit from generate bitstream) are named using the top module specified in
+    symbiflow_synth. For example if you specified ``switch_top`` as the top level module name
+    during synthesis using the ``-t`` flag, the build files generated by the toolchain would be
+    named switch_top.eblif, switch_top.net, etc.
+
+
+Place and Route
+===============
+
+The three steps for implementing a design are internally handled by the open source VPR
+(Versatile Place and Route) tool. For more information go to `VPR ➚ <https://docs.verilogtorouting.org/en/latest/vpr/>`__.
+
+Pack
+----
+
+Packing is run by the ``symbiflow_pack`` command and generates several files containing
+a pin usage report, a timing report, a log file, and a netlist. The various flags for the
+pack command are as follows:
+
+.. table:: symbiflow_pack
+
+    +------+--------------------------------------------------------------------+
+    | Flag |                              Argument                              |
+    +======+====================================================================+
+    | -e   | Path to .eblif file generated by synthesis                         |
+    +------+--------------------------------------------------------------------+
+    | -d   | Fabric definition for the board (i.e. xc7a100t_test)               |
+    +------+--------------------------------------------------------------------+
+    | -s   | Optional: SDC file path                                            |
+    +------+--------------------------------------------------------------------+
+
+Note that the -d option for this step (defining the fabric definition) is different
+from the -d from synthesis (defining the FPGA family).
+
+The following example runs packing on the basys3 board:
+
+.. code-block:: bash
+
+    symbiflow_pack -e top.eblif -d xc7a35t_test
+
+Place
+-----
+
+Placement generates several files describing the location of design elements
+as well as a log file. Placement is run using ``symbiflow_place`` which utilizes
+the following flags:
+
+.. table:: symbiflow_place
+
+    +------+----------------------------------------------------+
+    | Flag |                      Argument                      |
+    +======+====================================================+
+    | -e   | Path to .eblif file generated by synthesis         |
+    +------+----------------------------------------------------+
+    | -d   | Fabric definition (xc7a50t_test)                   |
+    +------+----------------------------------------------------+
+    | -p   | Optional: PCF file path                            |
+    +------+----------------------------------------------------+
+    | -n   | Path to the .net file generated by pack step       |
+    +------+----------------------------------------------------+
+    | -P   | The part number for the FPGA (i.e xc7a35tcsg324-1) |
+    +------+----------------------------------------------------+
+    | -s   | Optional: SDC file path                            |
+    +------+----------------------------------------------------+
+
+For the basys3:
+
+.. code-block:: bash
+
+    symbiflow_pack -e top.eblif -d xc7a35t_test -p design.pcf -n top.net -P xc7a35tcpg236-1 -s design.sdc
+
+
+Route
+-----
+
+Routing produces several timing reports as well as a post routing netlist and log file.
+``symbiflow_route`` uses the -e, -d, and the optional -s flags. The arguments for these flags
+are the same as in the placement step (.eblif, fabric definition, and SDC file path respectively).
+The following is an example:
+
+.. code-block:: bash
+
+    symbiflow_route -e top.eblif -d xc7a35t_test -s design.sdc
+
+
+Generating Bitstream
+====================
+
+Generating the bitstream consists of two steps. First, run ``symbiflow_write_fasm`` to generate
+the .fasm file used to create the bitstream. ``symbiflow_write_fasm`` uses the -e and -d flags
+with the same arguments as the placing and routing steps (.eblif path, and fabric definition).
+Second, run ``symbiflow_write_bitstream`` which has the following flags:
+
+.. table:: symbiflow_write_bitstream
+
+    +------+-------------------------------------------------------+
+    | Flag |                        Argument                       |
+    +======+=======================================================+
+    | -d   | FPGA family (i.e. artix7 or zynq7)                    |
+    +------+-------------------------------------------------------+
+    | -f   | The path to the .fasm file generated in by write_fasm |
+    +------+-------------------------------------------------------+
+    | -p   | The FPGA part number (i.e xc7a35tcsg324-1)            |
+    +------+-------------------------------------------------------+
+    | -b   | Name of the file to write the bitstream to            |
+    +------+-------------------------------------------------------+
+
+Notice that the specification for the part number is a lowercase ``-p`` instead of a capital
+``-P`` as in the placement step. Also note that the ``-d`` in write_bitstream defines the FPGA
+family instead of the fabric as in the write_fasm step.
+
+.. warning::
+
+   If you change the name of the output for your bitstream to something other than top.bit then the
+   openFPGALoader command used in the examples would need to change too. For example if I used
+   ``-b my_module_top`` in symbiflow_write_bitstream then my openFPGALoader command would change to:
+
+   .. code-block:: bash
+
+      openFPGALoader -b $OFL_BOARD my_module_top.bit
+
+   Note that the only part of the command that changes is "<top module name>.bit;"
+
+The following example generates a bitstream file named example.bit for the basys3 board:
+
+.. code-block:: bash
+
+    symbiflow_write_fasm -e top.eblif -d xc7a50t_test
+    symbiflow_write_bitstream -d artix7 -f top.fasm -p xc7a35tcpg236-1 -b example.bit