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nextpnr aims to be a vendor neutral, timing driven, FOSS FPGA place and routetool.

Currently nextpnr supports:

• Lattice iCE40 devices supported byProject IceStorm
• Lattice ECP5 devices supported byProject Trellis
• (experimental) a "generic" back-end for user-defined architectures

There is some work in progress towardssupport for Xilinx devices but it is not upstream and not intended for end users at the present time. We hope to see more FPGA families supported in the future. We would love your help in developing this awesome new project!

A brief (academic) paper describing the Yosys+nextpnr flow can be foundonarXiv.

Here is a screenshot of nextpnr for iCE40. Build instructions andgetting started notes can be found below.

See also:

• F.A.Q.
• Architecture API

The following packages need to be installed for building nextpnr, independentof the selected architecture:

• CMake 3.3 or later
• Modern C++11 compiler (clang-format required for development)
• Qt5 or later (qt5-default for Ubuntu 16.04)
• Python 3.5 or later, including development libraries (python3-dev for Ubuntu)
  • on Windows make sure to install same version as supported byvcpkg
• Boost libraries (libboost-dev libboost-filesystem-dev libboost-thread-dev libboost-program-options-dev libboost-python-dev libboost-iostreams-dev libboost-dev orlibboost-all-dev for Ubuntu)
• Eigen3 (libeigen3-dev for Ubuntu) is required to build the analytic placer
• Latest git Yosys is required to synthesise the demo design
• For building on Windows with MSVC, usage of vcpkg is advised for dependency installation.
  • For 32 bit builds:vcpkg install boost-filesystem boost-program-options boost-thread boost-python qt5-base eigen3
  • For 64 bit builds:vcpkg install boost-filesystem:x64-windows boost-program-options:x64-windows boost-thread:x64-windows boost-python:x64-windows qt5-base:x64-windows eigen3:x64-windows
  • For static builds, add-static to each of the package names. For example, changeeigen3:x64-windows toeigen3:x64-windows-static
  • A copy of Python that matches the version in vcpkg (currently Python 3.6.4). You can download theEmbeddable Zip File and extract it. You may need to extractpython36.zip within the embeddable zip file to a new directory called "Lib".
• For building on macOS, brew utility is needed.

  • Install all needed packagesbrew install cmake python boost boost-python3 qt5 eigen

  • Do not forget to add qt5 in path as wellecho 'export PATH="/usr/local/opt/qt/bin:$PATH"' >> ~/.bash_profile

    NOTE: this change is effective in next terminal session, so please re-open terminal window before next step

To build the iCE40 version of nextpnr, installicestorm with chipdbs installed in/usr/local/share/icebox,or another location, which should be passed as-DICEBOX_ROOT=/path/to/share/icebox (ensure to point it toshare/icebox and not where theicebox binaries are installed) to CMake.Then build and installnextpnr-ice40 using the following commands:

cmake -DARCH=ice40 .make -j$(nproc)sudo make install

On Windows, you may specify paths explicitly:

cmake -DARCH=ice40 -DICEBOX_ROOT=C:/ProgramData/icestorm/share/icebox -DCMAKE_TOOLCHAIN_FILE=C:/vcpkg/scripts/buildsystems/vcpkg.cmake -DVCPKG_TARGET_TRIPLET=x64-windows -G "Visual Studio 15 2017 Win64" -DPYTHON_EXECUTABLE=C:/Python364/python.exe -DPYTHON_LIBRARY=C:/vcpkg/packages/python3_x64-windows/lib/python36.lib -DPYTHON_INCLUDE_DIR=C:/vcpkg/packages/python3_x64-windows/include/python3.6cmake --build . --config Release

To build a static release, change the target triplet fromx64-windows tox64-windows-static and add-DBUILD_STATIC=ON.

A simple example that runs on the iCEstick dev board can be found inice40/examples/blinky/blinky.*.Usage example:

cd ice40/examples/blinkyyosys -p 'synth_ice40 -top blinky -json blinky.json' blinky.v               # synthesize into blinky.jsonnextpnr-ice40 --hx1k --json blinky.json --pcf blinky.pcf --asc blinky.asc   # run place and routeicepack blinky.asc blinky.bin                                               # generate binary bitstream fileiceprog blinky.bin                                                          # upload design to iCEstick

Running nextpnr in GUI mode:

nextpnr-ice40 --json blinky.json --pcf blinky.pcf --asc blinky.asc --gui

(Use the toolbar buttons or the Python command console to perform actionssuch as pack, place, route, and write output files.)

For ECP5 support, you must downloadProject Trellis,then follow its instructions to download the latest database and buildlibtrellis.

cmake -DARCH=ecp5 -DTRELLIS_INSTALL_PREFIX=/path/to/prjtrellis .make -j$(nproc)sudo make install

• Examples of the ECP5 flow for a range of boards can be found in theProject Trellis Examples.

The generic target allows running placement and routing for arbitrary custom architectures.

cmake -DARCH=generic .make -j$(nproc)sudo make install

An example of how to use the generic flow is ingeneric/examples. See also theGeneric Architecture docs.

Use cmake-D options to specify which version of nextpnr you want to build.

Use-DARCH=... to set the architecture. It is a semicolon separated list.Usecmake . -DARCH=all to build all supported architectures.

The following runs a debug build of the iCE40 architecture without GUI,without Python support, without the HeAP analytic placer and only HX1K support:

cmake -DARCH=ice40 -DCMAKE_BUILD_TYPE=Debug -DBUILD_PYTHON=OFF -DBUILD_GUI=OFF -DBUILD_HEAP=OFF -DICE40_HX1K_ONLY=1 .make -j$(nproc)

To make static build relase for iCE40 architecture use the following:

cmake -DARCH=ice40 -DBUILD_PYTHON=OFF -DBUILD_GUI=OFF -DSTATIC_BUILD=ON .make -j$(nproc)

The HeAP placer's solver can optionally use OpenMP for a speedup on very large designs. Enable this by passing-DUSE_OPENMP=yes to cmake (compiler support may vary).

You can change the location where nextpnr will be installed (this will usually default to/usr/local) by using-DCMAKE_INSTALL_PREFIX=/install/prefix.

It is possible to pre-generate.bba files. This can come in handy when building on time-constrained cloudinstances, or in situations where python is unable to use modules. To do this, specify the path to pre-generated.bba files by passing-DPREGENERATED_BBA_PATH= to cmake.

• All code is formatted usingclang-format according to the style rules in.clang-format (LLVM based withincreased indent widths and brace wraps after classes).
• To automatically format all source code, runmake clangformat.
• See the wiki for additional documentation on the architecture API.

• To save a movie recording of place-and-route click recording icon in toolbar and select empty directorywhere recording files will be stored and select frames to skip.
• Manualy start all PnR operations you wish
• Click on recording icon again to stop recording
• Go to directory containing files and exeecuteffmpeg -f image2 -r 1 -i movie_%05d.png -c:v libx264 nextpnr.mp4

• To build test binaries as well, use-DBUILD_TESTS=ON and aftermake runmake test to run them, or you can run separate binaries.
• To use code sanitizers use thecmake options:
  • -DSANITIZE_ADDRESS=ON
  • -DSANITIZE_MEMORY=ON -DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++
  • -DSANITIZE_THREAD=ON
  • -DSANITIZE_UNDEFINED=ON
• Running valgrind examplevalgrind --leak-check=yes --tool=memcheck ./nextpnr-ice40 --json ice40/blinky.json
• Running tests with code coverage use-DBUILD_TESTS=ON -DCOVERAGE and aftermake runmake ice40-coverage
• After that openice40-coverage/index.html in your browser to view the coverage report
• Note thatlcov is needed in order to generate reports

• Yosys
• Icarus Verilog
• ABC

• Project IceStorm (Lattice iCE40)
• Project Trellis (Lattice ECP5)
• Project X-Ray (Xilinx 7-Series)
• Project Chibi (Intel MAX-V)

• Arachne PNR
• VPR/VTR
• SymbiFlow
• Gaffe
• KinglerPAR