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nextpnr/machxo2
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Miodrag Milanovic 2c20ca917c clangformat 2025-07-28 12:11:07 +02:00
..
examples Update examples to synth_lattice 2023-08-30 16:27:17 +02:00
.gitignore machxo2: Update with Arch API changes 2021-02-12 10:36:59 +00:00
CMakeLists.txt CMake: Add include guards when IMPORT_BBA_FILES is used (#1438) 2025-01-23 10:54:37 +01:00
README.md cmake: Make HeAP placer always-enabled 2023-03-17 10:38:11 +01:00
arch.cc machxo2: less pessimistic delay prediction 2023-11-09 06:48:50 +01:00
arch.h clangformat 2023-10-28 17:10:42 +02:00
arch_place.cc use timing data 2023-10-02 14:49:17 +02:00
arch_pybindings.cc add write_bitstream to pybindings 2023-05-04 14:23:08 +02:00
arch_pybindings.h Fixing old emails and names in copyrights 2021-06-12 13:22:38 +01:00
archdefs.h clangformat 2024-09-30 14:51:33 +02:00
baseconfigs.cc clangformat 2023-05-04 14:23:08 +02:00
bitstream.cc clangformat 2025-07-28 12:11:07 +02:00
bitstream.h Fixing old emails and names in copyrights 2021-06-12 13:22:38 +01:00
cells.cc ramw and dram changes according to @gatecat 2023-05-04 14:23:08 +02:00
cells.h clangformat 2023-05-04 14:23:08 +02:00
config.cc add new field handling in chip config format 2023-03-16 13:37:23 +01:00
config.h add new field handling in chip config format 2023-03-16 13:37:23 +01:00
constids.inc Load timing data 2023-10-02 14:49:17 +02:00
facade_import.py properly assign latest fuzzed data 2023-10-02 14:49:17 +02:00
gfx.cc Use TRELLIS primitives 2023-03-20 09:53:35 +01:00
gfx.h Add simple BEL graphics 2023-03-16 13:37:23 +01:00
globals.cc clangformat 2024-09-30 14:51:33 +02:00
lpf.cc Added LPF support 2023-05-04 14:23:08 +02:00
machxo2_available.h.in Fix out of tree builds and place h in generated 2023-03-16 13:37:23 +01:00
main.cc CMake: refactor architecture-specific build system parts. 2025-01-21 17:13:03 +00:00
pack.cc clangformat 2024-09-30 14:51:33 +02:00

README.md

nextpnr-machxo2

Experimental FOSS Place And Route backend for the Lattice MachXO2 family of FPGAs. Fuzzing takes place as a subproject of prjtrellis.

Known to work:

  • Basic routing from pads to SLICEs and back!
  • Basic packing of one type of FF and LUT into half of a SLICE!
  • Using the internal oscillator OSCH as a clock
  • LOGIC SLICE mode

Things that probably work but are untested:

  • Any non-3.3V I/O standard that doesn't use bank VREFs.

Things remaining to do include (but not limited to):

  • More intelligent and efficient packing
  • Global Routing (exists in database/sim models, nextpnr-machxo2 doesn't use it yet)
  • Secondary High Fanout Nets
  • Edge Clocks (clock pads work, but not routed to global routing yet)
  • PLLs
  • Synchronous Release Global Set/Reset Interface (SGSR)
  • Embedded Function Block (EFB)
  • All DDR-related functionality
  • Bank VREFs
  • Embedded Block RAM (EBR)
  • CCU2 and DPRAM SLICE modes

Quick Start

The following commands are known to work on a near-fresh Linux Mint system (thank you securelyfitz!):

Prerequisites

sudo apt install cmake clang-format libboost-all-dev build-essential
qt5-default libeigen3-dev build-essential clang bison flex libreadline-dev
gawk tcl-dev libffi-dev git graphviz xdot pkg-config python3
libboost-system-dev libboost-python-dev libboost-filesystem-dev zlib1g-dev
python3-setuptools python3-serial

Installation

Use an empty directory to hold all the cloned repositories. Upstream repos can be used as well (e.g. YosysHQ/prjtrellis, etc.).

git clone git@github.com:cr1901/prjtrellis.git
cd prjtrellis
git checkout facade
git submodule update --init --recursive
cd libtrellis
cmake -DCMAKE_INSTALL_PREFIX=/usr
make -j 8
sudo make install

cd ../../

git clone git@github.com:cr1901/yosys.git
cd yosys/
git checkout machxo2
make config-gcc
make
sudo make install

cd ../

git clone git@github.com:tinyfpga/TinyFPGA-A-Programmer.git
cd TinyFPGA-A-Programmer/
sudo python setup.py install

cd ../

git clone git@github.com:cr1901/nextpnr.git
cd nextpnr
git checkout machxo2
git submodule update --init --recursive
cmake . -DARCH=machxo2 -DBUILD_GUI=OFF  -DTRELLIS_INSTALL_PREFIX=/usr -DBUILD_PYTHON=OFF 
make

Although uncommon, the facade and machxo2 branches of the above repos are occassionally rebased; use git pull -f if necessary.

Demo

If you have a TinyFPGA Ax2 board with the TinyFPGA Programmer, the following script will build a blinky bitstream and load it onto the MachXO2; the gateware will flash the LED!

cd machxo2/examples/
sh demo.sh tinyfpga

The tinyfpga.v code used in demo.sh is slightly modified from the user's guide to accommodate (* LOC = "pin" *) constraints and the built-in user LED.