# YosysHQ/nextpnr

nextpnr portable FPGA place and route tool

Repository: https://github.com/YosysHQ/nextpnr
Canonical: https://ross.abutalabs.com/products/nextpnr
Language: C++
License: ISC
License Family: permissive
Last push: 2026-08-26T08:46:26+00:00

## Health v2 (maintenance only)
Score: 90/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 99, release rhythm 73, longevity 100
- inputs: {"age_days": 2954, "days_push": 7, "days_rel": 22, "gap_med": 158.5, "n_releases_24m": 5}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1735, forks 339 (observed 2026-08-28T04:05:29.098702+00:00)

## What it is
nextpnr is a vendor-neutral, timing-driven, open-source FPGA place and route tool written in C++. It supports multiple FPGA architectures including Lattice iCE40/ECP5/Nexus, Gowin, Cologne Chip GateMate, and experimental backends for Cyclone V, MachXO2, and Xilinx 7-series devices.

## Use cases
- implement an FPGA design from Yosys-synthesized netlist to bitstream
- run place and route for Lattice iCE40 or ECP5 FPGAs without vendor tools
- experiment with custom FPGA architectures via the generic backend
- do timing-driven P&R for Gowin or GateMate devices
- build a fully open-source FPGA toolchain with Yosys and nextpnr

## When to choose
- you want a FOSS FPGA flow avoiding vendor proprietary tools
- your target device is one of the supported architectures
- you need timing-driven placement and routing with a Python-scriptable API

## When to avoid
- your FPGA is from a vendor not yet supported (e.g. most Xilinx or Intel devices)
- you need vendor-verified bitstreams for production with strict timing guarantees
- you only need synthesis without place and route

## Facets
- artifact type: cli-tool
- maturity: active
- function: compiler, simulation, developer-tools
- domain: hardware, embedded-systems, developer-tools
- platform: windows, cli, cross-platform
- tags: fpga, place-and-route, eda, open-source-hardware, yosys, ice40, ecp5, timing-driven, linux, macos

## Member repositories
- YosysHQ/nextpnr (main) score 90

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:05:29.098702+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T03:30:46.741037+00:00, confidence not recorded.
  - readme: https://github.com/YosysHQ/nextpnr (fetched 2026-08-28T04:05:29.098702+00:00, sha 3c2b13214197)
- Data as of 2026-08-30T08:39:29.467469+00:00.