---
name: "arachne-pnr"
section: "1"
platform: "linux"
package: "arachne-pnr"
version: "0.1+20190728gitc40fb22-3"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/arachne-pnr"
---

# arachne-pnr(1)

Place and route tool for iCE40 family FGPAs

## NAME

**arachne-pnr** - Place and route tool for iCE40 family FGPAs

## SYNOPSIS

```
arachne-pnr [options] <filename>
```

## DESCRIPTION

**Arachne-pnr implements the place and route step of the hardware compilation** **process for FPGAs. It accepts as input a technology-mapped netlist in BLIF** **format, as output by the Yosys synthesis suite for example. It currently** **targets the Lattice Semiconductor iCE40 family of FPGAs. Its output is a** **textual bitstream representation for assembly by the IceStorm icepack command.** **The output of icepack is a binary bitstream which can be uploaded to a hardware** **device.**

## OPTIONS

- **-h, --help**

  **Print this usage message.**

- **-q, --quiet**

  **Run quiet.  Don't output progress messages.**

- **-d \<device\>, --device \<device\>**

  **Target device \<device\>.  Supported devices:** **1k - Lattice Semiconductor iCE40LP/HX1K** **8k - Lattice Semiconductor iCE40LP/HX8K** **Default: 1k**

- **-c \<file\>, --chipdb \<chipdb-file\>**

  **Read chip database from \<chipdb-file\>.** **Default: /usr/share/arachne-pnr/chipdb-\<device\>.bin**

- **--write-binary-chipdb \<file\>**

  **Write binary chipdb to \<file\>.**

- **-l, --no-promote-globals**

  **Don't promote nets to globals.**

- **-B \<file\>, --post-pack-blif \<file\>**

  **Write post-pack netlist to \<file\> as BLIF.**

- **-V \<file\>, --post-pack-verilog \<file\>**

  **Write post-pack netlist to \<file\> as Verilog.**

- **--post-place-blif \<file\>**

  **Write post-place netlist to \<file\> as BLIF.**

- **--route-only**

  **Input must include placement.**

- **-p \<pcf-file\>, --pcf-file \<pcf-file\>**

  **Read physical constraints from \<pcf-file\>.**

- **-P \<package\>, --package \<package\>**

  **Target package \<package\>.** **Default: tq144 for 1k, ct256 for 8k**

- **-r**

  **Randomize seed.**

- **-m \<int\>, --max-passes \<int\>**

  **Maximum number of routing passes.** **Default: 200**

- **-s \<int\>, --seed \<int\>**

  **Set seed for random generator to \<int\>.** **Default: 1**

- **-w \<pcf-file\>, --write-pcf \<pcf-file\>**

  **Write pin assignments to \<pcf-file\> after placement.**

- **-o \<output-file\>, --output-file \<output-file\>**

  **Write output to \<output-file\>.**

## AUTHOR

**This manual page was written by Ruben Undheim \<ruben.undheim@gmail.com\> for the Debian project (and may be used by others).**