NEXTPNR-ICE40(1)

📦
version 0.10 · 9 versions
, in ubuntu stonking

💖 NEXTPNR-ICE40(1) 💖

okay bestie, sit down, hydrate, because we're talking about nextpnr-ice40 — Next Generation Place and Route, Version 0.10-5. this is the nextpnr-ice40(1) page and it's serving 💅

✨ NAME ✨

nextpnr-ice40 — Next Generation Place and Route 🦋

🌸 DESCRIPTION 🌸

so <rainbow>"nextpnr-ice40"</rainbow> is Next Generation Place and Route (Version 0.10-5), periodt. it takes your design and figures out where everything physically lives on the chip and how all the wires get there. it's giving main character energy for your FPGA flow, fr fr. 💖

👑 General options:

  • -h [--help] — show help. if ur lost, start here bestie 🙈
  • -v [--verbose] — verbose output. spill everything, no holding back 💬
  • -q [--quiet] — quiet mode, only errors and warnings displayed. no yapping, just the important stuff 🤫
  • --Werror — Turn warnings into errors. warnings just got promoted, good for them 💀
  • -l [--log] arg — log file, all log messages are written to this file regardless of -q. yes even when ur in quiet mode, the receipts are being kept 📝
  • --debug — debug output 🐛
  • --debug-placer — debug output from placer only 🧩
  • --debug-router — debug output from router only 🛣️
  • --threads arg — number of threads for passes where this is configurable. parallelize and slay 🧵
  • -f [--force] — keep running after errors. stubborn queen behavior 👑
  • --run arg — python file to execute instead of default flow 🐍
  • --pre-pack arg — python file to run before packing 📦
  • --pre-place arg — python file to run before placement 🧷
  • --pre-route arg — python file to run before routing 🚦
  • --post-route arg — python file to run after routing 🎀
  • --on-failure arg — python file to run in event of crash for design introspection. it's the autopsy script, bestie 😭
  • --json arg — JSON design file to ingest 🥗
  • --write arg — JSON design file to write 💾
  • --top arg — name of top module ⭐
  • --seed arg — seed value for random number generator 🎲
  • -r [--randomize-seed] — randomize seed value for random number generator 🎰
  • --placer arg — placer algorithm to use; available: sa, heap, static; default: heap 🧠
  • --router arg — router algorithm to use; available: router1, router2; default: router1 🛰️
  • --slack_redist_iter arg — number of iterations between slack redistribution ⏳
  • --cstrweight arg — placer weighting for relative constraint satisfaction ⚖️
  • --starttemp arg — placer SA start temperature 🌡️
  • --pack-only — pack design only without placement or routing. pack it up and go 📦✨
  • --no-route — process design without routing 🚫
  • --no-place — process design without placement 🚫
  • --no-pack — process design without packing 🚫
  • --ignore-loops — ignore combinational loops in timing analysis 🔁
  • --ignore-rel-clk — ignore clock-to-clock relations in timing checks 🕐
  • -V [--version] — show version. drop the number 💅
  • --test — check architecture database integrity 🔍
  • --freq arg — set target frequency for design in MHz 📶
  • --timing-allow-fail — allow timing to fail in design. sometimes we let it cook 🍳
  • --no-tmdriv — disable timing-driven placement 🚫⏱️
  • --sdc arg — Generic timing constraints SDC file to load 📂
  • --sdf arg — SDF delay back-annotation file to write 📝
  • --sdf-cvc — enable tweaks for SDF file compatibility with the CVC simulator 🧪
  • --no-print-critical-path-source — disable printing of the line numbers associated with each net in the critical path 🚫🔢
  • --placer-heap-alpha arg — placer heap alpha value (float, default: 0.1) 🅰️
  • --placer-heap-beta arg — placer heap maximum placement density (float, default: 0.9) 🅱️
  • --placer-heap-critexp arg — placer heap criticality exponent (int, default: 2) 📈
  • --placer-heap-timingweight arg — placer heap timing weight (int, default: 10) ⚖️
  • --placer-heap-cell-placement-timeout arg — allow placer to attempt up to max(10000, total cells^2 / N) iterations to place a cell (int N, default: 8, 0 for no timeout) ⏱️
  • --static-dump-density — write density csv files during placer-static flow 📊
  • --parallel-refine — use new experimental parallelised engine for placement refinement 🧪✨
  • --router2-heatmap arg — prefix for router2 resource congestion heatmaps 🔥🗺️
  • --tmg-ripup — enable experimental timing-driven ripup in router 🧪✂️
  • --router2-tmg-ripup — enable experimental timing-driven ripup in router (deprecated; use --tmg-ripup instead) ⚠️
  • --router2-alt-weights — use alternate router2 weights 🔀
  • --report arg — write timing and utilization report in JSON format to file 📄
  • --detailed-timing-report — Append detailed net timing data to the JSON report 🧾
  • --placed-svg arg — write render of placement to SVG file 🎨
  • --routed-svg arg — write render of routing to SVG file 🎨

🌈 Architecture specific options:

  • --package arg — set device package 📦
  • --pcf arg — PCF constraints file to ingest 🥗
  • --asc arg — asc bitstream file to write 💾
  • --read arg — asc bitstream file to read 📖
  • --promote-logic — enable promotion of 'logic' globals (in addition to clk/ce/sr by default) ⬆️
  • --no-promote-globals — disable all global promotion 🚫🌐
  • --opt-timing — run post-placement timing optimisation pass (experimental) 🧪⏱️
  • --tmfuzz — run path delay estimate fuzzer 🎯
  • --pcf-allow-unconstrained — don't require PCF to constrain all IO 🕊️
heads up bestie: --router2-tmg-ripup is deprecated, so use --tmg-ripup instead, okay? don't come for me later 🙈

that's the whole vibe check, and it ate 💅✨

this was nextpnr-ice40 version 0.10-5, from March 2026 🎀 — mwah, go place and route something iconic. bye bestie!! 💖🦋🌸

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