NEXTPNR-ICE40

NAME

nextpnr-ice40 - Next Generation Place and Route

DESCRIPTION

nextpnr-ice40 -- Next Generation Place and Route (Version 0.4-1+b1)

General options:

-h [ --help ]

show help

-v [ --verbose ]

verbose output

-q [ --quiet ]

quiet mode, only errors and warnings displayed

-l [ --log ] arg

log file, all log messages are written to this file regardless of -q

--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

-f [ --force ]

keep running after errors

--gui

start gui

--gui-no-aa

disable anti aliasing (use together with --gui option)

--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

--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; 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

--placer-budgets

use budget rather than criticality in placer timing weights

--pack-only

pack design only without placement or routing

--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

-V [ --version ]

show version

--test

check architecture database integrity

--freq arg

set target frequency for design in MHz

--timing-allow-fail

allow timing to fail in design

--no-tmdriv

disable timing-driven placement

--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 beta value (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)

--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)

--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:

--lp384

set device type to iCE40LP384

--lp1k

set device type to iCE40LP1K

--lp4k

set device type to iCE40LP4K

--lp8k

set device type to iCE40LP8K

--hx1k

set device type to iCE40HX1K

--hx4k

set device type to iCE40HX4K

--hx8k

set device type to iCE40HX8K

--up3k

set device type to iCE40UP3K

--up5k

set device type to iCE40UP5K

	--u1k		set device type to iCE5LP1K
	--u2k		set device type to iCE5LP2K
	--u4k		set device type to iCE5LP4K

--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