toolchain_guidebeginnerconfidence 4/5CC BY 4.0

What Yosys and nextpnr are

Yosys is an open-source synthesis tool; nextpnr is a portable place-and-route tool supporting several FPGA architectures through device databases.

Use Yosys/nextpnr when the target family is supported and the project can stay within supported primitives. For iCE40 and ECP5 this can be a strong first-class flow; for other families support may be partial or experimental.

Graph links

Boards: icebreaker/icebreaker, radiona/ulx3s, sipeed/tang-nano-20k

Chips: none

Toolchains: yosys, nextpnr, yosys-nextpnr-icestorm, yosys-nextpnr-trellis, yosys-nextpnr-apicula

Protocols: none

Pitfalls: Open-source support is family-specific, not universal across all FPGA vendors.

Commands

yosys -p 'read_verilog top.v; synth_ice40 -top top -json top.json'
nextpnr-ice40 --json top.json --pcf board.pcf --asc top.asc

Related boards

Tang Nano 20KSipeed

Compact Gowin GW2AR board with HDMI, audio amplifier, TF card slot, SDRAM, and onboard debugger.

Gowin Semiconductor GW2AR20,736 LUTopen toolchain28.17 USD

iCEBreakeriCEBreaker FPGA

Open-source educational Lattice iCE40UP5K board designed around the Yosys, nextpnr and IceStorm flow.

Lattice Semiconductor iCE40 UltraPlus5,280 LUTopen toolchainprice at the seller

ULX3SRadiona / EMARD

Open-hardware Lattice ECP5 board used for open-source FPGA development, education, LiteX and retro-computing projects.

Lattice Semiconductor ECP5open toolchainprice at the seller

Sources

yosyshq.com/open-source github.com/YosysHQ/nextpnr github.com/YosysHQ/apicula/wiki/openFPGALoader

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