Open-hardware Lattice ECP5 board used for open-source FPGA development, education, LiteX and retro-computing projects.
LFE5U-85F-6BG381Copen toolchainprice unknowneducationvideoretrorisc-v
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Open-source educational Lattice iCE40UP5K board designed around the Yosys, nextpnr and IceStorm flow.
iCE40UP5K-SG48open toolchainprice unknowneducationcontroldspformal
| Field | ULX3S | iCEBreaker |
|---|---|---|
| Chip | LFE5U-85F-6BG381C | iCE40UP5K-SG48 |
| Family | ECP5 | iCE40 UltraPlus |
| Device type | FPGA | FPGA |
| Price | unknown | unknown |
| Toolchains | Yosys + nextpnr + Project Trellis | Yosys + nextpnr + IceStorm, Lattice Diamond Programmer |
| Open toolchain | yes | yes |
| Interfaces | Digital video connector, SD card, USB | microUSB FT2232H, FT2232H programming, USB serial |
| Memory | SDRAM varies by revision | QSPI flash 128 Mbit |
| Documentation | 72 | 82 |
| Difficulty | intermediate | beginner |
| Openness score | 95 | 96 |
| Where to get help | ULX3S project links | iCEBreaker community docs |
| Typical risks | Memory, USB and video details are revision-dependent; check the exact PCB revision. | Check add-on pinout and exact hardware revision before connecting Pmods. |
| Better for | open-source flow | open-source flow |