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