Compact open-source Lattice ECP5 board commonly used with LiteX, USB and open-source ECP5 flows.
LFE5U-25F/85Fopen toolchainprice unknownrisc-vlinuxusbeducation
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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 | OrangeCrab | ULX3S |
|---|---|---|
| Chip | LFE5U-25F/85F | LFE5U-85F-6BG381C |
| Family | ECP5 | ECP5 |
| Device type | FPGA | FPGA |
| Price | unknown | unknown |
| Toolchains | Yosys + nextpnr + Project Trellis | Yosys + nextpnr + Project Trellis |
| Open toolchain | yes | yes |
| Interfaces | USB, MicroSD | Digital video connector, SD card, USB |
| Memory | DDR3 requires revision check | SDRAM varies by revision |
| Documentation | 65 | 72 |
| Difficulty | intermediate | intermediate |
| Openness score | 92 | 95 |
| Where to get help | OrangeCrab GitHub organization | ULX3S project links |
| Typical risks | Feature set differs across OrangeCrab revisions; verify exact revision. | Memory, USB and video details are revision-dependent; check the exact PCB revision. |
| Better for | open-source flow | open-source flow |