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