board_guideintermediateconfidence 3/5CC BY 4.0

ULX3S: where to start

Start by identifying the ULX3S revision and ECP5 size, then use the documented open ECP5 flow and board-specific constraints.

ULX3S is powerful for an open-hardware board, but revision discipline matters. Record exact ECP5 size, memory option and PCB revision before trying LiteX, video or retro-computing projects.

Graph links

Boards: radiona/ulx3s

Chips: LFE5U-85F

Toolchains: yosys-nextpnr-trellis

Protocols: hdmi, sd-card, sdram

Pitfalls: ULX3S board revisions differ; do not reuse constraints blindly.

Related boards

Radiona / EMARDECP5intermediateconfidence 3/5

ULX3S

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

LFE5U-85F-6BG381Copen toolchainprice unknowneducationvideoretrorisc-v

Sources

https://ulx3s.github.io/https://radiona.org/ulx3s/

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