OrangeCrab

OrangeCrab Web site

ECP5 FPGA Feather development board.

Latest Revision:

• OrangeCrab r0.2.1

Previous Revisions:

• OrangeCrab r0.2
• OrangeCrab r0.1

What is it?

There aren't many OSHW ECP5 boards available. Given that this FPGA is fully supported by an open source toolchain I decided to create one. In order to make use of the DDR3L support the ECP5 has, I've added some DDR3L memory. The board matches the feather format

Hardware Overview

• Lattice ECP5-25F or ECP5-85F FPGA in csfBGA285 package
  • 24 K - Look Up Tables
  • 1008 Kb - Embedded Block RAM
  • 194 Kb - Distributed RAM
  • 28 - 18x18 Multipliers
  • PLLs: 2
  • Internal oscillator
  • Flexible I/O for DDR3 Memory Support
• DDR3L Memory
  • 128 Mbytes (1Gbit) or 512Mbytes (4Gbit)
  • x16 data width to FPGA
  • 1.35V low voltage operation
• USB-C connection
  • Full-speed (12Mbit) USB with direct connection to FPGA
• Non-volatile Storage
  • 128Mbit QSPI FLASH Memory
    • Bootloader (First 4Mbits)
    • User Bitstream
    • User storage (Firmware/MSC backend/etc)
    • QSPI compatible
  • MicroSD socket
    • 4bit SD interface (CK, CMD, DAT0-3)
• Power supply
  • High efficiency DCDC for main supplies
  • Battery charger (100mA), with charge indicator LED
  • LiPo battery connector (PH type) (1-cell: 3.7-4.2V)
• 48MHz onboard oscillator
• Accessible 0.1" JTAG breakout
• User I/O
  • 1x Button
  • 1x RGB LED
  • 20x I/O on 0.1" headers
• Analog System
  • Analog Mux
  • SAR ADC, external RC / input comparator of FPGA
  • Digital bypass
  • Internal channels for supply monitor
  • Battery voltage sensing
• Feather Format Board
  • Dimensions: 22.86mm x 50.8mm (0.9" x 2.0")

  • Castellated I/O edges

Example code

Example code for Verilog, Litex, And RiscV can be found here:

• Orange Crab Examples

Community

We have an OrangeCrab group on the 1BitSquared Discord

• https://discord.gg/c4Dnr3b

Licence

• Hardware in this repository is licensed under CERN OHL v1.2

• Gateware/Software/Firmware in this repository is licensed under MIT unless otherwise indicated

  Open Source Hardware

  This board is an OSHWA approved design: AU000015