在RISC-V软核上运行Linux的FPGA开发板 - OrangeCrab
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在RISC-V软核上运行Linux的FPGA开发板 - OrangeCrab
The OrangeCrab is an electronics development board. It is FPGA based featuring an ECP5 from Lattice. The board follows the slim feather board specification from Adafruit. The FPGA is compatible with all open source toolchains and is perfect for experimenting with RISC-V cores. There aren't many FPGA boards available that make use of the ECP5, but here are some distinct features that set this board apart:
Small Compact size (Take it anywhere!)
Direct USB connection to the FPGA (Operate as a DFU, MSC, CDC, or composite device!)
On-board DDR3 Memory (1Gbit!)
Pre-loaded DFU bootloader (No external programmer required!)
It's Orange!
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硬件资源
Lattice ECP5-25F FPGA in csfBGA285 package (-8 speed grade) (Part # LFE5U-25F-8MG285C)
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)
64M x16
1.35V low voltage operation
Micro USB connection
Full-speed (12Mbit) USB with a direct connection to the 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 a charge indicator LED
LiPo battery connector (PH type)
48MHz onboard oscillator
Standard 0.05" JTAG connector
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").
如何使用
MicroPython + CircuitPython
This is still a work in progress!
Plug the board in and start blinking LEDs straight away with no external tools required.
RISCV firmware
Install the RISCV GCC compiler and start programming the board, code is executed on the SoC created by the bootloader.
FPGA gatware
Update the FPGA gateware using Verilog or other Higher level language: nMigen, Litex, Chisel, etc.
相关文章
使用KiCad画
开源的Bootloader
Which uses an an open source VexRiscv CPU
Which in turn implements the open source ISA: RISCV (rv32im)
Fully compatible with the open source FPGA toolchain and flow:
Yosys- Synthesis
Nextpnr - Place and route
Trellis- ECP5 documentation and utilities.
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硬禾发布2020-04-25
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