Nuclei FPGA Evaluation Kit¶
Nuclei have customized different FPGA evaluation boards (called Nuclei FPGA Evaluation Kit), which can be programmed with Nuclei Demo SoC FPGA bitstream.
Nuclei FPGA Evaluation Kit, 100T version
This 100T version is a very early version which widely used since 2019, it has a Xilinx XC7A100T FPGA chip on the board.
Nuclei FPGA Evaluation Kit, DDR 200T version
This DDR 200T version is a latest version which provided since 2020.09, it has a Xilinx XC7A200T FPGA chip on the board, and the onboard DDR could be connected to Nuclei RISC-V Core.
This board is a choice to replace the 100T version, and it could be use to evaluate any Nuclei RISC-V core.
We also use this version of board to evaluate Nuclei UX class core which can run Linux on it, it you want to run Linux on this board, please refer to Nuclei Linux SDK.
Nuclei FPGA Evaluation Kit, MCU 200T version
This MCU 200T version is a latest version which provided since 2020.09, it has a Xilinx XC7A200T FPGA chip on the board, but there is no DDR chip on the board.
This board is a choice to replace the 100T version, and it could be use to evaluate any Nuclei RISC-V core with don’t use DDR.
Click Nuclei FPGA Evaluation Kit Board Documents to access the documents of these boards.
Follow the guide in Nuclei FPGA Evaluation Kit Board Documents to setup the board, make sure the following items are set correctly:
Use Nuclei FPGA debugger to connect the MCU-JTAG on board to your PC in order to download and debug programs and monitor the UART message.
Power on the board using USB doggle(for 100T) or DC 12V Power(for MCU 200T or DDR 200T).
The Nuclei FPGA SoC FPGA bitstream with Nuclei RISC-V evaluation core inside is programmed to FPGA on this board.
Following steps in debugger kit manual to setup JTAG drivers for your development environment
How to use¶
For Nuclei FPGA Evaluation board:
DOWNLOAD support all the modes list in DOWNLOAD
You can find default used linker scripts for different download modes in
gcc_demosoc_ilm.ld: Linker script file for
gcc_demosoc_flash.ld: Linker script file for
gcc_demosoc_flashxip.ld: Linker script file for
gcc_demosoc_ddr.ld: Linker script file for
DOWNLOAD=ddr. Caution: This download mode can be only used when DDR is connect to Nuclei RISC-V Core
If you want to specify your own modified linker script, you can follow steps described in Change Link Script
If you want to change the base address or size of ILM, DLM, RAM, ROM or Flash of linker script file, you can adapt the Memory Section in the linker script file it according to your SoC memory information.
CORE support all the cores list in CORE
Its openocd configuration file can be found in
To run this application in Nuclei FPGA Evaluation board in Nuclei SDK, you just need to use this SOC and BOARD variables.
# Clean the application with DOWNLOAD=ilm CORE=n307 make SOC=demosoc BOARD=nuclei_fpga_eval DOWNLOAD=ilm CORE=n307 clean # Build the application with DOWNLOAD=ilm CORE=n307 make SOC=demosoc BOARD=nuclei_fpga_eval DOWNLOAD=ilm CORE=n307 all # Upload the application using openocd and gdb with DOWNLOAD=ilm CORE=n307 make SOC=demosoc BOARD=nuclei_fpga_eval DOWNLOAD=ilm CORE=n307 upload # Debug the application using openocd and gdb with DOWNLOAD=ilm CORE=n307 make SOC=demosoc BOARD=nuclei_fpga_eval DOWNLOAD=ilm CORE=n307 debug
You can change the value passed to CORE according to the Nuclei Demo SoC Evaluation Core the Nuclei FPGA SoC you have.
You can also change the value passed to DOWNLOAD to run program in different modes.
The FreeRTOS and UCOSII demos maybe not working in
flashxipdownload mode in Nuclei FPGA board due to program running in Flash is really too slow. If you want to try these demos, please use