SEm-Labos/Libs/RiscV/NEORV32/setups/vivado/nexys-a7-test-setup/README.md

NEORV32 Test Setup for the Digilent Nexys A7 and Nexys 4 DDR FPGA Boards

This setup provides a very simple script-based "demo setup" that allows to check out the NEORV32 processor on the Digilent Nexys A7 and Nexys 4 DDR boards. It uses the simplified neorv32_test_setup_bootloader.vhd top entity, which is a wrapper for the actual processor top entity that provides a minimalistic interface (clock, reset, UART and 4 LEDs).

• FPGA Boards:
  • 📚 Digilent Nexys A7 FPGA Boards
  • 📚 Digilent Nexys 4 DDR FPGA Board
• FPGAs:
  • Xilinx Artix-7 XC7A50TCSG324-1
  • Xilinx Artix-7 XC7A100TCSG324-1
• Toolchain: Xilinx Vivado (tested with Vivado 2020.2)

NEORV32 Configuration

ℹ️ See the top entity rtl/test_setups/neorv32_test_setup_bootloader.vhd for configuration and entity details and nexys_a7_test_setup.xdc for the according FPGA pin mapping.

• CPU: rv32imcu_Zicsr + 4 HPM (hardware performance monitors)
• Memory: 16kB instruction memory (internal IMEM), 8kB data memory (internal DMEM), bootloader ROM
• Peripherals: GPIO, MTIME, UART0, WDT
• Tested with version 1.5.3.3
• Clock: 100MHz from on-board oscillator
• Reset: Via dedicated on-board "RESET" button
• GPIO output port gpio_o bits 0..7 are connected to the green on-board LEDs (LD0 - LD7); LD0 is the bootloader status LED
• UART0 signals uart0_txd_o and uart0_rxd_i are connected to the on-board USB-UART chip