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de0-nano-test-setup-avalonmm-wrapper

README.md

NEORV32 Test Setup using the NEORV32 with AvalonMM Master Interface wrapper

This setup provides a very simple "demo setup" that uses the NEORV32 with a AvalonMM Interface wrapper. This makes if possible to connect you own modules using a simple version of the AvalonMM Master interface.

Note that the AvalonMM Master is a very simple version providing only basic features:

  • Single read and write access
  • Flow control (variable wait-states)
  • 8/16/32 bit data access
  • Aligned and unaligned access supported

The AvalonMM Master does not support:

  • Burst access
  • Pipeline transfer
  • Pending reads

The design is based on the de0-nano-test-setup, but added a AvalonMM Master wrapper. The wrapper file can be found here AvalonMM wrapper.

As a test an "external" DMEM is conneced to the NEORV32 over the AvalonMM Master Interface.

It uses the simplified and simple example top entity that provides a minimalistic interface (clock, reset, UART and 8 LEDs).

  • FPGA Board: 📚 Terasic DE0-Nano FPGA Board
  • FPGA: Intel Cyclone-IV EP4CE22F17C6N
  • Toolchain: Intel Quartus Prime (tested with Quartus Prime 18.1.1 - Lite Edition)

NEORV32 Configuration

For NEORV32 configuration the default values of the neorv32_top in version 1.6.0 are used with a few exceptions:

  • Memory: 16kB instruction memory (internal IMEM), 8kB data memory (external DMEM), No bootloader
  • Tested with version 1.6.0
  • Clock: 50MHz from on-board oscillator
  • Reset: via on-board button "KEY0"
  • GPIO output port gpio_o (8-bit) connected to the 8 green user LEDs ("LED7" - "LED0")
  • UART0 signals uart0_txd_o and uart0_rxd_i are connected to the 40-pin GPIO_0 header
    • uart0_txd_o: output, connected to FPGA pin C3 - header pin GPIO_01 (pin number "4")
    • uart0_rxd_i: input, connected to FPGA pin A3 - header pin GPIO_03 (pin number "6")

FPGA Utilization

Total logic elements 3,439 / 22,320 ( 15 % )
Total registers      1674
Total pins           12 / 154 ( 8 % )
Total virtual pins   0
Total memory bits    197,632 / 608,256 ( 32 % )
Embedded Multiplier  9-bit elements	0 / 132 ( 0 % )
Total PLLs           0 / 4 ( 0 % )

How To Run

Open the Quartus project file, compile and upload to FPGA.