THIS PROJECT IS INCOMPLETE!!! DON'T EXPECT ANYTHING HERE TO ACTUALLY WORK.

I made it public so that others can have a look at it.

Contents and current status:

• SpinalHDL ULPI seems to be working ok.
• In ./tb/cocotb, I try to build my first cocotb testbench. It's incomplete...
• The current design can receive USB packets as a device. I think it can also reply some hardcoded return packets. It's not at the point at all where a device can be enumerated.
• Further down this file, there's a pretty extensive list with open source USB resources and code.

References

• ULPI Specification 1.1
• Microchip/SMSC AN 19.17 - ULPI Design Guide
• Making USB Accessible @ Teardown 2019
• Raspberry Pico DAtasheet - USB Description

USB code for FPGAs

• ULPI Port

  • UTMI/ULPI bridge in VHDL
  • GPL2
  • Limited in functionality:
    • Doesn't handle register write abort
    • No register read
    • No support for suspend

• usb-serial - USB data transfer in VHDL

  • USB device controller in VHDL

  • Only supports serial class

  • UTMI interface

  • GPL2

  • Relatively well documented.

  • VNA project uses usb-serial and ulpi_port.

• USBCore

  Device controller.

  Has 2 main branches:

  • the default one is 'old', which is a VHDL controller. Not updated in 6 years.
  • the 'master' branch has last been updated 6 months ago. Written in Verilog.

• ULPI PMOD

  • USB3300 ULPI PHY
  • Uses 2 PMOD connectors, as expected.
  • 2 layer PCB. Gerbers are included.
  • Old version of KiCAD or incomplete library. Symbols in Schematc are not resolved... PCB loads fine.

• lambdaUSB

  USB 2.0 device controller written in nMigen.

  • "experimental stage and therefore incomplete."
  • Has a GUI to create a configuration.

• usb1_device

  • USB 1.1 Device IP Core by ASICSs World Services
  • No CPU required
  • relies on usb_phy block (~poor man's UTMI block) whichi can be found on opencores.org.
  • "modified BSD for Resume style license"

• usb2_dev

  • USB 2.0 Device IP Core by ASICSs World Services
  • UTMI interface
  • Core documentation is a very good USB introduction too.

• Nitro USB Core

  • USB 1.1 device using FPGA IOs
  • HW: CERN Open Hardware License v2
  • FW: LGPL 3.0

• Ultra Embedded USB 1.1 Host Controller

  • UTMI interface
  • AXI4-lite interface
  • Not compatible with OHCI/EHCI.
  • Has Linux driver
  • GPL 3.0

• Ultra Embedded ULPI Link Wrapper

  • UTMI to ULPI converter
  • No external register interface
  • SystemC testbench (but not tests?)
  • GPL 3.0

• ULPI in OpenVizsla

• Digilent Genesys2 - USB Device Demo

  This board has a TUSB1210.

• Luna

  Migen-based USB2 and USB3 core.