usbModel

The usbModel is a software model of both a USB host and device to standard USB 1.1, with hooks for USB 2.0 enhancements. Each model can be used independently, with the host model a generic implementation, and the device model an example of a specific communications device class (CDC) implementation. The models have been integrated with the VProc Virtual Processor to drive USB signals in a Verilog or VHDL simulation, with scripts for running on various open-source (Icarus, Verilator, NVC, GHDL) and commercial (Questa/ModelSim, Vivado) simulators. This allows the model to be used to drive device, hub, and host logic implementations.

<img src="https://github.com/wyvernSemi/usbModel/assets/21970031/41ae5119-1ca6-44ed-bc0c-f7b76ad2d5cc" width=800>

Host Model Features

• Automatic checks for connection/disconnection.
• Automatic generation of SOF token packets each frame.
• Ability to generate control transactions.
  • Get device, interface, endpoint, string, and class specific descriptors.
  • Set device address.
  • Get device, interface, and endpoint statuses.
  • Get and set device configuration (enable/disable).
  • Get and set interface alternative.
  • Set and clear device, interface, and endpoint features.
  • Get endpoint synch frame state.
• Generate bulk and isochronous OUT packets.
• Generate bulk and isochronous IN packets.
• Suspend a device.
• Reset a device.
• Display formatted output of received packet data.

Device Model Features

• Ability to connect and disconnect from USB line.
• Suspension detection.
• Reset detection.
• Implements a CDC device with:
  • One device configuration.
  • Two interfaces.
  • Three endpoints.
    • One a notify endpoint on one interface.
    • Two data endpoints (IN and OUT) on the other interface.
• Responses to control packets.
• Bulk data transfers IN and OUT.
  • A user callback can be registered at construction, called for each transfer request received.
• Display formatted output of received packet data.

<br> <img src="https://github.com/wyvernSemi/usbModel/assets/21970031/1cbb0edb-b50f-42c7-af89-3afb6791f045" width=453>