USB
===

The USB standard is available from [USB-IF](https://usb.org/).

* [USB 2.0 Specification](https://usb.org/document-library/usb-20-specification) - [direct link](https://www.usb.org/sites/default/files/usb_20_20190524.zip)
* [USB 3.2 Specification](https://usb.org/document-library/usb-32-specification-released-september-22-2017-and-ecns) - [direct link](https://www.usb.org/sites/default/files/usb_32_20200716_0.zip)
* [USB 4 Specification](https://usb.org/document-library/usb4tm-specification) - [direct link](https://usb.org/sites/default/files/USB4%20Specification_5.zip)

Manufacturers
-------------

### Realtek

* RTL8152/8153 - There is no programmings documentation available.  There are some datasheets that are labeled confidential, but they do not contain enough information to program the devices.