49.USB - John Kneen: Microcontrollers
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USB 3.0 - Wikipedia
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USB (Communications) - Wikipedia
USB Protocol - PiEmbSysTech
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Universal Serial Bus - OSDev Wiki
About the USB Protocol, Common USB Bus Errors, and How to Troubleshoot Them - Total Phase Blog
USB2.0 Protocol Decode Software | Prodigy Technovations
A brief introduction to the USB protocol - AVR
File:Wireless USB protocol stack.png - Wikimedia Commons
USB keyboard mouse protocols system timing auxiliary device signal definitions
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USB Protocol: Types of USB Packets and USB Transfers (Part 2/6)
