Linux Code Review Hub

Apr 10, 2024 · Fundamentals

Decoding the Mysterious Language of USB 2.0 Packets: A Deep Dive

This article breaks down the USB 2.0 communication protocol by explaining how raw serial bits are organized into fields and packets—covering SYNC, PID, address, endpoint, frame number, data, CRC, as well as token, SOF, data, split‑transaction and handshake packets, with concrete examples and timing details.