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The USB Basics Book for Designers-Part 2

When the USB device is plugged into the host, the host enumerates the configuration of the device through a series of actions (Configuration is a state belonging to the enumeration, the state indicates a temporary state), which are as follows.

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The USB Basics Book for Designers-Part 1

First, try to understand three basic concepts. 1. Endpoint: A data buffer located on the USB device or host, used to store and send a variety of data from the USB, each endpoint has a unique deterministic address, with different transmission characteristics (such as input endpoints, output endpoints, configuration endpoints, bulk transmission endpoints).

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Data Transfer Process of USB4 standard

This article will explain the data transfer process of USB4. USB4 only supports USB Type-C interface and no longer supports the traditional Type-A (Standard-A) interface and Type-B (Micro-B) interface, as these interfaces cannot support transfer speeds of 10+Gbps.

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USB4 Version 2.0 to be Released soon with 80Gbps Speed

On Sept 1, 2022, the USB Promoter Group announced the upcoming release of the USB4 version 2.0 specification, a major update to enable data performance of up to 80 Gbps over USB Type-C cables and connectors.

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The Effect of USB Cable Resistance on Voltage Drop

For cable, the voltage drop is the voltage difference between the two ends of the cable. For example, if 5V power supply is connected to the input of the cable, but only 4.8V is detected at the output end, so the voltage drop of the cable is 0.2V.

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Explanation of Type-C related terms

When discussing USB Type-C product details such as Type-C cable / Hub / Adapter / PD, you will often see some abbreviations for proper nouns, which are summarized here for use when learning.

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