USB Technology

7.

USB Communication Protocol

7.1.

The Enumeration Process

7.1.1.

Device Detection by Host

7.1.2.

Reset Signaling

7.1.3.

Assignment of Device Address

7.1.4.

Reading Device Descriptors

7.1.5.

Device Configuration

7.1.6.

Driver Loading and Initialization

7.2.

USB Descriptors

7.2.1.

Device Descriptor

7.2.1.1.

Vendor and Product IDs

7.2.1.2.

Device Class Information

7.2.2.

Configuration Descriptor

7.2.2.1.

Power Requirements

7.2.2.2.

Interface Count

7.2.3.

Interface Descriptor

7.2.3.1.

Interface Class and Subclass

7.2.3.2.

Protocol Information

7.2.4.

Endpoint Descriptor

7.2.4.1.

7.2.4.2.

Maximum Packet Size

7.2.4.3.

Polling Interval

7.2.5.

String Descriptor

7.2.5.1.

Manufacturer Strings

7.2.5.2.

Product Strings

7.2.5.3.

Serial Number Strings

7.3.

Endpoints and Pipes

7.3.1.

Unidirectional Data Pipes

7.3.2.

Endpoint 0 (Control Endpoint)

7.3.3.

7.3.4.

Interrupt Endpoints

7.3.5.

Isochronous Endpoints

7.3.6.

Endpoint Addressing Scheme

7.4.

Packet Structure and Types

7.4.1.

7.4.1.1.

7.4.1.2.

7.4.1.3.

7.4.2.

7.4.2.1.

7.4.2.2.

7.4.2.3.

7.4.2.4.

7.4.3.

Handshake Packets

7.4.3.1.

ACK (Acknowledge)

7.4.3.2.

NAK (Negative Acknowledge)

7.4.3.3.

STALL (Endpoint Halt)

7.4.3.4.

7.4.4.

Start-of-Frame Packets

7.4.4.1.

Frame Numbering

7.4.4.2.

Synchronization

7.4.4.3.

Microframe Support

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6. USB Type-C Alternate Modes

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8. Specialized USB Technologies