USB 3.0 On-The-Go与嵌入式主机补充规范修订1.1

On-The-Go

需积分: 27 35 浏览量更新于2024-07-20 收藏 592KB PDF 举报

身份认证购VIP最低享 7 折!

30元优惠券

资源详情

资源推荐

On-The-Go and Embedded Host Supplement to the USB Revision 3.0 Specification Revision 1.1

1 Introduction

1.1 Overview

The Universal Serial Bus (USB), originally designed as an interface between PCs and peripherals, has

become the most successful general-purpose PC interface in the history of computing. The [USB3.0]

specification has added the capability for SuperSpeed communications over USB.

By definition, USB communication occurs between a host and a peripheral. The original intent was to

place the heavier workload on the PC (host) and to allow USB peripherals to be fairly simple.

Accordingly, the USB specification requires that PCs:

• provide power to peripherals (for [USB2.0] 0.5A at ~5V, for [USB3.0] 0.9A at ~5V)

• support all defined speeds (SuperSpeed, Low Speed, Full Speed and High Speed)

• support all defined data flow types (control, bulk, interrupt and isochronous)

As computing resources have become less expensive, the line between PCs and other products has

blurred. Today many devices that are not PCs in the classic sense have a need to connect directly to

peripherals: Printers connect directly with cameras, for example, or mobile phones may need to connect

to USB headsets.

These non-PCs have the computing resources to manage a USB host function, but they need to function

in ways that differ from standard PC hosts. Although they will provide host capability for some devices,

it's unreasonable to require them to support the full range of USB peripherals. For example, connecting a

camera to a printer makes a lot of sense, but the printer manufacturers may not think it is quite as

important for the printer to support a USB GPS dongle.

This specification defines these non-PC hosts as Targeted Hosts. A Targeted Host is a USB host that

supports a specific, targeted set of peripherals. The developer of each Targeted Host product defines

the set of supported peripherals on a Targeted Peripheral List (TPL). A Targeted Host needs to provide

only the power, bus speeds, data flow types, etc., that the peripherals on its TPL require.

There are two categories of Targeted Hosts:

1. Embedded Hosts: An Embedded Host (EH) product provides Targeted Host functionality over one

or more Standard-A or Micro-AB receptacles. Embedded Host products may also offer USB

peripheral capability, delivered separately via one or more Type-B receptacles.

2. On-The-Go: An OTG product is a portable device that uses a single Micro-AB receptacle (and no

other USB receptacles) to operate at times as a USB Targeted Host and at times as a USB

peripheral. OTG devices shall always operate as a standard peripheral when connected to a

standard USB host.

OTG devices can also be attached to each other. This specification enables the underlying driver

components to optionally swap between the role of either USB host or USB peripheral, without needing

to physically turn the cable around.

[OTG&EH2.0] applies to all Universal Serial Bus products. This supplement covers products which have

a SuperSpeed capability (as defined in the [USB3.0] specification) in addition to having capabilities

defined in [OTG&EH2.0]. The following additional configurations are covered by this supplement:

1. SuperSpeed Embedded Host or SS-EH: An Embedded Host which can operate at SuperSpeed

through its one or more Standard-A or Micro-AB receptacles in addition to EH capability defined in

[OTG&EH2.0]

for example support for SRP and ADP.

On-The-Go and Embedded Host Supplement to the USB Revision 3.0 Specification Revision 1.1

2. SuperSpeed Peripheral Only or SS-PO: A peripheral-only B-device which can operate at

SuperSpeed in addition to having peripheral-only B-device capabilities as described in [OTG&EH2.0].

3. SuperSpeed Peripheral Capable OTG Device or SSPC-OTG: An OTG device compliant with

[OTG&EH2.0] which can also operate as a SuperSpeed peripheral. Products with this configuration are

not able to operate as a SuperSpeed host. When operating as a peripheral, they can operate at either

SuperSpeed or [OTG&EH2.0] speeds. However they may only be able to swap roles when operating at

[OTG&EH2.0] speeds.

4. SuperSpeed OTG Device or SS-OTG: An OTG Device compliant with [OTG&EH2.0] which can also

operate as a SuperSpeed Host or a SuperSpeed Peripheral. Products with this configuration may be

able to dynamically swap host/peripheral roles while operating at SuperSpeed using the mechanisms

defined in this supplement.

Devices which conform to [OTG&EH2.0] are referred to as [USB2.0] devices in this supplement: USB2.0

EH, USB2.0 OTG and USB2.0 PO.

1.2 Related Documents

This is not a stand-alone document. It is a supplement to [USB3.0]. Any aspects of USB which are not

specifically changed by this supplement are governed by [USB3.0].

The following referenced documents can be found on the USB-IF website www.usb.org:

[USB3.0]

Universal Serial Bus Revision 3.0 Specification including ECNs and

errata.

[Micro-USB1.01]

Universal Serial Bus Micro-USB Cables and Connectors Supplement

to the USB 2.0 Specification, revision 1.01.

[USB2.0]

Universal Serial Bus Revision 2.0 Specification including ECNs and

errata.

[OTG&EH2.0]

[USBBattery1.2]

[xHCI]

On-The-Go and Embedded Host Supplement to the Universal Serial

Bus Revision 2.0 Specification including ECNs and errata.

USB Battery Charging Specification, revision 1.2.

eXtensible Host Controller Interface for Universal Serial Bus (xHCI),

revision 1.0

1.3 Terminology

“Shall” is normative and used to indicate mandatory requirements which are to be followed strictly in

order to conform with this standard.

“Should” is normative and used to indicate a recommended option or possibility.

“may” is normative and used to indicate permitted behavior.

“can” is informative and used to indicate behavior which is possible or may be seen

The use of “must” and “will” is deprecated for requirements and shall only be used for statements of fact.

On-The-Go and Embedded Host Supplement to the USB Revision 3.0 Specification Revision 1.1

1.4 Acronyms and Terms

This section lists and defines terms and abbreviations used throughout this specification.

ACA

Accessory Charger Adapter (see [USBBattery1.2]).

A-Device

Device with a Standard-A receptacle or a device with a Micro-A plug attached to

its receptacle. The A-device supplies power to V

BUS and is host at the start of a

session.

A-Host

A-Device operating as a host.

A-Port

Port featuring an A-type receptacle.

A-Peripheral

A-Device operating as a peripheral.

AB-Port

Port featuring an AB-type receptacle.

ADP

Attach Detection Protocol. A protocol which enables an OTG device or EH to

detect when a remote device has been attached or detached (as defined in

[OTG&EH2.0]).

ADP-capable

Device which is able to perform ADP probing and ADP sensing

ADP probing

This enables the local A-device or B-device to probe V

BUS and determine

whether a device is attached.

ADP sensing

This enables the local B-device to detect ADP probing generated by an

attached device. ADP sensing is not a requirement for A-devices.

Application

A generic term referring to any software that is running on a device that can

control the behavior or actions of the USB port(s) on a device.

Attach

This specification makes a distinction betw

een the words “attach” and “connect”.

A downstream device is considered to be attached to an upstream port when

there is a physical cable between the two.

B-Device

Device with:

• a Standard-B receptacle or,

• Mini-B receptacle, or

• Micro-B receptacle, or

• Micro-AB receptacle with either a Micro-B plug or no plug attached to its

receptacle, or

• a captive cable ending in a Standard-A or Micro-A plug.

The B-device is a peripheral at the start of a session.

B-Host

B-Device operating as a host.

B-Port

Port featuring a B-type receptacle.

B-Peripheral

B-Device operating as a peripheral.

Connect

This specification makes a distinction between the words “attach” and “connect”.

A downstream device is considered to be connected to an attached upstream

port when the upstream port has either pulled the D+ or D- data line high

An ADP-capable EH is not required to do ADP sensing since it is not able to operate in the B-device

position.

剩余73页未读，继续阅读

LoveScholar

粉丝: 0
资源: 12

USB 3.0 On-The-Go与嵌入式主机补充规范修订1.1

USB3.0 Host On-The-Go Standard

Hardware-Software Co-Design of Embedded Systems: The POLIS Approach

describe the difference between parallelism and concurrency in embedded system

stm32 usb otg fs

If you want an embedded database (H2, HSQL or Derby), please put it on the classpath.

implementation 'com.journeyapps:zxing-android-embedded:3.5.1'添加依赖时报错并提示Unexpected tokens (use ';' to separate expressions on the same line)

Embedded Linux Primer: A Practical, Real-World Approach

Experimental and numerical study on detection of sleeve grouting defect with impact-echo method原文

哪些书籍适合嵌入式linux的学习

gcc-linaro-6.3.1-2017.02-x86_64_aarch64-linux-gnu

Please design a C code routine for stm32F103 CAN

yolov3-tiny

有没有单片机用的数据库

qnx screen api

serial wire viewer

rapid io license

stm32L476HAL库中文编程手册和STM32标准库中文编程手册以及MSP430中文编程手册下载

jetson orin nx

real-time uml workshop for embedded systems

最新资源