MHL协议规范1.0版：移动设备高清视频输出标准

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"MHL_Specification_V10.pdf" 是MHL（Mobile High-definition Link）协议的1.0版本规范，由Nokia Corporation、Samsung Electronics Corporation、Silicon Image, Inc.、Sony Corporation和Toshiba Corporation等MHL推广者共同制定。这份文档属于机密信息，不应用于传播。 MHL协议是一种专门设计用于移动设备（如智能手机和平板电脑）的高清视频和音频输出技术。它允许这些设备通过标准的HDMI接口连接到电视、显示器或其他高清音频/视频接收设备，提供高质量的多媒体体验。MHL技术的核心是将移动设备上的微小USB或micro-USB接口转换为高带宽的HDMI信号，实现高清内容的传输。在MHL 1.0版本规范中，可能包括以下关键知识点： 1. **接口兼容性**：MHL技术利用了常见的micro-USB接口，这使得大多数现代移动设备无需额外适配器即可与MHL兼容的显示设备连接。 2. **带宽与分辨率**：MHL 1.0支持最高1080p的全高清视频输出，提供多种分辨率选项，以适应不同的显示设备需求。 3. **多声道音频**：除了视频，MHL还支持传输多声道音频，如Dolby Digital和DTS，以确保家庭影院级别的音质体验。 4. **电源管理**：MHL协议允许设备通过连接线从显示设备获取电力，从而在输出视频的同时为移动设备充电，解决了长时间使用时的电池问题。 5. **设备控制**：用户可以通过MHL连接控制移动设备，如播放/暂停、快进/快退等操作，增强了用户体验。 6. **数据交换**：MHL规范可能还包括设备间的数据交换能力，比如照片、视频的传输，或者同步设备内容至外部存储。 7. **兼容性与互操作性**：MHL 1.0规范确保不同品牌和型号的MHL兼容设备之间的互操作性，以实现无缝连接和内容共享。 8. **版权保护**：考虑到高清内容的版权保护，MHL协议可能包含数字版权管理（DRM）机制，以保护内容的安全性和合法性。 9. **版本升级**：随着技术的发展，MHL后续可能会有更高级别的版本，例如MHL 2.0、3.0等，提升带宽、增加支持的设备功能，如支持4K超高清视频等。 10. **市场应用**：MHL技术在消费电子市场广泛应用于电视、汽车娱乐系统、投影仪等产品，为移动设备提供了便捷的高清内容分享途径。请注意，上述内容是基于MHL协议的一般知识和常见特性，具体的技术细节和限制应在MHL 1.0规范文档中查找。由于文档本身为机密，无法提供详细的技术规格，但这些基本信息描绘了MHL协议的基本功能和重要性。

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MHL™ (Mobile High-definition Link)

Specification

Revision 1.0 Confidential Information of the MHL Promoters June 2010

2 Definiti ons

2.1 Conformance Levels

Conformance Description

Expected

A key word used to describe the behavior of the hardware or software in the

design models assumed by this Specification. Other hardware and software

design models may also be implemented.

May A key word that indicates flexibility of choice with no implied preference.

Shall

A key word indicating a mandatory requirement. Designers are required to

implement all such mandatory requirements.

Should

A key word indicating flexibility of choice with a strongly preferred

alternative. Equivalent to the phrase is recommended.

Reserved fields

A set of bits within a data structure that are defined in this specification as

reserved, and are not otherwise used. Implementations of this specification

shall zero these fields. Future revisions of this specification, however, may

define their usage.

Reserved values

A set of values for a field that are defined in this specification as reserved,

and are not otherwise used. Implementations of this specification shall not

generate these values for the field. Future revisions of this specification,

however, may define their usage.

2.2 Glossary of Term s

Term Definition

(Audio) Channel Audio data meant to be delivered to a single audio speaker

Audio-Only Device

An MHL Source which outputs only audio content, although it is

transported with a link clock and video control signals but no video pixel

data: ―blank video‖; or an MHL Sink which takes in audio only and

ignores any video content on the MHL stream.

Audio Sample

Clock

Original clock related to the audio input samples at the Source device or

the generated clock used to time the output of audio samples from the

Sink.

Basic Audio Stereo audio, a minimum requirement on an MHL interconnect.

BCH

Error correction technique named after the developers: Bose, Chauduri,

and Hocquenghem.

Blank Video

A video stream having compliant sync timings and DE timings, but with

no picture content, i.e., all pixels in a frame are the same color or

otherwise have no content from the original stream.

Byte Eight bits of data.

Category

A classification of MHL system type. MHL Sources and MHL Sinks are

defined categories.

CBUS

MHL Link Control Bus. This is a single-wire bus used to carry auxiliary

data between an MHL source and an MHL sink. Not to be confused with the

CBUS described in the I2C Specification.

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MHL™ (Mobile High-definition Link)

Specification

Revision 1.0 Confidential Information of the MHL Promoters June 2010

Term Definition

Chroma Sampling

Indication if a video signal has ―full‖ (―4:4:4‖) or ―half‖ (―4:2:2‖) chroma

bandwidth. ―Full chroma bandwidth‖ indicates that there is one Cb and

one Cr sample for every Y sample (i.e. for every pixel in the video). ―Half

chroma bandwidth‖ indicates that there is only one Cb sample for every

two Y samples and one Cr sample for every two Y samples.

Connector

A general term inclusive of plugs and receptacles. A connector has a

specific signal list and pin assignment.

Command

An operation, indicated by a numerical value or opcode, carried in a

control

packet on CBUS, which is intended by one MHL device to be

performed by another, connected MHL device.

Data Island

A sequence of TMDS characters, beginning with a leading guard band,

ending with a trailing guard band, and containing one of more packets.

Data Stream

Disparity

Integer indicating ―DC-offset‖ level of link. A positive value represents

the excess number of ―1‖s that have been transmitted. A negative value

represents the excess number of ―0‖s that have been transmitted.

Dongle See ―MHL Dongle‖, below.

Downstream

In the direction of the primary audio and video data flow, i.e. towards the

Sink.

Hot Plug Detect

A signal indicated in the Source on receipt of SET_HPD or CLR_HPD

command from the Sink, which indicates the availability of the DDC sub-

channel for EDID and HDCP.

Link Clock

A clock used across the link from MHL Source to MHL Sink (or Dongle),

proportional to the video mode being transported. See Section 4.1.1.

Logical Channel

MHL has three logical data channels composed of the three data streams

that are time-domain multiplexed onto the physical channel – Channel 0,

Channel 1 and Channel 2.

MHL Cable

A device with one MHL input and one MHL output, with a plug and not

a receptacle at each end.

MHL Component

A device which implements a subset of the functionality required of an

MHL Source or Sink device. The supplier of the Component indicates

exactly which MHL functions are supported by the Component. It shall

be possible to design an MHL-compliant system that uses the Component

to perform the MHL functions implemented in the Component as

indicated by the Component supplier.

MHL Dongle

A device with one MHL input and one non-MHL output, which does not

provide a display or audible rendering of content, nor necessarily provide

power to the Source attached at its input. A Dongle may be powered from

its own power source, or may be powered from the upstream MHL

Source. An MHL Dongle shall have a plug at its MHL input, and may

have either a plug or receptacle at its non-MHL output.

MHL Sink

A device with one or more MHL input port. An MHL Sink shall use a

receptacle and not a plug at each MHL input port.

MHL Source

A device with an MHL output port. An MHL Source shall use a

receptacle and not a plug at its MHL output port.

Multi-channel

(Audio)

More than two audio channel audio. Typically this term is applied to 6

(5.1) channel streams. Also called surround formats.

18/222

MHL™ (Mobile High-definition Link)

Specification

Revision 1.0 Confidential Information of the MHL Promoters June 2010

Term Definition

PackedPixel

A method of encoding pixel data. Only 16 bits of data are encoded, and

transmitted, rather than the 24 bits per pixel as in the other pixel encoding

modes.

Packet

In the context of CBUS, a sequence of bits sent across CBUS, beginning

with a SYNC and ending with link layer ACK, containing a payload of 8

bits. Packets may be control packets or data packets.

In the context of TMDS signaling, a 32-byte sequence of payload data, as

part of a data island.

Physical Channel

MHL has one physical data channel composed of the single differential

pair carrying TMDS data.

Pixel

Picture Element. Refers to the actual element on the display and the data

point in the digital video stream representing such an element. This term

may also apply to the data that is carried across the MHL link during a

single pixel clock cycle, even if that data does not actually represent a

picture element.

Plug

A type of connector which, on its outermost dimension, is inserted into a

receptacle. A plug is the normal termination on either end of a cable.

RGB

Digital representation of any video signal using a red/green/blue color

spaces.

Receiver

An MHL Component that is responsible for receiving the single physical

channel (three logical channels) at the input to an MHL Sink device and

converting that signal into a digital output indicating a 24 bit, 12 bit, or 8

bit TMDS decoded word and indicating the TMDS coding mode used to

decode those bits. This digital output may be contained within a

semiconductor device or may be output from a semiconductor device.

Receptacle

A type of connector which receives a plug to complete an interconnection

between two systems. In most cases a receptacle has an opening into

which a plug is inserted. The pin assignment of the receptacle must match

the pin assignment of the mating plug across the set of conducting

surfaces.

Requester

An MHL device which uses the CBUS MSC to perform a command to

another MHL device – the responder.

Responder

An MHL device which uses the CBUS MSC to respond to a requested

command from a requester.

Receiver Sense

A signal sensed by an MHL Source which indicates that the 2 TMDS

signals between the Source and the Sink (or Dongle) are terminated to an

active voltage.

Sink See ―MHL Sink‖, above.

Source See ―MHL Source‖, above.

Stereo 2 audio channel audio, one left and one right.

Stream

A time-ordered set of digital data originating from one Source and

terminating at one Sink. A stream is characterized by bounded

bandwidth requirements and by synchronization points, or time stamps,

within the stream data.

Sub-command

An operation, indicated by a numerical value or opcode, carried in a data

packet on CBUS, which is intended by one MHL device to be performed

by a second, directly-connected MHL device.

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