www.the-av-experts.com For more information:

www.the-av-experts.com

Micro USB

Transmitter end (TX end) = source Receiver end (RX end) = sink

HDMI type A3MHL+

2MHL–

5GND

4CBUS

1 VBUS

18VBUS

9MHL–

7MHL+

19CBUS

GND17,11,5

CBUS

TMDS channel (MHL–/MHL+)

VBUS

GND

1x buffering

Commonmodemodulaton

MHL streamData islandencoding

EncryptionAudio/videoand controllogic

CH0

CH2Content

Pixel clock

MHL clock

MHL+/MHL–

Period control signal

CH2 CH1 CH0

t2 t1 t0

3x clock multiplier

Video encoding

Control periodencoding

Logical channels Physical channel

CH1

½x multiplier

Commonmodemodulaton

MHL streamData islandencoding

EncryptionAudio/videoand controllogic

CH0

CH1Content

Pixel clock

MHL clock

Period control signal

CH1 CH0 CH1

t3 t2 t1

CH0

t0

2x clock multiplier

Video encoding

Control periodencoding

Logical channels Physical channel

Commonmodedemodulaton

MHL streamTMDSdecoding

DecryptionAudio/video and controllogic

CH0

CH1

CH2Content

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1x buffering Pixel clock

MHL clock

Period control signal

CH2 CH1 CH0

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MHL+/MHL–

Commonmodedemodulaton

MHL streamTMDSdecoding

DecryptionAudio/video and controllogic

CH0

CH1Content

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MHL clock

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0x00

MHL (Mobile high-defi nition link)Technical overview

Mobile high-definition link

MHL is the new leading mobile device interface for transmitting video and audio. This interface can connect smartphones, tablet PCs and video cameras with display equipment such as TV sets, projectors and monitors. MHL uses the micro USB port which is already available on many mobile devices. The USB interfac e can be used for data connections to a PC as usual. When the built-in MHL transmitter chip recognizes an MHL-capable receiver at the other end, it switches into the MHL transmit mode. The MHL transmitter then sends the AV data over two of the fi ve pins on the micro USB port. The control signals are transmitted via one of the other pins. The 5 V line is used to charge the mobile device while transmitting.

Key features of MHL: ❙ HD video and digital audio: 1080p/60 video and up to 192 kHz 7.1 surround audio ❙ Utilization of existing connectors ❙ Low pin-count interface: HD video and digital audio over a 5-pin interface which includes control and power ❙ Provision of power to the mobile device: 5 V and 900 mA ❙ Content protection: full support of high-bandwidth digital content protection (HDCP)

Supported video formatsIndex Mode Refresh1 640×480 (VGA) 59.94/602,3 720×480p 59.94/6017,18 720×576p 504 1280×720p 59.94/6019 1280×720p 505 1920×1080i 59.94/6020 1920×1080i 5016 1920×1080p 59.94/6031 1920×1080p 5034 1920×1080p 306,7 720 (1440)×480i 59.94/6021,22 720 (1440)×576i 50

Glossary:CBUS = MHL link control bus, DVI = digital visual interface, E-EDID = enhanced extended display identifi cation data, GND = ground, HD = high defi ntion, HDCP = high- bandwidth digital content protection, HDMI = high defi nition multimedia interface, MHL = mobile high-defi nition link, MSC = MHL sideband channel, RAP = request action protocol, RCP = remote control protocol, SD = standard defi nition, TMDS = transition-minimized differential signaling, UCP = UTS-8 character protocol, USB = universal serial bus, VBUS = MHL voltage busSources: MHL Specifi cation

Rohde & Schwarz as a valued partner of consumer electronics manufacturers offers test and measurement solutions for MHL.

Rohde & Schwarz solutions for MHL

MHL link control bus (CBUS) MHL voltage bus (VBUS)

The point-to-point single-wire CBUS provides the following functionality: ❙ A mechanism allowing source and sink devices to detect connectivity to an MHL-compliant sink and source device, respectively ❙ A communications channel for DDC commands that is used by an MHL source device to determine the capabilities and characteristics of the sink device by reading the EDID data structure

❙ A communications channel for DDC commands that is used by an MHL source device to initiate all register reads and writes required for content protection

❙ An MHL sideband channel (MSC) is provided for higher-level user functions such as automatic setup tasks or tasks typically associated with infrared remote control usage: remote control protocol (RCP), UTS-8 character protocol (UCP), request action protocol (RAP)

The CBUS has suffi cient headroom to be used for other protocols in the future.

The VBUS provides a minimum of 5 V/900 mA power between sink (e.g. TV) and source (e.g. mobile phone).

TMDS is used to carry all audio and video data as well as auxiliary data (such as InfoFrame packets) that describes the active audio and video streams. The bit stream is modulated by a clock signal. In 24-bit mode, MHL uses a single differential channel to transmit TMDS data that, for example, is carried over three different channels in DVI. The incoming three-channel data needs to be packed into one TMDS channel at the TX end and unpacked into three channels at the RX end. There is one TMDS encoder at the TX end and one TMDS decoder at the RX end. TX data is multiplexed into a single lane prior to being encoded. RX data is decoded prior to being demultiplexed into three lanes. In PackedPixel mode, only two channels are multiplexed: channel 0 and channel 1. One clock period of the MHL clock equals two periods of the pixel clock. Each period of the MHL clock transmits four TMDS characters.

3D video modesIndex Mode Refresh 3D mode4 1280×720p 59.94/60 top-bottom

frame sequential

19 1280×720p 50 top-bottomframe sequential

5 1920×1080i 59.94/60 left-right20 1920×1080i 50 left-right32 1920×1080p 24 top-bottom

frame sequential

TMDS protocol video and audio formats

TMDS channel

24 bit per pixel are transferred

16 bit per pixel are transferred

Interfaces and pin assignment

24-bit mode

PackedPixel mode

Link

Link

Link

¸VTS compact video tester ¸VTC video test center¸VTE video tester

Pixel encodingYCbCr 4:2:2YCbCr 4:4:4RGB 4:4:4

Audio formatsL-PCM 8 channel audioChannel assignment in line with CEA-861ESupported audio sample rates32 kHz 48 kHz44.1 kHz 96 kHz88.2 kHz 192 kHz176.4 kHz

Supported color spacesSD: ITU-R Rec. BT.601HD: ITU-R BT.709-5Additional: xvYCC, sYCC601, AdobeYCC601, AdobeRGB

MHL_po_en_folded_3606-6792-82_v0400.indd 1MHL_po_en_folded_3606-6792-82_v0400.indd 1 15.07.2013 11:52:5815.07.2013 11:52:58

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any (as)

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MH

L (Mobile H

igh-defi nition Link) Technical O

verview

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-exp

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For m

ore

info

rmat

ion:

ww

w.th

e-av

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ro U

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MHL_po_en_folded_3606-6792-82_v0400.indd 2MHL_po_en_folded_3606-6792-82_v0400.indd 2 15.07.2013 11:53:1115.07.2013 11:53:11