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&nb= sp;

 DDC/CI ä Standard

 

VESA= ä=

Video Electronics Stan= dards Association_______________________________­­

 

860 Hillview = Court, Suite 150     &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;          Phone:   (408) 957-9270

Milpitas, CA 95035            = ;            &n= bsp;            = ;            &n= bsp;            = ;            &n= bsp;       Fax:       (408) 957-9277

 

 

 

Display Data Channel Command Interface Standard

Version 1.1

October 29, 2004

 

Purpose

Define an I2C ä<= /span> based protocol which operates over the DDC channel to provide interactive control of a display and, optional associated devices.

 

Summary

In response to the Plug and Play needs of end-user= s, VESA has defined the E-DDC standard with different levels of communication. DDC/CI (formerly known as DDC2Bi) provides bi-directional communication bet= ween the host and the display.

 

The communication interface is independent of displ= ay technology (CRT, LCD, PDP, etc), and is compatible with a number of differe= nt video interfaces (VGA, DVI, HDMI, etc).

 

 

 

=

Preface

 

Scope

This revision of the DDC/CI Standard is intended to extend the E-DDC standard by providing flexibility and expandability for the DDC implementations in many video interfaces. DDC/CI providing a bi-directional communication channel t= hat can be used, along with the VESA Monitor Command and Control Set (MCCS) standard, to provide interactive control of a display.

 

Intellectual Property<= o:p>

Copyright © 1998 - 2004, Video Electronics Stan= dards Association.  All rights reser= ved.

 

While every p= recaution has been taken in the preparation of this standard, the Video Electronics S= tandards Association and its contributors assume no responsibility for errors or omissions, and make no warranties, expressed or implied, of functionality or suitability for any purpose.

 

Trademarks

All trademarks used within this document are the property of their respective owners. VESA, DDC, DPMS, E-DDC, EDID, E-EDID, MCCS and VDIF are trademarks = of the Video Electronics Standards Association.

 

I2C is a trademark owned by Philips.

HDMI is a trademark of= HDMI Licensing, LLC

DVI is a trademark of = the Digital Display Working Group

 

Patents

VESA proposals and standards are adopted by the Video Electronics Standards Association without regard to whether their adoption may involve any patent= s on articles, materials, or processes.  <= /span>Such adoption does not assume any liability to any patent owner, nor does it ass= ume any obligation whatever to parties adopting the proposals or standards  documents.

 

Support for this Standard

 

Clarifications and application notes to support this standard may be written.  To obtain the latest standard and = any support documentation, contact VESA.

 

If you have a product which incorporates DDC/CI, you should ask the company th= at manufactured your product for assistance.&= nbsp; If you are a manufacturer, VESA can assist you with any clarification you may require.  All comments= or reported errors should be  sub= mitted in writing to VESA using one of the following methods.

 

·         Fax     &n= bsp;            = ;      408-957-9277, direct this note to Technical Suppo= rt at VESA

 

·         e-mail     = ;   support@vesa.org (with subject: DDC/CI)

 

·         mail to    &nbs= p;  Technical Support

        &= nbsp;           &nbs= p;   VESA - Video Electronics Standards Association

        &= nbsp;           &nbs= p;   860 Hillview Court, Suite 150

        &= nbsp;           &nbs= p;   Milpitas, CA 95035<= /span>

=

Revision History

Version 1          August 14, 1998

Initial release of the standard

 

Version 1.1        O= ctober 29, 2004

Major reorganization and expansion= of sections that detail command structures

Added support for “table class” of VCP commands

Appendix on color adjustment delet= ed

Appendix added on possible problem= s if DDC/CI and HDCP (High Definition Content Protection) are both being used.

Support for EDID within the capabi= lity string eliminated

Power management priority given to= DPM (over DPMS)

 

=

 

Acknowledgments

 

This document would not have been possible witho= ut the efforts of the VESA Display Systems Standards (former Display) and Japan Committees. In particular, the following individuals and their companies contributed significant time and knowledge.

        &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;   

Ian Miller        &= nbsp;           &nbs= p;            Samsung           &nbs= p;            &= nbsp;           &nbs= p;        DDC/CI Task Group Chair    &nb= sp;  

   &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;     

Syed Athar Hussain=         &= nbsp;       ATI Technologies Inc.    &n= bsp;            = ; 

Bryan Speece        &= nbsp;           &nbs= p;    Entech Taiwan        &= nbsp;           &nbs= p;          =

Eiichi Mori        &= nbsp;           &nbs= p;        Fujitsu        &= nbsp;           &nbs= p;            &= nbsp;         

Eiji Kurimoto        &= nbsp;           &nbs= p;     Fujitsu        &= nbsp;           &nbs= p;            &= nbsp;         

Shinji Tsutsumi        &= nbsp;           &nbs= p;  Fujitsu        &= nbsp;           &nbs= p;            &= nbsp;         

Yuichiro Wada        &= nbsp;           &nbs= p;  Fujitsu

Graham Loveridge        &= nbsp;         Genesis Microchip     &nbs= p;            &= nbsp;     

Moriyoshi Ohara        &= nbsp;           IBM Japan      &n= bsp;            = ;            &n= bsp;    

Shiro Makino        &= nbsp;           &nbs= p;     EIZO NANAO      &n= bsp;            = ;            =

Tadahiko Hiraka        &= nbsp;            EIZO NANAO      &n= bsp;            = ;            =

Takuma Ishida        &= nbsp;           &nbs= p;   EIZO NANAO

Hiroaki Sugiura        &= nbsp;           &nbs= p; Mitsubishi        &= nbsp;           &nbs= p;            &= nbsp;   

Yoshifumi Sato        &= nbsp;           &nbs= p; NEC Plasma Display     = ;            &n= bsp;   

Jack Hosek        &= nbsp;           &nbs= p;        NEC-Mitsubishi (US)      &nb= sp;            =  

William Hollingwor= th        &= nbsp;    NEC-Mitsubishi (US)      &nb= sp;            =  

Hideki Tanizoe        &= nbsp;           &nbs= p;  NEC-Mitsubishi        &= nbsp;           &nbs= p;       

Kazuaki Takamoto        &= nbsp;        NEC-Mitsubishi        &= nbsp;           &nbs= p;       

Kazuyuki Iimura        &= nbsp;           NE= C-Mitsubishi        &= nbsp;           &nbs= p;       

Takashi Katagiri        &= nbsp;            NEC-Mitsubishi        &= nbsp;           &nbs= p;       

Kouichi Ara        &= nbsp;           &nbs= p;       NEC-Viewtechnology=

Takashi Nirasawa        &= nbsp;          NEC-View= technology

Yoshihisa Kudou        &= nbsp;           NE= C-Viewtechnology

Isaac Yang        &= nbsp;                  =    NVIDIA

Masafumi Ikeda        &= nbsp;            Pioneer Corp

Michael Anderson        &= nbsp;         Portrait Displays Inc.     =             &nb= sp;  

Keijiro Naito        &= nbsp;           &nbs= p;      Seiko Epson      &n= bsp;            = ;            &n= bsp;  

Shinji Kubota        &= nbsp;           &nbs= p;    Seiko Epson      &n= bsp;            = ;            &n= bsp;  

Chikaho Abe        &= nbsp;           &nbs= p;     Sony        &= nbsp;           &nbs= p;            &= nbsp;           

Satoru Suzuki        &= nbsp;           &nbs= p;    Sony        &= nbsp;           &nbs= p;            &= nbsp;           

Shigeru Takasu        &= nbsp;           &nbs= p;  Sony        &= nbsp;           &nbs= p;            &= nbsp;           

Steve Hasegawa        &= nbsp;           &nbs= p; Sony

Joe Lamm        &= nbsp;           &nbs= p;          Tech Source

Katsuki Hazama        &= nbsp;            THine Electronics

Mitsugu Yui        &= nbsp;           &nbs= p;       Totoku Electric Co. Ltd.    &n= bsp;          

Alain d’Haut= ecourt        &= nbsp;        ViewSonic        &= nbsp;           &nbs= p;            &= nbsp;  

=

 

Terms and Abbreviations

 

Abbreviation

Description

CRT

Cathode Ra= y Tube (display technology type)

E-DDC=

[VESA] Enh= anced Display Data Channel (serial communication)

DDC2B=

Simplest o= f the DDC2B modes defined in VESA E-DDC standard

DDC2Bi

Former nam= e for DDC/CI

DPM

[VESA] Dis= play Power Management standard

DPMS<= /o:p>

[VESA] Dis= play Power Management Signaling standard

E-EDID

[VESA] Enh= anced Extended Display Identification Data

EEPROM

Electrical= ly Erasable Programmable Read Only Memory (memory type)

HW

Hardware

I2C

Trademark = of Philips

LCD

Liquid Cry= stal Display

MCCS<= /o:p>

[VESA] Mon= itor Control Command Set

MCU

Micro Cont= roller Unit (Embedded in application)

MT

I2C Bus Master Transmitter Communication Mode

MR

I2C Bus Master Receiver Communication Mode

SR

I2C Slave Receiver Communication Mode

ST

I2C Slave Transmitter Communication Mode

SW

Software

VCP

Virtual Co= ntrol Panel

VDIF<= /o:p>

[VESA] Vid= eo Display Identification Format

VESA<= /o:p>

Video Elec= tronics Standards Association

 

 
Table of Content= s

1.       OVERVIEW..........................................= ...........................................................................= ..... 9=

1.1     Summary.....................................................................= ....................................................... 9=

1.2     Background..................................................................= ................................................. 9=

1.3     VCP Codes...................................................................= ....................................................... 9=

1.4     Standard Objectives.................................................................= .............................. 10=

1.5     Reference Documents.................................................................= ............................ 11=

1.6     I2C Bus Notation:..........................................= ............................................................... 12=

2.       DDC/CI System Architecture.................= ........................................................... 13=

2.1     DDC/CI Introduction.................................................................= ................................ 13=

2.2     DDC/CI Host Device.................................................................= .................................... 13=

2.3     DDC/CI Display Device.................................................................= ............................. 13=

2.4     Display Dependent Devices..........................................= ........................................ 14=

2.5     Fixed I2C Slave Address Devic= es..........................................= ............................. 14=

3.       DDC/CI Hardware Implementation.............= .................................................. 15=

3.1     Host Device.................................................................= ................................................... 15=

3.2     Display Device..............................................................= ............................................... 15=

3.3     Display Dependent devices..........................................= ........................................ 15=

3.3.1=       External Display Dependent Devices...........= .................................................................. <= !--[if supportFields]> PAGEREF _Toc86738936 \h 15

3.3.2=       Internal Display Dependent Devices...........= ................................................................... = 15

3.4     Fixed address I2C devices..........................................= ............................................ 16=

4.       DDC/CI COMMUNICATION BASIC COMMANDS........= ........................................... 17=

4.1     DDC/CI Compliance Requirements..........................................= .......................... 17=

4.1.1=       VCP Capabilities........................= ...........................................................................= ......... 17

4.1.2=       MCCS Version.............................= ...........................................................................= ........ 18

4.2     Optional Support.................................................................= ...................................... 18=

4.2.1=       E-EDID Information.........................= ...........................................................................= ... 18

4.3     Get VCP Feature & VCP Feature Reply<= span style=3D'mso-tab-count:1 dotted'>..........................................= .................. 19=

4.4     Set VCP Feature.................................................................= .......................................... 20=

4.5     Save Current Settings.................................................................= ........................... 20=

4.6     Capabilities Request & Capabilities = Reply..........................................= ....... 21=

4.7     Get Timing Report & Timing Message..........................................= ..................... 22=

4.8     “Table” Commands..........................................= ........................................................... <= !--[if supportFields]>= PAGEREF _Toc86738950 \h = 23=

4.8.1=       Table Write...............................= ...........................................................................= ........... 23

4.8.2=       Table Read................................= ...........................................................................= ........... 24

5.       Communications Protocol............................= ................................................... 25=

6.       DDC/CI Software Implementation.............= ................................................... 26=

6.1     Data Return Format : Display to Host..........................................= ................ 26=

6.2     Graphic Host to Display Device Messages<= span style=3D'mso-tab-count:1 dotted'>..........................................= ........ 26=

6.3     Display Device to Graphic Host Messages<= span style=3D'mso-tab-count:1 dotted'>..........................................= ........ 27=

6.4     Definition and Use of the “Null Message”......................= ............................ 28=

6.5     Communication Between the Host and its D= evices............................... 29=

6.5.1=       Message Buffer Size Requirements............= ..................................................................... 29

6.6     I2C Bus Timings..........................................= .................................................................... 29=

6.7     Messages Support.................................................................= ...................................... 30=

6.7.1=       Power Management..........................= ...........................................................................= ... 30

6.7.2=       ID String..............................= ...........................................................................= ................ 30

6.7.3=       Capability String..............................= ...........................................................................= .... 30

6.7.4=       Vendor Specific Messages...................= ...........................................................................= . 30

6.7.5=       Application Specific Messages...................= ..................................................................... 31

6.7.6=       Hot Plugging Mechanism..................= ...........................................................................= .. 31

7.       DDC/CI Support of Display Dependent Devices= ..................................... 32=

7.1     External Display Dependent Device..........................................= ................... 32=

7.1.1=       Message Sent to the External Device.........= ..................................................................... 32

7.1.2=       Message Sent (Reply) from the External Device............................................................. 32

7.2     Internal Display Dependent Device..........................................= .................... 32=

7.2.1=       Message Sent to the Internal Device.........= ...................................................................... 32

7.2.2=       Message Sent (Reply) from the Internal Device.............................................................. 32

7.3     Detection of Display Dependent Device..........................................= ............ 32=

7.4     Example of Internal and External Device Communication.......... 33=

7.5     Dependencies Between the Display and Integrated Devices......... <= /span>33=

8.       DDC/CI Implementation Examples.............= .................................................... 35=

8.1     Multiple Video Interface Support and Implementation................... 35=

8.2     Television/Home Theater Support and Spec= ific Commands.............. 35=

8.3     Video Switch Boxes.................................................................= .................................. 35=

8.4     Multiple Display Support..........................................= ........................................... 35=

8.5     Video Projection Displays..........................................= ......................................... 36=

9.       DDC/CI Compliance..........................= ......................................................................... <= /span>37=

9.1     Existing Display Designs..........................................= ............................................. 37=

9.2     New Display Designs.................................................................= ............................... 37=

9.3     Existing Graphic Host Systems..........................................= ................................ 37=

9.4     New Graphic Host Systems..........................................= .......................................... 37=

10.     Appendix A: Co-existance of DDC/CI and HDCP.....= .................................. 38=

11.     APPENDIX B= : DPM (DPMS) and MCCS Power Management....= ................ 39=

12.     Appendix C: Summary of Op. Codes................= ................................................ 40=

13.     APPENDIX D: Answers To Commonly Asked Questions.= ..................... 41=

 

 

 

Table 1 : DDC Modes. 9

Tabl= e 2 - Reference Documents. 11

Tabl= e 3 - I2C Notation. <= /span>12

Tabl= e 4 : Examples of External Display Dependent Devices. 15

Tabl= e 5 : Examples of Fixed I2C Address devices. 16

Tabl= e 6 : I2C Bus Notation. 17

Tabl= e 7 : Capability String Fields. 30

Tabl= e 8 - FAQ.. 41

 

Figure 1: Key Elements of a = DDC/CI System.. = 13

Figu= re 2 - Recommended SCL and SDA Line Terminations. 37

 

1.&n= bsp;            = ;   OVERVIEW

1.1          &nb= sp;  Summary

This standard defines= a bidirectional communications channel between a host device and a display us= ing the Display Data Channel (defined in the VESA E-DDC standard) as the physic= al layer.  Implementation allows = interaction beteen the host and display devices.

 

The main changes in t= his revision are the provision of support for the ‘table class’ of = VCP codes introduced in the MCCS standard version 2 and to restructure and expa= nd the explanations of command structures. Minor changes included elimination = of the references to unused standards and other points to improve clarity.

 

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