DDC/CI
™
Standard
39899 Balentine Drive, Suite 125
Newark, CA 94560
Phone:
Fax:
510 651 5122
510 651 5127
Display Data Channel Command Interface Standard
Version 1.1
October 29, 2004
Purpose
Define an I
2
C
™
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-users, VESA has defined the E-DDC standard with
different levels of communication. DDC/CI (formerly known as DDC2Bi) provides bi-directional
communication between the host and the display.
The communication interface is independent of display technology (CRT, LCD, PDP, etc), and is
compatible with a number of different video interfaces (VGA, DVI, HDMI, etc).
VESA DDC/CI Standard
©Copyright
1997-2004 Video Electronics Standards Association
Page 1 of 42
Version 1.1
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 that can be used, along with the VESA Monitor Command and Control Set (MCCS)
standard, to provide interactive control of a display.
Intellectual Property
Copyright © 1998 - 2004, Video Electronics Standards Association. All rights reserved.
While every precaution has been taken in the preparation of this standard, the Video Electronics Standards
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.
I
2
C 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 patents on articles, materials, or processes. Such adoption does not
assume any liability to any patent owner, nor does it assume 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 that manufactured your product
for assistance. If you are a manufacturer, VESA can assist you with any clarification you may require. All
comments or reported errors should be submitted in writing to VESA using one of the following methods.
•
•
•
Fax
e-mail
mail to
510 651 5127,
direct this note to Technical Support at VESA
support@vesa.org (with subject: DDC/CI)
Technical Support
VESA - Video Electronics Standards Association
39899 Balentine Drive, Suite 125
Newark, CA 94560
VESA DDC/CI Standard
©Copyright
1997-2004 Video Electronics Standards Association
Page 2 of 42
Version 1.1
Revision History
Version 1
August 14, 1998
Initial release of the standard
Version 1.1
October 29, 2004
Major reorganization and expansion of sections that detail command structures
Added support for “table class” of VCP commands
Appendix on color adjustment deleted
Appendix added on possible problems if DDC/CI and HDCP (High Definition Content Protection) are both being
used.
Support for EDID within the capability string eliminated
Power management priority given to DPM (over DPMS)
VESA DDC/CI Standard
©Copyright
1997-2004 Video Electronics Standards Association
Page 3 of 42
Version 1.1
Acknowledgments
This document would not have been possible without 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
.
Ian Miller
Syed Athar Hussain
Bryan Speece
Eiichi Mori
Eiji Kurimoto
Shinji Tsutsumi
Yuichiro Wada
Graham Loveridge
Moriyoshi Ohara
Shiro Makino
Tadahiko Hiraka
Takuma Ishida
Hiroaki Sugiura
Yoshifumi Sato
Jack Hosek
William Hollingworth
Hideki Tanizoe
Kazuaki Takamoto
Kazuyuki Iimura
Takashi Katagiri
Kouichi Ara
Takashi Nirasawa
Yoshihisa Kudou
Isaac Yang
Masafumi Ikeda
Michael Anderson
Keijiro Naito
Shinji Kubota
Chikaho Abe
Satoru Suzuki
Shigeru Takasu
Steve Hasegawa
Joe Lamm
Katsuki Hazama
Mitsugu Yui
Alain d’Hautecourt
Samsung
ATI Technologies Inc.
Entech Taiwan
Fujitsu
Fujitsu
Fujitsu
Fujitsu
Genesis Microchip
IBM Japan
EIZO NANAO
EIZO NANAO
EIZO NANAO
Mitsubishi
NEC Plasma Display
NEC-Mitsubishi (US)
NEC-Mitsubishi (US)
NEC-Mitsubishi
NEC-Mitsubishi
NEC-Mitsubishi
NEC-Mitsubishi
NEC-Viewtechnology
NEC-Viewtechnology
NEC-Viewtechnology
NVIDIA
Pioneer Corp
Portrait Displays Inc.
Seiko Epson
Seiko Epson
Sony
Sony
Sony
Sony
Tech Source
THine Electronics
Totoku Electric Co. Ltd.
ViewSonic
DDC/CI Task Group Chair
VESA DDC/CI Standard
©Copyright
1997-2004 Video Electronics Standards Association
Page 4 of 42
Version 1.1
Terms and Abbreviations
Abbreviation
CRT
E-DDC
DDC2B
DDC2Bi
DPM
DPMS
E-EDID
EEPROM
HW
I
2
C
LCD
MCCS
MCU
MT
MR
SR
ST
SW
VCP
VDIF
VESA
Description
Cathode Ray Tube (display technology type)
[VESA] Enhanced Display Data Channel (serial communication)
Simplest of the DDC2B modes defined in VESA E-DDC standard
Former name for DDC/CI
[VESA] Display Power Management standard
[VESA] Display Power Management Signaling standard
[VESA] Enhanced Extended Display Identification Data
Electrically Erasable Programmable Read Only Memory (memory type)
Hardware
Trademark of Philips
Liquid Crystal Display
[VESA] Monitor Control Command Set
Micro Controller Unit (Embedded in application)
I
2
C Bus Master Transmitter Communication Mode
I
2
C Bus Master Receiver Communication Mode
I
2
C Slave Receiver Communication Mode
I
2
C Slave Transmitter Communication Mode
Software
Virtual Control Panel
[VESA] Video Display Identification Format
Video Electronics Standards Association
VESA DDC/CI Standard
©Copyright
1997-2004 Video Electronics Standards Association
Page 5 of 42
Version 1.1
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