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VESA Coordinated Video Timings Standard Version 1.2 Version 1.2
©Copyright 2003-2013 Video Electronics Standards Association Page 1 of 26
39899 Balentine Drive, Suite 125 Phone: 510 651 5122
Newark, CA 94560 Fax: 510 651 5127
VESA Coordinated Video Timings (CVT) Standard
Version 1.2
February 8, 2013
Purpose
The VESA Coordinated Video Timings (CVT) Standard is a method for generating a consistent and
coordinated set of standard formats, display refresh rates and timing specifications for computer display
products, both those employing CRT and those using other display technologies. The intention of this
standard is to give source and display manufacturers a common set of tools to enable new timings to be
developed in a consistent manner that ensures greater compatibility.
Summary
CVT defines rules and methods by which new and existing formats can be defined. Based primarily on the
VESA GTF Standard, CVT defines restrictions to pixel clock modularity, refresh rate and aspect ratio. The
standard also specifies a new equation-based method for developing Reduced Blanking timings designed for
use with non-CRT displays that can accept Reduced Horizontal Blanking times.
VESA Coordinated Video Timings Standard Version 1.2 Version 1.2
©Copyright 2003-2013 Video Electronics Standards Association Page 2 of 26
Preface
Intellectual Property
Copyright © 2003-2013 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. EDID, E-EDID, DDC,
and VESA are trademarks of the Video Electronics Standards Association.
I
2
C is a trademark owned by Philips.
Patents
VESA draws attention to the fact that it is claimed that compliance with this standard may involve the use of a
patent or other intellectual property right (collectively, “IPR”) concerning CVT. VESA takes no position
concerning the evidence, validity, and scope of this IPR.
Attention is drawn to the possibility that some of the elements of this VESA Standard may be the subject of
IPR other than any identified above. VESA must not be held responsible for identifying any or all such IPR,
and has made no inquiry into the possible existence of any such IPR.
THIS STANDARD IS BEING OFFERED WITHOUT ANY WARRANTY WHATSOEVER, AND IN
PARTICULAR, ANY WARRANTY OF NON-INFRINGEMENT IS EXPRESSLY DISCLAIMED. ANY
IMPLEMENTATION OF THIS STANDARD MUST BE MADE ENTIRELY AT THE IMPLEMENTER’S
OWN RISK, AND NEITHER VESA, NOR ANY OF ITS MEMBERS OR SUBMITTERS, MUST HAVE
ANY LIABILITY WHATSOEVER TO ANY IMPLEMENTER OR THIRD PARTY FOR ANY DAMAGES
OF ANY NATURE WHATSOEVER DIRECTLY OR INDIRECTLY ARISING FROM THE
IMPLEMENTATION OF THIS STANDARD.
VESA Coordinated Video Timings Standard Version 1.2 Version 1.2
©Copyright 2003-2013 Video Electronics Standards Association Page 3 of 26
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 CVT, 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 : 510 651 5127, direct this note to Technical Support at VESA
• e-mail: support@vesa.org
• mail: Technical Support
Video Electronics Standards Association
39899 Balentine Drive, Suite 125
Newark, CA 94560
VESA Coordinated Video Timings Standard Version 1.2 Version 1.2
©Copyright 2003-2013 Video Electronics Standards Association Page 4 of 26
Revision History
Version 1.1 September 10, 2003
Section 3.4.1, points 6 & 7 revised to correct mistake (minimum Vertical Sync and Vertical Back Porch time
is 550us not 500us). Rounding errors in VESA Standard Names corrected in Table 3 and 7. Missing
Constants and Variables added to Table 9 and 10.
Version 1 March 26, 2003
Initial release of the standard
Version 1.2, February 8, 2013
Added section defining the timing generation rules for reduced blanking v2 rules.
Updated sections 3.3.1, 3.4.3 and 5.4 to clarify the refresh rate error calculation and timing generation for
video optimized vs. non-video optimized refresh rate
VESA Coordinated Video Timings Standard Version 1.2 Version 1.2
©Copyright 2003-2013 Video Electronics Standards Association Page 5 of 26
Acknowledgements
This document would not have been possible without the efforts of the VESA DisplayPort Task Group. In
particular, the following individuals and their companies contributed significant time and knowledge to this
version of the CVT Standard.
Table 1-0: Contributors to Version 1.2
Name
Company
Contribution
Syed Athar Hussain
AMD
Document Editor
David Glen
AMD
Quinn Carter
AMD
Greg Stewart
Analogix Semiconductor
Colin Whitby-Strevens
Apple
Jamie Johnston
Intel
Mrinalini Attaluri
Intel
Jean-Jacques Ostiguy
Matrox Graphics, Inc.
David Stears
Nvidia
Craig Wiley
Parade Technologies
Mark Stockfisch
Quantum Data, Inc.
Alan Kobayashi
STMicroelectronics
Task Group Chair
Prashant Shamarao
Synaptics
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