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VESA 时序标准 CVT V1.2

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VESA Coordinated Video Timings (CVT) Standard V1.2. VESA官方时序标准，做显示驱动相关的可以参考

VESA Coordinated Video Timings Standard Version 1.2 Version 1.2

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

Preface

Intellectual Property

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.

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

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

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

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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