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文库首页课程资源专业指导关于视频方面的EDID教材

关于视频方面的EDID教材

HDMI

EDID

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从外国网上下的一个EDID教材，还不错的。

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Implementing EDID That

Works

Neal Kendall & Je Stenhouse

EDID Presentation Overview



EDID Overview



EDID Operation



Implementing EDID



EDID compliance

EDID Overview



Common Terms

−

EDID “Extended Display Identication Data”

−

E-EDID “Enhanced…”

−

VESA “Video Electronics Standards Association”

−

DDC is a term used to describe the EDID data structure and I2C bus

protocol



What is an EDID?

−

EDID is a VESA creation to support Plug & Play

−

A data structure residing in a display or repeater; stored in 128 byte

blocks

−

EDIDs contain a lot of data in a very small size; the data is densely

stored

•

Data stored in bit format where values are binary in nature

•

Data stored in byte format using hex encoding

•

Sometimes values are truncated

•

Data is stored in an abbreviated form



What is the purpose of an EDID?

−

A display’s way of describing its identity and capabilities to a source,

e.g.: video formats, audio formats, colorimetry, lip-sync delays, etc.

−

Source (graphics card, DVD, STB, etc) can then select output (e.g.

video formats) in accordance with what display support

EDID Overview – EDID

Versions



EDID block structure in HDMI displays

−

VESA block (Block 0) is required

−

At least one CEA extension block is required

−

If more than one extension block is used they

must all be the same version



VESA EDID Versions

−

Version 1.3 (Version 1; Revision 3)

•

Version 1.3 is the required EDID structure for

CEA-861D-based HDMI displays

•

E-EDID is based on VESA version 1.3; supports

extensions

•

Current version of E-EDID is Release A; Revision 1

(2000)



CEA EDID extension versions

−

Dened in CEA-861D

−

HDMI monitors require version 3 of the CEA

extension in their EDID data structure



Backward compatibility facilitated by:

−

New EDIDs implemented in a display must

include all elds of past EDID versions

−

EDIDs include length elds for data block so

older sources can skip newer data blocks they

don’t understand

−

Inclusion of Detailed Timing Descriptors

Source (older)

DTV (newer)

HDMI (DDC)

CEA

Block

CEA

Block

CEA

Block

VESA

Block

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