E-EDID验证指南：确保显示器数据结构合规

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"EEDIDverifGuideRa.pdf 是一份关于增强型扩展显示标识数据（E-EDID）验证指南的文档，与VESA增强型E-EDID标准（发布A，修订2）配套使用。该指南定义了一个测试过程，用于检查EDID数据结构版本1，修订4（简称“EDID 1.4”）是否符合E-EDID标准（发布A，修订2）。正确使用此文档有助于确保EDID 1.4数据表中的必要和可选数据字段（元素）内容正确。这份指南包含了对EDID 1.4结构的详细测试用例，以确保其遵循VESA的E-EDID标准。" E-EDID（增强型扩展显示标识数据）是视频电子标准协会（VESA）制定的一种标准，用于在数字显示设备和图形适配器之间交换显示器的配置信息。这份验证指南（Release A, 修订2）是为确保显示器制造商的产品遵循E-EDID标准而编写的，目的是保证设备间的兼容性和互操作性。该指南详细阐述了如何测试EDID 1.4数据结构的合规性，其中涵盖了以下几个方面： 1. **数据结构一致性**：测试EDID 1.4数据块的结构是否符合标准，包括基本的头部信息、制造商信息、显示器描述、颜色特征、物理尺寸、最大像素时钟等。 2. **必需字段检查**：确保所有必需的数据字段如基本显示器描述块、扩展显示器描述块等都已正确填充，并且符合规范。 3. **可选字段验证**：检查可选数据字段，如颜色空间、视图模式、视频定时信息等，这些信息对于支持多种显示配置和高级功能至关重要。 4. **错误检测**：通过一系列测试用例来检测潜在的错误，如无效的像素时钟值、超出范围的分辨率设置或不正确的颜色特性。 5. **兼容性测试**：验证显示器与不同操作系统、显卡和其他硬件的兼容性，确保设备在各种环境下都能正常工作。 6. **版本更新**：由于E-EDID标准可能会有更新，验证指南也会随之更新，以确保最新的功能和修正被正确实现。 7. **测试流程**：提供了详细的测试步骤和预期结果，帮助制造商和测试人员进行系统的合规性验证。 8. **错误修复建议**：如果发现不合规的情况，指南会提供可能的解决方案或修复建议，以帮助制造商改进产品。这份E-EDID验证指南对于保证显示器市场的质量和一致性起到了关键作用，确保了消费者能够无缝连接并使用各种显示器设备。对于开发人员、测试工程师以及对显示技术感兴趣的个人来说，这份文档是理解E-EDID标准和实施兼容性测试的重要参考资料。

VESA E-EDID Verification Guide Release A

3.2.4 Test for a Valid Week and Year of Manufacture or Model Year: 2 Bytes

There are two definitions for this data field: Week & Year of Manufacture or Model Year.

The week of manufacture field is optional, but the year of manufacture (or model year) field is required

in EDID structure version 1, revision 4. The week of manufacture field (if used) is set to a value in the

range of 1-54 weeks. If the week of manufacture field is not used, the value shall be set to ‘00h’.

The year of manufacture field is used to represent the year of the display’s manufacture or the model

year. If the year of manufacture field is used to represent the model year, then set the week of

manufacture (at address 10h) to ‘FFh’. Then enter the model year (at address 11h). The value that is

stored is an offset from the year 1990 as derived from the following equation:

Stored Value = (Year of Manufacture {or Model Year} - 1990)

Table 3-10 contains the definition for the Week & Year of Manufacture or Model Year. The test for a

valid Week & Year of Manufacture or Model Year Code is shown in Table 3.11. For more information

on the Week & Year of Manufacture or Model Year refer to section 3.4.4 in the E-EDID Standard

Release A, Revision 2.

Table 3-4: Week & Year of Manufacture or Model Year Definition

Address 2 Bytes Value Description

00h Week of Manufacture is not specified

01h → 36h Week of Manufacture is specified (range is 1 → 54 weeks)

37h → FEh Reserved: Do not use

10h

FFh

Model Year Flag --- Model Year is specified at address 11h

00h → 0Fh Reserved: Do not use

10h → FFh

If Byte 10h = FFh then Byte 11h contains Model Year

11h

10h → FFh

If Byte 10h ≠ FFh then Byte 11h contains Year of

Manufacture

Pre-Test Requirements: The tester shall make note of the week (if used) and the year of manufacture or

the model year of the display (or sink device). The week and year of manufacture of the display (or sink

device) may be shown on a label located on the rear of the display product or located in a manufacturer’s

data base. The model year may be shown on a label located on the rear of the display product or located

in a manufacturer’s data base or listed in the manufacturer’s product specifications. The tester should

record the Week of Manufacture (or Model Year Flag) and the Year of Manufacture (or Model Year) in

the Verification Test Report Form. The tester converts the Week of Manufacture (or Model Year Flag)

and the Year of Manufacture (or Model Year) into the 2 byte code. Both the decimal numbers and the 2

byte codes for the Week of Manufacture (or Model Year Flag) and the Year of Manufacture (or Model

Year) should be recorded in the Verification Test Report Form.

VESA E-EDID Verification Guide Release A

Table 3-5: Test Case 5: Week & Year of Manufacture or Model Year

Addresses

Test Case

Action Result Pass/Fail

If ‘Yes’, then Pass ---

continue to test case 5-2.

10h

5-1

Read & record the

data stored at

address 10h.

Is the data stored at address 10h

equal to zero or the week of

manufacture (in the range of 01h →

36h) or FFh?

If ‘No’, then Fail ---

Stop, Repair & Re-test

If ‘Yes’, then Pass ---

continue to test case 5-3.

5-2

If the data stored at address 10h is

not equal to FFh, then is the data

stored at address 11h equal to the

year of manufacture (in the range of

10h → FFh)?

If ‘No’, then Fail ---

Stop, Repair & Re-test

If ‘Yes’, then Pass ---

continue to test case 6-1.

11h

5-3

Read & record the

data stored at

address 11h.

If the data stored at address 10h is

equal to FFh, then is the data stored

at address 11h equal to the model

year (in the range of 10h → FFh)?

If ‘No’, then Fail ---

Stop, Repair & Re-test

3.3 Test for a Valid EDID Structure Version & Revision Numbers: 2 Bytes

The EDID Structure Version Number and Revision Number fields are required ELEMENTS in EDID

structure version 1, revision 4. These values define the EDID data structure being used. Display products

compliant with the E-EDID Standard, Release A, Revision 2 shall have the Version Number = 1 and the

Revision Number = 4. Table 3-12 contains the definition for the EDID Structure Version and Revision

Number. There are no pre-test requirements for the EDID Structure Version and Revision Number test

case. The test for a valid EDID Structure Version and Revision Number is shown in Table 3.13. For

more information on the EDID Structure Version Number & Revision refer to section 3.5 in the E-EDID

Standard Release A, Revision 2.

Table 3-6: EDID Structure Version and Revision Number Definition

Address 2 Bytes Value Description

01h EDID Structure Version Number 1

12h

00h, 02h → FFh Reserved: Do not use

04h EDID Structure Revision Number 4

13h

00h → 03h, 05h → FFh Reserved: Do not use

Pre-Test Requirements:

None.

Table 3-7: Test Case 6: EDID Structure Version and Revision Numbers

Address

Test Case

Action Result Pass/Fail

If ‘Yes’, then Pass ---

continue to test case 6-2.

12h

6-1

Read & record the

version number data

stored at address 12h.

Is the version number stored at

address 12h = one?

If ‘No’, then Fail ---

Stop, Repair & Re-test

If ‘Yes’, then Pass ---

continue to test case 7-1.

13h

6-2

Read & record the

revision number data

stored at address 13h.

Is the revision number stored at

address 13h = four?

If ‘No’, then Fail ---

Stop, Repair & Re-test

VESA E-EDID Verification Guide Release A

Table 3-9: Video Input Definition

Address Bit Definitions Description

7 _ _

_ _ _ _ Video Signal Interface: Bit 7

_ _

_ _ _ _

Input is an Analog Video Signal Interface:

7 6 5

_ _ _ _ _

Signal Level Standard: Video : Sync : Total Bits 6 & 5

0 0 0 _ _ _ _ _ 0.700 : 0.300 : 1.000 V p-p

0 0 1 _ _ _ _ _ 0.714 : 0.286 : 1.000 V p-p

0 1 0 _ _ _ _ _ 1.000 : 0.400 : 1.400 V p-p

0 1 1 _ _ _ _ _ 0.700 : 0.000 : 0.700 V p-p

7 _ _ 4

_ _ _ _

Video Setup: Bit 4

_ _

0 _ _ _ _ Video Setup: Blank Level = Black Level

_ _

1 _ _ _ _ Video Setup: Blank-to-Black setup or pedestal (see Note 1)

7 _ _

3 2 1

Synchronization Types: Bits 3 → 1

_ _

_ 0 _ _ _ Separate Sync H & V Signals are not supported

_ _

_ 1 _ _ _ Separate Sync H & V Signals are supported

_ _

_ _ 0 _ _ Composite Sync Signal on Horizontal is not supported

_ _

_ _ 1 _ _ Composite Sync Signal on Horizontal is supported

_ _

_ _ _ 0 _ Composite Sync Signal on Green Video is not supported

_ _

_ _ _ 1 _ Composite Sync Signal on Green Video is supported

7 _ _

_ _ _ _

0 Serrations: Bit 0

_ _

_ _ _ _ 0 Serration on the Vertical Sync is not supported

14h

_ _

_ _ _ _

1 Serration on the Vertical Sync is supported (see Note 2)

7 _ _

_ _ _ _ Video Signal Interface: Bit 7

_ _

_ _ _ _

Input is a Digital Video Signal Interface: (see Note 3)

7 6 5 4 _ _ _ _ Color Bit Depth: Bits 6 → 4

1 0 0 0

_ _ _ _

Color Bit Depth is undefined

1 0 0 1

_ _ _ _

6 Bits per Primary Color

1 0 1 0

_ _ _ _

8 Bits per Primary Color

1 0 1 1

_ _ _ _

10 Bits per Primary Color

1 1 0 0

_ _ _ _

12 Bits per Primary Color

1 1 0 1

_ _ _ _

14 Bits per Primary Color

1 1 1 0

_ _ _ _

16 Bits per Primary Color

1 1 1 1 _ _ _ _ Reserved (Do Not Use)

7 _ _

3 2 1 0 Digital Video Interface Standard Supported: Bits 3 → 0

_ _

_ 0 0 0 0 Digital Interface is not defined (see Note 4)

_ _

_ 0 0 0 1 DVI is supported

_ _

_ 0 0 1 0 HDMI-a is supported

_ _

_ 0 0 1 1 HDMI-b is supported

_ _

_ 0 1 0 0 MDDI is supported

_ _

_ 0 1 0 1 DisplayPort is supported

14h

_ _

→ → → → All remaining values for Bits 3 → 0 are Reserved: Do Not Use

Pre-Test Requirements: The tester shall review the display (or sink device) product specifications and

make note of the Video Signal Interface Type (analog or digital). If the Video Signal Interface Type is

analog, then the tester shall make note of the Signal Level Standard, the Video Setup, the

Synchronization Types and Serrations support. If the Video Signal Interface Type is digital, then the

tester shall make note of the Color Bit Depth and the Digital Video Interface Standard supported. The

tester should record this information in the Verification Test Report Form. The tester should also convert

this information into the bit data definitions for the byte at address 14h. If Analog Video Input is

supported, then the tester should run test cases 7-1 to 7-6. If Digital Video Input is supported, then the

tester should run test cases 7-7 to 7-9.

VESA E-EDID Verification Guide Release A

Table 3-10: Test Case 7- Video Input Definition

Address

Test Case

Action Result Pass/Fail

If ‘Yes’, then Pass ---

continue to test case 7-2.

7-1

If bit 7 at address 14h is equal to zero, then

is the analog video input port active?

If ‘No’, then Fail ---

Stop, Repair & Re-test

If ‘Yes’, then Pass ---

continue to test case 7-3.

7-2

If bit 7 at address 14h is equal to zero then

does the data stored at bits 6 & 5 (at address

14h) define the correct signal level

standard?

If ‘No’, then Fail ---

Stop, Repair & Re-test

If ‘Yes’, then Pass ---

continue to test case 7-4.

7-3

If bit 7 at address 14h is equal to zero then

does the data stored at bit 4 (at address 14h)

define the correct video setup?

If ‘No’, then Fail ---

Stop, Repair & Re-test

If ‘Yes’, then Pass ---

continue to test case 7-5.

7-4

If bit 7 at address 14h is equal to zero then

does the data stored at bits 3 → 1 (at

address 14h) define the correct

synchronization type?

If ‘No’, then Fail ---

Stop, Repair & Re-test

If ‘Yes’, then Pass ---

continue to test case 7-6.

7-5

If bits 7 & 0 at address 14h are equal to

zero, then does the display not support

serrations on the vertical sync?

If ‘No’, then Fail ---

Stop, Repair & Re-test

If ‘Yes’, then Pass ---

continue to test case 7-7.

7-6

If bit 7 at address 14h is equal to zero,

AND if bit 0 at address 14h is equal to one

then does the display support serrations on

the vertical sync?

If ‘No’, then Fail ---

Stop, Repair & Re-test

If ‘Yes’, then Pass ---

continue to test case 7-8.

7-7

If bit 7 at address 14h is equal to one then is

the digital video input port active?

If ‘No’, then Fail ---

Stop, Repair & Re-test

If ‘Yes’, then Pass ---

continue to test case 7-9.

7-8

If bit 7 at address 14h is equal to one then

does the data stored at bits 6 → 4 (at

address 14h) define the correct color bit

depth or is the color bit depth undefined?

If ‘No’, then Fail ---

Stop, Repair & Re-test

If ‘Yes’, then Pass ---

continue to test case 8-1.

14h

7-9

Read &

record the

data stored at

address 14h.

If bit 7 at address 14h is equal to one, then

does the data stored at bits 3 → 0 (at

address 14h) define the correct digital

interface standard supported or is the digital

interface not defined?

If ‘No’, then Fail ---

Stop, Repair & Re-test

3.4.2 Test for a Valid Horizontal and Vertical Screen Size or Aspect Ratio: 2 Bytes

The Horizontal and Vertical Screen Size or Aspect Ratio parameter fields are required ELEMENTS in

EDID structure version 1, revision 4 for all display products except for certain types of projectors. The

horizontal and vertical screen size parameters provide information on the screen dimensions of the

display device, rounded to the nearest centimeter (cm). These 2 bytes may also be defined as aspect ratio

in the ‘Landscape’ or ‘Portrait’ screen orientation mode. Aspect ratios are rounded to the hundredth

decimal place.

The host (source) is expected to use this data to get a rough idea of the image size to generate properly

scaled text and icons.

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