10
Chapter 1
5. VESA DDC
The VGA/ DVI/ HDMI inputs will be capable of continuously transmitting its Extended Display Indentification
(EDID) information using Display Data Channel. It will automatically switch to DDC2 mode if a DDC2 capable host
is detected in accordance with the VESA DDC standard.
In addition, the display can respond to a request for EDID, to be transmitted using DDC2, level B commands. If a
DDC2 capable host is detected by the display, the display will switch to DDC2 communication.
The EDID will contain the manufacture name code QCI, product code, date of manufacture, and serial number.
For complete EDID data structure, please refer to VESA Extended Display Identification Data Standard.
Hardware implementation will be either integrate into micro-controller or be a separate electrical component. EDID
memory will be protected against writing or other corruption through customer-accessible electrical connection and
required communication channels. Password protection, use of an unpublished enable register, or use of direct
electrical connection is acceptable levels of protection provided that the power-on Default State is that disabling
writing. The serial number fields in the EDID will contain a unique identifying numbers among units of the same
model. EDID table is defined as below.
5.1 For VGA Input
5.2 For HDMI Input (Optional)
Product
Revision
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
0 00 FF FF FF FF FF FF
00
04
72
02
32
00 00 00 00
1 2D DF 01 03 68
46
28
78
E8 DC 10 A2 58 45 9C 25
2 13 49 4B AF EE 00
31
40
45
40
61
40
00 00 00 00
3 00 00 00 00 00
00
69
21
50
B0
51
00
1B 30 40 70
4 36 00 02 90 31
00
00
1E
00
00
00 FD 00 32 55 1E
5 50 08 00 0A 20
20
20
20
20
20
00
00
00 FF 00 30
6 30 30 30 30 0A 20
20
20
20
20
20
20
00 00 00 FC
7 00 61 63 65 72
20
41
54
33
32
30
32 0A 20 00 5A
