2 edid 1.3 specification (vesa), 3 displayid, Specification (vesa) – Kontron KTLX800-pITX User Manual
Page 10: Ktlx800/pitx software guide, 1 displayid, Parameter summary
KTD-S0023-A Page
7
Graphics
Interface
KTLX800/pITX Software Guide
3.2
EDID 1.3 Specification (VESA)
The EDID (Extended Display Identification Data) record has a fixed structure. The first 8 bytes contain the
distinctive identification 00h, FFh, FFh, FFh, FFh, FFh, FFh, 00h. The end of the record is marked by the
checksum (1 byte). The result of the addition of all bytes including the checksum has to be zero.
For a comprehensive support of the majority of available panels you don't need all fields of the EDID
record. The
Detailed Timing Descriptor (18 bytes) is the most important field. No 24bit panels (FPDI/LDI)
are supported though. This means EDID should only be used for 18bit panels.
For further information please consult the official EDID specification from the VESA comitee which has to be
payed.
3.3
DisplayID
TM
Specification (VESA)
Intended as a replacement for all previous EDID versions DisplayID
TM
contains many new features. It's a
structure with several well defined elements (tags). Not every element that is listed in the specification has
to be part of the resulting data set (basic section).
KONTRON has decided to use this selection of tags (mandatory presence).
Tag
Description
00h
Product Identification Data Block (Vendor ID, Product Code, Manufacturing Date ...)
03h
Type I Detailed Timing Data Block (Pixel Clock, Horizontal/Vertical Data ...)
0Ch
Display Device Data Block (Device Technology, Operating Mode, Color Depth ...)
0Dh
Interface Power Sequencing Data Block (Power On/Off Timing)
0Fh
Display Interface Data Block (Interface Type, Interface Attribute ...)
3.3.1 DisplayID
TM
Parameter Summary
Only a part of the parameters used in the DisplayID
TM
Windows
®
tool are interpreted by a specific board. The
following table shows a summary of the used parameters (
valid for KTLX800/pITX
).
Group
Parameter
Comment
Type I Timing
Pixel Clock
Type I Timing
Horizontal Active
Type I Timing
Horizontal Blank
Type I Timing
Horizontal Sync Offset
Front porch
Type I Timing
Horizontal Sync Width
Type I Timing
Vertical Active
Type I Timing
Vertical Blank
Type I Timing
Vertical Sync Offset
Front porch
Type I Timing
Vertical Sync Width
Display Interface 1
Bits per Pixel
Color depth (18 or 24bit)
Display Interface 1
24 Bit Color Mapping
Display Interface 2
Signal Polarity
Only H-Sync and V-Sync
Display Interface 2
DE Mode
Only Normal mode + Fixed mode low