Kontron KTLX800-pITX User Manual download pdf (Page 10)

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

Specification (VESA)

Intended as a replacement for all previous EDID versions DisplayID

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

Parameter Summary

Only a part of the parameters used in the DisplayID

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

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 36 37

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