Kontron KTT20-pITX - Manual (Page 16)

KTD-S0045-D Page 12 VESA® DisplayIDTM
KTT20/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 0x00, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x00. 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
0x00 Product Identification Data Block (Vendor ID, Product Code, Manufacturing Date ...)
0x03 Type I Detailed Timing Data Block (Pixel Clock, Horizontal/Vertical Data ...)
0x0C Display Device Data Block (Device Technology, Operating Mode, Color Depth ...)
0x0D Interface Power Sequencing Data Block (Power On/Off Timing)
0x0F 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 KTT20/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)