About Edid Memory; Edid Types - Lightware UMX4x4-Pro2 User Manual

5.3.

About EDID memory

EDID memory is non-volatile and consists of four blocks, each for different purpose.
These blocks are:
EDIDs are numbered from 1 in each block, and they can be referred as the first letter of
the block name, and the number of the desired EDID. This way F02 refers to the second
factory preset EDID, and D04 refers to the display device's EDID on output 4.
The memory structure is as follows:
All EDIDs (including factory preset; user programmable memories; EDID at other inputs;
and EDID at outputs) can be switched and emulated at any of the inputs.
Info: The factory EDIDs (Fxx) are factory preprogrammed and cannot be modified. These are
the most commonly used resolutions.
Info: UMX4x4-Pro2 matrix switcher can handle both 128 Byte EDID and 256 Byte extended
EDID structures.
The attached monitor's EDID is stored automatically, until a new monitor is attached to
Info:
that particular output. In case of powering the unit off, the last attached monitor's EDID
remains in non-volatile memory even is the monitor is unconnected.

5.3.1. EDID types

Most of the factory preset EDIDs include only one resolution. This is to force the
connected source to give a signal with the needed resolution. However there are
Universal EDIDs as well which allow many resolutions.
The factory EDIDs are divided into groups regarding their type. Some EDIDs are
supporting DVI only, some support HDMI, and some are for analog VGA signals.
Analog EDIDs can be used for input ports which have a VGA (RGBHV) source.
DVI EDIDs does not support audio. The Universal DVI EDID indicates support for many
PC resolutions.
HDMI EDIDs support embedded LPCM audio.
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
Factory preset EDIDs

User saved EDIDs

Dynamic EDIDs (EDID of last connected sink on a specific output port)

Emulated EDIDs (EDID currently emulated on a specific input port).
F01..F99 ............................................................. Factory Preset EDIDs
U01..U50 ............................................... User programmable memories
D01..D04 ............................ Last attached monitor's EDIDs (on outputs)
E01..E04 .................................................... Emulated EDIDs (on inputs)
Section 5. Operation