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Section
4
.
Operation
4.3.
About EDID memory
EDID memory is non-volatile and consists of four blocks, each for different purpose. These
blocks are:
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).
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:
F01..F99 ............................................................. Factory Preset EDIDs
U01..U50 ............................................... User programmable memories
D01..D04 .................................
Last attached monitor’s EDIDs (outputs)
E01..E04 ......................................................... Emulated EDIDs (inputs)
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-Pro can handle both 128 Byte EDID and 256 Byte extended EDID structures.
Info:
The attached monitor’s EDID is stored automatically, until a new monitor is attached to 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.
4.3.1. 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 audio. These EDIDs indicate that any audio format is
accepted (PCM, Dolby, DTS, etc.). There are three Universal HDMI EDIDs which include
the same resolutions but support different capabilities.
EDID
PCM audio
other audio
deep color
Universal_HDMI_PCM
yes
no
no
Universal_HDMI_ALL
yes
yes
no
Universal_HDMI_DC
yes
yes
yes
