Edid Memory (Transmitter); Edid Types - Lightware MODEX-OPTS-TX User Manual

4.3. EDID memory (transmitter)

EDID memory is non-volatile and consists of four blocks, each for different purposes:
EDIDs are numbered from 1 in each block. 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.
Dynamic and emulated EDID blocks' size depends on the A/V modules. EDID memory
structure is the following:
Dynamic, factory and user EDIDs can be switched and emulated at the input(s).
Info: Factory EDIDs (Fxx) are factory preprogrammed and cannot be modified. These are the
most commonly used resolutions.
Info: MODEX can handle both 128 Byte EDID and 256 Byte extended EDID structures.
Info: Attached monitor's EDID is stored automatically, until a new monitor is attached to that
particular output. In case of powering the unit off, last attached monitor's EDID remains in
non-volatile memory even if the monitor is disconnected.

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.
Factory EDIDs are divided into groups regarding their type. Some EDIDs support DVI only,
some support HDMI and some are for analog VGA signals. Also there are EDIDs for Dual
Link DVI resolutions.
DVI EDIDs does not support audio. Universal DVI EDID indicates support for many PC
(VESA) resolutions.
HDMI EDIDs support embedded audio. These EDIDs have PCM stereo audio format
enabled. To allow other audio formats like Dolby and DTS, special EDIDs have to be used.
There are three Universal HDMI EDIDs which include the same resolutions but support
different capabilities:
Info: Analog EDIDs are for future developments.
Dual Link DVI EDIDs does not support audio. Use only for Dual Link ports.
1
The exact EDID memory size depends on the firmware and the installed A/V modules.
Section 4. MODEX concept

Factory preset EDIDs

User-saved EDIDs

Dynamic EDID (EDID of last connected sink on the output port)

Emulated EDIDs (EDID currently emulated on a specific input port)

F01..F119 .................................................................. Factory Preset EDIDs

U01..U31 ..................................................... User programmable memories
Dxx .................................................. Last attached monitor's EDID (output)


Exx ........................................................................... Emulated EDID (input)
EDID
Universal_HDMI_PCM
Universal_HDMI_ALL
Universal_HDMI_DC
1
PCM audio
yes
yes
yes
Table 4-1. Universal HDMI EDIDs
MODEX-OPTS, MODEX-OPTM
User's Manual
other audio deep color
no no
yes no
yes yes
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