Edid Programmer View - AMX DGX1600-ENC Hardware Reference Manual

EDID Programmer View

From the EDID Programmer view, EDID EEPROM chips on each of the DGX HDMI and DGX DVI Input Board connectors can be
re-programmed independently if necessary.
EDID Overview
EDID (Extended Display Identification Data) is a data structure established by the Video Electronics Standards Association (VESA)
to enable plug-and-play support by enabling easy configuration of a computer's graphics subsystem based on the capabilities of
the attached display device.
EDID information includes items such as the following:
Manufacturer's name

Product type

Supported video resolutions and refresh rates

Color space and filter chromaticity

Detailed timings

When a computer is directly connected to a display device, it can use the display device's EDID information to determine an initial
compatible video signal to send. With the computer's display controls, the user can modify this selection to another compatible
signal based on the provided EDID information.
With DVI and HDMI signals (both require EDID on the display devices), using EDID information has extended beyond computers to
other source devices, such as DVD players. As long as the source device sends a compatible signal, the plug-and-play feature will
work.
Digital Media Switchers and EDID
Digital Media Switchers, such as the Enova DGX, provide the ability to route one source signal to many potentially different types of
display devices. In almost all cases through the use of compatible DXLink Receivers (featuring SmartScale Technology),
incompatibilities between source device resolutions and displays are automatically resolved as each receiver independently scales
each source device's video to the display's native resolution.
In cases where local DVI or HDMI outputs are used and a resolution incompatibility exists (or if a source device needs a specific
resolution), the DGX DVI and DGX HDMI Input Boards have the ability to update the EDID emulation file (by updating each input's
EEPROM chip) which comes pre-loaded with an EDID set.
This EDID set consists of some of the most common EDID settings in use today, including VESA and HDTV settings encompassing
resolutions for Standard Timings and resolutions for Established Timings (for HDMI timing details, see page 66; for DVI, see
page 77). In many cases, the switcher can be used straight out of the box with no adjustments (see "Determining the Need for
EDID Re-programming" on page 278).
The DGX Configuration Software with EDID programming functionality has been provided for cases where additional in-field
programming of a board's input connectors EDID chips is needed. The EDID Programmer view can be used for the following:
Reading and saving EDID data in hexadecimal from an output receiving the information from its attached destination device

Writing EDID data to the Enova DGX input connector's associated EDID EEPROM

IMPORTANT: Any analysis or editing of the EDID data necessary to support the equipment specific to the installation will need to be
done separately prior to using the EDID Programmer view. A variety of freeware tools can be found on the Internet to help with these
tasks.
Keep in mind that the EDID information for some equipment may not be compatible with the remaining equipment even with
re-programming. In those cases, the signals will have limited routing options.
TIP: If the signal from some of the equipment can only be routed to part of the destinations due to incompatible EDIDs, control can
be simplified by creating a separate virtual matrix for the inputs and outputs involved (see "Creating a New Virtual Matrix" in the
XNConnect Help file).
The remaining sections for the EDID Programmer view provide information on:
Determining the need for EDID re-programming

Reading and saving EDID data from an output, which received the information from its attached destination device

Writing data to an Enova DGX input connector

Additional HDMI EDID files for handling audio concerns

Determining the Need for EDID Re-programming
Ideally EDID analysis will have been completed during installation specification. Consideration should be given to the use of DXLink
Output Boards and corresponding DXLink Receivers which (in almost every case) will remedy incompatible source and destination
resolution issues. If EDID analysis was not possible but all of the system's devices are now available, the most effective way to
proceed is to test if the signal from each source device can be routed through the Enova DGX Switcher to each of the destination
devices. If they can be routed, then EDID re-programming is not necessary.
A method of control is not specified in the following instructions. Any board you think might need EDID re-programming must have
the destination devices (and modules if applicable) attached before completing the following procedure.
Hardware Reference Manual – Enova DGX 100 Series Digital Media Switchers
Appendix F – DGX Configuration Software
278