Appendix A - Edid Programmer; Edid Overview - AMX Epica DGX 32 Instruction Manual

Appendix A – EDID Programmer
EDID Programmer software is provided for re-programming the EDID EEPROM chips on
Epica DGX 32 DVI Input Boards if necessary. This software is available on the AMX AutoPatch CD
or at www.amx.com.

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:
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 (which requires 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.
Matrix Switchers and EDID
Matrix switchers, such as the Epica DGX 32, provide the ability to route one source signal to many
potentially different types of display devices. As long as the source signal being routed is supported
by all of the display devices, the result would be a good image on each display. If the source signal
being routed is not supported by a display device, the result would be either a badly distorted image or
no image at all.
To address these issues, the DGX DVI Board comes with one EDID EEPROM chip per input connector,
which has been pre-loaded with an AMX AutoPatch EDID set. This EDID set consists of some of the
most common EDID settings in use today, including VESA and HDTV settings encompassing 8
resolutions with Standard Timings and 4 resolutions in 12 formats for Established Timings (for timing
details, see page 52). In many cases, the matrix switcher can be used straight out of the box with no
adjustments
(see "Determining the Need for EDID Programming" on page 104).
The EDID Programmer software has been provided for cases where additional in-field programming of
the EDID chips is needed. The Programmer can be used for the following:
Important: Any analysis or editing of the EDID data necessary to support the equipment specific to
your installation will need to be done separately prior to using the EDID Programmer. A variety of
freeware tools can be found on the web to help with these tasks.
Epica DGX 32 Instruction Manual
Manufacturer's name
Product type
Supported video resolutions and refresh rates
Color space and filter chromaticity
Detailed timings
Reading and saving EDID data from a device
Writing EDID data to an AMX AutoPatch matrix switcher's input connector's associated
EDID EEPROM
Appendix A – EDID Programmer
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