I N T R O D U C T I O N
EDID Control
350-10035-01 v4.1.1
Linx DVI Matrix Switchers User’s Guide
5
RGB
The block diagram in Figure 1-1 illustrates the selection of EDID to be passed to the host
graphics adapter. The data is stored in the EDID register which can be read whether the
Linx
DVI Switcher
is powered on or off.
1.5.2
Hot Plug Event
When a display is connected to or disconnected from an output port, a
hot plug
event occurs.
If the unit is configured with EDID pass-through and input is set for Dynamic, the
Linx
Switcher
downloads the display's EDID parameters to the EDID register for the duration of
that connection. The source device reads the EDID from this register.
A
hot plug
event also occurs when a graphics source is connected to a
Linx Switcher
input
port. The
Linx Switcher
will continuously supply EDID to the graphics source even if the
Linx
Switcher
is powered off.
A Force Hot Plug command is available via the WCP or command line (
FORCEHotPlug
).
1.5.3
EDID Priority
When an input is routed to multiple outputs, a number of options are available. Fixed EDID
can be selected from the EDID list or a priority scheme may be used to select EDID from one
of the output ports. Priority is needed when the displays have different resolutions from one
another and can be set to select either the active output with the lowest resolution or the
lowest numbered active output. EDID priority is applied to Emulated and display pass-
through data. The input configuration must be set to Dynamic for the priority schemes to
work.
Instances where two or more displays’ resolutions are not compatible with each other may
occur. For these occasions, a lower “common-denominator” resolution or scaler will be
needed.
Only active outputs are considered when establishing priority. Active outputs are those
having parameters stored in the
Linx Switcher
EDID display register; these may be outputs
currently connected or those with assigned emulated EDID.
1.5.4
EDID List
The EDID list is used to apply parameters to the fixed and emulated EDID registers. User
entries in the list are numbered 1 to 100 with an additional factory default based on the Dell
2408 monitor (1920x1200 at 59.95 Hz). Data contained in the list include:
■
List index number
■
Name
■
Display device manufacturer’s ID
■
Resolution and frame rate
Advanced users may view and modify additional timing parameters with third-party software
such as Phoenix EDID Designer freeware available at
http://www.tucows.com/preview/329441
.