W2642A Datasheet, PDF (2/8 Pages) Agilent(Hewlett-Packard) – DisplayPort AUX Channel Controller

Stand alone AUX channel control
A standard process to ascertain the
functionality of any DisplayPort device
is to see if you can communicate with
it through the standard interface, the
AUX channel. With a PC as the host,
a graphical user interface (GUI) is used
to control the W2642A through a LAN
connection. Through this GUI, you can
check the operation of a DisplayPort
source or sink over the AUX channel.
Setup Screen
Source testing
Figure 2 shows the setup screen
configured for testing a source. Note
that the W2642A is set up as a sink.
The W2642A can initiate a source read
/write process by asserting a hot plug
event. This event can have varying
lengths. Some events can be specified
as within the range to be interpreted
as an interrupt, while others can be
outside this range. You can use this
feature to check the source driver
interpretation of the event.
The W2642A can appear as any
sink device by merely loading in that
device’s EDID file. You can acquire
that file by connecting to the device,
configuring the W2642A as a source
and downloading the sink’s EDID
data. By using many different sets of
valid EDIDs, you can check the default
setup of a source as a function of the
parameters read from the EDID, such
as timing information or resolution.
Figure 2: Setup screen for the W2642A GUI for source test.
EDID Load
Figure 3: EDID tab screen for the W2642A GUI
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