W2642A Datasheet, PDF (3/8 Pages) Agilent(Hewlett-Packard) – DisplayPort AUX Channel Controller

The W2642A can provide any DPCD
data desired by merely loading from a
DPCD file that has acceptable data or
by creating that data independently.
Standard DPCD data can be acquired
from a device by connecting to it and
configuring the W2642A as a source
and downloading its DPCD data, or by
writing to it directly using the DPCD IO
capabilities shown in Figure 4.
DPCD Data Load
Figure 4: DPCD tab screen for the W2642A GUI
Sink testing
Figure 5 shows the setup screen
configured for testing a sink. Note that
the W2642A is set up as a source.
Setup Screen
The W2642A configured as a source
can read/write EDID or DPCD. In this
mode, data that is read from the sink
device can be compared with expected
behavior, for example, symbol lock.
This is particularly convenient for
testing jitter tolerance on a sink or
verifying that the sink state registers
are operating as expected. When the
W2642A is acting as a source, the
EDID and DPCD screens are identical
as in Figures 4 and 5 and represent
actual data state of the sink device
being tested when the “Read from DP
function” is enabled.
In any verification process you must
Figure 5: Setup screen on the W2642A GUI configured for sink test.
verify the EDID content and i2c over
AUX communication using the source
reading of EDID. You can verify whether
your sink device works in either EDID
communication method as stipulated
in the DisplayPort standard using the
Method 1 or Method 2 selection in the
Setup tab.
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