Technical data

234 Agilent U7232A DisplayPort Electrical Performance Compliance Test Application
A DisplayPort Source Automated Test with W2642A DPTC
Aux Channel and Hot Plug Detect (HPD)
DisplayPort devices communicate with each other through the aux channel.
The DisplayPort sink device provides memory where a source and a sink
could read/write into this memory. DisplayPort Standard 1.1a has
reserved a set of DCPD registers for the purpose of test automation.
There is a HPD line between a source and a sink too. For automation
purpose, the HPD pulse is used as an IRQ to notify the source about a
test automated request.
Figure 99 Communication between the Source Device and Sink Device