The subsystem supports the Hot Plug Detect (HPD) feature, which is a communication mechanism between the HDMI source and HDMI sink devices. For example, when you insert an HDMI cable between the HDMI source and sink devices, the HPD signal asserts, triggering the subsystem communication with the sink device.
Important: The
HDMI Sink HPD is at 5V. Therefore, a level shifter is required before
connecting it to the corresponding FPGA input pin in the HDMI 1.4/2.0 TX Subsystem design. For example, if the HPD pin of the HDMI 1.4/2.0 TX Subsystem is at 3.3V bank, a level shifter is required
to translate HPD signal from 5V to 3.3V.