Hot Plug Detect - 3.2 English

HDMI 1.4/2.0 Transmitter Subsystem Product Guide (PG235)

Document ID
PG235
Release Date
2024-12-11
Version
3.2 English

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 an HDMI cable is inserted between the HDMI source and sink devices, the HPD signal is asserted, which triggers the subsystem to start communicating with the sink device.

Important: The HPD from HDMI Sink 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.