Miscellaneous Signals with Native Video Interface - 3.2 English

HDMI 1.4/2.0 Receiver Subsystem v3.2 Product Guide (PG236)

Document ID: PG236
Release Date: 2023-10-18
Version: 3.2 English

The following table shows the miscellaneous signals with native video interface selected.

Table 1. Miscellaneous Signals with Native Video Interface
Name	I/O	Width	Description
hpd	I	1	If XGUI option: Hot Plug Detect Active-High (Default) 0 - Hot Plug Detect is released 1 - Hot Plug Detect is asserted If XGUI option: Hot Plug Detect Active-Low ¹ 0 - Hot Plug Detect is asserted 1 - Hot Plug Detect is released
cable_detect	I	1	If XGUI option: Cable Detect Active-High (Default) 0 - Cable Detect is released 1 - Cable Detect is asserted If XGUI option: Cable Detect Active-Low ² 0 - Cable Detect is asserted 1 - Cable Detect is released
irq	O	1	Interrupt request for CPU. Active-High.
SB_STATUS_IN_tdata	I	8	Side Band Status input signals Bit 0: link_rdy Bit 1: video_rdy Bits [7:2]: Reserved
SB_STATUS_IN_tvalid	I	1	Side Band Status input valid
video_rst	O	1	Video reset signal in video_clk domain. Active-High.
The Hot Plug Detect (HPD) signal is driven by an HDMI sink and asserted when the HDMI cable is connected to notify the HDMI source of the presence of an HDMI sink. In most cases, the HDMI sink is simply connected to 5V power signal. Therefore, in the PCB, if you choose to use a voltage divider or level shifter, the HPD polarity remains as Active-High. However, if you add an inverter to the HPD signal, then the HPD polarity must be set to Active-Low in the HDMI 1.4/2.0 RX Subsystem GUI. When designing an HDMI sink system using HDMI Receiver Subsystem, in the PCB, if you choose to use a voltage level shifter, the HPD polarity remains as Active-High. However, if you choose to add an inverter to the HPD signal, then the HPD polarity must be set to Active-Low in HDMI Receiver Subsystem GUI. There are two common ways of using HPD: Toggle HPD to trigger HDCP authentication process (usually 100 ~ 500 ms). Or a longer HPD toggle (>1s), the HDMI sink is notifying the source its present without cable unplug and plug. The software API used to assert and release HPD is XV_HdmiRxSs_SetHpd. The Cable Detect signal is connected to a 5V power signal from the HDMI cable connector through some level shifter to notify the HDMI 1.4/2.0 RX Subsystem that an HDMI source is connected.