Miscellaneous Signals with AXI4-Stream Video Interface - 3.1 English

HDMI 1.4/2.0 Receiver Subsystem Product Guide (PG236)
Document ID
PG236
Release Date
2020-12-11
Version
3.1 English

The following table shows the miscellaneous signals with AXI4-Stream video interface selected.

Table 1. Miscellaneous Signals
Name I/O Width Description
hpd O 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.
video_clk I 1

Reference Native Video Clock

When AXI4-Stream is selected as Video Interface, a Video In to AXI4-Stream Bridge module is added to the HDMI RX Subsystem to convert Native Video into AXI4-Stream Video. HDMI RX core uses this video_clk to clock out the video data.
SB_STATUS_IN_tdata I 2

Side Band Status input signals

  • Bit 0: link_rdy
  • Bit 1: video_rdy
SB_STATUS_IN_tvalid I 1 Side Band Status input valid
fid I 1

Field ID for AXI4-Stream bus. Used only for interlaced video.

  • 0 - even field
  • 1 - odd field

For progress video the output is always Low.

  1. 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. When designing an HDMI sink system using the HDMI 1.4/2.0 RX 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 the HDMI 1.4/2.0 RX 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 .
  2. The Cable Detect signal is connected to a 5V power signal from the HDMI cable connector via some level shifter to notify the HDMI 1.4/2.0 RX Subsystem that an HDMI source is connected.