Xilinx HDMI 1.4, Product Manual

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HDMI 1.4/2.0 TX Subsystem 44
PG235 October 4, 2017 www.xilinx.com
Chapter 3: Designing with the Subsystem
VActive = 1080/2 = 540
Field Rate = 50Hz
Frame Rate = 50/2 = 25Hz
To design using the AXI4-Stream Interface, generate two fields of video with timing using
the values from Table 3-2 . For complete timing information, refer to CEA-861-F [Ref 28] .
Only active video data compliant with AXI4-Stream protocol is needed. The AXI4-Stream to
Video Out core inside HDMI 1.4/2.0 Transmitter Subsystem converts the AXI4-Stream video
into native video. Ensure that fid is driven to align with the field video data. For details, refer
to AXI4-Stream to Video Out LogiCORE IP Product Guide (PG044) [Ref 27] .
To design using the Native Interface, generate two fields native video with timing using the
values from Table 3-2 . Ensure that the HSYNC and VSYNC are driven using the values from
Table 3-2 . Since a frame may have odd number of lines (e.g. 1125 for 1080i50), the two
fields may result in a different total number of lines (e.g. Field 0 has 522 lines, and Field 1
has 523 lines).
Interlaced Video with Pixel Repetition
For some video formats with TMDS rates below 25 Mhz (e.g. 13.5 for 480i/NTSC) can be
transmitted using pixel-repetition scheme.
In the HDMI 1.4/2.0 Transmitter Subsystem,
• Pixel repetition of two is supported for NTSC/480i60 or PAL/576i50
• Enabled through GUI parameter upon IP generation
• Pixel repetition is only available for AXI4-Stream Interface
After it is enabled in the HDMI 1.4/2.0 Transmitter Subsystem, you must prepare interlaced
video as normal, then the HDMI 1.4/2.0 Transmitter Subsystem replicates each pixel twice
before sending the data out.
Because only NTSC/480i60 and PAL/576i50 are supported for pixel repetition, ensure that
the correct XVDIC from the Video Common library is selected:
• XVIDC_VM_1440x576_50_I => PAL/576i50
• XVIDC_VM_1440x480_60_I => NTSC/480i60
For example,
480i60 video is 720x480 @ 30Hz, which is made from two fields of 720x240 @ 30Hz video.
You must select XVIDC_VM_1440x480_60_I in the software. Then in the hardware system,
prepare two fields of 720x240 @ 30Hz video (AXI4-Stream Video) and send them to the
HDMI 1.4/2.0 Transmitter Subsystem. Then HDMI 1.4/2.0 Transmitter Subsystem repeats
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