ROI Series Mini-Converter v1.5r1 7
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Pixel rates are limited to a 165MHz maximum rate.
Pixel Clock Rate
ROI-DVI, ROI-DP, ROI-HDMI
The source video pixel clock is a combination of the video resolution and its
vertical rate. Some sources can generate pixel clock rates that exceed the
capabilities of the ROI-DVI, ROI-DP, and ROI-HDMI converters. It may not be
obvious what the resulting pixel clock will be for a particular resolution or vertical
rate.
For example, when a downstream sink device is connected to the ROI output
monitor connector, the source and sink could potentially negotiate a display
format (using EDID) that is beyond the capability of ROI’s video processing
circuitry.
When this error occurs, an “Exceeds max rate” red error message will be displayed
on the Mini-Config user interface, and the ROI will generate a full screen red
matte on the SDI output. A downstream DVI/DP/HDMI/SDI monitor will still
display the incoming video.
Possible solutions include:
• Disconnect the downstream device (for example, a computer monitor) from
the ROI. Once disconnected, ROI will negotiate directly with the source to
generate a video resolution that is within the ROI’s processing capability.
• Reconfigure the source signal to a resolution that ROI supports.
• On ROI-DP models, from the Genlock Screen, select ROI-DP from the EDID
Flow Through control so that the upstream source sees only the EDID of the
ROI (see
"EDID Flow Through" on page 33
).
ROI Processing Capabilities
The ROI models utilize a powerful scaling processor, however, some specific
combinations of input and output ROI selections, de-interlacing, and 180°
rotations or flips can exceed the processing capacity of the ROI Mini-Converters.
In these cases, a “Processing Limit Exceeded” red error message is displayed on
the Mini-Config user interface, and the ROI will automatically turn off certain
features in order to process the picture. These features that have been turned
off will be reported and will be in red. For an example, see
Possible solutions include:
• Reduce the size of the Region of Interest selections; input ROI, output ROI, or a
combination of both.
• Turn off 180 degree rotation and/or H and V flips, or frame delay.
• Use a progressive rather than interlace input signal.
Mini-Config Overview
Using AJA’s Mini-Config application, you can set up and control region-of-interest
and output display scaling operations, route audio, and configure genlock. Mini-
Config is also used to update the Mini-Converter firmware.
