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TFP410 output not recognized by some devices

Robert Sefton
Prodigy 80 points
Other Parts Discussed in Thread: TFP410

This is a camera system where raw images are captured from a CMOS image sensor, buffered, converted to 24-bit RGB, and then output to a TFP410 DVI transmitter. Resolution is 800x600 @ 60fps (pixel clock = 40MHz).

When we drive a DVI monitor with the output of the TFP410 everything works fine. The monitor (we've tried several) syncs to the DVI input, recognizes the resolution and displays the video. However, in the normal system we need to transport the video a long distance and use a Gefen DVI to Ethernet extender. This Gefen box does not recognize the TFP410 output directly. But if we put a DVI splitter between the TFP410 and the Gefen box (splitter is Tripp-Lite B116-002A) then the Gefen box sees the DVI signal and works as expected. We also have a DVI to S-Video downconverter (Altona AT-HD530) that behaves the same as the Gefen box. It does not recognize the TFP410 output directly but works if the Tripp-Lite splitter is inserted in the path.

We would like to make both of these units (Gefen and Altona) work directly from the TFP410 output and eliminate the Tripp-Lite splitter. Can anyone comment on what the issue may be with the TFP410 output that is causing problems? Again, DVI monitors work fine with the TFP410 output, but the Gefen an Altona boxes do not.

Thanks,

Bob S.

  • 0
    Prodigy 80 points
    After searching this forum for other TFP410 posts I think I found our problem. We are not driving the +5V pin on our DVI output connector. We have been able to drive DVI monitors from the TFP410, but the two devices listed above that do not work actually have HDMI inputs and we've been using a DVI to HDMI cable to drive them. Apparently some/most HDMI devices expect +5V to be present in order to recognize that a source has been plugged in. We will give that a try.