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Video pattern mode using DisplayPort on DLP 6500 EVM

David Shirvanyants
Prodigy 30 points
Other Parts Discussed in Thread: DLPC900

I am trying to display a high frame-rate video on a DLP 6500 using video pattern mode. I have found that in order to switch to the Video Pattern mode, I need to follow this protocol:

1. Switch to the Video mode.

2. Wait till the receiver is locked to the external source.

3. Switch to the Video Pattern mode.

This method works well when using primary HDMI input. However, I was unable to have the receiver to lock to the video source when using the secondary DP input.

Below are the screenshots of the GUI window showing my settings.

What should I do in order to get Video Pattern mode to work with the DisplayPort input?

HDMI input

DisplayPort input

Thank you,

David

  • 0
    TI__Prodigy 210 points

    Hello David, thank you for your question. I've noticed in the second image within the Port Config Controls you have selected Port 2 for all four inputs.

    Please select Port 1 as in the first image. If your frame rate of your source is 120Hz, then select Dual Pixel for the Pixel Mode, otherwise select

    Single Pixel for 60Hz. How to determine when you should select between Single Pixel and Dual Pixel depends on the pixel clock of the source.

    The DLPC900 datasheet shows a maximum pixel clock for Single Pixel is 175MHz, and for Dual Pixel is 141MHz. So as you increase the frame rate

    in Single Pixel mode, you will need to switch to Dual Pixel mode once you exceed 175MHz.

    When switching to Display Port, set the Display Port first followed by setting the Port Config Controls.

    Let us know if you have any questions.

    Regards,
    Jaime

  • 0 in reply to Jaime Longoria
    Prodigy 30 points
    Hello Jaime,
    Thank you for the prompt response.

    You were right, after I selected DisplayPort on the receiver and Port 1 for sync and data, the receiver was able to lock.

    Do I understand it correctly, that port id is logical, not physical, and whichever connector is selected in the receiver configuration will become Port 1? And the other connector will become Port 2?

    Thank you,
    David
  • 0 in reply to David Shirvanyants
    TI__Prodigy 210 points

    David, I'm glad to hear it is working now.

    The IT6535 receiver has 2 inputs and 1 output. You select the input using the GUI selection HDMI or Display Port. The output connects to port 1 of the DLPC900.

    The DLPC900 digital controller has two physical ports; port 1 and port 2. The EVM has been routed in such a way that you will select port 1 for data port, H&V syncs, data enable, and pixel clock for both HDMI and Display Port. You will select single pixel or dual pixel as I mentioned in previous post.

    Once you design your own PCB, you can choose how to route your signals and which port you want to use - selecting one port verses another may give you a little flexibility when routing signals.

    Regards,

    Jaime