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DS90UH949-Q1: question about DS90UH949-Q1

Jimmy Huang
Expert 2705 points
Part Number: DS90UH949-Q1

Hello：

The customer used UH949's IC bist screen test, and during the screen switching process, white bars appeared. Do you have any ideas for this issue? Thank you！！！

  • 0
    TI__Mastermind 19550 points

    Hi Jimmy,

    To be clear on the error you are seeing, you are talking about the skinny white bar between the green and pink rectangle? It's a bit hard to see over video. Improperly programmed timing or PCLK skew can cause screen artefacts.

    What's the deserializer in this system? Does this occur on every system?

    Best,

    Jack

  • 0 in reply to Jack Scherlag
    Expert 2705 points

    Hello Jack：

    When switching quickly, there will be a white bar, as shown in the following figure, using UH948 and 949

    At present, the product is only being tested and has not been adapted to this screen on other systems. The only issue is that the microcontroller is driving the 949 to output a test screen

    Additionally, the customer would like to know if 949 can obtain the current output image frame rate when outsourcing test images? Is it from a register or something else? Thank you!!!

  • 0 in reply to Jimmy Huang
    TI__Mastermind 19550 points

    Hi Jimmy,

    The internal PATGEN function is a basic testing feature for displaying static images on the display. The artefacts between patterns are normal. If you need to test the display with dynamic images/videos, an HDMI source for the 949 is needed.

    Jimmy Huang said:

    Additionally, the customer would like to know if 949 can obtain the current output image frame rate when outsourcing test images? Is it from a register or something else? Thank you!!!

    There is no explicit register for frame rate. Frame rate is part of the PCLK calculation. To calculate frame rate, the PCLK and video timings are needed.

    PCLK = Horizontal total * Vertical total * Frame rate

    Frame rate = PCLK / (Horizontal total * Vertical total)

    Best,

    Jack