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TFP410 - Video Display Problem

Kawai
Guru 19785 points
Other Parts Discussed in Thread: TFP410

Our customer observed the following symptom.

They have 1080p60 video output to a monitor, it will not show all picture.
The bottom 10 or more horizontal line shows black when connected to a certain monitor.
Customer asks us why this symptom occurs.

They understand that there is an errata of H_RES count < 2047. So they set the registers as the below. *

  DE_DLY： 127
  DE_CNT：1920
  DE_TOP：　41
  DE_LIN：1080

 * HV total and HV active range are,
      H-Total: 2200
      H-Active: 1920
      V-Total: 1125
      V-Active: 1080
      Pixel Freq: 148.5MHz (Vfreq: 60Hz)

But they are setting as the below because of the errata.

  H-Total: 2047
  H-Active: 1920
  V-Total: 1125
  V-Active: 1080
  Pixel Freq: 148.5MHz (Vfreq: 60Hz)

 [Question]
Why does this happen ?

 [Question]
When setting as the above, is there NO "DE" signal under DE_LIN=1080(Active Video) ?

Best Regards,
Kawai

  • 0
    TI__Guru* 76130 points

    Hello Kawai,

    We are trying to replicate this issue.

    Please provide the register values they read from sub-addresses 0x32 to 0x3C.

    Please send a picture of the panel/screen when the issue is present.

    Does a power cycle fixes the issue?

    Can they try with different clock frequencies?

    can you provide more specifications about the DVI receiver?

    Regards.

  • 0 in reply to Elias Villegas M.
    Guru 19785 points

    Hi Elias-san,

    Thank you for your support.

    I am collecting information from customer.

    Best Regards,
    Kawai

  • 0 in reply to Kawai
    Guru 19785 points

    Hi Elias-san,

    This question had been closed. (Project pending)

    The symptom seemed to occur depending on how the display(monitor) recognize the input video format, as TFP410 has errata to H_RES count limitation.

    * I asked for detail data but customer did not have detail data, only tested if the video showed correctly on the display or not.

    Thanks and Best Regards,
    Kawai