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SN75DP139 4K operation

u han
Prodigy 210 points
Other Parts Discussed in Thread: SN75DP139

Hi, SN75DP139 datasheet has listed 4k x 2k (30Hz, 24 bpp) in the Features list. Does it really work  at 4k x 2k (30Hz)?

Please verify. Thanks.

  • 0
    TI__Mastermind 36085 points

    Hello,

        Yes it does.

    Regards,

    Diego.

  • 0 in reply to Diego Cortes
    Prodigy 210 points

    Hi Diego,

    Thanks for the reply. What kind of DisplayPort ++ (dual mode) source do you use for 4K? Can you name the graphic card or configuration for source? I am trying with most of the cards and PC/laptops/Macs currently result is only 1080p highest. Thanks.

  • 0 in reply to u han
    TI__Mastermind 36085 points

    Hello,

        We do not have information regarding an specific 4K source, all the tests for this device were done by means of a general purpose generator/analyzer (ParBERT). However you can try with AMD/GEFORCE graphics cards, I am pretty sure they have products supporting 4K resolution.  

    Best regards,

    Diego.

  • 0 in reply to Diego Cortes
    Prodigy 210 points

    I have tested with AMD graphic cards including latest chipset which support 4K. I have tested with various PCs and Mac which supports 4K resolution on DP. Only got 1080P came out with this chip.

    This chip can go up to 3.4Ghz when testing with (BERT). I agree with Diego. I have tested myself.

    But it can not send the correct signal from DDC line to the DP++ source to pass the 4K, 30 Hz resolution.

    I believe the TMDS connector identification LOGIC BLOCK in this chip is only good for 1080p. Can you please check with factory and confirm?

    BR,

  • 0 in reply to u han
    TI__Mastermind 36085 points

    Hello,

       I will confirm with the design team. In the mean time, Could you confirm tthe status of I2C_EN and DDC_EN?

    Best regards,

    Diego.

  • 0 in reply to Diego Cortes
    Prodigy 210 points

    Hi,

    I2C_EN and DDC_EN are set to high (4.7K pull up resistors to +3.3V).

    BR,

  • 0 in reply to u han
    TI__Intellectual 1800 points

    DP139 is a Dual Mode Type 1 device.  VESA released a new Dual Mode standard and defined a new Dual mode type called Type 2.  According to this new standard,  a Type 2 device supports up to 300Mhz clock and a Type 1 device supports upto 165MHz clock.  If source software check for Type 2 in order to enable 4K2K video, then the DP139 will not work.  Even though DP139 supports 4k2k, it doesn't have the Type 2 identifier and source will not enable higher than 168MHz.