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buffer for 24 bit digital video

kiruba sankar
Prodigy 190 points
Other Parts Discussed in Thread: TFP410, DS90C383B

Hi,

In my application I am using freescale P1022 QorQ processor which is having on chip Display Interface Unit (DIU) with 24 bit digital bus (8bit RGB). 

Display interface unit Specifications:

###########################

• Supports any resolution up to 1280×1024 (single-plane), or any resolution up to 1024×768 (3
multiple planes)
• Display refresh rate: 60 Hz (up to 1280×1024) or 72 Hz (up to 1024×768)
• Display color depth: up to 24 bpp
• Display interfaces: parallel TTL (+3.3V)

 

My application needs LVDS and DVI option.  I am planning to Ds90c383b for LVDS interface and TFP410 for DVI interface.  However the processor has only one DIU.  Could any one please suggest me any buffer / demux (1: 2 ) for this 28 bit (24bit RGB+4 Control) digital video bus.

 

Freescale P1022 [Digital video interface(DIU)]  --------> Buffer(1:2) ------|------>TFP-410

                                                                                                                               |-------->Ds90c383b

                                                                                                       

Regards,

Kiruba

  • 0
    TI__Mastermind 20985 points

    Kiruba,

    Connecting LVCMOS to multiple endpoints doesn't necessarily require a fanout buffer.  There are different connection schemes that can be used, and these picture shows two that can work well: http://i39.tinypic.com/25z2k5f.png.  On the bottom one, the resistor near the transmitter is optional and depends on the driver output impedance.  If the driver output impedance is smaller than the line characteristic impedance, then you want the resistor plus the driver impedance to equal the line characteristic impedance.  In the midst of accuracies/tolerances, the driver impedance + resistor should be slightly lower than the line characteristic impedance.

    Thanks,
    RE

  • 0 in reply to RE
    Prodigy 190 points

    Hi Rosse,

    Thanks for your immediate response.      Did you sent any picture in the " http://i39.tinypic.com/25z2k5f.png" ? (I see only a pixel in that link).


    Regards,

    Kiruba

  • 0 in reply to kiruba sankar
    TI__Mastermind 20985 points

    Please try IE.  It should work.

    Thanks,
    RE