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32bit 1080P DDR LVDS SERDES

chris weinold
Prodigy 20 points
Other Parts Discussed in Thread: DS92LV3242, DS92LV3241, SN75LVDS83B, TFP410, TFP401

We have an application to support an LCD type display some short distance from our video controller. Video is 32 bits, 1080P, 1.8V and I was considering use of the DS92LV3241/DS92LV3242.

A colleague pointed out that our video data is DDR (double data rate) and because the DS92LV324SDR/DS92LV3242 is a SDR (single data rate) device it will not work for this application.

I have two questions:

1. Can someone please suggest a DDR LVDS SERDES that might be a good choice for this application ?

2. Is there a simple solution to use the DS92LV324SDR/DS92LV3242 in a DDR application ? I would think it's only a matter of doubling the clock at the tx side, and dividing the clock by 2 at the RX side. What would be the concerns with doing this ?

Thanks a lot

  • 0
    TI__Mastermind 20820 points

    Hi Chris,

    I moved this post to the consumer and computing interface forum because this is the group within TI that supports video driver solutions. I will check back on your post to make sure that it gets responded to. Thank you for your patience!

    Regards,

    Mike

  • 0
    TI__Guru* 76130 points

    Hello,

    All the serdes devices in this group are SDR only as well. What are the timing/frequency constraints of your application that require a DDR device?

    Regards.

  • 0 in reply to Elias Villegas M.
    Prodigy 20 points

    Thank you,

    The video controller outputs 1.8V 32 bit DDR 1080P video. This type of controller is similar to ones used with LCD panels.

    Any ideas ?

  • 0 in reply to chris weinold
    TI__Guru* 76130 points

    I can only think in a multi-chip solutions.

    For example, using two SN75LVDS83B in parallel, one of them latching on the rising edge and the other one latching on the falling edge, then add a FET switch to provide the corresponding LVDS channels one at a time.

    Another solution would be use a DVI transmitter like the TFP410 which supports DDR to transmit the signals through differential channels, then use a DVI receiver like the TFP401 and then use a flatlink transmitter to convert the signals to LVDS.

    Both of them have never been tried and you will have to deal with big signal integrity issues.

    I recommend to look for some DSP or DaVinci processor, they might have something.

    Regards.