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SN65LVDS86A: LVDS to MIPI DSI Bridge

Abraham Garcia
Prodigy 40 points

Part Number: SN65LVDS86A
Other Parts Discussed in Thread: TFP410

Hello,

 

I'm looking for an IC that is capable of converting LVDS-OLDI to MIPI-DSI. I found that this has been quite challenging to bridge so I'm looking for any solution, one way I'm currently looking into is going from LVDS-OLDI to Parallel RGB then to MIPI DSI.

 

The chip SN65LVDS86A looks like it might be a candidate but only handles 18-bit, is there a 24 bit option? The datasheet for this IC isn't clear on what D23:0 is. I know they're the RGB connections based on Fig. 10, however there is no explicit description for these signals. Is there anyway to get more information?

 

If this chip isn't a practical solution, are there any LVDS-OLDI to HDMI solutions you may have?

 

Thanks.

  • 0
    TI__Genius 10836 points

    Hi Abraham,

    Unfortunately, we don't have anything that can output a DSI signal. 

    Since you mentioned LVDS to HDMI, I found this other E2E ticket that seems to have a solution and additional information for converting from LVDS to a HDMI/DVI output. Could you give this a look and see if it will meet your needs?

    https://e2e.ti.com/support/interface-group/interface/f/interface-forum/1363801/ds90cr288a-lvds-rgb-to-hdmi/5209068?tisearch=e2e-sitesearch&keymatch=lvds%252520to%252520hdmi#

    Best,

    Cameron

  • 0 in reply to Cameron Hoholik-Carlson
    Prodigy 40 points

    Thank you Cameron.

    This chip doesn't look like it accepts LVDS but Parallel RGB instead. It might be possible for me however my bridge is going to be:

    LVDS-OLDI -> Parallel RGB -> HDMI -> MIPI DSI

    That's quite a lot of conversions, I'd like to try and limit it to 3 if possible. Do you know how this might affect the display performance? I haven't gotten to it yet but I reckon that timing may be an issue.

    Also I believe I stumbled across the TFP410 before, I believe I read somewhere that this part does not have an Eval board and is an older part that currently has no plans to be obsoleted. Is this true? This may potentially be put in a new design.

  • 0 in reply to Abraham Garcia
    TI__Genius 10836 points

    Hi Abraham,

    I agree that the implementation you outlined has a lot of conversions. There would definitely be some impact to signal integrity, but without testing a similar setup I would not be certain. 

    Besides the number of conversions, the other road block is that we don't have a device that will output DSI. So the last link in your chain is what we don't have a solution for. Is the only input for your display DSI? Or does the downstream display have other inputs available?

    Abraham Garcia said:
    Also I believe I stumbled across the TFP410 before, I believe I read somewhere that this part does not have an Eval board and is an older part that currently has no plans to be obsoleted. Is this true? This may potentially be put in a new design.

    You are correct that there is no EVM for that chip, but it looks like the ticket I linked in my last reply has another ticket with an attached reference design TI has used internally for that chip. But, if the part is not marked for EoL on ti.com, then it is okay to be used in new designs.

    Best,

    Cameron

  • 0 in reply to Cameron Hoholik-Carlson
    Prodigy 40 points

    Good morning Cameron,

    Unfortunately the display only contains DSI. We are supplied with an IC from the manufacturer that converts HDMI to DSI so that is another possibility but that is automatically forcing a chain. So far I think the simplest way is to go from Parallel RGB -> HDMI -> MIPI DSI, though this will involve more coding. Do you have any solutions for HDMI conversion? 

  • 0 in reply to Abraham Garcia
    TI__Genius 10836 points

    Hi Abraham,

    I see, I definitely think you will need to make use of the HDMI to DSI converter in order to get this working, otherwise we won't have another way to get the video to a DSI format.

    We potentially have additional solutions for getting to HDMI, but I would like to clarify what the video source capabilities are first. Does your source only have OLDI output or can it do RGB output as well (or any other outputs)? Are you using a specific SoC as a video source or something else?

    Best,

    Cameron