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TFP401 HDMI --> LVDS

Mark Pearson
Genius 12705 points
Other Parts Discussed in Thread: TFP401A

Hi HS I/F forum,

 

I had a question about the HDMI output capabilities for OMAP4.  How flexible is the frame buffer for the HDMI output?  For example, can we use the RGB output to drive a 1280x800 display and HDMI out to drive an independent image, something like another 1280x800 display or 800x600?  My initial thought is that we should be able to use an independent frame buffer for each display, since we won’t be using the DSI outputs.

 

Also, is TI aware of an IC which can translate HDMI to LVDS (TIA/EIA-644)?

 

This is a question that originated from our customer: Garmin.

 

  • 0
    TI__Mastermind 43875 points

    Mark,

    For conversion from HDMI to LVDS I am not aware of a single device which can do this. but you could use something like a TFP401A directly coupled to an LVDS83B.

    This would require the HDMI output from OMAP to be configured for DVI compliant mode, i.e. no audio, no AVR packets etc... and RGB color space, but this should not be an issue.

    Alternatively any other HDMI receiver could be used in place of the TFP401A, configuring the HDMI receiver to output 24 bit RGB data which would then feed into the LVDS83B.

    The timings in OMAP are flexible so it should be possible to generate any desired format. There are a few minor limitations but these are not likely to arise when driving LVDS displays.

    Each output can also have its own frame buffer, yes.

    BR,

    Steve