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DS90UH949-Q1: EDID and HDMI input format

PYTsai
Genius 11575 points
Part Number: DS90UH949-Q1

Hi

We are using internal pre-program EDID. EDID Byte 24 said, both RGB 4:4:4 & YCrCb 4:4:4 are supported. 

Once HDMI source plug in, how to know if HDMI source is sending RGB 4:4:4 or YCrCb 4:4:4 ? 

If HDMI is sending YCrCb 4:4:4,  will DS90UH949 automatically convert to RGB4:4:4 ? 

Also DS90UH949 is connecting to DS90UH940, how to Program the input data format in HDMI terminology register 0x6B[3:2] , RGB444 or YUV444 ?   

  • 0
    TI__Genius 12866 points

    Do you mean the default EDID in 949? Could you share the EDID file?

    Best Regards,

    Charley Cai

  • 0 in reply to Charley Cai
    TI__Genius 11575 points

    Hi Charley,

    We configure the device to use internal SRAM EDID (default EDID)

    We do not load any data to EDID. at data sheet page 19, it shows the Internal Pre-Programmed EDID, is it the EDID for our case ? 

      

  • 0 in reply to PYTsai
    TI__Genius 12866 points

    In this case, only RGB4:4:4 should be set.

    Even if other color format is set, the 949 cannot do color space conversion. It will treats all data as RGB.

    When paired with 940, if color space conversion from RGB to YUV is needed. You can use the 940 register 0x6b to set the output color format.

    Best Regards,

    Charley Cai 

  • 0 in reply to Charley Cai
    TI__Genius 11575 points

    Hi Charley,

    May i clarify 

    1. we are using internal EDID and sometimes see HDMI sending YUV format, is it a correct behavior that this EDID setting expected to see ? 

    2. If we want only the RGB format to go into DS90UH949, is it correct we should modify the byte 24 of internal EDID to 0x02 ? 

    3. Is there any way for DS90UH949 to detect the input source format RGB or YUV ? 

  • 0 in reply to PYTsai
    TI__Genius 12866 points

    1. No, this is not expected. 

    2. Currently the default EDID byte 24 on the datasheet is set to 0xA which correspond to RGB4:4:4 only. If the HDMI source is still send YUV, then either the customer is using a different EDID or the HDMI source is not following the EDID. A dump of the EDID will be helpful for analysis. 

    3. No.

    Best Regards,

    Charley Cai