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Keep EDID data ADV748X only with 5V via HDMI connector

henry-tang
on Mar 29, 2017

Dear Sir/Madam,

Can I keep ADV748X EDID data in EDID RAM if system only provides 5V power via HDMI connector, and the other power are all power down? 

If I can't keep those data with HDMI 5V, how would you suggest me to do in order to pass HDMI certification item (Test ID 8-1) which requires that EDID can be read after powering down for general case.

Thanks very much!

Henry

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  • 0 on Mar 31, 2017 7:30 AM

    Hi Jeyasudha.M,

    Here's test scenario :

    1. Power ON ADV7481 and master will write EDID data to ADV7481's EDID RAM

    2. Connect HDMI Tx with HDMI Rx through HDMI cable, and Tx side will read ADV748X EDID data

    3. Power OFF ADV7481 but there's still 5V on HDMI cable from HDMI Tx

    4. Tx side will read ADV7481 EDID data again and compare with EDID date we read in step.2 to check whether is the same.

    Like ADV7623 specify as below, but it is not listed in ADV7481 datasheet : 

    So may need your help to confirm whether can ADV7481's EDID RAM keep data after main power down but HDMI 5V still exist, thanks!

    Best Regards,

    Henry 

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  • 0 on Mar 31, 2017 7:30 AM

    Hi Jeyasudha.M,

    Here's test scenario :

    1. Power ON ADV7481 and master will write EDID data to ADV7481's EDID RAM

    2. Connect HDMI Tx with HDMI Rx through HDMI cable, and Tx side will read ADV748X EDID data

    3. Power OFF ADV7481 but there's still 5V on HDMI cable from HDMI Tx

    4. Tx side will read ADV7481 EDID data again and compare with EDID date we read in step.2 to check whether is the same.

    Like ADV7623 specify as below, but it is not listed in ADV7481 datasheet : 

    So may need your help to confirm whether can ADV7481's EDID RAM keep data after main power down but HDMI 5V still exist, thanks!

    Best Regards,

    Henry 

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