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Urgent: HDMI Receiver Compliance/Certification with ADV7611W

Question asked by padmanathanj on Jul 23, 2013
Latest reply on Jul 23, 2013 by DaveD

Hi All,

 

          In ADV7611W HDMI receiver based design, to meet the HDMI Compliance/Certification, we need the following Clarifications;

  1. Regarding the +5V from HDMI Connector;
  • Since the Absolute Maximum Rating for the RXA_5V pin in ADV7611W is given as 5.3V and the HDMI spec calls for the Maximum voltage at +5V Power pin as 5.3V; No Margin
    • We are planning to add a diode in series to the Input +5V Power from HDMI connector (to create Margin with the Diode Drop) before connecting to RXA_5V pin.
    • Is it ok to use a diode in series to +5V and then use this derived 5V to Power the RXA_5V pin and Pull-Ups of HPD, DDC (SCL/SDA), CEC? Interms of Certification/Compliance.
      • Please note that it is an Internal EDID based application (Car Infotainment system).

 

     2. Regarding the HPD Assertion with respect the "Enhanced DDC Sink" requirement in HDMI Specifications;

  • As per the HDMI Spec it states that "the E-EDID information should be available in DDC within 20ms  after the +5V Power Signal is provided".
    • This derives to the requirement that the HPD should not be asserted until the Internal EDID is ready (initialized/configured by the Host).
  • Our Application uses Internal EDID of ADV7611W HDMI Receiver.
  • In our actual Unit, once the Unit is Powered ON, the CPU takes considerable time to boot and then to Intialize the HDMI Receiver (ADV7611W) and its internal EDID.
    • Our SW automatically asserts the HPD once the Initialization of HDMI Receiver is done; so that the Source can re-read the EDID contents and send the Correct resolution HDMI output. Hence the Funtionality is not affected.
    • However, Meanwhile (during Boot-up and Intialization), if a HDMI source is already connected to its HDMI port, the HPD would have been already assereted when the EDID is not ready (for more than 10 seconds);
      • This deviates the "<20ms" requirement stated in HDMI spec.
      • Does this deviation affects any of the HDMI Certification or Compliance Tests?
      • Is this 20ms a mandatory requirement which could be measured in any of the HDMI compliance tests?

 

Please help to respond urgently.

 

Thanks & Regards,

Padmanathan J

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