(ADV7611)Why ADV7611 output SCLK befor HDMI input?

Hi !

Various register settings are made after the ADV7611 power is turned on, regardless of the TMDS input.

At that time, “TRI_AUDIO, IO, Address 0x15 [4]”: 1 → 0 was also set, and 9.8437MHz SCLK was output even HDMI is not input.

This frequency is considered to be determined by the ADV7611 device, but as the description can not be found on the specifications including "UG-180.pdf".

Q1)
Why ADV7611 output this frequency?

Q2)

Is the frequency always constant at 9.8437 MHz?

Best regards

Kawa

Parents Reply
  • Hi !

    We will wait your update.

    Our point is when user set up ADV7611 even if their is no HDMI input, what is the value for SCLK frequency.

    We want know because our customer want to reduce EMI.

    So it will be useful if you can tell how to limit ADV7611 SCLK frequency but still we want to know the initial SCLK frequrncy.

    Also I understood that SCLK is 64 times the LR.

    Then we want to know LR sample clock initial frequency.

    Anyway we will wait your advice


    Best regards

    Kawa

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