(ADV7611)Why ADV7611 output SCLK befor HDMI input?

Question

Hi ! 
 
 Various register settings are made after the ADV7611 power is turned on, regardless of the TMDS input. 
 At that time, &ldquo;TRI_AUDIO, IO, Address 0x15 [4]&rdquo;: 1 &rarr; 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

PoornimaSubramani · Accepted Answer

Hi, 
 The recommendation from the expert in this case will be " to tristate the audio pin until audio is present and have not qualified the behaviour for when the audio source is not present but the pins are not tristated as the recommendation is to tristate until there is audio " 
 
 Thanks, 
 Poornima)

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(ADV7611)Why ADV7611 output SCLK befor HDMI input?