What signals are present on ADV7612's audio outputs when it is in free-run mode? Are they all valid?
Yes-- the clocks all will free run as I said after a valid input has been locked at the last locked mode. By "garbage" I meant the actual data is not valid.
I'm pretty sure they are not valid but I'll check.
It'll free run at the last valid frequency but it's just garbage.
Why video and audio outputs of ADV7612 behave differently in free-run if video and audio are both parts of HDMI?
Why audio is in a less preferential position as compared to video?
There is simply no pattern generator for Audio as there is for Video. No customer has ever asked for it-- a fixed tone to go along with a blue screen sounds pretty annoying as a feature.
1 kHz fixed tone could be one of possible options.
Not to annoy the listeners as another possible option AudioData could be all muted to zeros, but with valid MCLK, LRCLK and SCLK or whatever was the last before entering free-run.
From this thread http://ez.analog.com/message/123518#123518 it seems that in free-run mode LRCLK is producing valid 48 kHz:
If we connect a valid source to EVAL board input, the LRCLK goes to 48kHz and there is no noise. When we disconnect the input, LRCLK remains at 48kHz and there is still no noise.
If SCLK is also valid, than that will be enough for our application.
So, the questions are:
1). Can You confirm the above, that LRCLK remains at 48kHz in free-run?
2). Is SCLK also valid in free-run?
The content of AudioData in free-run doesn't matter for our application.
How to set the adv7612 register so that LLC,DE and VS go to logic low when the hdmi cable unplug?
when I set it to none free mode ,it always generate those signals when I unplug the cable.
below is my setting :
CP 0xBF = 0x16
CP 0xBA = 0x00
How to set the adv7612 register so that LLC,DE and VS go to invalid when the hdmi cable unplug?
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