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[ADV7611] How to detect lock / unlock HDMI when resolution is changed.

Question asked by Tamu on Jul 2, 2015
Latest reply on Jul 7, 2015 by Tamu

Hello,

 

I have some questions about ADV7611.

 

My customer uses ADV7611 for their project.
They want to know HDMI lock/unlock when the resolution is changed by HDMI source with keeping inserted HDMI cable.
When unlock is detected by changing the resolution, they try to insert black image so that any flicker cannot be seen.
They don't use interrupt. They use polling register status bits per 10ms because they have no time to change their S/W.

 

Question 1:
What is the best register bits for detecting HDMI lock or unlock?
Now they use IO Map 0x6A[1:0](V_LOCKED_RAW, DE_REGEN_LCK_RAW) and HDMI MAP 0x07 [7] and [5](VERT_FILTER_LOCKED, DE_REGEN_FILTER_LOCKED).

 

Question 2:
May these registers (V_LOCKED_RAW, DE_REGEN_LCK_RAW, VERT_FILTER_LOCKED and DE_REGEN_FILTER_LOCKED) be unstable like chattering?
The customers don't want the CPU to detect lock/unlock incorrectly.
Can these registers be stable without chattering after HDMI lock or unlock?

 

They don't use interrupt. They are going to use polling register status bits per 10ms because they have no time to change their S/W.

 

Thank you!
Best regards.

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