I want to use adv7604 to receive several video inputs on at the same time, but i do not know how long it will bring time delay when i switch into different video input? who can help me about the issue?
Thanks and Best Regards.
ADV7842 has 2 HDMI inputs, ADV7844 has 4 HDMI inputs. If you only care about analog-- ADV7842 makes more sense. We always recommend ADV7842 for new designs, not ADV7604 or ADV7441A.
You could probably estimate the switching time by looking at the scripts for a given setup and counting the number of writes for ADV7842 needed and then using that with your I2C bus speed. I would guess it would be on the order of 100s of ms.
DVI should be faster than HDMI without the HDCP though I'm not sure that it would be particularly faster or slower than analog inputs.
There is no fixed answer... it depends how fast you can program the part and what inputs you are switching from and to. I would not receommend ADV7604 for new designs in any case over the ADV7842/ADV7844 but if switching time is important ADV7604 is particularly bad because it doesn't support HDMI fast switching.
Thank you for your quick reply. High efficiency will be appreciated by all of us.
It seems you recommend we use adv7842/adv7844. What difference between adv7842 and adv7844?
My scenario is like this:
Two video inputs, like YPbPr and VGA will be fed in, and i want to switch one of them for processing, and the part will be controlled by MCU via I2C.
But the delay is very important, can you guess how long will delay between the switching?
If i use HDMI/DVI instead of VGA, how about the delay?
Thank you very much.
It seems adv7842 is the better choice. What do you mean by "I would guess it would be on the order of 100s of ms." ?
The delay is about 100ms of that?
If we want to get detail information docs and driver of adv7842, whether we should sign the NDA ? or other procedures?
All the doc's fo rthe ADV7842 can be found here:
The 100ms guess comes from how much needs to be written over the I2C bus, the speed of the bus, and how your system software handles the writes. The real switching time is dependent on both your software and hardware.
We have no drivers however the link provides scripts that allow you to switch modes.
Hi Dave and GuenterL,
Thank you all of your guides.
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