HDMI Instant switching

There are several causes to switching delay

1) Sink locking to new video stream.  medium delay

2) The device switching between sources, normally related to PLL locking to new source on the switch event. short delay

3) HDCP re-authentication when switching from one source to another (topology changes).  long delay

Of these the HDCP is usually the slowest one to happen.

The ADV7623 has fast port switching (XpressView).  Basically it maintains an HDCP link authenticated on both input ports, it can switch without having to re-authenticate.

Normally when switching occurs the screen will go to black.

I am not familiar with the SI parts.

When you say a delay between switches, how long is this delay?

All three delays can add up.

Hi Guenter,

Thanks for the quick reply. The customer needs to spend some time on understanding the time delay. They also will not be streaming motion picture content, but I still think they are required to have HDCP. Is that correct?

that was meant to say HDCP licence

I they have any HDCP keys in their system they will need and HDCP license.

I they have any HDCP keys in their system they will need and HDCP license.

Hi Guenter,

So, the customer only needs the switching function, is there another device you would recommend?

If they are switching sources requiring HDCP, then according to HDCP rules the entire topology needs to be re-authenticated.

If they don't deal with HDCP then there are several other ways to handle the TMDS switching.

Hi Guenter,

Yep, they have clarified they don't need to deal with the HDCP, can you recommend a switch that would be almost instant?

Thanks,

Anita

If all they are switching HDMI/DVI then check this link out

https://www.analog.com/en/products/audio-video/hdmidvi-switches.html

Switch will be fast, still need time for sink to lock to new stream

Since they are switching only, then they don't need an HDCP license, correct?

Correct.

You only need a license if there is HDCP anywhere in you design