LazyLizard

How does HDMI increase bandwith.

The only way to increase bandwidth for the same number of pins is to increase the frequency the signal operates at. HDMI 1.0 to 1.2 operates at 165 MHz. 1.3 and 1.4 operates at 340MHz. 2.0 operates at 600MHz. Since the protocol is basically the same, all you have to do to retain backwards compatibility with an older version is downclock the signal and don't use any messages newer than that version.

 

However, I would imagine at some point increasing the frequency will no longer be an option. At that point I believe they'll start using the HDMI B plug (yes there is a thing), or use a more data efficient protocol.

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