>I would like the inputs to be checked for about 320 micro seconds
>each, before it checks the next source (as this is the time it
>takes for 5 lines of syncs). I would like the data to be sent once
>for each of the checks on the different sources.

From this I take it that you are looking for the vertical sync pulse from
the video stream? It is probably easier to use a specialised sync seperator
IC such as National Semiconductor make ( do not have the chip number to hand
sorry) to do this.

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