Let’s look at connecting up to some video sources. There is not too much difference from what we’ve seen before in the general sense, we have the control channel here where we are looking at a CMOS image sensor. The control channel in this diagram is through the two wire interface that connects to the sensor’s I²C bus. That is used for configuration of the device where the actual data flows straight into the 8-bit PPI in this case. There’s no reason that this couldn’t be a 10-bit, 12-bit, or even 16-bit application, depending on the resolution of the sensor, of the imager that you’re connecting to. But this diagram shows an 8-bit connection. The imager in this case usually will provide the pixel clock as well as some kind of framing. The horizontal sync will demarcate the valid line region and the Vsync will be a “frame valid” type of signal. Of course many sensors also support the BT.656 standard in which case these synchronization signals are not needed.