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Interfacing-AV-Slide39

Again, this particular encoder does not need them. Many video encoders do not need them because they adhere to the 656 recommendation. In this case the oscillator is external to both the encoder and the Blackfin device, whereas in the decoder case there was that line locked clock that directly sourced the PPI clock. Now TFT, or Thin Film Transistor, LCD panels are kind of different from what we’ve looked at so far in some ways. But, in some ways they’re very similar. If we look at the middle of this picture we see again the same kinds of things we’ve seen before for connecting to a video device. We have the horizontal and vertical syncs, the data sampling clock, and in this case again the clock is external to both the PPI and the LCD panel. So that’s the signaling layer, the synchronization layer. On the bottom is the data bus. When connecting to TFT-LCD panels, the whole 16-bit data bus is being used because most of these TFT panels are 18-bits and beyond. Essentially we have 16-bits from the PPI connecting to the 18-bit panel.

PTM Published on: 2006-08-24