PXD20RM Datasheet, PDF (447/1628 Pages) Freescale Semiconductor, Inc – PXD20 Microcontroller

11.8 Parallel Data Interface (camera interface)
11.8.1 PDI interface description
11.8.1.1 Introduction
This block extracts the timing and pixel information from an external video source and passes it to the
DCU3 block to synchronize with the timing and display the pixel information on the TFT LCD screen.
The BGND layer in the DCU3 is replaced by the incoming video stream.
The PDI requires that the incoming video stream match the resolution and timing at which the DCU3 is
driving the TFT LCD panel and the incoming stream must not be interlaced.
The PDI can also be configured in slave mode in which case it ignores the pixel information from the
external video source and only passes the timing information to the DCU3 to synchronize with. In this
instance the DCU3 will continue to operate as normal (the BGND layer will not be altered) but will use
the timing from the PDI.
The PDI shares configuration registers with the DCU3.
11.8.1.2 PDI interaction with other modules
Video source fed directly to PDI
PXD20
Other layer data to
mix with PDI
DCU3
Display
Driver/
Screen
Video
Source
PDI
Data being sent at
PDI rate
PDI output in format
required by DCU3
(PDI becomes BG
layer)
Figure 11-88. PDI interacting directly with the external sensor
In Figure 11-88, the PDI accepts data and timing directly from the external video source. The external
device must output the video in a digital format supported by the PDI.
Freescale Semiconductor
PXD20 Microcontroller Reference Manual, Rev. 1
Preliminary—Subject to Change Without Notice
11-113