PXD20RM Datasheet, PDF (564/1628 Pages) Freescale Semiconductor, Inc – PXD20 Microcontroller

12.8 Parallel Data Interface (camera interface)
12.8.1 PDI interface description
12.8.1.1 Introduction
This block extracts the timing and pixel information from an external video source and passes it to the
DCULite block to synchronize with the timing and display the pixel information on the TFT LCD screen.
The BGND layer in the DCULite is replaced by the incoming video stream.
The PDI requires that the incoming video stream match the resolution and timing at which the DCULite
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 DCULite to synchronize with. In this
instance the DCULite 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 DCULite.
12.8.1.2 PDI interaction with other modules
Sensor input fed directly to PDI
Other layer data to
mix with PDI
Device
Video
Sensor/
Camera
Output
DCULite
Display
Driver/
Screen
PDI
Data being sent at
PDI rate
PDI output in format
required by DCULite
(PDI becomes BG
layer)
Figure 12-87. PDI interacting directly with the external sensor
In Figure 12-87, 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.
12-102
PXD20 Microcontroller Reference Manual, Rev. 1
Preliminary—Subject to Change Without Notice
Freescale Semiconductor