PXD10RM Datasheet, PDF (441/1332 Pages) Freescale Semiconductor, Inc – PXD10 Microcontroller

12.8.2.2 PDI interaction with other modules
Video source fed directly to PDI
Video
Source
Other layer data to
mix with PDI
(BG layer)
PXD10
DCU
Display
Driver/
Screen
PDI
Data being sent at
PDI rate
PDI output in format
required by DCU
Figure 12-84. PDI Interacting Directly with the External Sensor
In Figure 12-84, PDI directly accepts the data from the external video source. External device must support
the interface mentioned in the document.
Video source output fed directly to FPGA,
which converts the data to a format
required by the PDI.
Other layer data to
mix with PDI
(BG layer)
PXD10
DCU
Display
Driver/
Screen
Video
Source
FPGA
PDI
Data being sent at
PDI rate
PDI output in format
required by DCU
Figure 12-85. PDI Interacting with FPGA in Between
As shown in Figure 12-85, PDI would not directly interface to the video source or any existing image
processor chip. FPGA sits in between.
In normal mode, PDI clock frequency should be equal to pixel clock frequency desired for the TFT display
driver. In narrow mode, PDI clock frequency is double the desired pixel clock frequency. The incoming
clock does not have to bear any relation to the DCU clock. Prior to the lock condition the DCU will run
on the internal DCU clock. After lock has been achieved, the DCU will switch to the clock from the PDI
stream.
PDI clock would be used to send data and timing signal to TFT/LCD display driver.
Freescale Semiconductor
PXD10 Microcontroller Reference Manual, Rev. 1
Preliminary—Subject to Change Without Notice
12-109