Display Control Unit (DCU)MPC5606S Microcontroller Reference Manual, Rev. 7Freescale Semiconductor 43912.8.2.2 PDI interaction with other modulesFigure 12-82. PDI interacting directly with the external sensorIn Figure 12-82, PDI directly accepts the data from the external video source. External device must supportthe interface mentioned in the document.Figure 12-83. PDI interacting with FPGA in-betweenAs shown in Figure 12-83, PDI would not directly interface to the video source or any existing imageprocessor chip. FPGA sits in between.In normal mode, PDI clock frequency should be equal to pixel clock frequency desired for the TFT displaydriver. In narrow mode, PDI clock frequency is double the desired pixel clock frequency. The incomingclock does not have to bear any relation to the DCU clock. Prior to the lock condition the DCU will runon the internal DCU clock. After lock has been achieved, the DCU will switch to the clock from the PDIstream.PDI clock would be used to send data and timing signal to TFT/LCD display driver.In all cases, the resolution of the incoming stream and the Hsync and Vsync frequency must be the sameas that of the TFT screen. All the horizontal parameter (Front Porch width, Back Porch width, Pulse width)VideoSourceVideo source fed directly to PDIOther layer data tomix with PDI(BG layer)PDIDCU DisplayDriver/ScreenData being sent atPDI ratePDI output in formatrequired by DCUVideo source output fed directly to FPGA, Other layer data tomix with PDI(BG layer)PDIDCU DisplayDriver/ScreenPDI output in formatrequired by DCUVideoSource FPGAwhich converts the data to a formatrequired by the PDI.Data being sent atPDI rate
