Display Control Unit (DCU)
MPC5606S Microcontroller Reference Manual, Rev. 7
Freescale Semiconductor 447
The 8-bit monochrome image is equivalent to 8-bit grayscale images. For converting 8-bit monochrome
data to RGB data, each of the R/G/B components will have a value equal to the 8-bit monochrome value.
RGB extraction starts when PDI is enabled (from the next falling edge of validated vertical blanking
period).
12.8.2.7 PDI-related interrupts
PDI can be configured to trigger an interrupt when synchronization is achieved i.e. it receives the
pre-specified numbers of frames without error. PDI would also give an interrupt when synchronization is
lost i.e. it receives any error in frame there after. This interrupt is raised when hsync/vsync is lost.
Correctable ECC error interrupts for errors during extraction of preambles. No error correction is done.
Non-correctable ECC error interrupt for the preamble errors that cannot be corrected.
Blanking sequence error is received in case 80h 10h is not found in vertical and line blanking period during
internal synchronization.
Activity detection interrupt for CLK detection.
Hsync activity detection interrupts. It would be generated from the state machine. Vsync activity detection
interrupts. It would also be generated from the state machine.
Activity detection interrupt for data enable. Activity lost interrupt for CLK — for CLK lost interrupt, it is
assumed that ipg_clk would be active for entire duration, if pdi_clk_frequency is less than or equal to ipg
clock frequency/32, then the interrupt is triggered. (i.e. if ipg_clk freq. max = 64 MHz then the
PDI_CLK_LOST flag will be set if pdi clk freq. min < 2 MHz).
All interrupts are RW1C (write one to clear). All interrupts are maskable.
PDI must reset to show the latest status of the clock activity detect interrupt.
12.9 DCU initialization
The following steps describe a typical approach to initializing the DCU for use in an application.
1. After reset configure the DCU peripheral to be active using the mode entry module and configure
the DCU clock source in the MC_CGM.
2. Configure the output ports in the SIUL as required.
Table 12-69. Data extraction in all possible modes
PDI mode Narrow mode Pins RGB data Notes
8-bit monochrome mode 1'b0 8-bit pdi_datain —
RGB565 1'b0 16-bit Pdi_datain —
RGB666 1'b0 18-bit pdi_datain —
RGB565 muxed 1'b1 8-bit pdi_datain Data from two clocks are combined.
YCbCr422 1 8-bit pdi_datain Data from four clocks are combined for
two pixels.
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