Overview
MPC5606S Microcontroller Reference Manual, Rev. 7
Freescale Semiconductor 65
internal and/or external memory are performed by the internal four-channel DMA of the DCU providing
a high speed/low latency access to the system backbone.
Control Descriptors (CDs) associated with each layer enable effective merging of different color formats
into one plane to optimize use of internal memory buffers. A layer may be constructed from graphic
content of various color formats including 1bpp, 2bpp, 4bpp, 8bpp, 16bpp, 24bpp, and 24bpp+alpha. The
ability of the DCU to handle input data in formats as low as 1bpp, 2bpp, and 4bpp enables highly efficient
use of internal memory resources of the MPC5606S. A special tiled mode can be enabled on any of the 16
layers to repeat a pattern, optimizing graphic memory usage.
A hardware cursor can be managed independently of the layers at blending level, increasing the efficient
use of internal DCU resources.
To secure the content of all critical information to be displayed, a safety mode can be activated to check
the integrity of critical data along the whole system data path from the memory to the TFT pads.
The DCU features the following:
• Display color depth: up to 24 bpp
• Generation of all RGB and control signals for TFT
• Four-layer blending at each pixel position
• Maximum number of input layers: 16 (fixed priority)
• Dynamic Look-Up Table (color and gamma look-up)
• blending range: up to 256 levels
• Transparency mode for font or single foreground color graphics
• Gamma correction
• Tiled mode on all the layers
• Hardware cursor
• Critical display content integrity monitoring for Functional Safety support
• Internal Direct Memory Access (DMA) module to transfer data from internal and/or external
memory
1.5.25 Parallel Data Interface (PDI)
The PDI is a digital interface used to receive external digital video or graphic content into the DCU.
The PDI input is directly injected into the DCU background plane FIFO. When the PDI is activated, all
the DCU synchronization is extracted from the external video stream to guarantee the synchronization of
the two video sources.
The PDI can be used to:
• Connect a video camera output directly to the PDI
• Connect a secondary display driver as slave with a minimum of extra cost
• Connect a device gathering various video sources
• Provide flexibility to allow the DCU to be used in slave mode (external synchronization)
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