Display Control Unit (DCU)MPC5606S Microcontroller Reference Manual, Rev. 7336 Freescale Semiconductor• Digital video input with and without sync extraction per ITU-R BT.656 supporting multiple videoinput formats including RGB666, RGB565, monochrome and YCbCr422• Dedicated memory blocks to store a cursor and Color Look Up Tables (CLUTs)Each graphic layer has the following attributes• Can be placed with one pixel resolution in either axis• Supports multiple color-encoding formats including 1, 2, 4, and 8 bits per pixel indexed colors,RGB565 and RGB888 direct colors, and ARGB1555, ARGB4444 and ARGB8888 direct colorswith an alpha channel• Alpha blending with 8-bit resolution• Chroma-key blending for anti-mask encoding• Multiple alpha and chroma-key blending modes• Transparency modes for anti-aliased text and graphics• Luminance mode for highlighting content• Tile mode for efficient creation of textured background content12.1.3 Modes of operationThe DCU has four modes of operation:• DCU_OFF: When in this mode, the DCU is turned off. All the logic in the design is put in resetstate to reduce power.• NORMAL_MODE: The DCU displays and blends the graphics specified by the layer descriptors.• PDI_MODE: A mode which fetches video from an external video source and combines that withthe graphics configured on the layers.• COLBAR_MODE: Color bar generation for testing purposes.12.2 External signal description12.2.1 OverviewThe DCU has up to 22 input signals and up to 30 output signals. See Figure 12-2. The choice of signalsused depends on the configuration of the DCU. All active signals must be enabled by configuring theappropriate PCR registers in the SIUL module.
