PXD10PB Datasheet, PDF (10/26 Pages) Freescale Semiconductor, Inc – 32-bit Power Architecture® Microcontrollers for Entry Level Display Solutions

Features
2.4.3 Display Control Unit (DCU)
The DCU is a display controller designed to drive TFT LCD displays capable of driving up to WQVGA
resolution screens with 16 layers and 4 planes with real time alpha-blending.
The DCU generates all the necessary signals required to drive the display: up to 24-bit RGB data bus, Pixel
Clock, Data Enable, Horizontal-Sync and Vertical-Sync.
Internal memory resource of the PXD10 allows to easily handle complex graphics contents (pictures,
icons, languages, fonts) on a color TFT panel in up to Wide Quarter Video Graphics Array (WQVGA)
sizes. All the data fetches from 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 resolutions into
one plane to optimize use of internal memory buffers. A layer may be constructed from graphic content of
various resolutions including 1bpp, 2bpp, 4bpp, 8bpp, 16bpp, 24bpp and 24bpp+alpha. The ability of the
DCU to handle input data in resolutions as low as 1bpp, 2bpp and 4bpp enables a highly efficient use of
internal memory resources of the PXD10. 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 the 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-plane blending
• 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
• 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.
PXD10 Product Brief, Rev. 1
10
Freescale Semiconductor