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RM0351 Chrom-Art Accelerator™ controller (DMA2D)
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12 Chrom-Art Accelerator™ controller (DMA2D)
The DMA2D is present on L496/L4A6 devices only.
12.1 DMA2D introduction
The Chrom-Art Accelerator™ (DMA2D) is a specialized DMA dedicated to image
manipulation. It can perform the following operations:
• Filling a part or the whole of a destination image with a specific color
• Copying a part or the whole of a source image into a part or the whole of a destination
image
• Copying a part or the whole of a source image into a part or the whole of a destination
image with a pixel format conversion
• Blending a part and/or two complete source images with different pixel format and copy
the result into a part or the whole of a destination image with a different color format.
All the classical color coding schemes are supported from 4-bit up to 32-bit per pixel with
indexed or direct color mode. The DMA2D has its own dedicated memories for CLUTs (color
look-up tables).
12.2 DMA2D main features
The main DMA2D features are:
• Single AHB master bus architecture.
• AHB slave programming interface supporting 8/16/32-bit accesses (except for CLUT
accesses which are 32-bit).
• User programmable working area size
• User programmable offset for sources and destination areas
• User programmable sources and destination addresses on the whole memory space
• Up to 2 sources with blending operation
• Alpha value can be modified (source value, fixed value or modulated value)
• User programmable source and destination color format
• Up to 11 color formats supported from 4-bit up to 32-bit per pixel with indirect or direct
color coding
• 2 internal memories for CLUT storage in indirect color mode
• Automatic CLUT loading or CLUT programming via the CPU
• User programmable CLUT size
• Internal timer to control AHB bandwidth
• 4 operating modes: register-to-memory, memory-to-memory, memory-to-memory with
pixel format conversion, and memory-to-memory with pixel format conversion and
blending
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