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POST PROCESSOR
2.1 DMA Mode Operation
Various source and destination image formats can be selected according to the mode configuration as
described in Table 15-1 a). Source image format is one of the following YCbCr420, YCbCr422, RGB16-bit
(565format) and RGB 24-bit format. Destination image format is identical to the source image format such as
YCbCr420, YCbCr422, RGB 16-bit (565format) and RGB 24-bit format. The detail control signal is defined in
Table 15-1 b)
In the case of YCbCr420 source/destination image format, each component of Y, Cb and Cr is stored in each
own separated address space without any interleaving as shown in Case A of Figure 15-3 (a) and Figure 15-4. In
the other cases, either byte or half-word interleaving is applied within unified address space as described in
Figure 15-3 (b). Byte interleaving order of YCbCr422 source image can be selected either from YCbYCr or
CbYCrY as shown in case B and C of Figure 15-3 (b) and Figure 15-4. Byte order of RGB 24-bit and half-word
order of RGB 16-bit are described in case D and E of Figure 15-3 (b) and Figure 15-4.
In both cases of YCbCr420 and YCbCr422 source image format, whether MPEG4 format or MPEG2/H.263
format needs to be selected according to the sampling position of the chroma information as shown in Figure 15-
4. Destination image have the same sampling position of source image when both source and destination image
are YCbCr format. If source image is RGB format and destination image is YCbCr format, the sampling position of
chroma component is the same position of Luma.
All source and destination image data must be stored in memory system aligned with word boundary. It means
that neither byte nor half-word size DMA operations are supported (For more information refer to chapter 15-4 for
DMA operation). Therefore, the width of source and destination image must be selected to satisfy the word
boundary condition (For more information refer to chapter 15-3 for image size).
Preliminary product information describe products that are in development,
15-4
for which full characterization data and associated errata are not yet available.
Specifications and information herein are subject to change without notice.
S3C6400X RISC MICROPROCESSOR
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