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Preliminary
S3C2451X RISC MICROPROCESSOR
CAMERA INTERFACE
23-9
Preliminary product information describe products that are in development,
for which full characterization data and associated errata are not yet available.
Specifications and information herein are subject to change without notice.
MEMORY STORING METHOD
The storing method to the frame memory is the little-endian method in codec path. The first entering pixels stored
into LSB sides, and the last entering pixels stored into MSB sides. The carried data by AHB bus is 32-bit word.
So, CAMIF make the each Y-Cb-Cr words by little endian style. For RGB format, two different formats exist. One
pixel (Color 1 pixel) is one word for RGB 24-bit format. Otherwise, two pixels are one word for RGB 16-bit format.
Refer to next diagram.
Y frame memory
PCLK
DATA
ITU-601/656 YCbCr
4:2:2 8-bit input timing
Cb frame memory
Cr frame memory
Little endian method
time
Y1
Cb1
Y2
Cr1
Y3
Cb2
Y4
Cr2
Little endian method
Little endian method
RGB frame memory
(24-bit)
RGB frame memory
(16-bit)
32-bit
32-bit
16-bit
YCbCr 4:2:2 interleave memory
Little endian method
Camera
Interface
Y4
Y3
Y2
Y1
Y8
Y7
Y6
Y5
Cb4
Cb3
Cb2
Cb1
Cb8
Cb7
Cb6
Cb5
Cr4
Cr3
Cr2
Cr1
Cr1
Cr7
Cr6
Cr5
Cr1
Y2
Cb1
Y1
Cr2
Y4
Cb2
Y3
RGB1RGB2 RGB3RGB4RGB4RGB6RGB7RGB8
RGB2/1
RGB4/3
RGB6/5
RGB8/7
RGB10/9 RGB12/11 RGB14/13 RGB16/15
R G B
2
1
R 5
G 6
B 5
Figure 23-10. Memory storing style