Samsung S3C2451X User Manual page 601

S3C2451X RISC MICROPROCESSOR
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.
ITU-601/656 YCbCr
4:2:2 8-bit input timing
PCLK
Y1 Cb1 Y2 Cr1
DATA
time
Camera
Interface
Cr2
Y3 Cb2 Y4
32-bit
R G B
32-bit
2 1
16-bit
R 5 G 6 B 5
Figure 23-10. Memory storing style
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.
Y4 Y3 Y2 Y1 Y8
Little endian method
Y frame memory
Cb4 Cb3 Cb2 Cb1 Cb8 Cb7 Cb6 Cb5
Little endian method
Cb frame memory
Cr4 Cr3 Cr2 Cr1 Cr1
Little endian method
Cr frame memory
Cr1 Y2 Cb1 Y1 Cr2
Little endian method
YCbCr 4:2:2 interleave memory
RGB1RGB2RGB3RGB4RGB4RGB6RGB7RGB8
RGB frame memory
(24-bit)
RGB2/1 RGB4/3 RGB6/5 RGB8/7 RGB10/9 RGB12/11 RGB14/13 RGB16/15
RGB frame memory
(16-bit)
CAMERA INTERFACE
Y7 Y6 Y5
Cr7 Cr6 Cr5
Y4 Cb2 Y3
23-9