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PRELIMINARY
S3C6400X RISC MICROPROCESSOR
CAMERA INTERFACE
20-9
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.
FRAME MEMORY HIERARCHY
Frame memories consist of four ping-pong memories for each P-ports and C-ports. Ping-pong memories have
three element memories that are luminance Y, chrominance Cb, and chrominance Cr. It is recommended that the
arbitration priority of CAMERA INTERFACE must be higher than any other masters except LCD controller. It is
strongly recommended that CAMERA INTERFACE priorities must be the fixed priorities, instead of rotation
priorities.
I
n multi-AHB bus case, the priority of system bus including CAMERA INTERFACE must be higher than
others. If AHB-bus is traffic enough that DMA operation is not ending during one horizontal period plus blank, it
might be entered into mal-function. Therefore, the priority of CAMERA INTERFACE must be separated to other
round robin or circular arbitration priorities. It is also recommended that AHB bus which includes CAMERA
INTERFACE, must have higher priority than any other multi-AHB buses in memory matrix system. CAMERA
INTERFACE must not be the default master of AMBA AHB system.
C-port Y 1 / RGB 1
C-port Cb 1
C-port Cr 1
C-port Y 2 / RGB 2
C-port Cb 2
C-port Cr 2
C-port Y 3 / RGB 3
C-port Cb 3
C-port Cr 3
C-port Y 4 / RGB 4
C-port Cb 4
C-port Cr 4
4-pingpong
Frame memory
(SDRAM)
ITU-601/656
YCbCr
4:2:2
8-bits
Camera Interface
AHB bus &
Memorycontroller
P-port
YCbCr
4:2:0,2
RGB
C-port
YCbCr
4:2:0,2
RGB
P-port Y 1 / RGB 1
P-port Cb 1
P-port Cr 1
P-port Y 2 / RGB 2
P-port Cb 2
P-port Cr 2
P-port Y 3 / RGB 3
P-port Cb 3
P-port Cr 3
P-port Y 4 / RGB 4
P-port Cb 4
P-port Cr 4
Figure 20-8. Ping-pong memory hierarchy