Samsung S3C6400X User Manual page 574

S3C6400X RISC MICROPROCESSOR
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. In 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.
ITU-601/656
YCbCr
4:2:2
8-bits
P-port
YCbCr
4:2:0,2
RGB
Camera Interface
C-port
YCbCr
4:2:0,2
RGB
Figure 20-8. Ping-pong memory hierarchy
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.
AHB bus &
Memorycontroller
CAMERA INTERFACE
4-pingpong
Frame memory
(SDRAM)
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
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
20-9