Frame Memory Hierarchy - Samsung S5PC110 Manual

S5PC110_UM

2.7.3 FRAME MEMORY HIERARCHY

Frame memory consists of four ping-pong memories for output DMA ports. Also, ping-pong memory consists of
three element memories, namely, luminance Y, chrominance Cb, and chrominance Cr. It is recommended that the
arbitration priority of CAMIF must be higher than any other masters (except LCD controller). It is highly
recommended to set the CAMIF priorities as fixed priorities, not rotation priorities.
In case of multi-AHB bus, the priority of system bus (including CAMIF) must be higher than others. If the bus traffic
is so heavy that a DMA operation cannot complete for one horizontal period plus blank, it might result in mal-
functioning. Therefore, the priority of CAMIF must be changed to other round robin or circular arbitration priorities.
It is recommended that the bus that includes CAMIF should have a higher priority than any other buses in the
memory matrix system. The CAMIF should not be the default master of AMBA system.
Image
Data
Camera Interface
Figure 2-12
Bus &
Memorycontroller
Ping-pong Memory Hierarchy
2 1BCAMERA INTERFACE
4-pingpong
Frame memory
(SDRAM)
Address Y1 / RGB1
Address Cb1
Address Cr1
Address Y2 / RGB2
Address Cb2
Address Cr2
Address Y3 / RGB3
Address Cb3
Address Cr3
Address Y4 / RGB4
Address Cb 4
Address Cr 4
2-14