Datasheet

1003
SAM9263 [DATASHEET]
Atmel-6249N-ATARM-SAM9263-Datasheet_14-Mar-16
Figure 45-6. Three Frame Buffers Application and Memory Mapping
45.3.5 Codec Path
45.3.5.1 Color Space Conversion
Depending on user selection, this module can be bypassed so that input YCrCb stream is directly connected to the
format converter module. If the RGB input stream is selected, this module converts RGB to YCrCb color space
with the formulas given below:
An example of coefficients are given below:
45.3.5.2 Memory Interface
Dedicated FIFO are used to support packed memory mapping. YCrCb pixel components are sent in a single 32-bit
word in a contiguous space (packed). Data is stored in the order of natural scan lines. Planar mode is not
supported.
45.3.5.3 DMA Features
Unlike preview datapath, codec datapath DMA mode does not support linked list operation. Only the
CODEC_DMA_ADDR register is used to configure the frame buffer base address.
frame n frame n+1 frame n+2frame n-1 frame n+3 frame n+4
Frame Buffer 0
Frame Buffer 1
Frame Buffer 3
4:2:2 Image
Full ROI
ISI config Space
Codec Request
Codec Done
LCD
Memory Space
Y
C
r
C
b
C
0
C
1
C
2
C
3
C–
4
C–
5
C–
6
C–
7
C
8
R
G
B
×
Y
off
Cr
off
Cb
off
+=
Y 0.257 R⋅ 0.504 G 0.098 B 16+⋅+⋅+=
C
r
0.439 R⋅ 0.368 G⋅– 0.071 B 128+⋅–=
C
b
0.148 R⋅– 0.291 G 0.439 B 128+⋅+⋅–=




