Atmel Evaluation Kit AT91SAM9M10-G45-EK AT91SAM9M10-G45-EK Datenbogen
Produktcode
AT91SAM9M10-G45-EK
862
SAM9M10 [DATASHEET]
6355F–ATARM–12-Mar-13
39.4.5
Codec Path
39.4.5.1
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:
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 is given below:
39.4.5.2
Memory Interface
Dedicated FIFOs 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.
bit word in a contiguous space (packed). Data is stored in the order of natural scan lines. Planar mode is not
supported.
39.4.5.3
DMA Features
Like preview datapath, codec datapath DMA mode uses linked list operation.
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
+
⋅
+
⋅
–
=
⎩
⎪
⎨
⎪
⎧