![](http://datasheet.mmic.net.cn/100000/ID80C32E-L16SHXXX_datasheet_3493627/ID80C32E-L16SHXXX_1092.png)
1092
SAM9X35 [DATASHEET]
11055E–ATARM–10-Mar-2014
46.6.3.4 Overlay Blender Attributes
When two or more video layers are used, alpha blending is performed to defined the final image displayed. Each window
has its own blending attributes.
CRKEY Field: enables the chroma keying and match logic.
INV Field: performs bit inversion at pixel level.
ITER2BL Field: when set the iterated data path is selected.
ITER Field.
REVALPHA Field: uses the reverse alpha value.
GAEN Field: enables the global alpha value in the data path.
LAEN Field: enables the local alpha value from the pixel.
OVR Field: when set the overlay is selected as an input of the blender.
DMA Field: the DMA data path is activated.
REP Field: enables the bit replication to fill the 24-bit internal data path.
DSTKEY Field: when set, Destination keying is enabled.
GA Field: defines the global alpha value.
46.6.3.5 Window Attributes Software Operation
1.
When required, write the overlay attributes configuration registers.
2.
Set UPDATEEN field of the CHXCHER register.
3.
Poll UPDATESR field in the CHXCHSR, the update applies when that field is reset.
46.6.4 RGB Frame Buffer Memory Bitmap
46.6.4.1 1 bpp Through Color Lookup Table
46.6.4.2 2 bpp Through Color Lookup Table
46.6.4.3 4 bpp Through Color Lookup Table
46.6.4.4 8 bpp Through Color Lookup Table
Table 46-10. 1 bpp memory mapping, little endian organization
Mem addr 0x3
0x2
0x1
0x0
Bit
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 987
6543
210
Pixel 1 bpp p31 p30 p29 p28 p27 p26 p25 p24 p23 p22 p21 p20 p19 p18 p17 p16 p15 p14 p13 p12 p11 p10 p9 p8 p7 p6 p5 p4 p3 p2 p1 p0
Table 46-11. 2 bpp memory mapping, little endian organization
Mem addr 0x3
0x2
0x1
0x0
Bit
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 987
6543
210
Pixel 2 bpp
p15
p14
p13
p12
p11
p10
p9
p8
p7
p6
p5
p4
p3
p2
p1
p0
Table 46-12. 4 bpp memory mapping, little endian organization
Mem addr 0x3
0x2
0x1
0x0
Bit
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 987
6543
210
Pixel 4 bpp
p7
p6
p5
p4
p3
p2
p1
p0
Table 46-13. 8 bpp memory mapping, little endian organization
Mem addr 0x3
0x2
0x1
0x0
Bit
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 987
6543
210
Pixel 8 bpp
p3
p2
p1
p0