Datasheet
969
SAM9G15 [DATASHEET]
11052D–ATARM–31-Oct-12
When the color lookup mode is enabled the following restrictions apply on the horizontal and vertical window size:
Pixel striding is disabled when CLUT mode is enabled.
When YUV mode is enabled the following restrictions apply on the window size:
In RGB mode, there is no restriction on the line length.
44.6.3.4 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.
z CRKEY Field: enables the chroma keying and match logic.
z INV Field: performs bit inversion at pixel level.
z ITER2BL Field: when set the iterated data path is selected.
z ITER Field.
z REVALPHA Field: uses the reverse alpha value.
z GAEN Field: enables the global alpha value in the data path.
z LAEN Field: enables the local alpha value from the pixel.
z OVR Field: when set the overlay is selected as an input of the blender.
z DMA Field: the DMA data path is activated.
z REP Field: enables the bit replication to fill the 24-bit internal data path.
z DSTKEY Field: when set, Destination keying is enabled.
z GA Field: defines the global alpha value.
44.6.3.5 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.
Table 44-8. Color Lookup Mode and Window Size
CLUT Mode x-y Size Requirement
1 bpp multiple of 8 pixels
2 bpp multiple of 4 pixels
4 bpp multiple of 2 pixels
8 bpp free size
Table 44-9. YUV Mode and Window Size
YUV Mode
x-y Requirement,
Scaling Turned Off
x-y Requirement,
Scaling Turned On
AYUV free size x-y size is greater than 5
YUV 4:2:2 packed xsize is greater than 2 pixels x-y size is greater than 5
YUV 4:2:2
semiplanar
xsize is greater than 2 pixels x-y size is greater than 5
YUV 4:2:2 planar xsize is greater than 2 pixels x-y size is greater than 5
YUV 4:2:0
semiplanar
xsize is greater that 2 pixels x-y size is greater than 5
YUV 4:2:0 planar xsize is greater than 2 pixels x-y size is greater than 5