
On-Screen Display
9-27
MIX[3:0]
Mix Weight
The value written into MIX[3:0] sets the mix ratio between
the foreground (overlay) pixels and the background
(reconstructed picture) pixels in increments of 1/16 of the
pixel value. If Mix Weight is zero, the output pixel is
weighted 100% reconstructed picture and 0% OSD. If Mix
Weight is 15, the output is 15/16 OSD and 1/16
reconstructed picture. This can be enabled or disabled for
each color in the palette (see Mix Enable in the next
section).
Word 1 [15:12]
BMP ONLY
Bitmap Only
This bit is set to indicate that the OSD header does not
contain a color palette and the existing color palette
should be used.
Word 1 Bit 10
ENDR[8:0]
OSD End Row
The line number as an offset from the new field time on
which this OSD area ends is written into this field.
Word 1 [8:0]
STARTC[9:0] OSD Start Column
The column number in pixels as an offset from the
horizontal sync on which this OSD area begins is written
into STARTC[8:0].
Word 2 [9:0]
ENDC[9:0]
OSD End Column
The column number in pixels on which this OSD area
ends is written into ENDC[9:0].
[9:0]
9.9.2.3 OSD Palette Color Fields
The 16-bit color fields, COL0 through COL15 or COL256, are formatted
as shown in
Figure 9.15
.
Figure 9.15 OSD Header Color Fields
Y[5:0]
Luminance
Y contains the luminance value with ITU-R BT.601
chromaticity. This value is multiplied by four before being
used by the OSD controller.
[15:10]
15
10
9
8
7
4
3
0
Y[5:0]
R
MIX
Cb[3:0]
Cr[3:0]