L64105 LSI Logic Corporation, L64105 Datasheet - Page 319

• Manufacturer Part Number: L64105
• Description: Mpeg-2 Audio/video Decoder
• Manufacturer: LSI Logic Corporation

9.9.2.3 OSD Palette Color Fields
MIX[3:0]
BMP ONLY
ENDR[8:0]
STARTC[9:0] OSD Start Column
ENDC[9:0]
The 16-bit color fields, COL0 through COL15 or COL256, are formatted
as shown in
Figure 9.15 OSD Header Color Fields
Y[5:0]
On-Screen Display
15
Y[5:0]
Figure
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).
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.
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.
The column number in pixels as an offset from the
horizontal sync on which this OSD area begins is written
into STARTC[8:0].
OSD End Column
The column number in pixels on which this OSD area
ends is written into ENDC[9:0].
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.
9.15.
10
R
9
MIX
8
7
Cb[3:0]
4
3
Word 1 [15:12]
Word 1 Bit 10
Word 1 [8:0]
Word 2 [9:0]
Cr[3:0]
[15:10]
[9:0]
9-27
0