STV3550B STMicroelectronics, STV3550B Datasheet - Page 45
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STV3550B
Manufacturer Part Number
STV3550B
Description
Manufacturer
STMicroelectronics
Datasheet
1.STV3550B.pdf
(145 pages)
Specifications of STV3550B
Operating Temperature (min)
0C
Operating Temperature (max)
70C
Operating Temperature Classification
Commercial
Mounting
Surface Mount
Lead Free Status / Rohs Status
Compliant
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STV3550
Figure 31. OSD region positions
Note:
Hsync
Vsync
Color characteristics
The address in the OSD color look-up-table (CLUT) (not in the SDRAM), where the color
defined in the palette of the current specification and pointed to by Palettep[31:0] will be
loaded, is defined in bits CLUTAdd[7:0]. If the New Palette bit is reset, these bits are
ignored.
The number of colors which will be loaded in the OSD CLUT is defined in bits NCL[7:0]. The
OSD CLUT can contain up to 256 colors. For more information, refer to
When NCL[7:0] = 00h, one color will be loaded.
Each region may have its own palette, with its own number of colors (these colors will be
loaded in the OSD CLUT before displaying the bitmap). If a sequence of regions uses the
same palette, the palette need only be defined in the first region of the sequence. If a region
only uses a part of the colors defined in the palette of the previous region, the unused colors
from the previous palette can be reprogrammed for the current region in the OSD CLUT.
Mixing characteristics
Four different modes may be applied to RGB components for mixing OSD and video signals:
Pixel Mixing mode, Global Mixing mode (mixing factor defined in Mix-Weight bits),
Proportional Mixing mode (mixing factor defined in Mix-Gain bits) and No Mixing mode (full
OSD). The mixing mode is specified in bits MiMo[1:0]. For more information, refer to
Section
Filter mode
Flicker problems may occur inside an OSD when there is a significant difference in the color
between pixels in a top line and those of its surrounding bottom lines (e.g. if one object is
visible in one line and not in its surrounding lines).
Vertical Shift “X” TV lines
N’ TV lines
4.1.5.
Horizontal Shift
X_left
N Pixel Clock Periods
OSD Region
Y_top
Y_Bottom
Graphics functional description
X_right
Color
data.
TV Screen
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