參數(shù)資料
型號： 82C205
英文描述： Consumer IC
中文描述： 消費性IC
文件頁數(shù)： 20/47頁
文件大?。?/td> 460K
代理商： 82C205
Advance Information
82C205
912-1000-024
Page 16
Revision 1.0
4.4. Automatic Resolution Detection
The 82C205 monitors the horizontal and vertical syncs from the VGA and performs automatic polarity detection,
as well as determination of the horizontal sync frequency and the incoming image resolution. Changes in the
horizontal sync frequency and the input image resolution can be configured to prompt an interrupt when these
changes occur. The micro-controller can then read the system status and then re-program the 82C205
appropriately.
A fully programmable capture CRTC can be adjusted by the programmer to align with incoming data, based upon
the status information that the 82C205 provides.
4.5. TV Mode
The 82C205 chip can be used to turn the LCD monitor into a TV monitor. If the system design for the monitor
includes a TV input and NTSC/PAL decoder, then the 82C205 can enable the flat panel to display television
signals. Both 16- and 8-bit interfaces to TV decoders are supported, which offers the designer the flexibility of
using a less expensive decoder. The 82C205 requires an ODD/EVEN flag as its vertical sync, and the HREF
signal as its horizontal sync.
4.6. Full Scale and Centering Options
Scaling is always an important issue for multi-sync monitors, so the 82C205 uses high quality filters to perform
image scaling, both horizontally and vertically. Even low resolution images, such as the output from a TV decoder,
can be displayed at the full panel resolution. A “centering” option also allows for a smaller resolution image to be
displayed on a larger panel with its original resolution surrounded by a black border.
4.7. Contrast/Brightness Control
Contrast and brightness are adjusted digitally on the 82C205, with built in clamping to prevent overflow and
underflow. The contrast and brightness controls exist for each color component separately (R-G-B), so color
weighting can also be performed by adjusting the contrast of each component to give a component a certain
weight relative to the other color components.
R
o
G
o
B
o
=
R
i
* Contrast
R
+ Brightness
R
G
i
* Contrast
G
+ Brightness
G
B
i
* Contrast
B
+ Brightness
B
=
=
4.8. On Screen Display
The 82C205 supports 8 color OSD. Using the attribute control of the 82C205, the programmer is able to build on-
screen menus with transparency, translucency, video inversion, and blinking special effects.
The OSD region on the display is defined as a rectangular region. The rectangular region’s size and location on
the display are controlled by programmable registers, so the OSD can be of any size, and be located at any
coordinate on the display.
The micro-controller writes the bitmap data for the rectangular OSD region to a DRAM buffer. The OSD data in the
DRAM buffer contains a 4-bit index into a Color Look Up Table (CLUT) register which is internal to the 82C205
and is also programmable by the micro-controller.
The CLUT contains 16 entries each using 6 bits to describe a 3-bit RGB color value, a 2-bit attribute value to
control the overlay graphics, and a 1-bit alpha blend value to control the global alpha value or translucency of the
of the overlay graphics. Figure 3 illustrates the organization of the CLUT.
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