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參數(shù)資料
| 型號： | TVP3025-135 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | Video Interface PALETTE(三PLL，視頻接口調(diào)色器) |
| 中文描述： | 視頻接口盒（三鎖相環(huán)，視頻接口調(diào)色器） |
| 文件頁數(shù)： | 46/99頁 |
| 文件大小： | 663K |
| 代理商： | TVP3025-135 |
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2–32
When both the 64 x 64 user-definable cursor and the crosshair cursor are enabled, cursor-control register
bit 5 specifies the display at the intersection of the crosshair cursor and the 64
×
64 user-definable cursor.
The following cursor intersection truth table details the results of all cursor color combinations; see
Section 2.3.18.3 for specific cursor-control register bit definitions.
CROSSHAIR
64 x 64 CURSOR
CCR5 = 0
CCR5 = 1
Color 0
Transparent
Color 0
Color 0
Color 1
Transparent
Color 1
Color 1
Color 0
Complement
Color 0
Color 0
Color 1
Complement
Color 1
Color 1
Color 0
Color 0
Color 0
Transparent
Color 1
Color 0
Color 1
Transparent
Color 0
Color 1
Color 0
Complement
Color 1
Color 1
Color 1
Complement
2.3.10
The TVP3025 provides three integrated mechanisms for switching between VGA or overlay images and
direct-color images midscreen. The auxiliary window function supports the display of overlay or VGA
graphics into a specified window on the screen when in a direct-color mode. The same window registers
used to define the crosshair cursor window are used to define the auxiliary window start and window stop
(see Sections 2.3.18.6 and 2.3.18.7). One application of this function is to fit a VGA picture in the middle
of a direct-color display. The port-select function utilizes an external terminal (PSEL) to switch between VGA
or overlay and direct-color on a pixel-by-pixel basis, enabling the generation of multiple VGA or overlay
windows on a direct-color screen.
Auxiliary Window, Port Select, and Color-Key Switching
The auxiliary-window and port-select functions are integrated so that they can be enabled simultaneously
or separately. They are only operable when in one of the direct-color modes, since both VGA and overlay
utilize the palette RAM. Overlay windowing is not supported for those direct-color modes that do not have
overlay capability. If VGA windowing is to be performed, multiplex-control register 2 needs to have bit 7 set
to a logic 1 (activating the VGA port) and the appropriate direct-color mode must be chosen with the
remaining multiplex-control register bits. When the VGA port is activated (MCR2 bit 7 = 1), the overlay is
disabled.
The auxiliary-window and port-select functions are controlled by the auxiliary-control register, which is
programmed through the indirect register map (29 hex, see Section 2.3.18.11 for register bit definitions).
Like the crosshair cursor window, for auxiliary graphics to be displayed, both the window-start and window-
stop registers must contain locations on the active screen. If full-screen auxiliary graphics is desired, the
window-start (x,y) registers should contain 0000 (hex) and the window-stop (x,y) registers should be set to
the last active pixel location. The window-start registers can be programmed with a location off the active
screen to temporarily remove the auxiliary window without disabling the function entirely.
The color-key switching function allows switching between VGA or overlay and direct-color on a
pixel-by-pixel basis by comparing the incoming VGA/overlay and direct-color data with user-programmable
color-key ranges. The color-key ranges are set by writing to the eight 8-bit color-key range registers:
color-key red (low, high), color-key green (low, high), color-key blue (low, high), and color-key OL/VGA (low,
high). The color-key switching function is controlled by the color-key-control register (see Section 2.3.9.2)
All of the registers can be programmed through the indirect register map. When the VGA port is activated
(MCR2 bit 7 = 1), the color-key OL/VGA register (low, high) color comparison is performed on VGA data
and the VGA port is color-key switched instead of overlay.
The windowing and color-key switching functions are integrated much like a logical OR function. If either
of the functions switches to palette graphics (VGA or overlay through the palette RAM), palette graphics are
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| TVP3025-175 | Video Interface PALETTE(三PLL，視頻接口調(diào)色器) |
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| TVP3025-135PCE | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Video Interface Palette |
| TVP3025-175PCE | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Video Interface Palette |
| TVP3025-220MDN | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Video Interface Palette |
| TVP3025-220PCE | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Video DAC with Color Palette (RAMDAC) |
| TVP3026 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Video Interface Palette |
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