參數(shù)資料
型號: TVP3010M
廠商: Texas Instruments, Inc.
英文描述: Video Interface Palette
中文描述: 視頻接口面板
文件頁數(shù): 43/90頁
文件大?。?/td> 491K
代理商: TVP3010M
2–27
When both the 64
×
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 cursor-intersection truth table (Table 2–14) details the results of all cursor-color combinations; see
subsection 2.16.3 for specific cursor control register-bit definitions.
Table 2–14. Cursor Intersection Truth Table
CROSSHAIR
64
×
64 CURSOR
Transparent
CCR5 = 0
CCR5 = 1
Color 0
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
2.6
The TVP3010C as well as the TVP3010M palette provides three integrated mechanisms for switching
between VGA or overlay images and direct-color images in 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 subsections 2.16.6 and 2.16.7). 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. VGA-windowing and VGA-port selection are supported for all direct-color modes where
the multiplex ratio is 1:1 (see Table 2 – 6). When VGA windowing is to be performed, multiplex control
register 2 must have bit 7 set to 1 (activating the VGA port) and the appropriate direct-color mode must be
chosen with the remaining multiplexer control register bits. When the VGA port is activated (MCR2 bit 7 =
1), the overlay is disabled and horizontal zooming 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 subsection 2.16.11 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. When full-screen auxiliary graphics is desired,
the window start (X and Y) registers should contain 0000 (hex) and the window stop (X and Y) registers
should be set to the last active-pixel location. The window start register 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 subsection 2.6.2).
All of the registers can be programmed through the indirect register map (see subsections 2.16.12 and
2.16.13 for register-bit definitions). Color-key switching involving overlay is not supported for those
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