參數(shù)資料
型號(hào): TVP3010C
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): 44/90頁
文件大?。?/td> 491K
代理商: TVP3010C
2–28
direct-color modes that do not have overlay capability. Color-key switching involving VGA can be performed
in all direct-color modes where the multiplex ratio is 1:1 (see Table 2 – 6). When the VGA port is activated
(MCR2 bit 7 = 1), the OL/VGA-register (low, high) color comparison is performed on VGA data and the VGA
port is color-key switched instead of overlayed.
The windowing and color-key switching functions are integrated much like a logical OR function. When
either of the functions switches to palette graphics (VGA or overlay through the palette RAM), palette
graphics are displayed instead of direct color. Therefore, when programming the device for any direct-color
mode, both the color-key control and auxiliary-window registers must be set such that direct-color graphics
are displayed. For true color (gamma-corrected through the palette), one of the functions must be set to
palette graphics.
All of the switching functions can be performed using self-clocked or externally clocked frame-buffer
interface timing. Externally clocked timing allows all pixel port and VGA port timing to be referenced to CLK0
externally but can only be used for multiplex ratios of 1:1. When externally clocked timing is used, it is
recommended that the VGA Blank signal also be utilized (see subsection 2.3.2 for specific details on
clocking). All switching involving the VGA port can only be used with a 1:1 multiplex ratio.
2.6.1
The TVP3010C and the TVP3010M palettes support several windowing formats. These are specified by the
auxiliary-control register bits 0–2 and PSEL as shown below.
Windowing Control
Window context switching is determined by equation 1:
switch = [(PSEL
×
ACR2) + (window
×
ACR1)]
ACR0
where:
window = 1 inside the auxiliary window.
ACRnis the nth bit of the auxiliary-control register.
(1)
Table 2–15 then applies.
Table 2–15. Windowing Control
MULTIPLEX MODE SELECTED
DISPLAY RESULT
SWITCH = 0
direct color
SWITCH = 1
VGA
direct color with VGA
direct color
direct color
overlay
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