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參數(shù)資料
| 型號： | LM1246 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | 150 MHz I2C Compatible RGB Preamplifier with Internal 512 Character OSD ROM, 512 Character RAM and 4 DACs |
| 中文描述： | 150 MHz的I2C兼容的RGB前置放大器512個字符OSD光盤，512個字符RAM和4 DAC的內(nèi)置 |
| 文件頁數(shù)： | 22/51頁 |
| 文件大?。?/td> | 2794K |
| 代理商： | LM1246 |
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OSD Generator Operation
(Continued)
and background pixels in character two,
Color 2: Those that are foreground pixels in character two
and background pixels in character one,
Color 3: Those
that
are
foreground
characters.
In order to identify which pixels are which, both characters
should be drawn in one character cell using the same back-
ground color, and different background colors. In
Figure 19
,
both “A” and a “B” are drawn separately, then superimposed,
with the final 4 color character on the right. Comparing it to
the list of colors, it is seen that white is color 0, black is color
1, blue is color 2 and red is color 3. (These particular four
colors were chosen for clarity).
pixels
for
both
Figure 20
shows the composite four color character in the
center and the palette choices on the left and the right which
result in the display of the two original characters.
To display character 1, which has a foreground color 1,
character 2 must be hidden by setting its foreground color
(color 2) to equal the background. Color 3 (common pixels)
must be set to the desired foreground (color 1). In this case,
color 0 and color 2 are black and color 1 and color 3 are
white.
To display character 2, set color 1 = color 0 (to hide character
1) and color 3 = color 2. Other than this, there is no restric-
tion on the choice of the actual colors used.
ATTRIBUTE TABLES
Each character has an attribute value assigned to it in the
page RAM. The attribute value is 4 bits wide, making each
character entry in the page RAM 13 bits wide in total. The
attribute value acts as an address, which points to one of 16
entries in either the two-color attribute table RAM or the
four-color attribute table RAM. The attribute word in the table
contains the coding information which defines which color is
represented by color 0 and color 1 in the two color attribute
table and color 0, color 1, color 2, color 3 in the four-color
attribute table. Each color is defined by a 9-bit value, with 3
bits assigned to each channel of RGB. A dynamic look-up
table defines each of the 16 different color ’palettes’. As the
look-up table can be dynamically coded by the microcontrol-
ler over the I
2
C compatible interface, each color can be
assigned to any one of 2
9
(i.e. 512) choices. This allows a
maximum of 64 different colors to be used within one page
using the 4-color characters, with up to 4 different colors
within any one character and 32 different colors using the
2-color characters, with 2 different colors within any one
character.
TRANSPARENT DISABLE
In addition to the 9 lines of video data, a tenth data line is
generated by the transparent disable bit. When this line is
activated, the black color code will be translated as ‘trans-
20068532
FIGURE 19. Four Color Character as a 2 x 2 Color
20068533
FIGURE 20. Displaying Each Character Individually
L
www.national.com
22
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| LM1246NA | 150 MHz I2C Compatible RGB Preamplifier with Internal 512 Character OSD ROM, 512 Character RAM and 4 DACs |
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| LM124AJLQMLV | Low Power Quad Operational Amplifiers |
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LM1246AAA | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:150 MHz I2C Compatible RGB Preamplifier with Internal 512 Character OSD ROM, 512 Character RAM and 4 DACs |
| LM1246AAC/NA | 制造商:Rochester Electronics LLC 功能描述: 制造商:Texas Instruments 功能描述:IC 150MHZ RGB PREAMP 1246 DIP24 |
| LM1246AAC/NA/NOPB | 功能描述:IC PREAMP RGB 150MHZ 24-DIP RoHS:是 類別:集成電路 (IC) >> 線性 - 視頻處理 系列:- 產(chǎn)品變化通告:Product Discontinuation 07/Mar/2011 標準包裝:3,000 系列:OMNITUNE™ 類型:調(diào)諧器 應用:移動電話，手機，視頻顯示器 安裝類型:表面貼裝 封裝/外殼:65-WFBGA 供應商設備封裝:PG-WFSGA-65 包裝:帶卷 (TR) 其它名稱:SP000365064 |
| LM1246NA | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:150 MHz I2C Compatible RGB Preamplifier with Internal 512 Character OSD ROM, 512 Character RAM and 4 DACs |
| LM1247 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:150 MHz I2C Compatible RGB Preamplifier with Internal 512 Character OSD ROM, 512 Character RAM and 4 DACs |
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