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參數(shù)資料
| 型號： | ADV7152 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | CMOS 220 MHz True-Color Graphics Triple 10-Bit Video RAM-DAC(三通道,10位視頻RAM-D/A轉換器) |
| 中文描述： | 220兆赫的CMOS真彩色圖形三路10位顯存，數(shù)模轉換器（三通道，10位視頻RAM的的D / A轉換器） |
| 文件頁數(shù)： | 6/32頁 |
| 文件大?。?/td> | 322K |
| 代理商： | ADV7152 |
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ADV7152
–14–
REV. B
This mode allows for the display of 256 simultaneous colors out
of a total palette of millions of addressable colors.
15-Bit “Gamma” True Color
(CR24, CR25, CR26, CR27 = 0, 0, 1, 1 or 1, 0, 1, 1 and
MR11 = 1)
The part is set to 15-bit True-Color operation. The pixel port
accepts 15 bits of color data which is mapped to the 5 LSBs of
each of the red, green and blue palettes of the Look-Up Table
RAM. The Look-Up Table is configured as a 32 location by 30
bits deep RAM (10 bits each for Red, Green and Blue). The
output of the RAM drives the DACs with 30-bit data (10 bits
each for Red, Green and Blue).
10
RED
32 x 10
GREEN
32 x 10
BLUE
32 x 10
10-BIT
GREEN DAC
10
5
15-BIT
PIXEL DATA
15-BIT TO 30-BIT
LOOK-UP-TABLE
30-BIT
COLOR DATA
ANALOG VIDEO
OUTPUTS
RED
OUT
GREEN
OUT
BLUE
OUT
10-BIT
BLUE DAC
10-BIT
RED DAC
5
Figure 21. 15-Bit to 30-Bit True-Color Configuration
This mode allows for the display of 15-bit, Gamma-Corrected
True-Color Images.
15-Bit “Standard” True Color
(CR24, CR25, CR26, CR27 = 0, 0, 1, 1 or 1, 0, 1, 1 and
MR11 = 0)
The part is set to 15-bit True-Color operation. The pixel port
accepts 15 bits of color data which is mapped to the 5 LSBs of
each of the red, green and blue palettes of the Look-Up Table
RAM. The Look-Up Table is configured as a 32 location by 24
bits deep RAM (8 bits each for Red, Green and Blue). The out-
put of the RAM drives the DACs with 24-bit data (8 bits each
for Red, Green and Blue).
8
RED
32 x 8
GREEN
32 x 8
BLUE
32 x 8
8-BIT
GREEN DAC
8
5
15-BIT
PIXEL DATA
15-BIT TO 24-BIT
LOOK-UP TABLE
24-BIT
COLOR DATA
ANALOG VIDEO
OUTPUTS
RED
OUT
GREEN
OUT
BLUE
OUT
8-BIT
BLUE DAC
8-BIT
RED DAC
5
Figure 22. 15-Bit to 24-Bit True-Color Configuration
This mode allows for the display of 15-bit True-Color Images.
PIXEL PORT MAPPING
The pixel data to the ADV7152 is automatically mapped in the
parts pixel port as determined by the pixel data mode pro-
grammed (Bits CR24–CR27 of Command Register 2).
Pixel data in the 24-bit True-Color modes is directly mapped to
the 24 color inputs R0–R7, G0–G7 and B0–B7.
PIXEL
INPUT
DATA
PIN
ASSIGN-
MENTS
DATA
LATCHED
TO
PIXEL
PORT
DATA LATCHES
FIRST 32
LOCATIONS
OF RAM
DATA
INTERNALLY
SHIFTED
TO 5 LSBS
B7
B6
B5
B4
B3
B2
B1
B0
10
TO
BLUE
DAC
0
B4
B3
B2
B1
B0
B4
B3
B2
B1
B0
x
B4
B3
B2
B1
B0
LOCATION "0"
LOCATION "31"
256 x 10 RAM
(BLUE LUT)
TO
RED
DAC
R7
R6
R5
R4
R3
R2
R1
R0
10
0
R4
R3
R2
R1
R0
R4
R3
R2
R1
R0
x
256 x 10 RAM
(RED LUT)
LOCATION "0"
LOCATION "31"
x
R4
R3
R2
R1
R0
TO
GREEN
DAC
G4
G3
G2
G1
G0
G7
G6
G5
G4
G3
G2
G1
G0
10
0
G4
G3
G2
G1
G0
x
G4
G3
G2
G1
G0
256 x 10 RAM
(GREEN LUT)
LOCATION "0"
LOCATION "31"
5
Figure 23. 15-Bit True-Color Mapping Using R3–R7, G3–G7
and B3–B7
There are three modes of operation for 8-bit Pseudo Color.
Each mode maps the input pixel data differently. Data can be
input to one of the three color channels, R0–R7 or G0–G7 or
B0–B7.
The part has two modes of operation for 15-bit True Color. In
the first mode, data is input to the device over the red, green
and blue channel (R3–R7, G3–G7 and B3–B7) and is internally
mapped to locations 0 to 31 of the Look-Up Table (LUT) ac-
cording to Figure 23. In the second mode, data is input to the
device over just two of the color ports, red and green (R0–R7
and G0–G6) and is internally mapped to LUT locations 0 to 31
according to Figure 24. (Note: Data on unused pixel inputs is
ignored.)
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相關代理商/技術參數(shù) |
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|---|---|
| adv7152es | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Analog Devices 功能描述: |
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