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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(zhuǎn)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(zhuǎn)換器（三通道，10位視頻RAM的的D / A轉(zhuǎn)換器） |
| 文件頁數(shù)： | 5/32頁 |
| 文件大?。?/td> | 322K |
| 代理商： | ADV7152 |
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ADV7152
–13–
REV. B
Pipeline Delay and On-Board Calibration
The ADV7152 has a fixed number of pipeline delays (tPD), so
long as timings t10 and
τ-t
11 are met. However, if a fixed pipeline
delay is not a requirement, timings t10 and τ-t11 can be ignored,
a calibration cycle must be run and there is no restriction on
LOADIN to LOADOUT timing. If timings t10 and
τ-t
11 are not
met, the part will function correctly though with an increased
number of pipeline delays, tPD + N CLOCKS (for 2:1 mode
N = 2, for 1:1 mode N = 0). The ADV7152 has onboard cali-
bration circuitry which synchronizes pixel data and LOADIN
with the internal ADV7152 clocking signals. Calibration can be
performed in two ways: during the devices initialization se-
quence by toggling two bits of the Mode Register, MR10 fol-
lowed by MR15, or by writing a “1” to Bit CR10 of Command
Register 1 which executes a calibration on every Vertical Sync.
COLOR VIDEO MODES
The ADV7152 supports a number of color video modes, all at
the maximum video rate. Command bits CR24–CR27 of Com-
mand Register 2 along with Bit MR11 of Mode Register 1 deter-
mine the color mode.
24-Bit “Gamma” True Color
(CR25, CR26, CR27 = 1, 1, 1 and MR11 = 1)
The part is set to 24-bit/30-bit True-Color operation. The pixel
port accepts 24 bits of color data which is directly mapped to
the Look-Up Table RAM. The Look-Up Table is configured as
a 256 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). The RAM is
preloaded with a user determined, nonlinear function such as a
gamma correction curve.
10
RED
256 x 10
GREEN
256 x 10
BLUE
256 x 10
10-BIT
GREEN DAC
10
8
24-BIT
PIXEL DATA
24-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
8
Figure 17. 24-Bit to 30-Bit True-Color Configuration
This mode allows for the display of full 24-bit, Gamma-
Corrected True-Color Images.
24-Bit “Standard” True Color
(CR25, CR26, CR27 = 1, 1, 1 and MR11 = 0)
This mode sets the part into direct 24-bit True-Color operation.
The pixel port accepts 24 bits of color data which is directly
mapped to Look-Up Table RAM. The Look-Up Table is con-
figured as a 256 location by 24 bits deep RAM (8 bits each for
Red, Green and Blue) and essentially acts as a bypass RAM.
The output of the RAM drives the DACs with 24-bit data (8
bits each for Red, Green and Blue). The RAM is preloaded with
a linear function.
This mode allows for the display of full 24-bit True-Color
Images.
8
RED
256 x 8
GREEN
256 x 8
BLUE
256 x 8
8-BIT
GREEN DAC
8
24-BIT
PIXEL DATA
24-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
8
Figure 18. 24-Bit to 24-Bit Direct True-Color Configuration
8-Bit “Gamma” Pseudo Color
(CR25, CR26, CR27 = X, 0, 0 or X, 1, 0 or X, 0, 1 and
MR11 = 1)
This mode sets the part into 8-bit Pseudo-Color operation. The
pixel port accepts 8 bits of pixel data which indexes a 30-bit
word in the Look-Up Table RAM. The Look-Up Table is con-
figured as a 256 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
256 x 10
GREEN
256 x 10
BLUE
256 x 10
10-BIT
GREEN DAC
10
8
8-BIT
PIXEL DATA
8-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
Figure 19. 8-Bit to 30-Bit Pseudo-Color Configuration
This mode allows for the display of 256 simultaneous colors out
of a total palette of millions of addressable colors.
8-Bit “Standard” Pseudo Color
(CR25, CR26, CR27 = X, 0, 0 or X, 1, 0 or X, 0, 1 and
MR11 = 0)
This mode sets the part into 8-bit Pseudo-Color operation. The
pixel port accepts 8 bits of pixel data which indexes a 24-bit
word in the Look-Up Table RAM. The Look-Up Table is con-
figured as a 256 location by 24 bits deep RAM (10 bits each for
Red, Green and Blue). The output of the RAM drives the
DACs with 24-bit data (8 bits each for Red, Green and Blue).
8
RED
256 x 8
GREEN
256 x 8
BLUE
256 x 8
8-BIT
GREEN DAC
8
8-BIT
PIXEL DATA
8-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
Figure 20. 8-Bit to 24-Bit Pseudo-Color Configuration
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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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