ADV7150LS135 AD [Analog Devices], ADV7150LS135 Datasheet - Page 15

• Manufacturer Part Number: ADV7150LS135
• Description: CMOS 220 MHz True-Color Graphics Triple 10-Bit Video RAM-DAC
• Manufacturer: AD [Analog Devices]

Pipeline Delay and Onboard Calibration
The ADV7150 has a fixed number of pipeline delays (t
long as timings t
delay is not a requirement, timings t
a calibration cycle must be run and there is no restriction on
LOADIN to LOADOUT timing. If timings t
met, the part will function correctly though with an increased
number of pipeline delays, t
N = 4, for 2:1 mode N = 2, for 1:1 mode N = 0). The ADV7150
has onboard calibration circuitry which synchronizes pixel data and
LOADIN with the internal ADV7150 clocking signals. Calibra-
tion can be performed in two ways: during the devices initializa-
tion sequence by toggling two bits of the Mode Register, MR10
followed 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 ADV7150 supports a number of color video modes all at
the maximum video rate.
Command bits CR24–CR27 of Command Register 2 along with
Bit MR11 of Mode Register 1 determine 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.
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.
REV. A
COLOR DATA
Figure 19. 24-Bit to 30-Bit True-Color Configuration
24-BIT
8
8
8
LOOK-UP TABLE
24-BIT TO 30-BIT
256 x 10
10
RED
and -t
256 x 10
GREEN
256 x 10
BLUE
11
PD
are met. However, if a fixed pipeline
COLOR DATA
+ N CLOCKS (for 4:1 mode
10
10
10
30-BIT
10
GREEN DAC
BLUE DAC
and -t
RED DAC
10-BIT
10-BIT
10-BIT
10
ANALOG VIDEO
11
and -t
OUTPUTS
can be ignored,
11
PD
RED
OUT
GREEN
OUT
BLUE
OUT
are not
), so
–15–
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).
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).
This mode allows for the display of 256 simultaneous colors out
of a total palette of millions of addressable colors.
Figure 20. 24-Bit to 24-Bit Direct True-Color Configuration
COLOR DATA
Figure 21. 8-Bit to 30-Bit Pseudo-Color Configuration
Figure 22. 8-Bit to 24-Bit Pseudo-Color Configuration
8-BIT PIXEL
8
8-BIT PIXEL
8
24-BIT
8
8
8
DATA
DATA
LOOK-UP TABLE
24-BIT TO 24-BIT
LOOK-UP TABLE
256 x 8
LOOK-UP TABLE
8-BIT TO 30-BIT
8-BIT TO 24-BIT
256 x 10
RED
256 x 8
RED
RED
GREEN
256 x 8
256 x 10
GREEN
GREEN
256 x 8
256 x 8
BLUE
256 x 10
256 x 8
BLUE
BLUE
COLOR DATA
COLOR DATA
COLOR DATA
8
8
8
24-BIT
10
10
10
8
8
8
24-BIT
30-BIT
GREEN DAC
BLUE DAC
RED DAC
GREEN DAC
GREEN DAC
BLUE DAC
BLUE DAC
RED DAC
RED DAC
8-BIT
8-BIT
8-BIT
10-BIT
10-BIT
10-BIT
8-BIT
8-BIT
8-BIT
ANALOG VIDEO
ANALOG VIDEO
ADV7150
ANALOG VIDEO
OUTPUTS
OUTPUTS
OUTPUTS
RED
OUT
GREEN
OUT
BLUE
OUT
RED
OUT
GREEN
OUT
BLUE
OUT
RED
OUT
GREEN
OUT
BLUE
OUT