adv7152 Analog Devices, Inc., adv7152 Datasheet - Page 14

• Manufacturer Part Number: adv7152
• Description: Cmos 220 Mhz True-color Graphics Triple 10-bit Video Ram-dac
• Manufacturer: Analog Devices, Inc.

ADV7152
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).
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).
This mode allows for the display of 15-bit True-Color Images.
PIXEL DATA
PIXEL DATA
Figure 21. 15-Bit to 30-Bit True-Color Configuration
Figure 22. 15-Bit to 24-Bit True-Color Configuration
15-BIT
15-BIT
5
5
5
5
5
5
32 x 10
15-BIT TO 30-BIT
LOOK-UP-TABLE
15-BIT TO 24-BIT
LOOK-UP TABLE
32 x 8
RED
RED
GREEN
GREEN
32 x 10
32 x 8
32 x 10
32 x 8
BLUE
BLUE
COLOR DATA
COLOR DATA
10
10
10
8
8
8
30-BIT
24-BIT
GREEN DAC
GREEN DAC
BLUE DAC
BLUE DAC
RED DAC
RED DAC
10-BIT
10-BIT
10-BIT
8-BIT
8-BIT
8-BIT
ANALOG VIDEO
ANALOG VIDEO
OUTPUTS
OUTPUTS
RED
OUT
GREEN
OUT
BLUE
OUT
RED
OUT
GREEN
OUT
BLUE
OUT
–14–
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.
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 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.)
INPUT
PIXEL
DATA
R4
R3
R2
R1
R0
G4
G3
G2
G1
G0
B4
B3
B2
B1
B0
x
x
x
x
x
x
x
x
x
ASSIGN-
MENTS
PIN
R6
R5
R4
R3
R2
R1
R0
G6
G5
G4
G3
G2
G1
G0
B6
B5
B4
B3
B2
B1
B0
R7
G7
B7
LATCHED
PIXEL
DATA
PORT
R4
G4
G3
G2
G1
G0
B4
TO
R3
R2
R1
R0
B3
B2
B0
B1
x
x
x
x
x
x
x
x
x
INTERNALLY
TO 5 LSBS
SHIFTED
DATA
R4
R3
R2
R0
G4
G3
G2
G1
G0
B4
B3
B2
B1
B0
R1
0
0
0
0
0
0
0
0
0
5
5
5
DATA LATCHES
LOCATION "0"
LOCATION "0"
LOCATION "0"
256 x 10 RAM
256 x 10 RAM
(GREEN LUT)
256 x 10 RAM
LOCATIONS
(BLUE LUT)
(RED LUT)
LOCATION "31"
LOCATION "31"
LOCATION "31"
FIRST 32
OF RAM
10
10
10
TO
RED
DAC
TO
GREEN
DAC
TO
BLUE
DAC
REV. B