ADV7152LS85 datasheet(14/32 Pages) AD

14 / 32 page

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).

RED

32 x 10

GREEN

32 x 10

BLUE

32 x 10

10-BIT

GREEN DAC

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

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).

RED

32 x 8

GREEN

32 x 8

BLUE

32 x 8

8-BIT

GREEN DAC

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

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

ASSIGN-

MENTS

DATA

LATCHED

PIXEL

PORT

DATA LATCHES

FIRST 32

LOCATIONS

OF RAM

DATA

INTERNALLY

SHIFTED

TO 5 LSBS

BLUE

DAC

LOCATION "0"

LOCATION "31"

256 x 10 RAM

(BLUE LUT)

RED

DAC

256 x 10 RAM

(RED LUT)

LOCATION "0"

LOCATION "31"

GREEN

DAC

256 x 10 RAM

(GREEN LUT)

LOCATION "0"

LOCATION "31"

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.)

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