ADV7150LS85 datasheet(16/36 Pages) AD

16 / 36 page

ADV7150

–16–

REV. A

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-BIT

RED DAC

10-BIT

BLUE DAC

RED

32 x 10

GREEN

32 x 10

BLUE

32 x 10

10-BIT

GREEN DAC

RED

OUT

GREEN

OUT

BLUE

OUT

15-BIT

COLOR DATA

15-BIT TO 30-BIT

LOOK-UP TABLE

30-BIT

COLOR DATA

ANALOG VIDEO

OUTPUTS

Figure 23. 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

output of the RAM drives the DACs with 24-bit data (8 bits

each for Red, Green and Blue).

8-BIT

RED DAC

8-BIT

BLUE DAC

RED

32 x 8

GREEN

32 x 8

BLUE

32 x 8

8-BIT

GREEN DAC

RED

OUT

GREEN

OUT

BLUE

OUT

15-BIT

COLOR DATA

15-BIT TO 24-BIT

LOOK-UP TABLE

24-BIT

COLOR DATA

ANALOG VIDEO

OUTPUTS

Figure 24. 15-Bit to 24-Bit True-Color Configuration

PIXEL

INPUT

DATA

LOCATION "0"

LOCATION "31"

256 x 10

RAM

(RED LUT)

RED

DAC

LOCATION "0"

LOCATION "31"

256 x 10

RAM

(GREEN LUT)

GREEN

DAC

LOCATION "0"

LOCATION "31"

256 x 10

RAM

(BLUE LUT)

BLUE

DAC

ASSIGN-

MENTS

DATA

LATCHED

PIXEL

PORT

DATA LATCHES

FIRST 32

LOCATIONS

OF RAM

DATA

INTERNALLY

SHIFTED

TO 5 LSBS

Figure 25. 15-Bit True-Color Mapping Using R3–R7,

G3–G7 and B3–B7

This mode allows for the display of 15-bit True-Color Images.

PIXEL PORT MAPPING

The pixel data to the ADV7150 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.

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.

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