RIVA128 datasheet(51/77 Pages) STMICROELECTRONICS

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128-BIT 3D MULTIMEDIA ACCELERATOR

RIVA 128

51/77

DISPLAY INTERFACE

11.1 PALETTE-DAC

The Palette-DAC integrated into the RIVA 128

supports a traditional pixel pipeline with the follow-

ing enhancements:

• Support for 10:10:10, 8:8:8, 5:6:5 and 5:5:5 di-

rect color pixel modes

• Support for dynamic gamma correction on a

pixel by pixel basis

• Support for mixed indexed color and direct col-

or pixels

• 256 x 24 LUT for 8-bit indexed modes

• High quality video overlay

- Accepts interlaced video fields allowing a re-

duction in memory buffering requirements while

incorporating temporal averaging

- Line buffer for horizontal and vertical interpola-

tion of video streams up to square pixel PAL

resolution

- 3x2 multitap interpolating filter with image

sharpening

- Color key in all color pixel modes

- High quality YUV to RGB conversion with

chrominance control.

11.2 PIXEL MODES SUPPORTED

8-bit indexed color

In the 8-bit indexed color each 32-bit word contains four 8-bit indexed color pixels, each comprising bits

b[7:0] as shown below.

NOTE

This 32-bit representation can be extended to 64-bit and 128-bit widths by duplicating the 32-bit word in little-endian format.

16-bit direct color modes (5:6:5 direct and 5:5:5 with and without gamma correction)

In 5:5:5 color modes bit 15 of each pixel can be enabled to select whether pixel data bypasses the LUT to

feed the DACs directly, or indirectly, through the LUT, to allow gamma correction to be applied. If not en-

abled then the bypass mode will always be selected, and the LUT powered down. The 16-bit modes in-

clude a 5:6:5 format which always bypasses the LUT.

NOTE

This 32-bit representation can be extended to 64-bit and 128-bit widths by duplicating the 32-bit word in little-endian for-

mat.

32-bit direct color (8:8:8 with gamma correction or 10:10:10 direct)

In 32-bit color mode bit 31 of each pixel selects whether pixel data bypasses the LUT, to feed the DACs

directly or indirectly, through the LUT, to allow gamma correction to be applied. In the table below the Red,

Green and Blue bypass bits are shown individually as R[9:0], G[9:0], and B[9:0] because, in the bypass

Pixel formats (FBD[31:0])

31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9

Pixel 3Pixel 2Pixel 1Pixel 0

b7 b6 b5 b4 b3 b2 b1 b0 b7 b6 b5 b4 b3 b2 b1 b0 b7 b6 b5 b4 b3 b2 b1 b0 b7 b6 b5 b4 b3 b2 b1 b0

5:6:5

mode

Pixel formats (FBD[31:0])

Pixel 1

Pixel 0

31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 98

7654

3210

Red gamma

Green gamma

Blue gamma

Red gamma

Green gamma

Blue gamma

Red bypass

Green bypass

Blue bypass

Red bypass

Green bypass

Blue bypass

Red bypass

Green bypass

Blue bypass

Red bypass

Green bypass

Blue bypass

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