STG3000X-RIVA128 STMicroelectronics, STG3000X-RIVA128 Datasheet - Page 51

• Manufacturer Part Number: STG3000X-RIVA128
• Description: 128-BIT 3D MULTIMEDIA ACCELERATOR
• Manufacturer: STMicroelectronics

128-BIT 3D MULTIMEDIA ACCELERATOR
11
11.1 PALETTE-DAC
The Palette-DAC integrated into the RIVA 128
supports a traditional pixel pipeline with the follow-
ing enhancements:
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
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
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
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9
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
mode
5:6:5
0
0
1
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
1 This 32-bit repre sentation can be extended to 64-bi t and 128- bit widths by duplicating the 32-b it word in little-endian format.
DISPLAY INTERFACE
1
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
0
1
Red bypass
This 32-bit represent ation can be extended to 64-bi t and 128-bit widths by duplicating the 32-bi t word in little-endian for-
mat.
Pixel 3
Red gamma
Red bypass
Green bypass
Green gamma
Green bypass
Pixel 1
Pixel 2
Pixel formats (FBD[31:0])
Blue gamma
Blue bypass
Blue bypass
Pixel formats (FBD[31:0])
- Accepts interlaced video fields allowing a re-
- Line buffer for horizontal and vertical interpola-
- 3x2 multitap interpolating filter with image
- Color key in all color pixel modes
- High quality YUV to RGB conversion with
0
1
High quality video overlay
duction in memory buffering requirements while
incorporating temporal averaging
tion of video streams up to square pixel PAL
resolution
sharpening
chrominance control.
Red bypass
Red gamma
Red bypass
Pixel 1
Green bypass
Green gamma
Green bypass
8
Pixel 0
7
6
5
Pixel 0
4
Blue gamma
Blue bypass
Blue bypass
3
RIVA 128
2
1
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