STG3005A2S STMicroelectronics, STG3005A2S Datasheet - Page 42

• Manufacturer Part Number: STG3005A2S
• Description: 128-BIT 3D MULTIMEDIA ACCELERATOR
• Manufacturer: STMicroelectronics

RIVA128ZX
7
The RIVA128ZX video playback architecture is
designed to allow playback of CCIR PAL or NTSC
video formats with the highest quality while requir-
ing the smallest video surface. The implementa-
tion is optimized around the Windows 95 Direct
Video and ActiveX APIs, and supports the follow-
ing features:
Figure 43. Video scaler pipeline
42/85
Accepts interlaced video fields:
- This allows the off-screen video surface to
VIDEO PLAYBACK ARCHITECTURE
consume less memory since only one field
(half of each frame) is stored. Double buffer-
ing between fields is done in hardware with
Linestore
with graphics pixel pipeline
Video windowing, merge
Conversion to 24-bit
(Smooth/Sharpen)
Color Space
Video output
Interpolation
24-bit RGB
Interpolation
Horizontal
Vertical
Filter
RGB
YUV
128-BIT 3D MULTIMEDIA ACCELERATOR
Linestore:
- To support high quality video playback the
YUV to RGB conversion:
- YUV 4:2:2 format to 24-bit RGB true-color
- Chrominance optimization/user control
Color key video composition
‘temporal averaging’ being applied based on
intraframing.
RIVA128ZX memory controller and video
overlay engine supports horizontal and verti-
cal interpolation using a 3x2 multitap interpo-
lating filter with image sharpening.