OVERVIEW
The W9970CF Integrated Video Graphics Accelerator is a highly integrated product offered by Winbond to provide high-performance graphical user interface (GUI) acceleration and TV-quality full-screen motion video acceleration for PCI Bus-based IBM PCs or their compatibles. An on-chip RAMDAC and dual programmable clock synthesizers with up to 135 MHz pixel data rate are also integrated to simplify system design and reduce cost.

FEATURES
❑ Integrated Video Graphics Controller
• 64-bit graphics engine
• Integrated video accelerator
• On-chip 24-bit true color RAMDAC with up to 135 MHz pixel clock rate
• On-chip clock synthesizers generating up to 135 MHz VCLK and 80 MHz MCLK

❑ Graphics Engine
• 64-bit graphics acceleration
• 8/16/24 bit-per-pixel true color acceleration
• Deep command queue to improve GE performance
• Bit block transfer between system memory and display memory
   □  HostBLT
   □  Pattern BLT
   □  Color/font expanding BLT
   □  Transparent BLT
   □  Color/font expansion
   □  Rectangle fill
   □  256 three-operand (source, pattern and destination) ROPs
• Bresenham line drawing
• Short stroke vector drawing
• Rectangle and line clipping
• 64 x 64 x 2 or 32 ´ 32 x 2 hardware cursor

❑ Video Acceleration
• Video (YUV) and graphics (RGB) shared frame buffer architecture
• Two-dimensional bilinear interpolation scaling with 1-pixel resolution from 1x to 8x
• On-chip standard CCIR 601 YUV to RGB color space conversion
• Cropping window and filtering supports
• Hardware support for Microsoft DirectDraw feature set
   □  Double buffering and page flipping to prevent from tearing in image
   □  Transparent BitBLTs of sprites for game acceleration
   □  Color keying, chroma keying and window keying to overlay video and graphics streams
   □  On-the-fly blending of video and graphics streams
• Supports 2x scaling to allow 320´200 game image to be displayed at 640 x 480 full-screen resolution
• High-quality video playback requiring only 1 MByte DRAM in 1024 x 768 256-color mode
• Dual hardware-accelerated video windows for video conference applications

❑ Multimedia Video Interface
• Glueless MPEG-1 video decoder (W9920DF) support for YUV 4:2:2 video input
• Glueless TV decoder support for YUV 4:2:2, NTSC or PAL live-video input
• Support for RGB 5:5:5, 5:6:5 or YUV 4:2:2 software CODEC video input
• Glueless support for 16-bit baseline VESA Advanced Feature Connector (VAFC)
• Glueless support for 8-bit bidirectional pass-through VGA feature connector

❑ Compatibility
• 100% hardware compatible with IBM VGA standard
• VESA BIOS extension support and VESA monitor timing compliant
• Driver support for all major operating systems, such as Windows 3.1, Windows 95, Windows NT, and OS/2 Warp 3.0
(Continue ...)