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W9970CF

Video Graphics Controller

Winbond 

W9970CF

Video Graphics Controller

FEATURES

u 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

u 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

ú HostBLT

ú Pattern BLT

ú Color/font expanding BLT

ú Transparent BLT

ú Color/font expansion

ú Rectangle fill

ú 256 three-operand (source, pattern and

destination) ROPs

• Bresenham line drawing

• Short stroke vector drawing

• Rectangle and line clipping

• 64 × 64 × 2 or 32 × 32 × 2 hardware cursor

u Video Acceleration

• Video (YUV) and graphics (RGB) shared frame

buffer architecture

• Two-dimensional bilinear interpolation scaling with

1-pixel resolution from 1× to 8×

• On-chip standard CCIR 601 YUV to RGB color space

conversion

• Cropping window and filtering supports

• Hardware support for Microsoft DirectDraw feature

set

ú Double buffering and page flipping to prevent from

tearing in image

ú Transparent BitBLTs of sprites for game

acceleration

ú Color keying, chroma keying and window keying

to overlay video and graphics streams

ú On-the-fly blending of video and graphics streams

• Supports 2× scaling to allow 320×200 game image to

be displayed at 640 × 480 full-screen resolution

• High-quality video playback requiring only 1 MByte

DRAM in 1024 × 768 256-color mode

• Dual hardware-accelerated video windows for video

conference applications

u 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

u 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

u System Bus Interface

• Glueless support for 32-bit PCI Local Bus Revision

2.1 specification

• Zero-wait-state PCI burst mode support

• Linear addressing

• Memory-mapped I/O

u Display Memory Interface

• 64 or 32-bit DRAM interface in a 1, 2, or 4 MByte

configuration

• Flexible interface support for 128K × 8, 128K × 16,

256K × 4, 256K × 8, or 256K × 16 DRAMs

Preliminary

-1-

March 1996

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