W9970CF

Preliminary

-

3-

March 1996

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.

The W9970CF is a high-performance graphics

accelerator specially designed for the Microsoft

Windows family, IBM OS/2, and DOS-based

applications. Besides the 100% IBM VGA register-

level compatibility, the W9970CF incorporates a 64-

bit graphics engine (GE) to accelerate drawing

functions such as bit block transfer (BitBLT), line

drawing, clipping, and hardware cursor manipulation.

The integrated video accelerator (VA) features high-

quality video filtering, bilinear interpolation scaling

along both the X and Y axes, color space conversion

and overlay keying. In addition to accelerating

software video playback, the W9970CF also provides

an advanced multimedia video interface for glueless

interfacing to the Winbond W9920DF MPEG-1 video

decoder and TV decoders such as the Philips

SAA7110 and Brooktree Bt815A/7A/9A. The 16-bit

baseline VESA Advanced Feature Connector (VAFC)

and the 8-bit bidirectional IBM Feature Connector are

also supported for legacy video applications. By

performing scaling and color space conversion on the

fly, the W9970CF provides high-quality video

playback in 1024

× 768 256-color mode with only 1

MBytes of DRAM.

The integration of a GE, a VA, RAMDAC and dual

clock synthesizers in one chip provides an all-in-one

controller for graphics and video display subsystem.

The flexible display memory interface design of the

W9970CF allows system designers to select various

types of DRAMs, including 128K

× 8, 128K × 16,

256K

× 4, 256K × 8, and 256K × 16 in either fast page

or extended data out (EDO) modes.

The W9970CF supports a glueless interface with the

32-bit PCI Local Bus. Green PC power management is

supported via VESA Display Power Management

Signaling (DPMS) and power-down of the on-chip

RAMDAC and clock synthesizers. The VESA DDC1

and DDC2 smart monitor control is also supported.

System

Bus

Interface

Graphics Engine

SVGA

Video Accelerator

RAMDAC

DRAM

Controller

Clock

Synthesizers

PCI Bus

Multimedia Video Interface

DRAM

Monitor

32/64

8/16

32

BIOS ROM

8

32

32

24

64

24

64

MCLK

VCLK

32

Figure 2. W9970CF Block Diagram