W9970CF Datasheet, PDF (3/6 Pages) Winbond – VIDEO GRAPHICS CONTROLLER

W9970CF
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.
32
System
Bus
Interface
32
32
PCI Bus
8
32
BIOS ROM
Graphics Engine
Clock
Synthesizers
MCLK
VCLK
SVGA
64
DRAM
Controller
64
32/64 DRAM
24
Video Accelerator
RAMDAC
24
Monitor
8/16
Multimedia Video Interface
Preliminary
Figure 2. W9970CF Block Diagram
-3-
March 1996