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W9970CF

Datasheet W9970CF Datasheet (Winbond Electronics)

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Page 1
W9970CF
Video Graphics Controller
FEATURES
❑
Integrated Video Graphics Controller
• 64-bit graphics engine
• Integrated video accelerator
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
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
❑
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
❑
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
❑
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
❑
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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W9970CF
• EDO DRAM support, dual-CAS# and dual-WE# ×16
DRAMs support
• Auto memory size detection and auto bank switching
• Supports UMA (Unified Memory Architecture) to
share frame buffer with system memory
❑
Green PC support
• VESA DPMS
VAFC/Feature Connector
(optional)
Live-Video
TV Decoder
(optional)
MPEG-1 Decoder
(optional)
• RAMDAC/clock synthesizers power management
❑
Smart monitor control
• VESA-compatible DDC1 and DDC2
❑
Packaging
• 208-pin PQFP package
DRAM
Display Memory
64
W9970CF
RGB
BIOS
32
PCI Bus
Figure 1. W9970CF System Application Diagram
Preliminary -2- March 1996
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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 register­level compatibility, the W9970CF incorporates a 64­bit 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 high­quality 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
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
PCI Bus
8
BIOS ROM
System Bus Interface
32
Graphics Engine
Clock Synthesizers
32
SVGA
32
Video Accelerator
Multimedia Video Interface
24
8/16
MCLK
VCLK
64
DRAM
DRAM Controller
64
RAMDAC
24
32/64
Monitor
Figure 2. W9970CF Block Diagram
Preliminary -3- March 1996
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GRAPHICS ENGINE
VIDEO ACCELERATOR
The Video Accelerator is a high-quality video processor for enhancing and displaying video images. It not only accelerates software video playback but also facilitates the interface to MPEG-1 video decoders and TV decoders.
The video accelerator employs back-end color space conversion and a scaling mechanism (see Figure 3). Video and game-generated graphics frames are read from an off-screen buffer and sent to the overlay and blending control block as the secondary stream. Color space conversion and scaling are performed along the way. This on-the-fly video acceleration and overlaying ensure game and video playback at full speed.
Color Space Conversion
The built-in color space converter converts YUV format to 24-bit RGB format according to the CCIR 601-2 Recommendation.
Down Scaling
The down-scaling function is performed by dropping
W9970CF
pixels or lines. To support arbitrary scaling factors, the video accelerator uses a digital differential accumulator (DDA) to drop pixels or lines smoothly. The scaling factor may range from 1/64 to 63/64.
Scaling up by 2D Interpolation
Rather than duplicating pixels or lines for enlargement, the video accelerator uses a 2-D bilinear interpolation algorithm to enhance the output for high-quality video display.
The interpolation algorithm creates seven weighted, intermediate values between two original pixels or lines, which allows a maximum of 800% enlargement. For non-integer scaling, a 10-bit DDA with 1/1024 resolution is used to interpolate pixels by averaging.
2x Scaling
The 2x scaling located in the RAMDAC is used to optionally scale up, both horizontally and vertically, by a factor of 2 for the overlaid data stream. This is used to scale 320 × 240 game-generated frames to full screen.
Filtering
The video accelerator provides horizontal RGB or YUV filtering to reduce noise and aliasing artifacts in the video data stream
Cropping
A rectangular cropping window is supported in the video accelerator for subsampling the incoming video data stream. Only video located in the cropping window can be stored into the off-screen buffer.
Alpha Blending
Alpha blending is supported for overlaying the primary stream and secondary stream. The alpha value can be 1 bit or 3 bits. The 1-bit alpha depth overlaying (also known as software key) is supported only for the pixel format of RGB 1:5:5:5, where the alpha bit value of 0 is transparent and value of 1 is opaque.
An overlay control register specifies the 3-bit alpha value for the primary stream (Kp) and secondary stream (Ks). Note that Kp + Ks must be ≤ 8. The blending equation is [Pp × Kp + Ps × Ks]/8, where Pp
Preliminary -4- March 1996
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W9970CF
is the primary stream pixel data and Ps is the secondary stream pixel data.
Overlay Control
The overlay controller provides control for overlaying of four input sources: the primary stream (normally the graphics data), secondary stream, blending stream, and FC/VAFC pass-through data stream. When the hardware cursor is active, it is overlaid on top of all stream images. The W9970CF supports a range of advanced forms of keying including window key, color
Host Data
Multimedia Video Interface
Primary Stream
H/W Cursor
32
8/16
FC/VAFC
8/16
24
8
CODEC
FIFO
HD Bus
YUV Bus
CSC
Overlay
1
16
8
24
Cropping
&
Filtering
2-D Bilinear
Interpolation
RGB 8.8.8
256X18
LUT
key, chroma key, software key (1-bit alpha overlaying in RGB 1:5:5:5 format), external key (FC/VAFC only), and a logic combination of these keys.
Dual Video Windows
Two video windows may be displayed on the monitor simultaneously. This makes W9970CF highly suitable for video conferencing applications. If the two video windows are placed at different scan lines, they can be scaled separately with different factors.
Capture
FIFO
SS
FIFO
Blending
&
Overlay 2
32/64
32/64
24
DRAM Controller
Secondary Stream
DAC
Line Buffer
MSW
MUX
Down-
Scaling
24
2X
Figure 3. Video Accelerator Block Diagram
Preliminary -5- March 1996
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W9970CF
Headquarters:
Winbond Electronics Corp. No.4, Creation Rd. III Science Park, Hsinchu Taiwan, ROC T: 886 35 770066 F: 886 35 792647
USA:
Winbond Electronics North America Corp. 2730 Orchard Parkway San Jose, CA95134 T: 1 408 9436666 F: 1 408 9436668
Taipei:
115/11F Ming Sheng E. Rd. Taipei, Taiwan ROC T: 886 2 7190505 F: 886 2 7197502
Hong Kong:
Winbond Electronics [H.K.] Ltd. Rm 803, World Trade Square, Tower II Kowloon, Hong Kong T: 852 27516023 F: 852 27552064
WWW: www.winbond.com.tw
Preliminary -6- March 1996
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