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PDF W9971CF Data sheet ( Hoja de datos )
| Número de pieza | W9971CF | |
| Descripción | Video Graphics Controller With TV Encoder | |
| Fabricantes | Winbond Electronics | |
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W9971CF
GENERAL DESCRIPTION
Winbond s W9971CF is a highly-integrated VLSI providing high performance graphics acceleration
and TV-quality full screen motion video acceleration for IBM PCs or compatibles. The W9971CF
integrates an NTSC/PAL TV encoder with S-Video or composite video for flicker-free and glueless
TV output. An on-chip RAMDAC and a dual programmable clock synthesizer with a 170 MHz pixel
data rate are also integrated into the chip to simplify system design and reduce cost.
The W9971CF is a high-performance graphics accelerator specially designed for Microsoft
Windows, Mac OS, IBM OS/2, and DOS-based applications. In addition to 100% IBM VGA register-
level compatibility, the W9971CF 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 W9971CF s integrated video accelerator (VA) features high-quality video filtering, bilinear
interpolating scaling along both the X and Y axes, color space conversion and overlay keying. In
addition to accelerating software video playback, the W9971CF also provides an advanced
multimedia video interface for glueless interfacing to major TV decoders such as the Philips
SAA711X and the 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 W9971CF
provides high-quality video playback in 1024 × 768 256-color mode with only 1 MByte of DRAM.
The W9971CF integrates a high quality NTSC/PAL TV encoder to directly interface to TV sets. It
allows an NTSC/PAL TV to be used as the primary or secondary display for Windows-based and
video playback applications. The TV output capabilities are required for Microsoft Entertainment PC
97 designs that do not come bundled with a VGA monitor. These capabilities provide a more
realistic game, video, and multimedia experience for users who use large-screen TVs.
The flexible display memory interface design of the W9971CF allows system designers to select
various types of DRAMs, including 128K × 8, 128K × 16, 256K × 4, 256K × 8, and 256K × 16. These
DRAMs may be used in either fast page or extended data out (EDO) modes.
The W9971CF 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. VESA DDC1 and DDC2 smart monitor
control is also supported.
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W9971CF
FUNCTIONAL DESCRIPTIONS
Graphics Engine
The 64-bit graphics engine (GE) is specially designed to improve the performance of Microsoft
Windows applications and other graphical user interface software. Performance is enhanced by
accelerating GUI functions such as BitBLTs, Bresenham line draw, and short stroke vector. The GE
performs several types of BitBLTs, including HostBLT, pattern BLT, color/font expanding BLT,
transparent BLT, color expansion, and rectangle fill, with 256 ROPS on source, pattern, and
destination. The graphics engine operates at all pixel depths in enhanced modes, including 8/16/24
bit-per-pixel modes. A fully Microsoft Windows compatible 64 × 64 × 2 or 32 × 32 × 2 hardware
cursor, is used to speed up cursor performance and accelerate all graphics operations by eliminating
the CPU overhead associated with cursor manipulation.
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. 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 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. This allows a maximum enlargement of 800%. For non-integer scaling, a 10-bit DDA with
1/1024 resolution is used to interpolate pixels by averaging.
2x Scaling
Twhwe w2x.DscaatliangSlhoecaetet4dUin.tchoemRAMDAC is used to optionally scale up the overlaid data stream by a
factor of 2. This is used to scale 320 × 240 game-generated frames to full screen.
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