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 registerlevel 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 capab
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