W9970CF

TheW9970CF Integrated Video Graphics Accelerator is a highly integrated product offered byWinbond to provide high-performance graphical user interface (GUI) acceleration and TV-quality full-screen motion video acceleration for PCI Bus-based IBMPCs 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 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 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 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.