Introduction
A graphics subsystem using the MX86251 and 3Dfx Interactive Voodoo RushTM combines industry leading 3D performance with the proven performance and compatibility of an industry standard 2D Windows accelerator. This union creates an extremely cost effective and uncompromising multimedia solution. The MX86251 provides a PCI system interface and high performance VGA, 2D, and Video features in a low cost 2D chip while the Voodoo RushTM delivers 3D graphics processing power. The MX86251 connects to Voodoo RushTM through the high performance 64-bit VR interface.

Features
Interface to 3Dfx VOODOO RUSHTM 3D graphic chipset
• Provide industry leading price / performance in 2D and Video
• Enable the add-in of advanced 3Dfx Interactive Voodoo RushTM 3D texture mapping and pixel rendering engines
• 4MB frame buffer enables higher resolution 3D graphics
• Double, Triple and Quad buffer swap
• Optimized LFB PCI write cycles with packing FIFO for most efficient usage of frame buffer bandwidth

Very high bandwidth, up to 600 MB/sec
• Achieves single clock cycle EDO DRAM access in Graphics Co-processor, Video Processor and Display Processor
• Delivers 600 MB/sec bandwidth with -35 EDO DRAM running at 75 MHz
• Provides 400 MB/sec memory bandwidth using lower cost -50 EDO DRAM chips

High Performance 64-bit Graphics Co-processor
• High performance graphics engine with 64 bit wide data path and memory data bus
• Uniformly accelerated graphics operations in all pixel formats: 256 color, High color and True color
• Optimized graphics engine for BitBLTs, rectangle fill, pattern fill, line draw, color expansion, text transfer, and clipping
• Advanced 3 operand BitBLT ALU executes all 256 Raster Operations (ROPs)
• On chip 8x8x32 pattern memory achieves highest throughput in the most common BitBLT in Windows -- the Pattern BLT
• Deep on-chip Source and Destination FIFOs for sustained burst cycles in BitBLTs
• Double buffered Co-processor registers allow concurrent processing with CPU
• Built in hardware cursor
• Arbitrary X-Stride for efficient offscreen memory allocation

Motion Video Codec Acceleration
• Contrast brightness adjustment
• YUV/YCrCb conversion of industry standard YUV 4.2.2 formats
• Video window zoom in both X and Y direction with arbitrary ratio
• Interpolation with Bi-linear filters in both Horizontal and Vertical dimensions
• Color Key supports video overlay
• Video window is double buffered
• Video is always played in True Color
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