MX86250 Datasheet, PDF (1/25 Pages) List of Unclassifed Manufacturers – THE ADVANCED 64-BIT WINDOWS-95 AND DIRECTDRAW ACCELERATOR

INDEX
MX86250
THE ADVANCED 64-BIT WINDOWS-95
AND DIRECTDRAW ACCELERATOR
1. INTRODUCTION
The MX86250 is a new generation of fully integrated
graphics and video accelerator. On a single chip, it inte-
grates a 64-bit graphics CoProcessor, a true-color video
processor, 135 MHz RAMDAC and dual programmable
clock synthesizer. The MX86250 not only delivers extreme
high performance in conventional GUI acceleration, it also
provides very rich functionality for motion video applica-
tions. The MX86250 true color video processor allows
full screen full motion playback of AVI and MPEG video
from software based Codec's such as MPEG, Cinepak
and Indeo. For even higher quality MPEG video playback,
the MX86250 Media port supports the VMI connector link-
ing to an external MPEG-1 decoder chip. The Media port
also provides for playback and capture of live video input
from TV tuner or video camera.
One key design goal of the MX86250 is to achieve the
highest possible memory bandwidth in the display
memory subsystem using main stream and cost effec-
tive EDO DRAM chips. By applying the RISC design tech-
nique of super pipelining, the MX86250 graphics
CoProcessor can execute one bitblt operation in every
clock cycle. When running at 50 Mhz and above, using -
50 or faster EDO DRAM ( 20ns page mode cycle time),
the bandwidth can reach 400 MB/sec and above. This
extremely high bandwidth gives top-notch Windows GUI
performance and fast frame rate in motion video play-
back.
For mainstream software Codec delivered video play-
back, the MX86250 provides video acceleration by a
second generation” video processor consisting of YUV
to RGB converter, scaler, and two dimensional bilinear
filter. The scaler can zoom the video windows at arbi-
trary ratios.The bilinear filter provides both horizontal and
vertical interpolation which is absent from 1st genera-
tion video chips.
For Windows 95 Games, the MX86250 supports
DirectDraw with a rich set of features such as fast trans-
parent Blts, double buffering and page flipping so that
Windows 95 based games can achieve high speed sprite
animation.
1.1 FEATURES
High Performance 64 bit Graphics CoProcessor
• 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
• Raster Operations (ROPs) with 3 operand BitBLT ALU
• One chip 8x8x24 pattern memory achieves highest
thrughput in the most common BitBLT in Windows—
the Pattern BLT
• Deep on-chip Source and Destination FIFOs for sus
tained burst cycles in BitBLTs
• Double buffered CoProcessor registers allows concur
rent processing with CPU
• Built in Hardware cursor
Extremely high bandwidth
• Achieves single clock cycle DRAM access in
Graphics Processor, Video Processor and Display
Processor
• Provides 400 MB/sec memory bandwidth using -50
EDO DRAM chips
• Even higher performance can be achieved by using -
35 EDO DRAM for 533 MB/sec bandwidth which is
comparable to synchronous DRAM
Fully Integrated for Lower system cost
• Integrated 24 bit True Color RAMDAC supports 135
Mhz pixel rate and 256x18 look-up table with High
Color and True color bypass mode support
• Integrated dual clock synthesizers
• Glueless PCI local bus interface
• Two wire interface to EEPROM, VESA DDC inter
face or I²C channel
Flexible Display Memory configuration
• 1,2, or 4 MB display memory.
• 256K x 4, 256K x 8, and 256K x 16 dual CAS or dual
WE DRAM.
• Fast-page and Hyper-page EDO
P/N:PM0387
REV. 1.1, JUL 26, 1996
1