Introduction
ROBO-603 User’s Manual
1-10
1.4.8
SMI Lynx3DM SM721 VGA Controller
The Lynx3DM consists of a logic block, which interfaces to a 4MB or 8MB block of integrated
memory. The integrated memory supports single clock cycle transfers up to 100MHz. Peak memory
bandwidth for the integrated 128-bit memory bus is over 1.6GB/s.
The logic within the Lynx3DM consists of 11 functional blocks: PCI Interface, Host Interface (HIF),
Memory Controller, Drawing Engine, Power Down Control Unit, Video Processor, Video Capture
Module, LCD Backend Controller, VGA Core, PLL Module, and RAMDAC. A summary of each
of the functional blocks, along with important features follows:
AGP 2X sideband support
PCI 2.1 compliant
33 MHz PCI Master/Slave interface
Dual aperture feature for concurrent VGA and video/drawing engine access
Independent memory interface control
Up to 128-bit memory interface
Over 1.6GB/s memory bandwidth
100MHz single clock/cycle engine
Designed to accelerate DirectDraw and Direct3D
IEEE Floating Point Setup Engine
Complete 3D Rendering Engine set:
- Bi-linear and tri-linear filtering
- Mip Mapping
- Vertex and global fog
- Source and destination alpha blend
- Specular highlights
- Edge anti-aliasing
- Z-buffering
- Gouraud shading
- Mirrored textures
-Texture decompression
Offloads motion compensation portion of MPEG-2 decode process from CPU
