Advantech AIMB-540 User Manual

Contents

Advantech AIMB-540 User Manual Manual pdf 85 page image

77 Chapter 55.5.7 VGA SetupIntroductionAs quoted from “Intel ® 845GV chipset Graphics Chipset Controller Hub(GMCH) Rev. 1.0 May 2002.The Intel ® 845GV Graphics Memory Controller Hub (the 845GVGMCH) is Intel’s first memory controller hub with integrated graphicsfor the Intel Pentium ® 4 processor. The 845GV GMCH, with its newarchitecture graphics engine, delivers not only high 2D/3D graphics per-formance, but also provides efficient, high bandwidth communicationchannels connecting the processor, the memory, the I/O subsystem, andother components together to deliver a stable mainstream desktop plat-form solution. The features include:• Built-in 2D/3D VGA controller.• Use Intel® Extreme Graphics Architecture• Integrated 350MHz RAMDAC that can directly drive a progressivescan analog monitor up to a resolution of 2048 x 536 at 60 MHz• Up to 1600 x 1200 x 32 resolution at 85 Hz refresh.• H/W motion compensation assistance for s/w MPEG 2 decoding.• Software DVD at 30 fps Full Screen.Dynamic Video Memory TechnologyThe following is quoted from “Intel ® 845GV Chipset Dynamic VideoMemory Technology” Rev. 1.2 June 2002 Dynamic Video Memory Tech-nology (DVMT) is an enhancement of theUMA concept, wherein the optimum amount of memory is allocated forbalanced graphics and system performance, through Direct AGP knownas Non-Local Video Memory (NLVM), and a highly efficient memoryutilization scheme. DVMT ensures the most efficient use of availablememory regardless of frame buffer or main memory sizing Q for maxi-mum 2D/3D Graphics performance. DVMT dynamically responds to sys-tem requirements, and applications demands, by allocating the properamount of display, texturing and buffer memory after the operating sys-tem has booted. For example, a 3D application when launched mayrequire more vertex buffer memory to enhance the complexity of objects,or more texture memory to enhance the richness of the 3D environment.The operating system views the integrated graphics driver as an applica-tion, which uses Direct AGP to request allocation of additional memory