Advantech AIMB-540, Руководство пользователя

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77 Chapter 5
5.5.7 VGA Setup
Introduction
As quoted from “Intel
®
845GV chipset Graphics Chipset Controller Hub
(GMCH) Rev. 1.0 May 2002.
The Intel
®
845GV Graphics Memory Controller Hub (the 845GV
GMCH) is Intel’s first memory controller hub with integrated graphics
for the Intel Pentium
®
4 processor. The 845GV GMCH, with its new
architecture graphics engine, delivers not only high 2D/3D graphics per-
formance, but also provides efficient, high bandwidth communication
channels connecting the processor, the memory, the I/O subsystem, and
other 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 progressive
scan 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 Technology
The following is quoted from “Intel
®
845GV Chipset Dynamic Video
Memory Technology” Rev. 1.2 June 2002 Dynamic Video Memory Tech-
nology (DVMT) is an enhancement of the
UMA concept, wherein the optimum amount of memory is allocated for
balanced graphics and system performance, through Direct AGP known
as Non-Local Video Memory (NLVM), and a highly efficient memory
utilization scheme. DVMT ensures the most efficient use of available
memory 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 proper
amount of display, texturing and buffer memory after the operating sys-
tem has booted. For example, a 3D application when launched may
require 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