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Chapter 3 Hardware Description
14 LI7WM User’s Manual
b. Dynamic Video Memory Technology
Dynamic Video Memory Technology (DVMT) enables breakthrough
graphics and memory performance for all PC segments through Direct
AGP and highly efficient memory use. DVMT ensures the most
efficient use of all available memory – regardless of whether a frame
buffer is present or the size of the main memory– for maximum 3D
graphics performance. DVMT also responds to application
requirements by automatically allocating the proper amount of display
and texturing memory. For example, a 3D application might require
more texture memory to enhance the richness of 3D objects. The
operating system (OS) views the Intel 810 and 810E chipset driver as
an application which uses Direct AGP to request re -allocation of
additional memory for 3D applications and returns memory when not
required. DVMT is highly scalable — as additional memory is added to
the system, more memory will be available to enhance 3D applications.
DVMT works dynamically and modulates the bandwidth available to
the CPU, graphics and I/O interface, through the intelligent arbitration
built into the Intel 82810E. This hard-coded logic evaluates the
operating environment and prioritizes traffic to maximize bandwidth
for memory intense multimedia applications.
c. Memory Usage with DVMT
The operating system requires allocation of up to 1Mbyte of system
memory to support legacy VGA. System properties will display up to
1Mbyte less than physical system memory available to the operating
system. The graphics driver for the Intel 810E/810 chipsets
configurations will request up to 4Mbyte of memory from the OS to
implement a maximum 1024 x768 screen resolution, 2Mbyte for a
command buffer and 4Mbyte used for z-buffering. For high-end 3D
applications, the drivers request allocation of system memory from the
OS for graphics textures. When the 3D application is closed, the O/S
will re-allocate system memory back for generic use.
3.11 TV-Out
Chrontel’s CH7007 digital PC to TV encoder is a stand-alone
integrated circuit which provides a PC 99 compliant solution for TV
output. Suggested application use with the Intel 810 chipset and Intel
810E chipset. It provides a universal digital input port to accept a pixel
data stream from a compatible VGA controller (or equivalent) and
converts this directly into NTSC or PAL TV format.