815-Based Graphics Functional Description; Figure 6-1. 815E-Based Graphics - HP Deskpro EX Technical Reference Manual

Chapter 6 Embedded Graphics Subsystems
6.2

815-BASED GRAPHICS FUNCTIONAL DESCRIPTION

The Intel 815E chipset integrates the equivalent of an Intel i740 graphics controller into its 82815
GMCH component (Figure 6-1). The i740 graphics controller includes 2D and 3D accelerator
engines working with a deeply-pipelined pre-processor. The controller supports perspective-
correct texture mapping, bilinear and anisotropic Mip-mapping, Alpha blending, Gouraud shading,
and fogging.
Optional
4 MB
GPA Card
(in AGP slot)
Described in Chapter 3
Described in Chapter 4
Figure 6-1. 815E-Based Graphics, Block diagram
The controller uses the AGP 4X interface and supports Type 1, Type 2, and Type 3 sideband
cycles for a peak transfer rate of 1 MB/s. The AGP interface also allows the Intel graphics
controller to use a portion of system memory for instructions, textures, and frame (display)
buffering. Using a process called Dynamic Video Memory Technology (DVMT), the controller
dynamically allocates display and texture memory amounts according to the needs of the
application.
6-2 Compaq Deskpro EX Series of Personal Computers
AGP Bus
i740
Graphics
RGB
Controller
Monitor
First Edition - August 2000
82815 GMCH
FSB
I/F
SDRAM
Controller
Hub
Link