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Chapter 6 Graphics Subsystem
Compaq iPAQ Family of Internet Devices
First Edition - March 2000
6-2
6.2 FUNCTIONAL DESCRIPTION
The Intel 810e chipset integrates the equivalent of an Intel i740 graphics controller into the
GMCH component (Figure 6-1).
Figure 6-1.
Graphics Subsystem Block diagram
The Intel graphics controller (Figure 6-2) integrated into the GMCH component 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.
The controller uses the AGP 2X interface and supports Type 1, Type 2, and Type 3 sideband
cycles for a peak transfer rate of 533 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. Either a 32- or 64-MB block of system memory may be configured for use by the
graphics controller for graphics use. Another 512-KB block (fixed) is used for memory-mapped
control and status registers.
In Pentium III-based systems the controller also uses four megabytes of SDRAM (soldered
down) as a display cache especially suited for 3D operation. This additional display cache allows
the graphics controller to simultaneously render graphics to the Z-buffer (in the display cache)
while processing textures in a portion of system memory. The 4-MB SDRAM Display Cache is
accessed through a 32-bit 100-MHz interface.
82810e/DC-100 GMCH
Monitor
i740
Graphics
Controller
SDRAM
Controller
FSB
I/F
Hub Link
I/F
Pentium III-based system only.
4 MB SDRAM
Display Cache
RGB