Functional Description - HP Compaq dc7800 Series Technical Reference Manual

Integrated Graphics Subsystem

6.2 Functional Description

The Intel Q35 GMCH component includes an Intel Integrated Graphics Media Accelerator 3100
controller (Figure 6-1). This integrated graphics controller (IGC) operates internally of the PCIe
x16 bus and can directly drive an external, analog multi-scan monitor at resolutions up to and
including 2048 x 1536 pixels. The IGC includes a memory management feature that allocates
portions of system memory for use as the frame buffer and for storing textures and 3D effects.
The IGC provides two SDVO channels that are multiplexed through the PCIe graphics interface.
These SDVO ports may be used by an Advanced Digital Display (ADD2) card installed in the
PCI-E x16 graphics slot in driving two digital displays with a 200-megapixel clock.
Monitor [1]
PCIe x16
Graphics slot [2]
NOTE:
[1] USDT form factor only.
[2] SFF and CMT form factors only.
Figure 6-1. Q35 IGC, Block diagram
The IGC provides the following features:
■
Rapid pixel and texel rendering using four pipelines that allow 2D and 3D operations to
overlap, speeding up visual effects, reducing the amount of memory for texture storage
■
Zone rendering for optimizing 3D drawing, eliminating the need for local graphics memory
by reducing the bandwidth
■
Dynamic video memory allocation, where the amount of memory required by the application
is acquired (or released) by the controller
■
Intelligent memory management allowing tiled memory addressing, deep display buffering,
and dynamic data management
■
Provides two serial digital video out (SDVO) channels for use by an appropriate ADD2
accessory card (SFF and CMT form factors only)
■
Drives a DVI monitor directly (USDT form factor only)
6-2
Analog
RGB
Monitor
Digital
DVI-D
PCIe
& SDVO Data
Q35 GMCH
Integrated
SDRAM
GMA 3100
Controller
Controller
PCIe I/F
www.hp.com
DDR2
SDRAM
(System
Memory)
Technical Reference Guide