QG82945GSE S LB2R Intel, QG82945GSE S LB2R Datasheet - Page 363

• Manufacturer Part Number: QG82945GSE S LB2R
• Description: GRAPHICS AND MEM CNTRL HUB; No. of Pins: 998; Package / Case: FCBGA; Interface Type: PCI, SATA, USB
• Manufacturer: Intel

Functional Description
10.4
Figure 20.
Datasheet
Integrated Graphics Controller
The Mobile Intel 945GM/GME/GMS/GU/GSE, 943/940GML and Intel 945GT Express
Chipset internal graphics devices contain several types of components. The major
components in the IGD are the engines, planes, pipes and ports. The (G)MCH has a 3D/
2D Instruction Processing unit to control the 3D and 2D engines. The IGD’s 3D and 2D
engines are fed with data through the memory controller. The outputs of the engines
are surfaces sent to memory, which are then retrieved and processed by (G)MCH
planes.
(G)MCH Graphics Controller Block Diagram
The (G)MCH contains a variety of planes, such as display, overlay, cursor and VGA. A
plane consists of rectangular shaped image that has characteristics such as source,
size, position, method, and format. These planes get attached to source surfaces,
which are rectangular memory surfaces with a similar set of characteristics. They are
also associated with a particular destination pipe.
A pipe consists of a set of combined planes and a timing generator. The (G)MCH has
two independent display pipes, allowing for support of two independent display
streams. A port is the destination for the result of the pipe.
The entire IGD is fed with data from its memory controller. The (G)MCH’s graphics
performance is directly related to the amount of bandwidth available. If the engines are
not receiving data fast enough from the memory controller (e.g., single-channel DDR2
533), the rest of the IGD will also be affected.
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