D865GSA Datasheet, PDF (29/94 Pages) Intel Corporation – Technical Product Specification

Product Description
1.5.1.10 AGP Digital Display (ADD) Card Support
The GMCH routes two 12-bit multiplexed DVO ports that are each capable of driving a
165 MHz pixel clock to the AGP connector. The DVO ports can be paired for dual
channel mode. In dual channel mode, the GMCH is capable of driving a 24-bit 330 MHz
pixel clock. When an AGP add-in card is used, the Intel Extreme Graphics 2 controller
is disabled and the AGP connector operates in AGP mode. When an ADD card is
detected, the Intel Extreme Graphics 2 controller is enabled and the AGP connector is
configured for DVO mode. DVO mode enables the DVO ports to be accessed by an
ADD card. ADD cards can support up to two display devices with the following
configurations:
• TV-Out
• Transition Minimized Differential Signaling (TMDS)
• Low Voltage Differential Signaling (LVDS)
• Single device operating in dual channel mode
# ^{INTEGRATOR’S NOTES}
• Synchronous display is not supported when one of the display devices is a TV.
• Synchronous display with two digital displays is not supported.
• Digital Visual Interface (DVI) support is present only when an ADD card is installed.
1.5.2 Universal 0.8 V / 1.5 V AGP 3.0 Connector
The AGP connector supports the following:
• 4x, 8x AGP 3.0 add-in cards with 0.8 V I/O
• 1x, 4x AGP 2.0 add-in cards with 1.5 V I/O
• AGP Digital Display (ADD) cards
AGP is a high-performance interface for graphics-intensive applications, such as 3D
applications. While based on the PCI Local Bus Specification, Rev. 2.2, AGP is
independent of the PCI bus and is intended for exclusive use with graphical display
devices. AGP overcomes certain limitations of the PCI bus related to handling large
amounts of graphics data with the following features:
• Pipelined memory read and write operations that hide memory access latency
• Demultiplexing of address and data on the bus for nearly 100 percent efficiency
# ^{INTEGRATOR’S NOTES}
• AGP 2x operation is not supported.
• Install memory in the DIMM sockets prior to installing the AGP video card to avoid
interference with the memory retention mechanism.
• The AGP connector is keyed for Universal 0.8 V AGP 3.0 cards or 1.5 V AGP 2.0
cards only. Do not attempt to install a legacy 3.3 V AGP card. The AGP connector
is not mechanically compatible with legacy 3.3 V AGP cards.
For information about
The location of the AGP connector on the D865GSA board
Refer to
Figure 11, page 54
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