Intel 815 manual Multi-Mode Capability Requirements

Intel® 815 Chipset: Graphics Controller PRM, Rev 1.0

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Figure 3. Conceptual Platform PCI Configuration Diagram

		Processor
AGP/		AGP Mode		GFX Mode
Secondary PCI		PCI Configuration		PCI Configuration
		Window in I/O Space	Window in I/O Space
(Bus #A -
programmable)	AGP	DRAM* Control/	Internal	DRAM* Control/
AGP	Bridge	Host Bridge	Graphics	Host Bridge
Master	Bus #0	Bus #0	Bus #0	Bus #0
	Dev #1	Dev #0	Dev #2	Dev #0
		Hub Interface		Hub Interface
			Hub Interface 0
			(Logical PCI Bus #0)
				ICH
		Hub Interface
			Hub I/F - PCI	PCI
		LPC Device		Devices
			Bridge (P2P)
		Bus #0
			PBus #0
		Dev #31
			Dev #30
		Fcn #0		Primary PCI
			Fcn #0
				(Bus #B - programmable)
		= Logical PCI Bus #0

2.3.1.Multi-Mode Capability Requirements

There are multiple Device Modes that are supported by the three PCI devices within this component:

1.AGP Mode – The AGP slot is populated with an AGP graphics card and the AGP interface device is active. The internal graphics controller is inactive.

2.GFX Mode with Local Memory – The internal graphics device is active. The AGP slot is populated with a GPA card and the AGP interface device is inactive.

3.GFX Mode with Shared Memory – The internal graphics device is active. The AGP slot is not populated with a GPA card or an AGP graphics card and the AGP interface device is inactive.

4.PCI Mode – The internal graphics controller and the AGP interface device are both inactive. The display data cycles are routed through the hub interface to the PCI display device.

2.3.1.1.Supported Single Monitor and Multi-monitor Configurations

For modern operating systems that have multiple monitor support, the primary graphics device must not be the Intel® 815 chipset internal graphics controller or an AGP graphics card. These graphics devices can serve only as secondary graphics devices in a multi-monitor configuration. It is important to understand that there is no support for simultaneous operation of the internal graphics device and an AGP graphics card.

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