GMCH Register Description
Figure 4-3. GMCH Configuration Cycle Flow Chart
4.4.1
Internal Device Configuration Accesses
The GMCH decodes the Bus Number (bits 23:16) and the Device Number fields of the
CONFIG_ADDRESS register. If the Bus Number field of CONFIG_ADDRESS is 0, the
configuration cycle is targeting a PCI Bus 0 device.
If the targeted PCI Bus #0 device exists in the GMCH and is not disabled, the
configuration cycle is claimed by the appropriate device.
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Datasheet