95
Device Address Definition
C
PCI Devices
PCI devices are fully configured under I/O and/or Memory address space. Table C-2
describes the PCI bus devices that are on-board the VMICPCI-7611 along with each
device’s configuration spectrum.
The PCI bus includes three physical address spaces. As with ISA bus, PCI bus
supports Memory and I/O address space, but PCI bus includes an additional
Configuration address space. This address space is defined to support PCI bus
hardware configuration (refer to the PCI bus Specification for complete details on the
configuration address space). PCI bus targets are required to implement Base Address
registers in configuration address space to access internal registers or functions. The
BIOS uses the Base Address register to determine how much space a device requires
in a given address space and then assigns where in that space the device will reside.
This functionality enables PCI devices to be located in either Memory or I/O address
space.
Table C-2 PCI Device Mapping Configuration
Device
Memory
Space
I/O Address
Space
PIC Interrupt
Options
Ethernet
Anywhere
Anywhere
PCI Defined
PMC Site
Anywhere
Anywhere
PCI Defined
**
Refer to the VMICPCI-7611-001 User’s Manual.
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