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MP Configuration Table
Version 1.4 4-11
Table 4-8. Bus Type String Values
Bus Type String Description
CBUS Corollary CBus
CBUSII Corollary CBUS II
EISA Extended ISA
FUTURE IEEE FutureBus
INTERN Internal bus
ISA Industry Standard Architecture
MBI Multibus I
MBII Multibus II
MCA Micro Channel Architecture
MPI MPI
MPSA MPSA
NUBUS Apple Macintosh NuBus
PCI Peripheral Component Interconnect
PCMCIA PC Memory Card International Assoc.
TC DEC TurboChannel
VL VESA Local Bus
VME VMEbus
XPRESS Express System Bus
Each bus in a system must have a unique BUS ID if any one of the following criteria are true:
1. The bus does not share its memory address space with another bus.
2. The bus does not share its I/O address space with another bus.
3. The bus does not share interrupt lines with another bus.
4. Any aspect of the bus as an independent entity is software visible (such as PCI configuration
space).
Special consideration must be given when assigning a BUS ID for local buses such as VL, which
are designed to work in conjunction with another bus. If the bus looks like a part of another bus
because it uses a subset of that bus's interrupts and address space, rendering it totally invisible to
software, it does not need its own bus entry in the table. The two buses are then considered a single
logical bus.