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Intel MultiProcessor Specification page 47

Intel multiprocessor specification
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Table 4-8. Bus Type String Values
Bus Type String
CBUS
CBUSII
EISA
FUTURE
INTERN
ISA
MBI
MBII
MCA
MPI
MPSA
NUBUS
PCI
PCMCIA
TC
VL
VME
XPRESS
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.
Version 1.4
Description
Corollary CBus
Corollary CBUS II
Extended ISA
IEEE FutureBus
Internal bus
Industry Standard Architecture
Multibus I
Multibus II
Micro Channel Architecture
MPI
MPSA
Apple Macintosh NuBus
Peripheral Component Interconnect
PC Memory Card International Assoc.
DEC TurboChannel
VESA Local Bus
VMEbus
Express System Bus
MP Configuration Table
4-11

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