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about 21554 bridge



Everyone:
    My project is a SMP structure, six cpu boards are connected by
CompactPCI
backplane. I know intel's 21554 can be used as PCI-to-PCI bridge. My
question
is :
    if one board is slave, 21554's primary inteface must face the
backplane, i don't
know if one board is master, which interface should face the backplane,
primary
or secondary?
thanks a lot.