
O
UTREACH
PCI/PMC E
XPANSION
S
YSTEM
U
SER
’
S
M
ANUAL
C
URTISS
-W
RIGHT
C
ONTROLS
E
MBEDDED
C
OMPUTING
4-2
809524 R
EVISION
D F
EBRUARY
2009
PMC-605 T
ERMINOLOGY
The PCI local bus refers to the host SBC’s PCI local bus and is connected to the secondary
side of the 21554 PCI bridge. The PCI-P0 bus connects to the P0 backplane and to the
primary side of the 21554. As shown in Figure 4.1, Upstream refers to the direction toward
the PCI-P0 bus and Downstream refers to direction toward the local PCI bus.
F
IGURE
4.1: Primary and Secondary PCI Buses
Primary I/F
Secondary I/F
PMC-605
PCI P0 Bus
Local PCI Bus
Upstream
Downstream
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