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3-18 AlphaServer GS80/160/320 User's Guide
3.8 PCI Boxes
A QBB supports up to two PCI boxes. A cable connects the QBB “local”
I/O riser to the “remote” I/O riser in the PCI box. There are two I/O
ports on a local I/O riser. Each I/O port is used to connect to one
remote I/O riser. Figure 3–10 shows QBB0 connected to PCI box 0 and
PCI box 1.
Figure 3–10 Sample I/O Subsystem
PK-0652-99
PCI Box 0 PCI Box 1
PCI Bus
PCI Bus
PCI Bus PCI Bus
PCI Bus
PCI Bus
PCI Bus PCI Bus
PCA
Chip
PCA
Chip
PCA
Chip
PCA
Chip
Remote I/O
Riser 1
Remote I/O
Riser 1
Remote I/O
Riser 0
Remote I/O
Riser 0
10 32
Local I/O Riser Local I/O Riser
QBB0