Service manual

1-82 AlphaServer GS80/160/320 Service Manual
1.21.2 PCI Backplane
The PCI backplane contains the connectors for the remote I/O risers,
PCI devices, and the standard I/O module. Much of the logic on the PCI
backplane is dedicated to communicating with devices on the PCI
buses and controlling the interface with the PCA ASICs on the remote
I/O risers. The PCI backplane also contains the PBM microprocessor
connected to the CSB.
Figure 1– 37 PCI Backplane Layout