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8-2 AlphaServer GS80/160/320 User’s Guide
8.1 Console Serial Bus Subsystem
The console serial bus (CSB) links microprocessors throughout the
system, forming a monitoring and control subsystem managed by the
system control manager (SCM). The SCM microprocessor is located on
the standard I/O module in the master PCI box. Figure 8–1 shows a
block diagram of the CSB, the microprocessors (or “managers”), and
theSCM. AlsoshownisaredundantSCMavailableasastandby
console.
Figure 8–1 CSB Block Diagram
SIO SIO
SCM SCM
HPM
PBM
Key:
SCM -System Control Manager
SIO - Standard I/O Module
QBB - Quad Building Block
PSM - Power System Manager
GP - Global Port
PBM - PCI Backplane Manager
HPM - Hierarchical Switch Power
Manager
QBB1
QBB2
QBB3
Console
QBB4
QBB5
QBB6
QBB7
QBB0
GP
PSM
PSM
PSM
PSM
PSM
PSM
PSM
GP
GPPSM
Hierarchical
Switch
Standby
Console
OCP
GP
GP GP
GP
GP
PCI0
PBM
PBM
PBM
PCI1
PCI2
PCI3
PK-0613-98