Console Serial Bus Subsystem; Csb Block Diagram - Compaq AlphaServer GS80 User Manual

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
the SCM. Also shown is a redundant SCM available as a standby
console.
Figure 8–1 CSB Block Diagram
QBB0
GP
PSM
QBB1
GP
PSM
QBB2
GP
PSM
QBB3
PSM GP
PCI1
PCI0
PBM
SIO
SCM
Console
8-2 AlphaServer GS80/160/320 User's Guide
QBB4
Hierarchical
GP
Switch PSM
QBB5
GP
PSM
QBB6
GP
PSM
QBB7
GP
PSM
HPM
PCI2
PBM
PBM
OCP
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
PCI3
PBM
SIO
SCM
Standby
Console
PK-0613-98