I-Bus 0818D, User Manual

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Chapter 6 – Platform Management Option
0818D User’s Guide 6-1
6 Platform Management Option
6.1 Overview
This chapter describes the functional and interface
specifications of the I-Bus Chassis Management Controller
(CMC). The CMC Board functions to monitor and control the
system environment of a custom cPCI enclosure. It operates
as an independent Chassis Management Controller
manageable through its RS232 port by an external device, or
as an Intelligent Platform Management device manageable
through IPMB0. It conforms to the PICMG 2.9 R1.0 System
Management Specification, supporting the following:
IPMB0 on the cPCI backplane
IPMI Command Protocol
Local I
2
C bus to connect temperature sensors and any
other remote sensing devices
The IPMB0 is driven by an I
2
C bus controller.
6.2 Description
The CMC Board is plugged into the back of an I-Bus cPCI monolithic
backplane, and mounted vertically behind the power supply
connectors.
Figure 6-1 shows the architecture of a CMC Board in conjunction
with the SBC(s) in a cPCI system.
The CMC board has four I2C ports, to support cPCI Intelligent
Platform Management Bus per PICMG 2.9. The use of these ports is
shown in Figure 6-2.
Control and communication with the CMC board is via IPMI-
command structure through the RS232 port or through IPMB0. For
example, the host controller is capable of changing and setting
limits/masks for the sensors via the IPMI command.
The CMC board is capable of replying to messages from the host
controller.