CP308 Functional Description
ID 1027-4487, Rev. 3.0 Page 2 - 27
P R E L I M I N A R Y
2.4 System Management Controller
A dedicated System Management Controller (SMC) on the CP308 manages system relevant
tasks and supports SMC commands and sensors.
The SMC can measure onboard voltages and temperature values, and control and supervise
fans and other CompactPCI cards in a system. The control and supervision of CompactPCI
cards is performed via the I²C bus (IPMB) on the CompactPCI connector J1.
The SMC communicates with the processor via the Keyboard Controller Style (KCS) interface,
which is at the I/O location 0xCA2 and 0xCA3.
To read status information (e.g. POST code) and configure some CPLD registers, the SMC can
directly communicate with the onboard CPLD chip via an I²C interface.
2.4.1 Sensors Implemented on the CP308
The CP308 implements several sensors such as sensors for temperature, voltage, power sup-
ply, fan, etc.
Table 2-20: Processor and Chipset Sensors and Signals
FUNCTION DESCRIPTION
PLT reset Status of the platform reset signal
Board reset Reset the host processor
S3 sleep state Status of chipset sleep state
Power button Set chipset power button signal
uEFI BIOS Flash select uEFI BIOS fail-over control
Table 2-21: CPCI-Specific Sensors
FUNCTION DESCRIPTION
CPCI GA[4:0] CPCI Geographic address
CPCI SYSEN# CPCI System slot indication
CPCI DEG# CPCI power derate status
CPCI FAL# CPCI power fail status
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