Kontron CP6500-V, Руководство пользователя

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CP6500-V Functional Description
ID 28945, Rev. 01 © 2005 Kontron Modular Computers GmbH Page 2 - 7
P R E L I M I N A R Y
2894
5.01.UG.VC.050304/09095
2
2.2.4 Reset
The CP6500-V is automatically reset by a precision voltage monitoring circuit that detects a
drop in voltage below the acceptable operating limit of 4.85 V for the 5 V line and below 500 mV
for the 3.3 V line, or in the event of a power failure of the DC/DC converter. Other reset sources
include the watchdog timer and the push-button switch on the front panel. The CP6500-V
responds to any of these sources by initializing local peripherals.
A reset will be generated under the following conditions:
• +5 V supply falls below 4.68 V (typ.)
• +3.3 V supply falls below 3.09 V (typ.)
• Power failure of all onboard DC/DC converters
• Push-button "RESET" pressed
• Watchdog overflow
• CompactPCI backplane PRST input
2.2.5 SMBus Devices
The CP6500-V provides a System Management Bus (SMBus) for access to several system
monitoring and configuration functions. The SM Bus consists of a two-wire I²C bus interface.
The following table describes the function and address of every onboard SM Bus device.
2.2.6 Thermal Management/System Monitoring
The W83627HF can be used to monitor several critical hardware parameters of the system,
which are very important for the proper operation and stability of a high-end computer system.
The temperature sensors on the W83627HF monitor the CPU temperature and the ambient
temperature around the CPU to ensure that the system is operating at a safe temperature level.
If the temperature is too high, the sensors automatically reduce the CPU clock frequency, de-
pending on the mode chosen in the BIOS set.
Table 2-3: SM Bus Device Addresses
DEVICE SMB ADDRESS
Hardware Monitor W83627HF 0101101xb
EEPROM 24LC64 1010111xb
Clock 1101001xb
SPD 1010000xb