OCPRF100 MP Server System Technical Product Specification
Revision 1.0
8.2.7.3Fault LEDs
The
During initialization, the microcontroller flashes the LEDs for 2 seconds to signal POST completion successfully.
8.2.8IPMB (I2C bus)
The Intelligent Platform Management Bus(IPMB) is a
tem interfaces (e.g., the PCI bus or the processor/memory bus). The I2C bus controller is integrated into the microcontroller.
8.2.9Temperature Sensor
A Dallas* DS1621 temperature sensor device is connected to each microcontroller on a “private”
I2C bus. This device is used to monitor the drive bay temperature. The temperature may be read via
Microcontroller programming implements the private I2C connection by explicitly setting and clearing appropriate clock and data signals, to emulate an
8.2.10Serial EEPROM
The AT24C02N* provides 256 bytes of nonvolatile storage. This is used to hold the serial num- ber, part number, and other field replaceable unit (FRU) inventory information and miscellaneous application code used by firmware about the backplane.
8.3Board Functions
This section describes functioning parts as required by the SCSI Accessed
8.3.1Reset
8.3.1.1Cold Reset
At power up, all logic on the backplane is held in reset until the power supplies are stable. Two sources of
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