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SCSI Backplane Board Intel® Server Platform SR6850HW4 TPS
Revision 1.0
Intel order number D23151-001
76
7.2.4 Server Management Interface
The SCSI Backplane Board supports the following server management features:
Local I2C Interface
- Field Replaceable Unit (FRU)
- Temperature sensor
- Microcontroller interface (Hot Swap Controller)
System I2C Interface
- Micro-controller IPMB interface
- I
2
C/SM Bus (for fan monitoring)
7.2.4.1 Local I
2
C Bus
The Bus A local I
2
C bus connects the DS75 (or equivalent) thermal sensor and Atmel*
AT24C02N (or equivalent) serial EEPROM (with FRU data) to the microcontroller. This thermal
sensor is used by the BMC for the ambient temperature of the system.
7.2.4.2 Isolated Global I
2
C Bus (IPMB)
The global I
2
C bus connects the controllers to the system. The global I
2
C bus is isolated from
the system until the system PWRGRD reaches the SCSI Backplane Board.
7.2.4.3 I
2
C I/O Bus
The I
2
C I/O bus connects the Server Board Set SE8500HW4 Mainboard microcontroller to the
Server Platform SR6850HW4 Front Panel I/O Board, fan control and the USB hub.
7.2.4.4 I
2
C Addresses
Four I
2
C devices and their addresses are listed in Table 40 and Table 41. The following I
2
C
devices can be addressed on or through the SCSI Backplane Board:
Hot Swap microcontroller (HSC)
FRU EEPROM
Temperature sensor
Fan controller
Table 40. I
2
C Local Bus Addresses
Device Address Bus/Location Description
AT24C02 0xA0 Legacy I
2
C/SCSI Backplane
Board Board
Private SCSI Backplane Board Board FRU
EEPROM
DS75 0x90 Legacy I
2
C /SCSI Backplane
Board Board
Private SCSI Backplane Board Board
temperature sensor