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Intel® SHG2 DP Server Board Technical Product Specification Server Management
Revision 1.0 Intel Order Number C11343-001
33
5.3 Intelligent Platform Management Buses
Management controllers (and sensors) communicate on the I
2
C-based IPMB. A bit protocol,
defined by the I
2
C Bus Specification, and a byte-level protocol, defined by the Intelligent
Platform Management Bus Communications Protocol Specification, provide an independent
interconnect for all devices operating on this I
2
C bus.
The IPMB extends throughout the server board and system chassis. An added layer in the
protocol supports transactions between multiple servers on inter-chassis I
2
C bus segments.
Table 20: IPMB Bus Devices
Function Voltage Address Notes
SCSI HSBP-A 5V 0xC0
SCSI HSBP-B 5V 0xC2
Front Panel Connector 5VSB 0x9A
IPMB Connector 3VSB TBD Depends on plug-in card
In addition to the “public” IPMB, the Sahalee BMC also has five private I
2
C buses that are used
on the baseboard. The Sahalee BMC is the only master on the private buses. The following
tables list all server board connections to the Sahalee BMC private I
2
C buses.
Table 21. Private I
2
C* Bus 1 Devices
Function Voltage Address Notes
PCI Slot 1 3VSB TBD Depends on plug-in card
PCI Slot 2 3VSB TBD Depends on plug-in card
PCI Slot 3 3VSB TBD Depends on plug-in card
PCI Slot 4 3VSB TBD Depends on plug-in card
PCI Slot 5 3VSB TBD Depends on plug-in card
PCI Slot 6 3VSB TBD Depends on plug-in card
Table 22: Private I
2
C* Bus 2 Devices
Function Voltage Address Notes
CMIC-LE 2.5 V 0xC0 North Bridge
CIOB-X2 2.5 V 0xC4 I/O Bridge
CSB5 3.3 V 0xC2 South Bridge
DIMM 1 2.5 V 0xA0 DIMM1A
DIMM 2 2.5 V 0xA2 DIMM1B
DIMM 3 2.5 V 0xA4 DIMM2A
DIMM 4 2.5 V 0xA6 DIMM2B
DIMM 5 2.5 V 0xA8 DIMM3A
DIMM 6 2.5 V 0xAA DIMM3B