Intel MPCMM0002 manual Physical Bus Number Mapping, Ipmb Signal Physical Bus Number

MPCMM0002 CMM—Guidelines for Third Party Chassis Vendors

Table 28.	Physical Bus Number Mapping
	IPMB Signal	Physical	IPMB Signal	Physical
		Bus Number		Bus Number
	BP_N_SDA_[1]_A	1	BP_N_SDA_[1]_B	22
	BP_N_SDA_[2]_A	2	BP_N_SDA_[2]_B	23
	BP_N_SDA_[3]_A	3	BP_N_SDA_[3]_B	24
	BP_N_SDA_[4]_A	4	BP_N_SDA_[4]_B	25
	BP_N_SDA_[5]_A	5	BP_N_SDA_[5]_B	26
	BP_N_SDA_[6]_A	6	BP_N_SDA_[6]_B	27
	BP_N_SDA_[7]_A	7	BP_N_SDA_[7]_B	28
	BP_N_SDA_[8]_A	8	BP_N_SDA_[8]_B	29
	BP_N_SDA_[9]_A	9	BP_N_SDA_[9]_B	30
	BP_N_SDA_[10]_A	10	BP_N_SDA_[10]_B	31
	BP_N_SDA_[11]_A	11	BP_N_SDA_[11]_B	32
	BP_N_SDA_[12]_A	12	BP_N_SDA_[12]_B	33
	BP_N_SDA_[13]_A	13	BP_N_SDA_[13]_B	34
	BP_N_SDA_[14]_A	14	BP_N_SDA_[14]_B	35
	BP_N_SDA_[15]_A	15	BP_N_SDA_[5]_B	36
	BP_N_SDA_[16]_A	16	BP_N_SDA_[16]_B	37
	BP_CF_SDA_A	17	BP_CF_SDA_B	38
	BP_SH_SDA_A	18	BP_SH_SDA_B	39
	BP_RED_SDA_A	19	BP_RED_SDA_B	40
	BP_RP_SDA_A	20	BP_RP_SDA_B	41
	BP_SP_SDA_A	21	BP_SP_SDA_B	42

Among the 42 IPMB buses, two buses, 18 and 39 (signals BP_SH_SDA_A and

BP_SH_SDA_B respectively in Table 28), have a special feature. Each bus is wired to an LTC4300 (IPMB bus isolator) part before making to the backplane. The IPMB bus isolator allows detection of bus hangs. Intel highly recommends using these buses (in a redundant mode) for chassis that use a shared bus topology. Figure 34 shows the radial bus topology. Figure 35 shows the shared bus topology.

IPMB buses BP_RED_SDA_A/ BP_RED_SDA_B (physical bus number 19 and 40) are reserved to be used as a dedicated redundant connection between two CMMs in the chassis.

IPMB buses BP_CF_SDA_A/BP_CF_SDA_B (physical bus number 17 and 38) are intended to be used as a dedicated redundant IPMB buses between CMMs and chassis FRU.

IPMB buses BP_SP_SDA_A/BP_SP_SDA_B & BP_RP_SDA_A/BP_RP_SDA_B are reserved for future use, however they can be configured by chassis vendors as any general purpose IPMB buses in redundant or individual configuration.

Intel NetStructure® MPCMM0002 Chassis Management Module
Hardware TPS	July 2007
64	Order Number: 309247-004US