Intel Intel NetStructure Single Board Computer, MPCBL0010 manual Ipmc Block Diagram

MPCBL0010 SBC—Hardware Management Overview

Figure 22.	IPMC Block Diagram		￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿
	￿+￿￿,%%￿+￿￿￿￿￿￿		￿￿￿￿￿￿￿	￿￿(￿￿,1￿￿￿
		￿￿￿￿￿￿	￿￿￿￿￿￿￿￿￿￿￿￿￿2￿3￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿2￿￿￿(￿￿0!￿￿￿￿
	￿￿￿!￿￿￿￿￿￿		￿￿￿￿"￿￿ ￿￿￿￿￿￿￿￿￿￿		￿￿￿￿￿￿
	5￿￿￿￿"￿￿￿￿-￿￿￿￿￿￿￿.		￿￿￿￿￿￿		￿￿￿￿￿￿
	￿￿"￿￿￿￿￿￿￿￿￿0		￿￿$￿￿￿￿￿￿￿￿#%&￿￿￿￿￿￿$￿￿￿'#￿"			/%￿+￿￿(￿￿0)
	1￿/4￿￿￿￿￿2￿￿￿
	￿*￿￿/￿(	/	!"￿￿#￿￿￿￿"￿￿		+￿#￿￿#￿￿￿￿￿￿￿￿￿￿￿￿￿￿
						/%￿+￿￿(￿￿0*
					+￿#￿￿#￿￿￿￿￿￿￿￿￿￿￿￿￿￿
							￿￿￿￿￿￿￿￿

If an IPMB bus fault or IPMC failure occurs, IPMB isolators are used to switch and isolate the backplane/system IPMB bus from the faulted SBC board. Where possible, the IPMC activates the redundant IPMB bus to re-establish system management communication to report the fault.

The onboard DC voltages, currents, and temperature are monitored by the IPMC microcontroller. The IPMC will log an event into the ShMC SEL if any of the thresholds are exceeded.

To increase the reliability of the MPCBL0010 SBC management subsystem, an external watchdog supervisor is implemented only for the IPMC . The IPMC strobes the external watchdog at two-second intervals to ensure continuity of operation of the board’s management subsystem. If the IPMC ceases to strobe the watchdog supervisor, the watchdog isolates the IPMC from the IPMBs and resets the IPMC. The watchdog supervisor does not reset the payload power and the restart of the IPMC does not affect the payload. It restores the previous hot swap state and power level negotiated with the shelf manager. The watchdog timeout expires after six seconds if strobes are not generated. The external watchdog supervisor is not configurable and should not be confused with the IPMI v1.5 watchdog timer commands.

This external watchdog of the IPMC is implemented in a second microcontroller called the Firmware Upgrade Manager (FWUM). This microcontroller is responsible for monitoring the IPMC and for managing the IPMC fail safe firmware upgrade process.

Intel NetStructure® MPCBL0010 Single Board Computer
Technical Product Specification	October 2006
116	Order Number: 304120