ADLINK aTCA-N700 - Manual (Page 53)

aTCA-N700 HW Users Guide
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9. Blade Management Subsystem
The Intelligent Management Controller (IPMC) sits at the center of the blade
management architecture. The IPMC enables hot-swap, E-keying, power management,
environment/device monitoring and management with or without the ATCA Shelf
Manager. The IPMC is initialized as soon as the dedicated power is supplied, and
works completely independent of the LMP. Since the dedicated power is separate from
the main power for other devices, the IPMC can work when the power to the other
devices are not supplied.
The IPMC has embedded flash memory, RAM, and System Event Log memory and
multiple I2C bus interfaces for interconnection to other devices. The firmware for the
IPMC is saved into the flash. The serial port connected to the IPMC enables access to
all management information and commands.
The Field Replacement Unit (FRU) information is saved into the EEPROM, which is
connected to the IPMC through an I2C interface. Two I2C buses are provided as a
redundant connection for the IPMB bus to the backplane to communicate with the Shelf
Manager. One I2C bus is reserved for the RTM MMC connection. The remaining I2C
bus is used to monitor the sensors, the power modules, and to read from or write to the
EEPROM in master-only mode. During monitoring, when one of the monitored values
goes over the threshold, the IPMC reports to the Shelf Manager for the event.
When a fault is detected on one of the redundant IPMB buses, the IPMC isolates the
troublesome bus and re-establishes the communication path again on the new IPMB
bus.
Shown in
Figure 9-1 is the structure of the IPMC block. The IPMC on the board is Smart
Fusion A2F500, a SmartFusion Customizable System-on-Chip (cSOC) from Microsemi
(formerly Actel). The IPMC and the CPLD form a key functional block for the ATCA
blade management tasks.
Figure 9-1 IPMC Block
The IPMC block interconnections are summarized as: