Intel® Server Board SE7520AF2 TPS
Platform Management
Revision 1.2
159
Intel order number C77866-003
The following figure is a block diagram of the mBMC as it is used in a server management
system. The external interface blocks to the mBMC are the discrete hardware peripheral device
interface modules.
Figure 37. mBMC in a Server Management System
6.2.1 mBMC
Self-test
The mBMC performs various tests as part of its initialization. If a failure is determined, the
mBMC stores the error internally. A failure may be caused by a corrupt mBMC FRU, SDR, or
SEL. The
IPMI 1.5
Get Self Test Results
command can be used to return the first error
detected.
Executing the
Get Self Test Results
command causes the mBMC self-test to be run. It is
strongly recommended to reset the mBMC via the
Cold Reset
command afterwards.
6.2.2 SMBus
Interfaces
The mBMC incorporates one slave and two master-only SMBus interfaces. The mBMC
interfaces with the host through the slave SMBus interface. It interfaces with the LAN On
Motherboard (LOM) and peripherals through two independent master bus interfaces.
6.2.3
External Interface to mBMC
Figure 38 shows the data/control flow to and within the functional modules of the mBMC.
External interfaces from the host system, LOM, and peripherals, interact with the mBMC
through the corresponding interface modules as shown.
SMBus
mBMC ASIC
Bus Interface
Unit
SMBus
GPIO Pins
one SMBus
Interfaces
Flash
Memory
SIO
LAN on
Motherboard
(LOM)
Interface
General
purpose Output
and Digital
Input
Front Panel
and Power Stat
Signal
Private I2C
Buses
Processor
Interrupt Pins
SMBus
Sensor devices