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PC87431M
mini-Baseboard Management Controller (mBMC)
PC87431M/S
/H mini-Baseboar
nagement Cont
er June 2002
Revision 1.2
PC87431M/S/H
mini-Baseboard Management Controller (mBMC)
General Description The National Semiconductor® PC87431x family of mini-
Baseboard Management Controllers (mBMC) is a light ver-
sion of the IPMI v1.5 and DMTF/ASF BMC. It is targeted for
a wide range of remote-controlled platforms such as servers,
workstations, hubs and printers.
The PC87431x incorporates an embedded microcontroller,
three System Management Bus (SMBus® ) interfaces, a
Chassis Management interface, Bi-color LED control, an in-
tegrated E2 PROM, Fan control, 12 ADC channels, and
Digital Input Event and General-Purpose Output pins.
The PC87431x interfaces with the host via a slave SMBus in-
terface; it interfaces with the LAN On Motherboard (LOM) and
with peripherals via two independent master SMBus interfaces.
The PC87431H supports distributed management architec-
ture via an Intelligent Chassis Management Bus (ICMB).
In addition, the PC87431x includes an inhibit strap to enable the
system to work with the daughter board of an advanced BMC.
The PC87431x, like members of National’s Advanced I/O
family, is PC01 and ACPI compliant
Outstanding Features Canned solution LAN commands follow IPMI v1.5, and ASF 1.03
(PC87431H) MD5 secure authentication Support for a variety of popular LOMs Field Replaceable Unit (FRU) Inventory System Event Log (SEL) Sensor Data Record (SDR) Repository Remote secure reset, Power On/Off Remote settable BIOS boot options ICMB interface (PC87431H) BIOS Alerting interface System health monitoring using SMBus-based sensors LAN Alerting in PET format Watchdog Timer Digital Input Event pins and General-Purpose Output pins Integrated Fan control and ADC (PC87431S/H) Host, LOM and Peripheral interfaces, via SMBus Integrated E2 PROM, to reduce system cost Two LEDs, with Bi-color LED control Inhibit strap, to enable the system to work with the
daughter board of an advanced BMC
SMBusSMBAlert
PC87431x
mini-Baseboard Management
Controller
LOMCC
10 MHz SMI IRQ
General-Purpose
Input Events
PC87417
ServerI/O
RJ-45
Peripheral SMBus
HostTRIS
PWBTN
RSTOUT
LEDs
ASF, LMxx
(LM85/87/88/90)
SMBAlert
LOM SMBus
PC87431x System Connection DiagramNote: ICMB interface is supported by PC87431H only.
= Optional
Fans VIN
RS-485
ICMB Integrated ADC and Fan are supported by PC87431S/H only.
USARTOutput and Digital
Advance InformationADVANCE INFORMATION
