© 2002 National Semiconductor Corporation

November 2002

Revision 1.4

PC87431M/S/C

mini-Baseboard Management Controller (mBMC)

General Description

Baseboard Management Controllers (mBMC) is a light ver-

sion of the IPMI v1.5 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,

Chassis Management interface, Bi-color LED control, an in-

tegrated flash, Fan control, 12 ADC channels, and Digital

Input Event and General-Purpose Output pins.

The PC87431x interfaces with the host via a slave SMBus

interface; it interfaces with the LAN On Motherboard (LOM)

and with peripherals via two independent master SMBus in-

terfaces.

The PC87431x also supports distributed management archi-

tecture via the Intelligent Platform Management Bus (IPMB).

In addition, the PC87431x includes an inhibit strap to en-

able the system to work with the daughter board of an ad-

vanced BMC.

The PC87431x, like other members of National’s Advanced

I/O family, is PC01 and ACPI compliant

Outstanding Features

s

Canned solution

s

LAN commands follow IPMI v1.5

s

MD5 secure authentication

s

Support for a variety of popular LOMs

s

Field Replaceable Unit (FRU) Inventory

s

System Event Log (SEL)

s

Sensor Data Record (SDR) Repository

s

Platform Event Filtering (PEF)

s

Remote secure reset, Power On/Off

s

Remote settable BIOS boot options

s

BIOS Alerting interface

s

System health monitoring using SMBus-based sensors

s

LAN Alerting in PET format

s

Watchdog Timer

s

Host, LOM and Peripheral interfaces, via SMBus

s

Intelligent Platform Management Bus (PC87431C)

s

Digital Input Event pins and General-Purpose Output pins

s

Integrated Fan control and ADC (PC87431S/C)

s

Integrated flash, to reduce system cost

s

Two LEDs, with Bi-color LED control

s

Inhibit strap, to enable the system to work with the

daughter board of an advanced BMC

SMBus/IPMB

SMBAlert

PC87431x

mini-Baseboard Management

Controller

LAN On

Motherboard

(LOM)

10 MHz

SMI NMI

General-Purpose

Input Events

PC87417

ServerI/O

RJ-45

Peripheral SMBus

Host

TRIS

PWBTN

RSTOUT

LEDs

Sensor Devices

SMBAlert

LOM SMBus

PC87431x System Connection Diagram

Notes: IPMB interface is supported by PC87431C only.

=

Optional

Integrated ADC and Fan are supported by PC87431S/C only.

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All other brand or product names are trademarks of their respective holders.

Output and Digital