• 16-bit PDH bus with reserved address space for the following:
— Flash memory
— Nonvolatile memory
— Scratch RAM
— Real-time clock
— UARTs
— External registers
— Firmware read/writable registers
— Two general purpose 32-bit registers
— Semaphore registers
— Monarch selection registers
— Test and reset register
• Reset and INIT generation
Field Programmable Gate Array
The Field Programmable Gate array (FPGA) provides ACPI and LPC support for the PDH bus
and provides these features:
• ACPI 2.0 interface
• LPC bus interface to support BMC
• Decoding logic for PDH devices
BMC
The BMC supports the industry-standard Intelligent Platform Management Interface (IPMI)
specification. This specification describes the management features that have been built into the
system board. These features include: diagnostics (both local and remote), console support,
configuration management, hardware management and troubleshooting.
The BMC provides the following:
• Compliance with IPMI 1.0
• Tachometer inputs for fan speed monitoring
• Pulse width modulator outputs for fan speed control
• Push-button inputs for front panel buttons and switches
• One serial port, multiplexed with the system console port
• Remote access and intelligent chassis management bus (ICMB) support
• Three I
2
C master/slave ports (one of the ports is used for intelligent platform management
bus (IPMB)
• Low Pin Count (LPC) bus provides access to three Keyboard Controller Style (KCS) and
one-Block Transfer (BT) interface
• 32-bit ARM7 RISC processor
• 160-pin Low Profile Flat Pack (LQFP) package
• Firmware is provided for the following interfaces:
— IPMI
— IPMB
SCSI Controller
The SCSI controller is a LSI Logic 53C1030 chip. This chip is fully compliant with the SCSI
Peripheral Interface-4 Specification (SPI-4). It has two independent SCSI channels supporting
devices at speeds up to 320 MB/seconds each. The 53C1030 adheres to the PCI-X addendum, to
the PCI Local Specification, and is hard-wired to PCI ID 1 which corresponds to bit 17 of the PCI
AD bus.
28 Overview
