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The following table lists the major components on the system board.
Component
Intel 440BX Chipset:
82443BX PCI/AGP controller (PAC)
82371EB PCI ISA IDE Xcelerator
(PIIX4E)
82558 LAN controller
Alert On LAN Component
Winbond 83782D monitoring chip
4-8 System Board
Two USB devices (a header on the system board is connected to an
external connector on the rear of the chassis; a header on the riser
board is connected to a USB board/connector at the front of the
chassis)
Speakers (line out) and microphone (microphone in).
System Board Components
Function
Provides bus control signals, address paths, and data paths for
transfers between the processor's host bus, PCI bus, AGP
connector, and system memory. The PAC comes in a 492-pin
BGA package on the system board.
Features include processor interface control (32-bit addressing,
66-MHz and 100-MHz host bus speed), an integrated DRAM
controller (synchronous DRAM, 64/72-bit path-to-memory, auto
detection of memory type) and an AGP interface (compliant with
AGP specification with data transfer rates up to 133 MHz), fully
synchronous minimum latency PCI bus interface (compliant with
PCI specification with PCI-to-DRAM access greater than 100 MB
per second).
Functions as a PCI to ISA bridge; PCI IDE functionality; a USB
controller; integrated dual channel enhanced IDE interface with
support for Ultra DMA/33; enhanced DMA controller; interrupt
controller based on 82C59, with support for 15 interrupts; power
management logic (sleep/resume and remote wake on LAN);
real-time clock with 256-byte, battery-backed CMOS static RAM
(SRAM); 16-bit counters based on 82C54.
Provides an Ethernet LAN interface for 10Base-T and 100Base-
TX connectivity. The controller features:
—CSMA/CD protocol engine
—PCI compatibility
—DMA engine for movement of command, status, and network
data across the PCI bus
—Standard MII interface for access to IEEE 802.3 compliant
physical layer interface.
The Alert On LAN Component is a companion device to the Intel
82558 LAN controller. Both devices work together to provide a
management interface between a remote management console
and a client system monitoring instrumentation. When an alert
occurs (a chassis intrusion, for example), the LAN component
transmits Ethernet packets to the 82558 LAN controller.
Provides voltage, temperature, and security monitoring (NEC
MagicEye technology).
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