Product guide

20
Chapter Two System Features
Use DIMMs that have been tested for compatibility with the server board. Contact
your Micron sales representative or dealer for a current list of approved memory
modules.
Note
440GX Host Bridge / Memory
Controller
The L440GX+ is designed around the Intel
®
82440GX AGPSet (440GX). This
device provides 100 MHz processor host bus interface support, DRAM controller,
PCI bus interface, AGP interface (used on L440GX+ for PCI-66/5V), and power
management functions. The host bus/memory interface in the 440GX is optimized
for 100 MHz operation, using 100 MHz SDRAM main memory. The PCI interface is
PCI 2.1-compliant, providing a 33 MHz / 5V signaling environment for embedded
controllers and slots in the single PCI segment on L440GX+. The 440GX memory
controller supports up to 2 GB of ECC or Non-ECC memory, using PC/100
compliant Synchronous DRAM (SDRAM) devices on DIMM plug-in modules. ECC
can detect and correct single-bit errors, and detect multiple-bit errors.
Peripherals
Super I/O Chip
The National
®
87309 device supports two serial ports, one parallel port, diskette
drive, PS/2-compatible keyboard and mouse. The server board provides a
connector interface for each port.
Serial Ports
Each serial port can be set to one of four different COMx ports and can be enabled
separately. When enabled, each port can be programmed to generate edge or level
sensitive interrupts. When disabled, serial port interrupts are available to add-in
boards.
Parallel Port
The 87309 provides one IEEE 1284-compatible 25-pin bidirectional EPP (supporting
levels 1.7 and 1.9). BIOS programming of the 87309 registers enable the parallel
port and determine the port address and interrupt. ECP mode is supported with two
possible DMA channels. When disabled, the interrupt is available to add-in boards.
Add-in Board Slots
The server board has one full-length ISA bus connector. ISA features:
q Bus speed up to 8.33 MHz
q 16-bit memory addressing
q Type A transfers at 5.33 Mbps
q Type B transfers at 8 Mbps
q 8 or 16-bit data transfers
q Plug and Play ready