Design Guide

I/O Subsystem
R
224 Intel
®
855GM/855GME Chipset Platform Design Guide
82540EP Gigabit Ethernet Controller, Intel
®
82551QM Fast Ethernet Controller, Intel
®
82562ET, and
Intel
®
82562EM Platform LAN Connect components.
Table 94. LAN Component Connections/Features
LAN Component Interface to
ICH4-M
Connection Features
Intel
®
82540EP (196 BGA) PCI Gigabit Ethernet
(1000BASE-T) with
Alert Standard Format
(ASF) alerting
Gigabit Ethernet, ASF 1.0
alerting, PCI 2.2 compatible
Intel
®
82551QM (196 BGA) PCI Performance 10/100
Ethernet with ASF
alerting
Ethernet 10/100 connection,
ASF 1.0 alerting, PCI 2.2
compatible
Intel
®
82562EM (48 Pin SSOP) LCI Advanced 10/100
Ethernet
Ethernet 10/100 connection,
Alert on LAN* (AoL)
Intel
®
82562ET (48 Pin SSOP) LCI Basic 10/100 Ethernet Ethernet 10/100 connection
Design guidelines are provided for each required interface and connection.
11.9.1. Footprint Compatibility
The Intel 82540EP Gigabit Ethernet Controller and the Intel 82551QM Fast Ethernet Controller are all
manufactured in a footprint compatible 15 mm x 15 mm (1-mm pitch), 196-ball grid array package.
Many of the critical signal pin locations on the 82540EM and the 82551QM are identical, allowing
designers to create a single design that accommodates any one of these parts. Because the usage of some
pins on the 82540EM differ from the usage on the 82551QM, the parts are not referred to as “pin
compatible”. The term “footprint compatible” refers to the fact that the parts share the same package
size, same number and pattern of pins, and layout of signals that allow for the flexible, cost effective,
multipurpose design.
Design guidelines are provided for each required interface and connection. Refer to the following
figures and the subsequent table for the corresponding section of this design guide.
Figure 112. Intel 82801DBM ICH4-M/Platform LAN Connect Section
B
82551QM
PCI
Intel
®
ICH4
Magnetic
Module
Connector
A
82540EP
Refer to the PCI
Specification
82562EM/
82562ET
Refer to the selected Intel
LAN component
C