•The world’s first single-chip switch
•The highest level of silicon integration achieved for an
8-port 10/100 Ethernet switch device:
• Eight transceivers (802.3u compliant)
• Nine media access controllers (802.x compliant)
• 256 KB packet buffer
• Non-blocking switch fabric
•Non-blocking up to 24 ports through a 2.6-Gbps
expansion port, cascading up to three devices
•MII interface supports an additional 100FX or 100TX
connection, enabling a ninth user port
•Supports up to 4K MAC Addresses
•Flow control: full-duplex (802.3x) and half-duplex
options supported
•Supports automatic address learning and aging
•Typical power consumption: 2.8W
•208-pin PQFP package
•Optional management features:
• Low-cost MIB AutocastTM function
• Hardware support for Simple Network Management
Protocol (SNMP), Remote Network Monitoring (RMON)
and Spanning Tree
BCM5318 FEATURES
24-Port Unmanaged 10/100 Switch
•Enables a new generation of lower cost 10/100 switches
in much smaller form factors.
•Utilizes field-proven industry-standard
10BASE-T/100BASE-TX Fast Ethernet
transceivers–lowering overall system
interoperability and reliability risks.
•Flexible interfaces support a wider variety of
application needs–fiber for long distances or an
additional 100TX port.
•Sufficient address range handles all remote office,
branch office and home office needs.
•Flexible architecture enables high engineering leverage
when designing multiple platforms.
•CPUs are not required to initialize and run in cost-
sensitive unmanaged applications–providing true
Plug and Play connectivity.
•Very low power and small footprint enables more cost-
effective system options.
•Ability to gather and support basic management
statistics with only a very low-cost microcontroller.
•Low-cost management via the on-chip MIB registers
allows the collection and transmission of statistics for
each port and allows an upward migration path for
corporate users.
•On-chip HP auto-MDI/MDIX feature automatically
detects and corrects for crossover cables and allows
direct switch-to-switch connection.
SUMMARY OF BENEFITS
8-PORT 10/100 SWITCH WITH ON-CHIP PACKET BUFFER
BROADCOM PROPRIETARY & CONFIDENTIAL
®
PRODUCTPRODUCT
BriefBrief
BCM5318
BCM5318 OVERVIEW
MDI/MDIX 10/100 PHY
MAC
MII Interface
CPU Interface SPI/CPU
Interface
MIB Registers
Switch Fabric
& ARL Logic
DMA Interface
256 KB Packet Buffer
LED Interface LEDs
10/100 PHY
10/100 PHY
10/100 PHY
10/100 PHY
10/100 PHY
10/100 PHY
10/100 PHYMDI/MDIX
MDI/MDIX
MDI/MDIX
MDI/MDIX
MDI/MDIX
MDI/MDIX
MDI/MDIX
MAC
MAC
MAC
MAC
MAC
MAC
MAC
MAC
Inter-Chip Expansion
The Broadcom BCM5318 device is a very highly integrated
solution. It combines all the functions of a high-speed switch
system–including packet buffer, PHY transceivers, media access
controllers, address management and a non-blocking switch
fabric–into a single 0.22µCMOS device. It complies with the
IEEE 802.3, 802.3µand 802.3x specifications, including the
MAC control PAUSE frame and auto-negotiation subsections,
providing compatibility with all industry-standard Ethernet and
Fast Ethernet devices.
This device contains eight full-duplex 10BASE-T/100BASE-TX
Fast Ethernet transceivers, each of which performs all of the
physical layer interface functions for 10BASE-T Ethernet on
Category 3, 4, or 5 unshielded twisted pair (UTP) cable and
100BASE-TX Fast Ethernet on Category 5 UTP cable.
Even though this device is primarily targeted for the
cost-sensitive unmanaged market, very low cost management
can also be provided utilizing the proprietary MIB Autocast™
function. MIB Autocast encapsulates the on-chip MIB statistics
and sends them out automatically on a predefined port (or ports)
at programmed intervals. This feature eliminates the need for a
costly CPU and simplifies the management interface.
Using this mode, the BCM5318 periodically transmits a legal
Ethernet frame on a designated port. The frames can be
intercepted by an external management probe or a dedicated
network management application, resident on any node within
the network. This function requires only a small, low-cost
microcontroller to initialize and configure the device.
The BCM5318 provides an on-chip MIB statistics register to
collect, receive, and transmit statistics for each port. Additionally
it provides direct hardware support for the EtherLike MIB,
Bridge MIB, MIB II (interfaces) and the first four groups of the
RMON MIB. All nine groups of RMON can be supported by
using additional capabilities, such as port mirroring/snooping,
together with an external microcontroller to process some MIB
attributes. The MIB registers can be accessed through the serial
management port by an external microcontroller.
®
Phone: 949-450-8700
FAX: 949-450-8710
Email: info@broadcom.com
Web: www.broadcom.com
Broadcom®, the pulse logo, MIB AutocastTM, and Connecting everything®are trademarks of
Broadcom Corporation and/or its subsidiaries in the United States and certain other countries.
All other trademarks are the property of their respective owners.
BROADCOM CORPORATION
16215 Alton Parkway, P.O. Box 57013
Irvine, California 92619-7013
© 2003 by BROADCOM CORPORATION. All rights reserved.
5318-PB03-R-06.25.03
