BCM5345M
®
24 PORT GIGABIT ETHERNET SWITCHING PROCESSOR
24 Gigabit Ethernet Ports for SOHO and Subnetwork Applications
•Supports 24 Gigabit Ethernet ports in wirespeed operation
•Gigabit Ethernet ports support RGMII interfaces to Standard
GE Transceivers
•On-chip L2 search table supports 8K MAC addresses
•Jumbo F r ame support (9 KB)
•Suppo r ts 4K VLAN address and 802.1s Multiple Spanning
Tree protocol
•Supports 802.1w Rapid Spanning Tree
•Supports 802.1p and/or DiffServ with four priority queues
•Supports 802.3ad link aggregatio n
•Supports selected MIB groups in RMON
•Supports up to 256 IP multicast grou ps
•Full-duplex and half-duplex operation with IEEE 802.3x flow
control and backpressure.
•On-chip 512kByte packet buffer memory with sophisticated
buffer management.
•Offers per-port rate control
•Supports 802.1x access contro l protocol
•Built in 32-bit, 33-MHz PCI bus interface
•Extremely low po wer co nsum ptio n (4W)
•Packaged in 676- pin BGA
•Enables a new generation o f lower cost switch es with Gigabit
Ethernet connectivity and much smaller form factors.
•Complete switch on a chip integrates multi-layer forwarding
and filtering logic and in ternal ARL tables and p acket
buffering.
•Filters and forwards traffic at full wire speed on a ll 24 ports at
all layers of functionality. This equates to 48 Gbps of
bandwidth.
•Provides the most cost effective Gigabit Ethernet connectivity
to the desktop for all remote and branch office as well as
enterprise wo rkgroup needs.
•Supports 8K internal MAC addresses so even large, segmented
networks can be supported
•Supports Qualit y of Service (QoS) for prioritization of
different traffic types
•Full su pport of VLANs allows separation of us er groups and
minimizes superfluous traffic
•Jumbo frame support allows the device to be connected to
corporate server farms and netwo rks while maintaining
maxi mu m T CP/I P pe rformanc e
•Supports the latest standards used in corporate networks for
discovery, management, access control, and traffic contro l
•On-chip MIB registers allows the collection and transmission
of statistics for each port and allows an upward migration path
for corporate users.
FEATURES SUMMARY OF BENEFITS
Cable/DSL/Wireless
Router
Printer
IP Phones
PCs
PCs
Gigabit Ethernet Server
Gigabit Ethernet Uplink
Copper or Fiber
OVERVIEW
®
Phone: 949-450-8700
Fax: 949-450-8710
E-mail: info@broadcom.com
Web: www.broadcom.com
BROADCOM CORPORATION
16215 Alton Parkway, P.O. Box 57013
Irvine, California 92619-7013
© 2003 by BROADCOM CORPORATION. All rights reserved.
5345M-PB01-R 09/26/03
Broadcom®, the pulse logo, and Connecting everything® are trademarks of Broadcom Corporation and/
or its subsidiaries in the United States and certain other countries. All other trademarks mentioned are the
property of their respective owners.
The Broadcom BCM5345M device is a highly integrated solution
provid ing connec tivity for 24 por ts of Gi gabit Ethern et. I t combin es all
the functions of a high-speed switch system, including packet buffer,
media access controllers, address management, and a nonblocking
switch fabric as well as a CPU interface into a single 0.13 µm CMOS
device. It complies with IEEE 802.3, 802.3u, 802.3ab 802.3x
specifications, including the MAC control, pause frame, and auto-
negotiation subsections, providing compatibility with all industry-
standard Ethernet, Fast Ether net, and Gigabit Eth e rnet devices.
The BCM5345M is ideal for applications such as Gigabit Ethernet
workgroup switch es, desk top switches, and d ata cen ter switch es. While
configurations of 24 Gigabit Ethernet ports can be achieved with only
one switch device, configurations of up to 48 ports can be built using
multiple BCM5345M devices with aggregated Gigabit Ethernet links
between them.
The BCM 5345M supports 24 Gigabi t Ethernet p orts in a singl e device
with all ports in wirespeed operation. It offers 24 ports of RGMII
(802.3ab, 1000BASE-T) interfaces with full-duplex operation at Gigabit
Ethernet speed and full-duplex or half-duplex operation at 10/100 Mbps
speed (using 10BASE-T/100BASE-T). It forwards Ethernet frames with
lengths between 64 bytes and 9216 bytes based on L2 MAC address
lookups in the 8k entry on-chip MAC address table with automatic
learning and aging support. The device supports 4 levels of priority that
can be eit her a ssign ed fr om the 80 2. 1p u ser prior ity b its or the TO S f ield
for Differentiated Services. The device also supports MAC access
control (802.1x) as well as port trunking (802.3ad). In addition,
individual ports can be rate controlled in 16 steps down to 64kbps.
The BCM5345M device offers an integrated PCI bus to support fully
managed applications. All the required counters and frame trapping
mechanisms as well as the DMA support are incorporated into the
device.
Shared Buf f er
Output
Queueing
Buffer
Manager
MI B
Counters
PCI
Interface
Serial
to
Parallel
Parallel
to
Serial
Tx FIFO
Rx FIFO
Table
Management
L2 MAC
Table
VLAN
Table
Tx FIFO
Rx FIFO
GMAC
Tx FIFO
Rx FIFO
Tx FIFO
Rx FIFO
G MAC G MAC
Port
Manager
G-Port G-Port G-Port
To C PU
