OV E R V I E W

®

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

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

providing connectivity for 24 ports of Gigabit Ethernet. It combines 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, and 802.3x

specifications, including the MAC control, pause frame, and auto-

negotiation subsections, providing compatibility with all industry-

standard Ethernet, Fast Ethernet, and Gigabit Ethernet devices.

The BCM5345M is ideal for applications such as Gigabit Ethernet

workgroup switches, desktop switches, and data center switches. 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 BCM5345M supports 24 Gigabit Ethernet ports in a single 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 four levels of priority

that can be either assigned from the 802.1p user priority bits or the TOS

field 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 64 kbps.

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.

S h ar ed B u f f er

Ou t p ut

Queuei ng

Buf f er

Manager

MIB

Co un t e r s

PCI

Inte r f a c e

Se r i al

to

P a ra lle l

Par al l el

to

Se r i al

Ta bl e

Managem en t

L2 MA C

Ta bl e

VLAN

Ta bl e

GMAC

G MAC

G MA C

Por t

Manager

G-Port

G-Port

G-Port

To CPU