BCM5345M
®
24 PORT GIGABIT ETHERNET SWITCHING PROCESSOR
FEATURES
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Supports 24 Gigabit Ethernet ports in wirespeed operation
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Gigabit Ethernet ports support RGMII interfaces to Standard
GE Transceivers
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On-chip L2 search table supports 8K MAC addresses
SUMMARY OF BENEFITS
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Enables a new generation of lower-cost switches with Gigabit
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Ethernet connectivity and much smaller form factors.
Complete switch on a chip integrates multilayer forwarding
and filtering logic and internal ARL tables and packet
buffering.
Filters and forwards traffic at full wirespeed on all 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 workgroup needs.
Supports 8K internal MAC addresses so even large, segmented
networks can be supported.
Supports Quality of Service (QoS) for prioritization of
different traffic types.
Full support of VLANs allows separation of user groups and
minimizes superfluous traffic.
Jumbo frame support allows the device to be connected to
corporate server farms and networks while maintaining
maximum TCP/IP performance.
Supports the latest standards used in corporate networks for
discovery, management, access control, and traffic control.
On-chip MIB registers allows the collection and transmission
of statistics for each port and allows an upward migration path
for corporate users.
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Jumbo Frame support (9 Kbyte)
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Supports 4K VLAN address and 802.1s Multiple Spanning
Tree protocol
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Supports 802.1w Rapid Spanning Tree
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Supports 802.1p and/or DiffServ with four priority queues
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Supports 802.3ad link aggregation
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Supports selected MIB groups in RMON
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Supports up to 256 IP multicast groups
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Full-duplex and half-duplex operation with IEEE 802.3x flow
control and backpressure.
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On-chip 512 Kbyte packet buffer memory with sophisticated
buffer management.
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Offers per-port rate control
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Supports 802.1x access control protocol
Built in 32-bit, 33-MHz PCI bus interface
Extremely low power consumption (4W)
Packaged in 676-pin BGA
24 Gigabit Ethernet Ports for SOHO and Subnetwork Applications
PCs
Gigabit Ethernet Uplink
Copper or Fiber
Printer
Cable/DSL/Wireless
Router
Gigabit Ethernet Server
PCs
IP Phones
OVERVIEW
O u t p ut
Qu e ue i n g
S h ar ed B u f f er
B uf f e r
Ma n ag er
MIB
C o un t e rs
PCI
I nt e rf a c e
To CPU
Tx FIFO
Rx FIFO
Se r i al
to
P a ra lle l
P ar al l e l
to
Se ri al
Ta bl e
Man ag e m en t
P or t
Man ag e r
L2 MA C
Ta bl e
Rx FIFO
Rx FIFO
Rx FIFO
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.
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.
Tx FIFO
Tx FIFO
Tx FIFO
V L AN
Ta bl e
G MA C
G MAC
G MA C
G-Port
G-Port
G-Port
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.
®
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
Phone: 949-450-8700
Fax: 949-450-8710
E-mail: info@broadcom.com
Web: www.broadcom.com
Analog electronics
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