BCM5345 Datasheet, PDF (2/2 Pages) Broadcom Corporation. – 25 PORT GIGABIT ETHERNET SWITCHING PROCESSOR

OVERVIEW
Shared Buffer
Serial
to
Parallel
Parallel
to
Serial
Output
Queueing
Buffer
Manager
MIB
Counters
Light
Management
To Microcontroller
Table
Management
Port
Manager
GMAC
G MAC
G MAC
L2 MAC
Table
VLAN
Table
G-Port
G-Port
G-Port
The Broadcom BCM5345 device is a highly integrated solution
providing connectivity for 25 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 Microcontroller 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 BCM5345 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 BCM5345 devices with aggregated Gigabit Ethernet links
between them.
The BCM5345 supports 25 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 speed and
full-duplex or half-duplex operation at 10/100 Mbps speed (using
10BASE-T/100BASE-T). The BCM5345 also offers one uplink port
with a GMII interface for light management or cascading purposes. 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 BCM5345 device offers a Microcontroller interface to support
lightly managed applications. All the required counters and frame-
trapping mechanisms are incorporated into the device.
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BROADCOM CORPORATION
16215 Alton Parkway, P.O. Box 57013
Irvine, California 92619-7013
© 2003 by BROADCOM CORPORATION. All rights reserved.
5345-PB01-R
09/26/03
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