BCM5345M データシートの表示（PDF） - Broadcom Corporation
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BCM5345M Datasheet PDF : 2 Pages
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OVERVIEW
Shared Buf f er
Serial
to
Parallel
Parallel
to
Serial
Output
Queueing
Buf f er
Ma n a g e r
MI B
C ount ers
PCI
To CPU
Interf ace
Table
Managem ent
Port
Manager
G MA C
G MAC
G-Port
G-Port
G MAC
G-Port
L2 MAC
Table
VLAN
Table
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.
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.
®
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
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