BCM5327M
®
EIGHT-PORT 10/100 SWITCH WITH ON-CHIP PACKET BUFFER
FEATURES
•
The highest level of silicon integration achieved for a eight-
port 10/100 Ethernet switch device
SUMMARY OF BENEFITS
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Enables a new generation of lower cost 10/100 switches in
much smaller form factors
•
Fourth generation switch on a chip
•
The BCM5327M integrates:
•
•
•
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Eight transceivers (802.3u compliant)
Nine media access controllers (802.x compliant)
256-KB packet buffer
Non-blocking switch fabric
•
Utilizes field-proven industry-standard 10BASE-T/100BASE-
TX Fast Ethernet transceivers—lowering overall system
interoperability and reliability risks
•
Flexible interfaces support a wider variety of application
needs—fiber for long distances or an additional 100TX port
•
Sufficient address range handles all remote office, branch
office and home office needs
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Packet classification 802.1p QoS priority queues
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Port-based VLAN
•
MII or 7-wire interface supports an additional 100FX or 100TX
connection enabling a sixth user connection or uplink
•
Port VLAN, trunking, and 802.1p priority enables the switch to
be designed into a wide variety of applications
•
CPUs are not required to initialize and run in cost-sensitive
unmanaged applications—providing true Plug and Play
connectivity
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Supports up to 4K MAC addresses
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Flow control: full-duplex (802.3x) and half-duplex options
supported
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Internal oscillator circuit simplifies design and reduces
overall system cost
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Supports automatic address learning and aging
Internal oscillator circuit
Typical power consumption: < 1.8W
208-pin PQFP package
Management features:
•
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Low-cost MIB Autocast
TM
function
Hardware support for Simple Network Management Protocol
(SNMP), Remote Network Monitoring (RMON) and Spanning
Tree
•
Ability to gather and support basic management statistics
with only a very low-cost microcontroller
•
Low-cost management using the on-chip MIB registers allows
the collection and transmission of statistics for each port and
provides an upward migration path for corporate users
•
On-chip HP auto-MDI/MDIX feature automatically detects and
corrects for crossover cables and allows direct switch-to-
switch connection
Low Cost Managed Eight-Port 10/100 Smart Switch
OVERVIEW
MDI/MDIX
MDI/MDIX
MDI/MDIX
MDI/MDIX
MDI/MDIX
MDI/MDIX
MDI/MDIX
MDI/MDIX
MII or 7-wire
Interfac e
10/100 P HY
10/100 P HY
10/100 P HY
10/100 P HY
10/100 P HY
10/100 P HY
10/100 P HY
10/100 P HY
MA C
MIB R egis ters
MA C
MA C
MA C
MA C
MA C
MA C
MA C
MA C
S witc h F abric
and A R L L ogic
P riority Mapping
R egis ter 802.1p
DMA Interfac e
256-K B P ac ket B uffer
C P U or
E 2P R OM Interfac e
S P I/C P U
Interfac e
L E D Interfac e
L E DS
The Broadcom BCM5327M device is a highly integrated solution. It
combines all the functions of a high-speed switch system—including
packet buffer, PHY transceivers, media access controllers, address
management, and a non-blocking switch fabric—into a single 0.18µ
CMOS device. It complies with the IEEE 802.3, 802.3µ, and 802.3x
specifications, including the MAC control PAUSE frame and auto-
negotiation subsections, providing compatibility with all industry-standard
Ethernet and Fast Ethernet devices.
This device contains eight full-duplex 10BASE-T/100BASE-TX Fast
Ethernet transceivers, each of which performs all of the physical layer
interface functions for 10BASE-T Ethernet on Category 3, 4, or 5
Unshielded Twisted Pair (UTP) cable and 100BASE-TX Fast Ethernet on
Category 5 UTP cable.
SPI or E2PROM interfaces provide easy programming of the 802.1p QoS
queues. This allows switch traffic to be given different classes of priority or
service, for example, voice traffic for IP phone applications, video traffic for
multimedia applications, or data traffic for e-mail applications.
Even though this device is primarily targeted for the cost-sensitive
unmanaged market, very low-cost management can also be provided
utilizing the proprietary MIB Autocast™ function. MIB Autocast
encapsulates the on-chip MIB statistics and sends them out automatically
on a predefined port (or ports) at programmed intervals. This feature
eliminates the need for a costly CPU and simplifies the management
interface.
Using this mode, the BCM5327M periodically transmits a legal Ethernet
frame on a designated port. The frames can be intercepted by an external
management probe or a dedicated network management application,
resident on any node within the network. This function requires only a
small, low-cost microcontroller to initialize and configure the device.
The BCM5327M provides an on-chip MIB statistics register to collect,
receive, and transmit statistics for each port. Additionally it provides direct
hardware support for the EtherLike MIB, Bridge MIB, MIB II (interfaces)
and the first four groups of the RMON MIB. All nine groups of RMON can
be supported by using additional capabilities, such as port mirroring/
snooping, together with an external microcontroller to process some MIB
attributes. The MIB registers can be accessed through the serial
management port by an external microcontroller.
Broadcom
®
, the pulse logo,
MIB Autocast™,
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
© 2004 by BROADCOM CORPORATION. All rights reserved.
5327M-PB05-R
07/13/04
Phone: 949-450-8700
Fax: 949-450-8710
E-mail: info@broadcom.com
Web: www.broadcom.com
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