bcm5631 Broadcom Corp., bcm5631 Datasheet - Page 2

• Manufacturer Part Number: bcm5631
• Description: 12 Gigabit Port Switching Processor
• Manufacturer: Broadcom Corp.

The BCM5631 switching processor chip supports 12-Gigabit ports with
all ports in wirespeed operation. The BCM5631 is ideal for applications
such as multi-Gigabit port switches or aggregating multiple-Gigabit
ports.
For Gigabit ports, the BCM5631 supports PCS (802.3z, 1000BASE-X)
or GMII (802.3ab, 1000BASE-T) interfaces with full-duplex operation
at Gigabit speed, and full- or half-duplex operation at 10/100 Mbps speed
(using 1000BASE-T).
The BCM5631 supports 802.1Q VLAN tagging as an option (Qon). The
BCM5631 supports 802.1v VLAN Classification by Protocol. There are
four user-programmable protocols that can be set up per port by the
VLAN Classification EtherType and the VLAN Priority/TAG registers.
The BCM5631 supports both port-based and tagged (802.1q and
802.3ac) Virtual LAN (VLAN). The BCM5632 also supports 4K VLAN
addresses with the 802.1s Multiple Spanning Tree option, and flexible
and programmable ingress and egress checking rules for VLAN
processing.
The BCM5631 supports Ethernet frames with lengths from 64 bytes to
9KB. Runt or long frames are dropped at the input port. The minimum
Broadcom
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BROADCOM CORPORATION
16215 Alton Parkway, P.O. Box 57013
Irvine, California 92619-7013
© 2004 by BROADCOM CORPORATION. All rights reserved.
5631-PB01-R
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Inter-Packet Gap (IPG) is assumed to be 64-bit IDLE plus 32-bit
preamble. Packets with shorter than minimum IPG are not dropped, but
wirespeed performance is not guaranteed.
The BCM5631 also supports 802.3ad port aggregation. The 12-Gigabit
ports can form up to six trunks, with a maximum of twelve ports in a
trunk. The distribution algorithm is user-selectable. The Link
Aggregation Control Protocol (LACP) frames are handled by the
accompanying CPU and the marker protocol is handled in hardware.
The BCM5631 can be initialized and configured by an EEPROM or a
CPU, which is also responsible for search table updates and management
functions. The CPU is a separate port to the device, containing its own
Tx FIFO and Rx FIFO. The device implements a 32-bit, 33-MHz
peripheral component interconnect (PCI) for flexible CPU selection and
interface.
Other features include frame trapping and forwarding to the CPU, port
monitoring, and broadcast storm control to reduce broadcast traffic
through the switch. The BCM5631 also offers a flexible Multiplexer
mode in which the L2 switching functionality can be turned on and off.
Counters
VLAN
Table
MIB
Maintenance
Interface
L2 MAC
Table
Table
PCI
To CPU
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