12 GIGABIT PORT SWITCHING PROCESSOR

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 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. By Broadcom Corp.
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BCM5631 Application circuits
BCM5631 circuits
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