Supports 2 Gigabit Ethernet ports			RoX expansion link supports 4.8 Gbit/s throughput
	Integrated MAC and PCS functions			Serial EEPROM interface for low cost system configuration
	Interface to industry standard SERDES			Automatic source address learning
	Full duplex mode operation			Secure mode traffic filtering
	Built-in storage of 2K MAC addresses, expandable to 32K			Broadcast storm control
	On-chip table supports 64 multicast group entries for IP multicast application			Port Monitoring support
	Designed to utilize low cost SGRAMs			IEEE802.3X flow control for full duplex operation
	Scalable design			Supports both Port based VLAN and 802.3AC VLAN
	Spanning Tree support			RMON and SNMP support with AL300
	Packaged in 420-pin BGA			0.35 micron, 3.3V CMOS technology

The AL1000 is a 2 port Gigabit Ethernet switch chip. It provides a high performance, low cost, and scalable solution for both standalone Gigabit Ethernet switching systems and hybrid Fast Ethernet/Gigabit Ethernet switching systems (using additional AL100 Fast Ethernet switching ICs). The device is part of the Allayer RoX switch chip set family. Its primary application will be as a gigabit uplink for Fast Ethernet switches, however, a low cost Gigabit Ethernet switch solution for up to 8 ports can also be implemented using just four AL1000 devices.

The RoX interface is a 2.4 Gigabit/second interface (4.8 Gbit/s full duplex). The interface can support up to four switching devices. Various configurations can be implemented using different combinations of the AL1000 and the other RoX family components (Fast Ethernet switches, reduced MII interface devices, management devices, etc.). The RoX bus allows the design engineer to implement a wide range of Ethernet port configurations, from an eight port Fast Ethernet switch (using the AL100), to a 24 100 Mbps port plus 2 Gigabit port switching system.

The AL1000 provides two Gigabit Ethernet ports. All ports are full duplex with data received from the MAC interface stored in an external memory buffer. The AL1000 uses cost effective SGRAMs to provide 16 Mbits of buffer memory. During transmission, the data is acquired from the buffer memory and routed directly to the destination port. Unlike other systems, there is no memory latency because there are no extra buffers on each port. Allayer's "shared memory" architecture can output data directly to the final output port without going through any intervening ports/memory buffers. The AL1000 supports the IEEE 802.3X flow control.

The RoX interface also supports an external management device, the AL300. SNMP and RMON are supported through this external management device. When the management option is enabled, network statistics for each port is gathered and send across the RoX bus. The AL300 on the bus will collect and store the data for the network management agent. Access to the statistics counters is provided via the CPU interface of the MIB device.

All ports support multiple MAC addresses. The switch chip supports up to 2K MAC addresses internally, expandable to 8K with external memory. These MAC addresses are shared between the two on-chip ports.

The initialization and configuration of the the switch is programmed by an external EEPROM. For an unmanaged switch design, there is no need for a CPU. Field reconfiguration can be performed using a parallel port interface to reprogram the EEPROM.

The device also supports port based and tagged VLAN (IEEE 802.3AC) for workgroup and segment switching applications.

Other features include port monitoring and broadcast storm throttling.