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Details, datasheet, quote on part number:AL1022
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| Part: | AL1022 |
| Category: | Communication => Network => SONET/SDH/ATM/DS3/PHYs/E3 (T3/E3) |
| Description: | Dual-port Gigabit Ethernet Switch ic |
| Company: | Allayer Communications |
| Datasheet: | Download AL1022 datasheet File size : 23 kB |
| Request For quote: | Find where to buy AL1022
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Datasheet text preview:
A L1022 Advance Information Two-Port Gigabit Ethernet Switch
· · · · · · · · · · Supports two Gigabit Ethernet ports Integrated MAC and PCS functions Interface to industry standard SERDES and GMII Supports 802.1p with four priority queues Supports both port-based VLAN and 802.1q VLAN RMON and SNMP support with external (MIB) device Built-in 1K address table expandable up to 32K MAC addresses On-chip table supports 64 multicast group entries for IP multicast application IGMP frames trapping and filtering Designed to utilize low-cost SGRAM Product Description The AL1022 is a two-port Gigabit Ethernet switch chip. The device is a part of the Allayer RoX-II switch chip set family. It is intended as a gigabit uplink for Fast Ethernet switches. In addition, a low-cost Gigabit Ethernet switch solution up to eight-ports can be designed by using four AL1022s. · · · · · · · · · · · · Flexible prioritized queueing for multimedia and data traffic Layer 3/4 switching with AL3000 on RoX-II Full-duplex mode operation RoX-II expansion link supports 6.4 Gbit/s throughput Scalable design Supports port aggregation/trunking Secure mode traffic filtering Broadcast storm control Port monitoring support IEEE 802.3x flow control 0.25 micron, 2.5V CMOS technology Packaged in 456-pin BGA
Switch Controller
Buffer Manager
PCS/PMA
Gigabit MAC Address Control
Expansion Buffer High Speed Switch Fabric
EEPROM Interface Address Table PCS/PMA Gigabit MAC
Management Information
Figure 1
System Block Diagram
Reference Only / Allayer Confidential
AL1022 Advance Information
AL1022 Overview
The RoX-II provides a 6.4 Gbit/s interface which can support up to four switch chips. Various system configurations can be achieved using the RoX-II family of components. The RoX-II bus enables the design engineer to implement a wide range of Fast Ethernet and Gigabit Ethernet switch configurations, ranging from an eight-port Gigabit Ethernet switch (using the AL1022) to a 24-port 100 Mbit/s switch with two-Gigabit Ethernet ports (using the AL126 and the AL1022). The AL1022 supports two full-duplex Gigabit Ethernet ports. Data received from the MAC interface is stored in the external memory buffer. During transmission, the data is obtained from the buffer memory and routed to the destination port. The AL1022 utilizes cost effective SGRAM to provide up to 16 Mbit of buffer memory. The RoX-II interface also supports an external management device, the AL300A. SNMP and RMON are supported through this external management device. When the management option is enabled, network statistics for each port is gathered and sent across the RoX-II bus. The AL300A on the bus will collect and store the data for the network management agent. Access to the statistic counters is provided via the CPU interface of the MIB device. The RoX-II interface also supports Layer 3 and Layer 4 external switching provided by the AL3000 device. All ports support multiple MAC addresses. The switch-chip supports 1K MAC internal addresses that are expandable to 32K with external memory. MAC addresses are shared among the two ports. The device also provides 64 IP multicast group addresses for IP multicast applications. The AL1022 can perform IGMP, ARP, and GARP frame trapping, and forward them to the CPU. The CPU thus can participate in these protocols and determine which ports should participate in the multicast session. The switch is initialized and configured by an external EEPROM. For an unmanaged switch design, there is no need for a CPU. A parallel interface can be utilized to reprogram the EEPROM for field reconfiguration. The device also supports port-based and tagged VLAN (IEEE 802.3ac/802.1q VLAN) for workgroup and segment switching applications. The AL1022 supports the IEEE 802.3x flow control protocol. Other features include port monitoring broadcast storm filtering to reduce broadcast traffic through the switch.
2/2000
Reference Only / Allayer Confidential
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