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Part: AL101
Category:
Communication
-> Network
-> Ethernet/DS1/E1 (T1/E1)
-> Fast Ethernet
Description: 8-port Rox Switch ic
Company: Allayer Communications
Datasheet: Download AL101 datasheet File size : 1040 kB
Request For quote: Find where to buy AL101
Datasheet text preview:
AL101 Advance Information 8 Port 10/100 Mbit/s Dual Speed Fast Ethernet Switch
· · · · · · · · · · Supports eight 10/100 Mbit/s Ethernet ports with RMII interface Capable of trunking for up to 800 Mbit/s link Full- and half-duplex mode operation Speed auto-negotiation through MDIO Built-in storage of 1K MAC addresses Designed to utilize low cost SGRAM Scalable design for stackable switch implementation RoX expansion link supports 4.8 Gbit/s throughput Serial EEPROM interface for low-cost system configuration Gigabit Ethernet ready Product Description The AL101 is an eight-port 10/100 Mbit/s dual speed Ethernet switch. A low-cost and scalable solution for up to 32 ports is achieved through the use of low-cost buffer memory and Allayer's proprietary RoX architecture. In addition, the AL101 supports VLAN and multiple link aggregation trunks.
10/100 MAC
· · · · · · · · · · ·
Automatic source address learning Secure mode traffic filtering Broadcast storm control Port monitoring support IEEE 802.3x flow control for full-duplex operation Optional backpressure flow control support for half-duplex operation Supports store-and-forward mode switching VLAN support RMON and SNMP support with external management (MIB) device 0.35 micron, 3.3V CMOS technology Packaged in 256-pin PQFP
Switch Controller
Buffer Manager
10/100 MAC Expansion Interface
10/100 MAC High Speed Switch Fabric
Address Control
10/100 MAC
10/100 MAC
Address Table
Address Table Expansion
10/100 MAC EEPROM Interface Management Information 10/100 MAC
10/100 MAC
Figure 1
System Block Diagram
Reference Only / Allayer Confidential
AL101 Advance Information
AL101 Overview
The RoX interface is a 2.4 Gbit/s interface (4.8 Gbit/s full-duplex). The interface can support up to four switch chips. Various combinations can be used for different configurations. The maximum port configuration will be either 32-port 100 Mbit/s ports or 24-port 100 Mbit/s plus two Gigabit Ethernet ports. The RoX interface also supports an external management device, the AL300A. SNMP and RMON are supported through this external management device. The AL101 provides eight 10/100 Mbit/s Ethernet ports. Each port supports both 10 and 100 Mbit/s data rate. The operation mode is auto-negotiated by the PHY. All ports are full-duplex capable. The device also supports VLAN for workgroup and segment switching application. The AL101 also supports trunking applications. The chip provides two optional load balancing schemes, explicit and dynamic. With trunking, it is possible to group up to four full-duplex links together to form a single 800 Mbit/s link. Data received from the MAC interface is stored in the external memory buffer. The AL101 utilizes cost effective SGRAM to provide 8-Mbit or 16-Mbit of buffer memory. During transmission, the data is obtained from the buffer memory and routed to the destination port. In the event of a collision during a half-duplex operation, the MAC control will back off and retransmit in accordance to the IEEE 802.3 specification. The AL101 provides two flow control methods. For half-duplex operations, an optional jamming based flow control (known as backpressure) is available to prevent loss of data. With this method of flow control, the switch will generate a jam signal when the receive-buffer is full. The sending station will not transmit until the line is clear. In the full-duplex mode, the AL101 utilizes IEEE 802.3x as the flow control mechanism. All ports support multiple MAC addresses. The switch chip supports up to 1K MAC addresses internally. These MAC addresses are shared among all eight ports. The initialization and configuration of the switch is programmed by an external EEPROM. For an unmanaged switch design, there is no need for a CPU. Field reconfiguration can be achieved by using a parallel interface to reprogram the EEPROM. For managed switch applications, the AL101 supports network management through the network management option. When the management option is enabled, network statistics for each port are gathered and sent across the RoX bus. The management information base chip on the bus will collect and store the data for the network management agent. Access to the statistical counters is provided via the CPU interface of the MIB device. The AL101 also supports port-based VLAN. The VLAN register set is used to configure the destination ports for multicast and broadcast frames. The device also provides two levels of security for intrusion protection. Security can be implemented on a per port basis. The AL101 operates only in the store and forward mode. The entire frame is checked for errors and any frames with errors are automatically filtered and will not be forwarded to the destination port. Other features include port monitoring and broadcast storm throttling.
2/2000
Reference Only / Allayer Confidential
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