Supports five 10/100 Mbit/s Ethernet ports with RMII interface Capable

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Supports five 10/100 Mbit/s Ethernet ports with RMII interface Capable

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AL15 Advance Information Five-Port Cost 10/100 Switch With RMII
Supports five 10/100 Mbit/s Ethernet ports with RMII interface Capable trunking Mbit/s link Full- half-duplex mode operation Speed auto-negotiation through MDIO Built-in storage addresses expandable Design utilize low-cost SGRAM Serial EEPROM interface low-cost system configuration Automatic source address learning Secure mode traffic filtering Broadcast storm control Port monitoring support IEEE 802.3x flow control full-duplex operation Optional backpressure flow control support half-duplex operation Supports store-and-forward mode switching VLAN support 0.35 micron, 3.3V CMOS technology Packaged 208-pin PQFP
Product Description AL15 five-port 10/100 Mbit/s dual speed Ethernet switch. low-cost Fast Ethernet switch implemented using AL15 with low-cost SGRAM.
10/100
Switch Controller
Buffer Manager
10/100 Address Control Address Table Expansion Address Table EEPROM Interface
10/100
High Speed Switch Fabric
10/100
10/100
Figure
System Block Diagram
Reference Only Allayer Confidential
AL15 Advance Information
AL15 Overview
AL15 provides five 10/100 Mbit/s Ethernet ports. Each port supports both Mbit/s data rate. operation mode auto-negotiated PHY. ports full-duplex capable. device also supports VLAN workgroup segment switching applications. Data received from interface stored external memory buffer. AL15 utilizes cost effective SGRAM provide 8-Mbit 16-Mbit buffer memory. During transmission, data obtained from buffer memory routed destination port's output buffer. collision occurs during half-duplex operation, control will back retransmit accordance IEEE 802.3 specification. AL15 provides flow-control methods. half-duplex operations, optional jamming based flow-control (also known backpressure) available prevent loss data. With this method flow-control, switch will generate signal when receive buffer full sending station will start transmit until line clear. full-duplex mode, AL15 utilizes IEEE 802.3x flow-control mechanism. ports support multiple addresses. switch chip supports addresses internally expandable external SRAM used. These addresses shared among eight ports. initialization configuration switch programmed external EEPROM. Field reconfiguration achieved using parallel interface reprogram EEPROM. AL15 supports port based VLAN. VLAN register used configure destination ports multicast broadcast frames. AL15 operates only store forward mode. entire frame checked error frames with errors automatically filtered will forwarded destination port. device also provides levels security intrusion protection which implemented port basis. AL15 also features port monitoring broadcast storm throttling.
2/2000
Reference Only Allayer Confidential

Supports five 10/100 Mbit/s Ethernet ports with RMII interface Capable

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