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Part: AL102
Category:
Description: 8-port Standalone Switch ic
Company: Allayer Communications
Datasheet: Download AL102 datasheet File size : 1040 kB
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Datasheet text preview:
A L102A Revision 1.0 8 PORT LOW COST 10/100 SWITCH
· · · · · · · · · Supports eight 10/100 Mbit/s Ethernet ports with MII interface Capable of trunking 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 Serial EEPROM interface for low-cost system configuration 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 3.3V operation Packaged in 256-pin PQFP
Product Description The AL102A is an eight-port 10/100 Mbit/s dual speed Ethernet switch. A low-cost Fast Ethernet switch can be implemented using the AL102A with low-cost SGRAM. The AL102A also supports VLAN and multiple port aggregation trunks.
10/100 MAC
Switch Controller
Buffer Manager
10/100 MAC
10/100 MAC High Speed Switch Fabric
Address Control
10/100 MAC
10/100 MAC
Address Table
10/100 MAC EEPROM Interface
10/100 MAC
10/100 MAC
Figure 1
System Block Diagram
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AL102A Revision 1.0
This document contains proprietary information which shall not be reproduced, transferred to other documents, or used for any other purpose without the prior written consent of Allayer Communications.
Disclaimer Allayer Communications reserves the right to make changes, without notice, in the product(s) described or information contained herein in order to improve the design and/or performance. Allayer Communications assumes no responsibility or liability for the use of any of these products, conveys no license or title under any patent or copyright to these products, and makes no representations or warranties that these products are free from patent or copyright infringement unless otherwise specified.
Life Support Applications Allayer Communications products are not designed for use in life support appliances, systems, or devices where malfunctions can be reasonably expected to result in personal injury.
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Table of Contents
1. 2. 3. AL102A Overview......... 5 Pin Descriptions............. 7 Functional Description.......... 16 3.1 Data Reception..... 16 3.1.1 3.1.2 3.1.3 3.1.4 3.2 3.2.1 3.2.2 3.2.3 3.3 3.4 3.5 3.6 3.7 Illegal Frame Length ...... 16 Long Frames ......... 16 False Carrier Events ....... 16 Frame Filtering...... 16 Broadcast Storm Control...... 17 Frame Transmission ....... 18 Frame Generation.. 18
Frame Forwarding......... 17
Half Duplex Mode Operation ...... 18 Secure Mode Operation ......... 18 Address Learning .......... 19 3.5.1 Address Aging....... 19 VLAN Support..... 19 Trunking (Port Aggregation)........ 21 3.7.1 3.7.2 3.7.3 Load Balancing ..... 21 Trunk Port Assignment ........ 22 Port Based Trunk Load Balancing ......... 22 Half Duplex Flow Control (Backpressure) ........... 24 Full Duplex Flow Control (802.3x) ....... 24
3.8
Flow Control ........ 24 3.8.1 3.8.2
3.9 3.10 3.11 3.12 3.13
Queue Management ...... 25 Uplink Port........... 25 Port Monitoring.... 26 Media Independent Interface (MII) ...... 26 PHY Management......... 26 PHY Management MDIO .... 27 PHY Management Master Mode .. 27 PHY Management Slave Mode..... 27
3.13.1 3.13.2 3.13.3
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AL102A Revision 1.0
3.13.4 3.13.5 3.14 3.14.1 3.14.2 3.14.3 3.14.4 3.14.5 3.14.6 3.15 4. 5. 6. 7. 8. 9. 10.
Non Auto-negotiation Mode ......... 27 Other PHY Options........ 28 System Initialization ...... 28 Start and Stop Bit .. 29 Write Cycle Timing........ 29 Read Cycle Timing ........ 30 Reprogramming the EEPROM Configuration ...... 30 EEPROM Map ...... 31
EEPROM Interface ....... 28
SGRAM Interface ......... 35
Register Descriptions............ 36 Timing Requirements............ 49 Electrical Specifications ....... 57 AL102A Mechanical Data .... 58 Appendix I (VLAN Mapping Work Sheet) .. 59 Appendix II (Port to Trunk Port Assignment Work Sheet) .. 60 Appendix III (Suggested Memory Components)......... 61
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AL102A Revision 1.0
1. AL102A Overview
The AL102A 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 applications. The AL102A also supports trunking applications. The chip provides two optional load balancing schemes, explicit and dynamic. With trunking, one can 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 AL102A 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. For half-duplex operations, in the event of a collision, the MAC control will back off and retransmit in accordance to the IEEE 802.3 specification. The AL102A provides two flow control methods. For half-duplex operations, an optional jamming based flow control (also 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 AL102A 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, a CPU is not required. Field reconfiguration can be achieved by using a parallel interface to reprogram the EEPROM. The AL102A 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 AL102A operates only in the store and forward mode. The entire frame is checked for error. Frames with errors are automatically filtered and will not be forwarded to the destination port. Other features include port monitoring and broadcast storm throttling.
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