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9880 Datasheet(PDF) 32 Page - Intel Corporation |
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9880 Datasheet(HTML) 32 Page - Intel Corporation |
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32 / 118 page  LXT9860/9880 — Advanced 10/100 Repeater with Integrated Management 32 Datasheet Document #: 248987 Revision#: 003 Rev Date: 08/07/01 3.2 Port Configuration The LXT98x0 powers up in auto-negotiation mode for all twisted-pair ports. Software can monitor or change the configuration through the PHY Port Control Register. 3.2.1 Auto-Negotiation All TP ports on power up are configured to establish its link via auto-negotiation. The port and its link partner establish link conditions by exchanging Fast Link Pulse (FLP) bursts. Each FLP burst contains 16 bits of data advertising the port’s capabilities. The FLP bursts sent by the port are maintained in its auto-negotiation advertisement register (Table 71 on page 107). The link partner’s abilities are stored in the auto-negotiation link partner register (Table 66 on page 104). Status can be observed in the respective auto-negotiation status register (Table 65 on page 104). Each port has its own advertisement, link partner advertisement, auto-negotiation expansion, auto-negotiation status registers, and control register. The advertisement register is read-only, except for bits 5, 7, and 13. The LXT98x0 can advertise 100 Mbps half-duplex and/or 10 Mbps half-duplex; it never advertises full duplex. If the link partner does not support auto-negotiation, the LXT98x0 determines link state by listening for 100 Mbps IDLE symbols or 10 Mbps link pulses. If it detects either of these signals, it configures the port and updates the status registers appropriately. Figure 3. Typical LXT988x Managed Repeater Architectures LXT9880 IC Device Management 10BASE-T Repeater 100BASE- X Repeater LED Drivers RMON & SNMP Counters 10 Mbps Backplane 100 Mbps Backplane Serial Port 10/100 PHY 10/100 PHY MII MII 10/100 PHY 10/100 PHY 10/100 PHY 10/100 PHY 10/100 PHY 10/100 PHY LXT9880 IC Device Management 10BASE-T Repeater 100BASE- X Repeater LED Drivers RMON & SNMP Counters 10 Mbps Backplane 100 Mbps Backplane Serial Port 10/100 PHY 10/100 PHY MII MII 10/100 PHY 10/100 PHY 10/100 PHY 10/100 PHY 10/100 PHY 10/100 PHY LXT9880 IC Device Management 10BASE-T Repeater 100BASE-X Repeater LED Drivers RMON & SNMP Counters 10Mbps Backplane 100Mbps Backplane Serial Port 10/100 PHY 10/100 PHY MII MII 10/100 PHY 10/100 PHY 10/100 PHY 10/100 PHY 10/100 PHY 10/100 PHY Serial Management to SCC Buffer 100M Backplane Buffer 10M Backplane MII to MII Bridge |
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