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74741-0002 Folha de dados(PDF) 2 Page - Molex Electronics Ltd. |
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74741-0002 Folha de dados(HTML) 2 Page - Molex Electronics Ltd. |
2 / 4 page SFP 1000BASE-T RJ-45 FEATURES SFP Mode When the internal Gigabit Ethernet transceiver (PHY) is configured to SFP mode, the PHY interfaces directly with the host serial/deserial (SERDES) interface. The host interface transmits and receives serial data differentially at 1.25Gbps. The copper interface is full featured and advertises full/half duplex, and 1000Base-T wire speed. Auto-Negotiation The CAT-5 copper link negotiates according to the IEEE 802.3 Clause 28, and the SERDES interface negotiates using Clause 37. The two interfaces advertise 1000Base-T full-duplex, and master/slave relationships. The master establishes the time control from its local clock source. The slave however recovers the clock from the received data stream. The SFP application is limited to 1000Base-T wire speed only. Auto-Negotiation on the SERDES link is always restarted when a change is detected on copper link. The SFP 1000Base-T features a Serial Interface (SerDes) Auto-Negotiation Bypass mode. This mode disables auto-negotiation after 200ms of unsuccessful attempts with the host, without the need for manually configuring the auto-negotiation parameters. The Molex SFP 1000Base-T module will transmit data with auto-negotiation disabled. Automatic MDI Crossover The SFP 1000Base-T transceiver performs a MDI crossover during Auto-Negotiation eliminating the need for crossover cables or cross-wired (MDIX) ports. Automatic Polarity Correction Should the polarity of receive signals inadvertently become reversed, the SFP 1000Base-T will automatically correct them based on the sequence of idle signals received Auto Power Savings Mode When the copper link is lost, the SFP automatically enters a low power mode reducing the chip power requirements. Full power mode resumes once the copper link is re-established. Serial ID Serial identification is implemented on the SFP 1000Base-T transceiver. The serial protocol uses a two-wire I2C interface. Software Reconfigurable The SFP 1000Base-T is hardware configured on power- up. The configuration can be changed by a register write via a two-wire bus (I2C) at any time. For further detail, refer to the Molex SFP 1000Base-T software configuration application note. 1000Base-T RJ-45 Gigabit Ethernet SFP Copper Transceiver 74741 AUTO-NEGOTIATION SUMMARY Auto-Negotiation Features Implemented: General: ■ SERDES Auto-Negotiation is restarted when a change is detected on the copper link ■ Auto power savings mode when copper link is lost Copper RJ-45 Interface: ■ Auto-Negotiation ■ Copper SFP speed 1000Base-T ■ Full duplex ■ Automatic MDI Crossover ■ Master/slave relationships ■ Pause flow control ■ Software reconfigurable Host SERDES Interface: ■ Differential SERDES interface at 1.25Gpbs ■ Master/slave relationships ■ SERDES recovers the clock from the received data stream ■ Pause flow control |
Nº de peça semelhante - 74741-0002 |
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Descrição semelhante - 74741-0002 |
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