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LXT974 数据表(PDF) 20 Page - Intel Corporation |
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LXT974 数据表(HTML) 20 Page - Intel Corporation |
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20 / 74 page  LXT974/LXT975 — Fast Ethernet 10/100 Quad Transceivers 20 Datasheet 2.2 Network Media / Protocol Support The LXT974/975 supports both 10BASE-T and 100BASE-TX Ethernet over twisted-pair, or 100 Mbps Ethernet over fiber media (100BASE-FX). A Media Independent Interface (MII) is used for communication with the Media Access Controller (MAC). 2.2.1 10/100 Mbps Network Interface Each of the four network interface ports consists of four external pins (two differential signal pairs). The pins are shared between twisted-pair (TP) and fiber. Signal assignments (input or output, positive or negative) vary depending on whether the port is configured for TP or fiber media. Refer to Table 1 through Table 6 for specific pin assignments. The LXT974/975 output drivers generate either 100BASE-TX, 10BASE-T, or 100BASE-FX output. When not transmitting data, the LXT974/975 generates 802.3-compliant link pulses or idle code. Input signals are decoded either as a 100BASE-TX, 100BASE-FX, or 10BASE-T input, depending on the mode selected. Auto-negotiation/parallel detection or manual control is used to determine the speed of this interface. 2.2.1.1 Twisted-Pair Interface When operating at 100 Mbps, MLT3 symbols are continuously transmitted and received. When not transmitting data, the LXT974/975 generates “IDLE” symbols. During 10 Mbps operation, Manchester-encoded data is exchanged. When no data is being exchanged, the line is left in an idle state. In 100 Mbps mode, the LXT974/975 is capable of driving a 100BASE-TX connection over 100 Ω, Category 5, Unshielded Twisted Pair (UTP). A 10BASE-T connection can be supported using 100 Ω Category 3, UTP. Figure 5. LXT975 Switch Application Stacked RJ-45 10 or 100 Mbps LXT975 10/100 Quad Transceiver QUAD Transformer Fiber Module Backplane Memory Fiber Module Fiber Module Fiber Module LXT974 10/100 Quad Transceiver Switch MAC ASIC LXT975 10/100 Quad Transceiver LXT975 10/100 Quad Transceiver LXT975 10/100 Quad Transceiver QUAD Transformer QUAD Transformer QUAD Transformer |
类似零件编号 - LXT974 |
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类似说明 - LXT974 |
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