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LAN8742Ai-CZ Datasheet(PDF) 24 Page - Microchip Technology |
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LAN8742Ai-CZ Datasheet(HTML) 24 Page - Microchip Technology |
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24 / 124 page  LAN8742A/LAN8742Ai DS00001989A-page 24 2013-2015 Microchip Technology Inc. 3.3 HP Auto-MDIX Support HP Auto-MDIX facilitates the use of CAT-3 (10BASE-T) or CAT-5 (100BASE-TX) media UTP interconnect cable without consideration of interface wiring scheme. If a user plugs in either a direct connect LAN cable, or a cross-over patch cable, as shown in Figure 3-4, the device’s Auto-MDIX transceiver is capable of configuring the TXP/TXN and RXP/RXN pins for correct transceiver operation. The internal logic of the device detects the TX and RX pins of the connecting device. Since the RX and TX line pairs are interchangeable, special PCB design considerations are needed to accommodate the symmetrical magnetics and termination of an Auto-MDIX design. The Auto-MDIX function can be disabled via the AMDIXCTRL bit in the Special Control/Status Indications Register. Note: When operating in 10BASE-T or 100BASE-TX manual modes, the Auto-MDIX crossover time can be extended via the Extend Manual 10/100 Auto-MDIX Crossover Time bit of the EDPD NLP/Crossover Tim- eRegister. Refer to Section 4.2.12, "EDPD NLP/Crossover TimeRegister" for additional information. FIGURE 3-4: DIRECT CABLE CONNECTION VS. CROSS-OVER CABLE CONNECTION 1 2 3 4 5 6 7 8 TXP TXN RXP Not Used Not Used RXN Not Used Not Used 1 2 3 4 5 6 7 8 TXP TXN RXP Not Used Not Used RXN Not Used Not Used Direct Connect Cable RJ-45 8-pin straight-through for 10BASE-T/100BASE-TX signaling 1 2 3 4 5 6 7 8 TXP TXN RXP Not Used Not Used RXN Not Used Not Used 1 2 3 4 5 6 7 8 TXP TXN RXP Not Used Not Used RXN Not Used Not Used Cross-Over Cable RJ-45 8-pin cross-over for 10BASE-T/100BASE-TX signaling |
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