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LAN8710A-EZC 데이터시트(PDF) 29 Page - SMSC Corporation |
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LAN8710A-EZC 데이터시트(HTML) 29 Page - SMSC Corporation |
29 / 82 page Small Footprint MII/RMII 10/100 Ethernet Transceiver with HP Auto-MDIX and flexPWR® Technology Datasheet SMSC LAN8710A/LAN8710Ai 29 Revision 1.4 (08-23-12) DATASHEET 3.3 HP Auto-MDIX Support HP Auto-MDIX facilitates the use of CAT-3 (10BASE-T) or CAT-5 (100BASE-T) 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. 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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