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LAN8710AI 数据表(PDF) 21 Page - Microchip Technology |
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LAN8710AI 数据表(HTML) 21 Page - Microchip Technology |
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21 / 82 page  Small Footprint MII/RMII 10/100 Ethernet Transceiver with HP Auto-MDIX and flexPWR® Technology Datasheet SMSC LAN8710A/LAN8710Ai 21 Revision 1.4 (08-23-12) DATASHEET 3.1.1.3 Scrambling Repeated data patterns (especially the IDLE code-group) can have power spectral densities with large narrow-band peaks. Scrambling the data helps eliminate these peaks and spread the signal power more uniformly over the entire channel bandwidth. This uniform spectral density is required by FCC regulations to prevent excessive EMI from being radiated by the physical wiring. The seed for the scrambler is generated from the transceiver address, PHYAD, ensuring that in multiple-transceiver applications, such as repeaters or switches, each transceiver will have its own scrambler sequence. The scrambler also performs the Parallel In Serial Out conversion (PISO) of the data. 3.1.1.4 NRZI and MLT-3 Encoding The scrambler block passes the 5-bit wide parallel data to the NRZI converter where it becomes a serial 125MHz NRZI data stream. The NRZI is encoded to MLT-3. MLT-3 is a tri-level code where a change in the logic level represents a code bit “1” and the logic output remaining at the same level represents a code bit “0”. 3.1.1.5 100M Transmit Driver The MLT3 data is then passed to the analog transmitter, which drives the differential MLT-3 signal, on outputs TXP and TXN, to the twisted pair media across a 1:1 ratio isolation transformer. The 10BASE- T and 100BASE-TX signals pass through the same transformer so that common “magnetics” can be used for both. The transmitter drives into the 100 Ω impedance of the CAT-5 cable. Cable termination and impedance matching require external components. 00111 R Second nibble of ESD, causes deassertion of CRS if following /T/, else assertion of RXER Sent for falling TXEN 00100 H Transmit Error Symbol Sent for rising TXER 00110 V INVALID, RXER if during RXDV INVALID 11001 V INVALID, RXER if during RXDV INVALID 00000 V INVALID, RXER if during RXDV INVALID 00001 V INVALID, RXER if during RXDV INVALID 00010 V INVALID, RXER if during RXDV INVALID 00011 V INVALID, RXER if during RXDV INVALID 00101 V INVALID, RXER if during RXDV INVALID 01000 V INVALID, RXER if during RXDV INVALID 01100 V INVALID, RXER if during RXDV INVALID 10000 V INVALID, RXER if during RXDV INVALID Table 3.1 4B/5B Code Table (continued) CODE GROUP SYM RECEIVER INTERPRETATION TRANSMITTER INTERPRETATION |
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