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LAN8700 Datasheet(PDF) 15 Page - Microchip Technology |
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LAN8700 Datasheet(HTML) 15 Page - Microchip Technology |
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15 / 74 page  2007-2016 Microchip Technology Inc. DS00002260A-page 15 LAN8700/LAN8700i 4.2.3 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 PHY address, PHYAD[4:0], ensuring that in multiple-PHY applications, such as repeaters or switches, each PHY will have its own scrambler sequence. The scrambler also performs the Parallel In Serial Out conversion (PISO) of the data. TABLE 4-1: 4B/5B CODE TABLE Code Group SYM Receiver Interpretation Transmitter Interpretation 11110 0 0 0000 DATA 0 0000 DATA 01001 1 1 0001 1 0001 10100 2 2 0010 2 0010 10101 3 3 0011 3 0011 01010 4 4 0100 4 0100 01011 5 5 0101 5 0101 01110 6 6 0110 6 0110 01111 7 7 0111 7 0111 10010 8 8 1000 8 1000 10011 9 9 1001 9 1001 10110 A A 1010 A 1010 10111 B B 1011 B 1011 11010 C C 1100 C 1100 11011 D D 1101 D 1101 11100 E E 1110 E 1110 11101 F F 1111 F 1111 11111 I IDLE Sent after /T/R until TX_EN 11000 J First nibble of SSD, translated to “0101” following IDLE, else RX_ER Sent for rising TX_EN 10001 K Second nibble of SSD, translated to “0101” following J, else RX_ER Sent for rising TX_EN 01101 T First nibble of ESD, causes de-assertion of CRS if followed by /R/, else assertion of RX_ER Sent for falling TX_EN 00111 R Second nibble of ESD, causes deassertion of CRS if following /T/, else assertion of RX_ER Sent for falling TX_EN 00100 H Transmit Error Symbol Sent for rising TX_ER 00110 V INVALID, RX_ER if during RX_DV INVALID 11001 V INVALID, RX_ER if during RX_DV INVALID 00000 V INVALID, RX_ER if during RX_DV INVALID 00001 V INVALID, RX_ER if during RX_DV INVALID 00010 V INVALID, RX_ER if during RX_DV INVALID 00011 V INVALID, RX_ER if during RX_DV INVALID 00101 V INVALID, RX_ER if during RX_DV INVALID 01000 V INVALID, RX_ER if during RX_DV INVALID 01100 V INVALID, RX_ER if during RX_DV INVALID 10000 V INVALID, RX_ER if during RX_DV INVALID |
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