Datasheet

LAN8740A/LAN8740Ai
DS00001987A-page 18  2013-2015 Microchip Technology Inc.
TABLE 3-1: 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 TXEN
11000 J First nibble of SSD, translated to “0101”
following IDLE, else RXER
Sent for rising TXEN
10001 K Second nibble of SSD, translated to
“0101” following J, else RXER
Sent for rising TXEN
01101 T First nibble of ESD, causes de-assertion of
CRS if followed by /R/, else assertion of
RXER
Sent for falling TXEN
00111 R Second nibble of ESD, causes deasser-
tion 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 Indicates to receiver that the transmitter
will be going to LPI
Sent due to LPI. Used to tell receiver
before transmitter goes to LPI. Also used
for refresh cycles during LPI.
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