LAN8740A Datasheet, PDF (18/136 Pages) Microchip Technology – Small Footprint MII/RMII 10/100 Energy Efficient Ethernet Transceiver with HP Auto-MDIX and flexPWR® Technology

LAN8740A/LAN8740Ai
TABLE 3-1: 4B/5B CODE TABLE
Code Group
11110
01001
10100
10101
01010
01011
01110
01111
10010
10011
10110
10111
11010
11011
11100
11101
11111
11000
10001
01101
00111
00100
00110
11001
00000
00001
00010
00011
00101
01000
01100
10000
Sym
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
I
J
K
T
R
H
V
V
V
V
V
V
V
V
V
V
Receiver Interpretation
Transmitter Interpretation
0
0000
DATA
1
0001
2
0010
3
0011
4
0100
5
0101
6
0110
7
0111
8
1000
9
1001
A
1010
B
1011
C
1100
D
1101
E
1110
F
1111
IDLE
First nibble of SSD, translated to “0101”
following IDLE, else RXER
Second nibble of SSD, translated to
“0101” following J, else RXER
First nibble of ESD, causes de-assertion of
CRS if followed by /R/, else assertion of
RXER
Second nibble of ESD, causes deasser-
tion of CRS if following /T/, else assertion
of RXER
Transmit Error Symbol
INVALID, RXER if during RXDV
INVALID, RXER if during RXDV
Indicates to receiver that the transmitter
will be going to LPI
INVALID, RXER if during RXDV
INVALID, RXER if during RXDV
INVALID, RXER if during RXDV
INVALID, RXER if during RXDV
INVALID, RXER if during RXDV
INVALID, RXER if during RXDV
INVALID, RXER if during RXDV
0
0000
1
0001
2
0010
3
0011
4
0100
5
0101
6
0110
7
0111
8
1000
9
1001
A
1010
B
1011
C
1100
D
1101
E
1110
F
1111
Sent after /T/R until TXEN
Sent for rising TXEN
Sent for rising TXEN
Sent for falling TXEN
DATA
Sent for falling TXEN
Sent for rising TXER
INVALID
INVALID
Sent due to LPI. Used to tell receiver
before transmitter goes to LPI. Also used
for refresh cycles during LPI.
INVALID
INVALID
INVALID
INVALID
INVALID
INVALID
INVALID
DS00001987A-page 18
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