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LAN8720AI Datasheet(PDF) 18 Page - SMSC Corporation

Part # LAN8720AI
Description  Small Footprint RMII 10/100 Ethernet Transceiver with HP Auto-MDIX Support
PDF  79 Pages
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Manufacturer  SMSC [SMSC Corporation]
Direct Link  http://www.smsc.com
Logo SMSC - SMSC Corporation

LAN8720AI Datasheet(HTML) 18 Page - SMSC Corporation

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Small Footprint RMII 10/100 Ethernet Transceiver with HP Auto-MDIX Support
Datasheet
Revision 1.4 (08-23-12)
18
SMSC LAN8720A/LAN8720Ai
DATASHEET
3.1.1.2
4B/5B Encoding
The transmit data passes from the RMII block to the 4B/5B encoder. This block encodes the data from
4-bit nibbles to 5-bit symbols (known as “code-groups”) according to Table 3.1. Each 4-bit data-nibble
is mapped to 16 of the 32 possible code-groups. The remaining 16 code-groups are either used for
control information or are not valid.
The first 16 code-groups are referred to by the hexadecimal values of their corresponding data nibbles,
0 through F. The remaining code-groups are given letter designations with slashes on either side. For
example, an IDLE code-group is /I/, a transmit error code-group is /H/, etc.
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
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



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