LAN8700 Ver la hoja de datos (PDF) - SMSC -> Microchip
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LAN8700 Datasheet PDF : 73 Pages
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±15kV ESD Protected MII/RMII Fast-Ethernet PHY with HP Auto-MDIX and SMSC flexPWRTM in a Small Footprint
Datasheet
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.
The encoding process may be bypassed by clearing bit 6 of register 31. When the encoding is
bypassed the 5th transmit data bit is equivalent to TX_ER.
Note that encoding can be bypassed only when the MAC interface is configured to operate in MII
mode.
Table 4.1 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
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
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 RX_ER
Second nibble of SSD, translated to
“0101” following J, else RX_ER
First nibble of ESD, causes de-assertion
of CRS if followed by /R/, else assertion
of RX_ER
Second nibble of ESD, causes
deassertion of CRS if following /T/, else
assertion of RX_ER
Transmit Error Symbol
INVALID, RX_ER if during RX_DV
INVALID, RX_ER if during RX_DV
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 TX_EN
Sent for rising TX_EN
Sent for rising TX_EN
Sent for falling TX_EN
Sent for falling TX_EN
Sent for rising TX_ER
INVALID
INVALID
DATA
SMSC LAN8700/LAN8700I
19
DATASHEET
Revision 1.0 (02-09-07)
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