LAN8710A-EZK SMSC, LAN8710A-EZK Datasheet - Page 20

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LAN8710A-EZK

Manufacturer Part Number
LAN8710A-EZK
Description
TXRX ETHERNET 10/100 MII/RMII
Manufacturer
SMSC
Type
Transceiverr
Datasheet

Specifications of LAN8710A-EZK

Number Of Drivers/receivers
4/4
Protocol
MII, RMII
Voltage - Supply
1.6 V ~ 3.6 V
Mounting Type
Surface Mount
Package / Case
32-QFN
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
638-1079
LAN8710A-EZK

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Revision 1.0 (04-15-09)
4.2.2
GROUP
CODE
01001
10100
10101
01010
01011
10010
10011
10110
11010
11000
10001
01101
01110
10111
11011
11100
11101
11110
01111
11111
4B/5B Encoding
The transmit data passes from the MII 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
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.
The encoding process may be bypassed by clearing bit 6 of register 31. When the encoding is
bypassed the 5
Note that encoding can be bypassed only when the MAC interface is configured to operate in MII
mode.
SYM
A
B
C
D
E
0
1
2
3
4
5
6
7
8
9
F
K
T
J
I
th
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
transmit data bit is equivalent to TXER.
A
B
C
D
E
0
1
2
3
4
5
6
7
8
9
F
INTERPRETATION
Table 4.1 4B/5B Code Table
RECEIVER
MII/RMII 10/100 Ethernet Transceiver with HP Auto-MDIX and flexPWR
0000
0001
0010
0011
0100
0101
0110
1000
1001
1010
1011
1100
1101
0111
1110
1111
DATASHEET
20
DATA
Sent after /T/R until TXEN
Sent for rising TXEN
Sent for rising TXEN
Sent for falling TXEN
A
B
C
D
E
0
1
2
3
4
5
6
7
8
9
F
Table
INTERPRETATION
TRANSMITTER
4.1. Each 4-bit data-nibble
0000
0001
0010
0100
0101
1000
1001
1010
0011
0110
0111
1011
1100
1101
1110
1111
SMSC LAN8710/LAN8710i
®
Technology in a Small Footprint
DATA
Datasheet

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