LAN8710AI datasheet(20/82 Pages) MICROCHIP

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Small Footprint MII/RMII 10/100 Ethernet Transceiver with HP Auto-MDIX and flexPWR® Technology

Datasheet

Revision 1.4 (08-23-12)

SMSC LAN8710A/LAN8710Ai

DATASHEET

For RMII, the MAC controller drives the transmit data onto the TXD bus and asserts TXEN to indicate

valid data. The data is latched by the transceiver’s RMII block on the rising edge of REF_CLK. The

data is in the form of 2-bit wide 50MHz data.

3.1.1.2

4B/5B Encoding

The transmit data passes from the MII/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

0000

DATA

0000

DATA

01001

0001

10100

0010

10101

0011

01010

0100

01011

0101

01110

0110

01111

0111

10010

1000

10011

1001

10110

1010

10111

1011

11010

1100

11011

1101

11100

1110

11101

1111

11111

IDLE

Sent after /T/R until TXEN

11000

First nibble of SSD, translated to “0101”

following IDLE, else RXER

Sent for rising TXEN

10001

Second nibble of SSD, translated to

“0101” following J, else RXER

Sent for rising TXEN

01101

First nibble of ESD, causes de-assertion

of CRS if followed by /R/, else assertion

of RXER

Sent for falling TXEN

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