LAN88710BMR SMSC, LAN88710BMR Datasheet - Page 20

• Manufacturer Part Number: LAN88710BMR
• Description: Ethernet ICs MII/RMII 10/100 Automot Transceiver
• Manufacturer: SMSC

Specifications of LAN88710BMR

• Ethernet Connection Type: 10BASE-T, 100BASE-TX
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Product: Ethernet Transceivers
• Standard Supported: IEEE802.3, IEEE802.3u
• Supply Voltage (max): 3.6 V
• Supply Voltage (min): 1.6 V
• Maximum Operating Temperature: + 105 C
• Package / Case: QFN-32
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Revision 1.1 (05-26-10)
3.1.1.1
3.1.1.2
GROUP
CODE
01001
10100
10101
01010
01011
10010
10011
10110
11010
11000
11110
01110
01111
10111
11011
11100
11101
11111
100BASE-TX Transmit Data Across the MII/RMII Interface
For MII, 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 MII block on the rising edge of TXCLK. The data
is in the form of 4-bit wide 25 MHz data.
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 50 MHz data.
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
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.
SYM
C
D
0
1
2
3
4
5
6
7
8
9
A
B
E
F
J
I
IDLE
First nibble of SSD, translated to “0101”
following IDLE, else RXER
A
B
C
D
E
0
1
2
3
4
5
6
7
8
9
F
INTERPRETATION
Table 3.1 4B/5B Code Table
Small Footprint MII/RMII 10/100 Ethernet Transceiver for Automotive Applications
RECEIVER
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
A
B
C
D
E
0
1
2
3
4
5
6
7
8
9
F
SMSC LAN88710AM/LAN88710BM
INTERPRETATION
TRANSMITTER
Table
0000
0001
0010
0011
0100
0101
0110
1000
1001
1010
1011
1100
1101
0111
1110
1111
3.1. Each 4-bit data-
DATA
Datasheet