LAN88710AM SMSC, LAN88710AM Datasheet - Page 21

• Manufacturer Part Number: LAN88710AM
• Description: Ethernet ICs MII/RMII 10/100 Automot Transceiver
• Manufacturer: SMSC

Specifications of LAN88710AM

• 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: + 85 C
• Package / Case: QFN-32
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Small Footprint MII/RMII 10/100 Ethernet Transceiver for Automotive Applications
Datasheet
SMSC LAN88710AM/LAN88710BM
3.1.1.3
3.1.1.4
GROUP
CODE
10001
01101
00100
00110
11001
00000
00001
00010
00011
00101
01000
01100
10000
00111
Scrambling
Repeated data patterns (especially the IDLE code-group) can have power spectral densities with large
narrow-band peaks. Scrambling the data helps eliminate these peaks and spread the signal power
more uniformly over the entire channel bandwidth. This uniform spectral density is required by FCC
regulations to prevent excessive EMI from being radiated by the physical wiring.
The seed for the scrambler is generated from the transceiver address, PHYAD, ensuring that in
multiple-transceiver applications, such as repeaters or switches, each transceiver will have its own
scrambler sequence.
The scrambler also performs the Parallel In Serial Out conversion (PISO) of the data.
NRZI and MLT-3 Encoding
The scrambler block passes the 5-bit wide parallel data to the NRZI converter where it becomes a
serial 125 MHz NRZI data stream. The NRZI is encoded to MLT-3. MLT-3 is a tri-level code where a
change in the logic level represents a code bit “1” and the logic output remaining at the same level
represents a code bit “0”.
SYM
R
H
K
T
V
V
V
V
V
V
V
V
V
V
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
Second nibble of ESD, causes
deassertion of CRS if following /T/, else
assertion of RXER
Transmit Error Symbol
INVALID, RXER if during RXDV
INVALID, RXER if during RXDV
INVALID, RXER if during RXDV
INVALID, RXER if during RXDV
INVALID, RXER if during RXDV
INVALID, RXER if during RXDV
INVALID, RXER if during RXDV
INVALID, RXER if during RXDV
INVALID, RXER if during RXDV
INVALID, RXER if during RXDV
Table 3.1 4B/5B Code Table (continued)
INTERPRETATION
RECEIVER
DATASHEET
21
Sent for rising TXEN
Sent for falling TXEN
Sent for falling TXEN
Sent for rising TXER
INVALID
INVALID
INVALID
INVALID
INVALID
INVALID
INVALID
INVALID
INVALID
INVALID
INTERPRETATION
TRANSMITTER
Revision 1.1 (05-26-10)