LAN8720AI-CP SMSC, LAN8720AI-CP Datasheet - Page 19

• Manufacturer Part Number: LAN8720AI-CP
• Description: TXRX ETHERNET 10/100 RMII 24QFN
• Manufacturer: SMSC
• Type: Transceiverr

Specifications of LAN8720AI-CP

• Number Of Drivers/receivers: 4/4
• Protocol: RMII
• Voltage - Supply: 1.6 V ~ 3.6 V
• Mounting Type: Surface Mount
• Package / Case: 24-QFN
• Product: Ethernet Transceivers
• Standard Supported: 802.3, 802.3u
• Supply Voltage (max): 3.6 V
• Supply Voltage (min): 1.6 V
• Maximum Operating Temperature: + 85 C
• Ethernet Connection Type: 10/100 Base-T
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 638-1084

Small Footprint RMII 10/100 Ethernet Transceiver with HP Auto-MDIX Support
Datasheet
SMSC LAN8720A/LAN8720Ai
3.1.1.3
3.1.1.4
3.1.1.5
3.1.1.6
GROUP
CODE
11001
00000
00001
00010
00011
00101
01000
01100
10000
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 125MHz 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”.
100M Transmit Driver
The MLT3 data is then passed to the analog transmitter, which drives the differential MLT-3 signal, on
outputs TXP and TXN, to the twisted pair media across a 1:1 ratio isolation transformer. The 10BASE-
T and 100BASE-TX signals pass through the same transformer so that common “magnetics” can be
used for both. The transmitter drives into the 100Ω impedance of the CAT-5 cable. Cable termination
and impedance matching require external components.
100M Phase Lock Loop (PLL)
The 100M PLL locks onto reference clock and generates the 125MHz clock used to drive the 125 MHz
logic and the 100BASE-TX transmitter.
SYM
V
V
V
V
V
V
V
V
V
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
19
INVALID
INVALID
INVALID
INVALID
INVALID
INVALID
INVALID
INVALID
INVALID
INTERPRETATION
TRANSMITTER
Revision 1.2 (11-10-10)