Datasheet

 2016 Microchip Technology Inc. DS00002165B-page 9
LAN8720A/LAN8720AI
Note 2-4 Configuration strap values are latched on power-on reset and system reset. Configuration straps are
identified by an underlined symbol name. Signals that function as configuration straps must be
augmented with an external resistor when connected to a load. Refer to Section 3.7, "Configuration
Straps," on page 29 for additional information.
TABLE 2-3: SERIAL MANAGEMENT INTERFACE (SMI) PINS
Num PINs NAME SYMBOL
BUFFER
TYPE
DESCRIPTION
1 SMI Data
I
nput/Output
MDIO VIS/
VOD8
Serial Management Interface data input/output
1 SMI Clock MDC VIS Serial Management Interface clock
1
LED 2 LED2 O12 Link Speed LED Indication. This pin is driven
active when the operating speed is 100Mbps. It is
inactive when the operating speed is 10Mbps or
during line isolation.
Note: Re
fer to Section 3.8.1, "LEDs," on
page 32 for additional LED information.
nINT/
REFCLKO
F
unction
Select
Configuration
Strap
nINTSEL IS
(PU)
This configuration strap selects the mode of the
nINT/REFCLKO pin.
• When
nINTSEL is floated or pulled to
VDD2A, nINT is selected for operation on the
nINT/REFCLKO pin (default).
• When
nINTSEL is pulled low to VSS, REF-
CLKO is selected for operation on the nINT/
REFCLKO pin.
See Note 2-4 for more information on configura-
tion straps.
Note: Re
fer to See Section 3.8.1.2, "nINTSEL
and LED2 Polarity Selection," on page 33
for additional information.
TABLE 2-4: ETHERNET PINS
Num PINs NAME SYMBOL
BUFFER
TYPE
DESCRIPTION
1 Ethernet TX/
RX Po
sitive
Channel 1
TXP AIO Transmit/Receive Positive Channel 1
1 Ethernet TX/
RX Neg
ative
Channel 1
TXN AIO Transmit/Receive Negative Channel 1
TABLE 2-2: LED PINS (CONTINUED)
NUM PINS NAME SYMBOL
BUFFER
TYPE DESCRIPTION