LAN9420I-NU Standard Microsystems (SMSC), LAN9420I-NU Datasheet - Page 18

• Manufacturer Part Number: LAN9420I-NU
• Manufacturer: Standard Microsystems (SMSC)

Specifications of LAN9420I-NU

• Operating Supply Voltage (typ): 3.3V
• Operating Supply Voltage (min): 3V
• Operating Supply Voltage (max): 3.6V
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 128
• Lead Free Status / RoHS Status: Compliant

Revision 1.4 (12-17-08)
NUM
PINS
NUM
PINS
1
1
1
1
nLED2 (Link &
nLED1 (Speed
nLED3 (Full-
Purpose I/O
Purpose I/O
Purpose I/O
AutoMDIX
Indicator)
Indicator)
Indicator)
General
General
General
Activity
Duplex
Enable
NAME
NAME
data 0
data 1
data 2
AUTOMDIX_EN
SYMBOL
SYMBOL
GPIO0
nLED1
GPIO1
nLED2
GPIO2
nLED3
Table 2.3 GPIO and LED Pins
Table 2.4 Configuration Pins
BUFFER
BUFFER
IS/O12/
IS/O12/
IS/O12/
Single-Chip Ethernet Controller with HP Auto-MDIX Support and PCI Interface
TYPE
OD12
OD12
OD12
OD12
OD12
OD12
TYPE
(PU)
DATASHEET
IS
18
General Purpose I/O data 0: This general-purpose pin is
fully programmable as either push-pull output, open-drain
output or input by writing the GPIO_CFG configuration
register in the SCSR. GPIO pins are Schmitt-triggered
inputs.
nLED1 (Speed Indicator): This pin can also function as
the Ethernet speed indicator LED and is driven low when
the operating speed is 100Mbs, during auto-negotiation,
and when the cable is disconnected. This pin is driven
high only during 10Mbs operation.
General Purpose I/O data 1: This general-purpose pin is
fully programmable as either push-pull output, open-drain
output or input by writing the GPIO_CFG configuration
register in the SCSR. GPIO pins are Schmitt-triggered
inputs.
nLED2 (Link & Activity Indicator): This pin can also
function as the Ethernet Link and Activity Indicator LED
and is driven low (LED on) when LAN9420/LAN9420i
detects a valid link. This pin is pulsed high (LED off) for
80mS whenever transmit or receive activity is detected.
This pin is then driven low again for a minimum of 80mS,
after which time it will repeat the process if TX or RX
activity is detected. Effectively, LED2 is activated solid for
a link. When transmit or receive activity is sensed, LED2
will flash as an activity indicator.
General Purpose I/O data 2: This general-purpose pin is
fully programmable as either push-pull output, open-drain
output or input by writing the GPIO_CFG configuration
register in the SCSR. GPIO pins are Schmitt-triggered
inputs.
nLED3 (Full-Duplex Indicator): This pin can also
function as the Ethernet Full-Duplex Indicator LED and is
driven low when the link is operating in full-duplex mode.
AutoMDIX Enable: Enables Auto-MDIX. Pull high or
leave unconnected to enable Auto-MDIX, pull low to
disable Auto-MDIX.
DESCRIPTION
DESCRIPTION
SMSC LAN9420/LAN9420i
Datasheet