SMSC LAN9311 User Manual

Two Port 10/100 Managed Ethernet Switch with 16-Bit Non-PCI CPU Interface

Revision 1.4 (08-19-08)

28

SMSC LAN9311/LAN9311i

 

This section contains the descriptions of the LAN9311/LAN9311i pins. The pin descriptions have been
broken into functional groups as follows:

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Note: A list of buffer type definitions is provided in 

.

89-92

Port 1 LED 

Indicators

nP1LED[3:0]

OD12

LED Indicators: When configured as LED outputs 
via the 

, 

these pins are open-drain, active low outputs and 
the pull-ups and input buffers are disabled. The 
functionality of each pin is determined via the 
LED_CFG[9:8] bits.

General 

Purpose I/O 

Data

GPIO[3:0]

IS/O12/

OD12

(PU)

General Purpose I/O Data: When configured as 
GPIO via the 

, these general purpose signals are 

fully programmable as either push-pull outputs, 
open-drain outputs or Schmitt-triggered inputs by 
writing the 

 and 

. The 

pull-ups are enabled in GPIO mode. The input 
buffers are disabled when set as an output.

See 

 for additional details.

110

Port 1 

Ethernet TX 

Negative

TXN1

AIO

Ethernet TX Negative: Negative output of Port 1 
Ethernet transmitter. See 

 for additional 

information.

111

Port 1 

Ethernet TX 

Positive

TXP1

AIO

Ethernet TX Positive: Positive output of Port 1 
Ethernet transmitter. See 

 for additional 

information.

115

Port 1 

Ethernet RX 

Negative

RXN1

AIO

Ethernet RX Negative: Negative input of Port 1 
Ethernet receiver. See 

 for additional 

information.

116

Port 1 

Ethernet RX 

Positive

RXP1

AIO

Ethernet RX Positive: Positive input of Port 1 
Ethernet receiver. See 

 for additional 

information.