LAN9312 datasheet(28/458 Pages) SMSC

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High Performance Two Port 10/100 Managed Ethernet Switch with 32-Bit Non-PCI CPU Interface

Datasheet

Revision 1.2 (04-08-08)

SMSC LAN9312

DATASHEET

3.2

Pin Descriptions

This section contains the descriptions of the LAN9312 pins. The pin descriptions have been broken

into functional groups as follows:

LAN Port 1 Pins

LAN Port 2 Pins

LAN Port 1 & 2 Power and Common Pins

Host Bus Interface Pins

EEPROM Pins

Dedicated Configuration Strap Pins

Miscellaneous Pins

PLL Pins

Core and I/O Power and Ground Pins

No-Connect Pins

Note: A list of buffer type definitions is provided in Section 1.2, "Buffer Types," on page 18.

Table 3.1 LAN Port 1 Pins

NAME

SYMBOL

BUFFER

TYPE

DESCRIPTION

89-92

Port 1 LED

Indicators

nP1LED[3:0]

OD12

LED Indicators: When configured as LED outputs

via the LED Configuration Register (LED_CFG),

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 LED Configuration Register

(LED_CFG), these general purpose signals are

fully programmable as either push-pull outputs,

open-drain outputs or Schmitt-triggered inputs by

writing the General Purpose I/O Configuration

Data & Direction Register (GPIO_DATA_DIR). The

pull-ups are enabled in GPIO mode. The input

buffers are disabled when set as an output.

Note:

See Chapter 13, "GPIO/LED Controller,"

on page 162 for additional details.

110

Port 1

Ethernet TX

Negative

TXN1

AIO

Ethernet TX Negative: Negative output of Port 1

Ethernet transmitter. See Note 3.1 for additional

information.

111

Port 1

Ethernet TX

Positive

TXP1

AIO

Ethernet TX Positive: Positive output of Port 1

Ethernet transmitter. See Note 3.1 for additional

information.

115

Port 1

Ethernet RX

Negative

RXN1

AIO

Ethernet RX Negative: Negative input of Port 1

Ethernet receiver. See Note 3.1 for additional

information.

116

Port 1

Ethernet RX

Positive

RXP1

AIO

Ethernet RX Positive: Positive input of Port 1

Ethernet receiver. See Note 3.1 for additional

information.

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