LAN9311 datasheet(25/459 Pages) SMSC

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

Datasheet

SMSC LAN9311/LAN9311i

Revision 1.6 (08-18-09)

DATASHEET

2.2.9

GPIO/LED Controller

The LAN9311/LAN9311i provides 12 configurable general-purpose input/output pins which are

controlled via this module. These pins can be individually configured via the GPIO/LED CSRs to

function as inputs, push-pull outputs, or open drain outputs and each is capable of interrupt generation

with configurable polarity. Two of the GPIO pins (GPIO[9:8]) can be used for IEEE 1588 timestamp

functions, allowing GPIO driven 1588 time clock capture when configured as an input, or GPIO output

generation based on an IEEE 1588 clock target compare event.

In addition, 8 of the GPIO pins can be alternatively configured as LED outputs. These pins, GPIO[7:0]

(nP1LED[3:0] and nP2LED[3:0]), may be enabled to drive Ethernet status LEDs for external indication

of various attributes of the switch ports.

2.3

System Configuration

In a typical application, the LAN9311/LAN9311i Host Bus Interface (HBI) is connected to the host

microprocessor/microcontroller via the asynchronous 16-bit interface, allowing access to the

LAN9311/LAN9311i system configuration and status registers. The LAN9311/LAN9311i utilizes the

internal Host MAC to provide a network path for the host CPU. The LAN9311/LAN9311i may share the

host bus with additional system memory and/or peripherals. For more information on the HBI, refer to

Chapter 8, "Host Bus Interface (HBI)," on page 99.

The 2 Ethernet ports of the LAN9311/LAN9311i must be connected to Auto-MDIX style magnetics for

proper operation on the Ethernet network. Refer to the SMSC Application Note 8.13 “Suggested

Magnetics” for further details.

The LAN9311/LAN9311i also supports optional EEPROM and GPIOs/LEDs. When an EEPROM is

connected, the EEPROM loader can be used to load the initial device configuration from the external

EEPROM via the I2C/Microwire interface.

A system configuration diagram of the LAN9311/LAN9311i in a typical embedded environment can be

seen in Figure 2.2.

Figure 2.2 System Block Diagram

Magnetics

To Ethernet

External

25MHz Crystal

Microprocessor/

Microcontroller

GPIOs/LEDs

(optional)

System

Memory

System

Peripherals

EEPROM

(optional)

LAN9311/LAN9311i

I2C/Microwire

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