LAN9313 datasheet(23/398 Pages) SMSC

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Three Port 10/100 Managed Ethernet Switch with MII

Datasheet

SMSC LAN9313/LAN9313i

Revision 1.2 (04-08-08)

DATASHEET

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

Modes of Operation

The LAN9313/LAN9313i is designed to integrate into various embedded environments. To accomplish

compatibility with a wide range of applications, the LAN9313/LAN9313i can operate in 2 different

modes (MAC mode and PHY mode) and under various management conditions (unmanaged, SMI

mana ge d, I 2 C mana ged , o r SPI mana ge d). T he mo de an d man age ment typ e of th e

LAN9313/LAN9313i is determined by the MII_mode_strap and mngt_mode_strap[1:0] configuration

straps respectively. These modes and management types are detailed in the following sections.

Figure 2.2 displays a typical system configuration for each mode and management type supported by

the LAN9313/LAN9313i.

2.3.1

MAC Mode

The LAN9313/LAN9313i MAC mode utilizes an external PHY, which is connected to the MII pins, to

provide a third Ethernet network connection. In this mode, the LAN9313/LAN9313i acts as a MAC,

providing a communication path between the switch fabric and the external PHY. In MAC mode, the

LAN9313/LAN9313i may be unmanaged, SMI managed, I2C managed, or SPI managed as detailed in

Section 2.3.3, "Management Modes".

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. Once operational, if

managed, the CPU can use the I2C/Microwire interface to read or write the EEPROM.

2.3.2

PHY Mode

The LAN9313/LAN9313i PHY mode utilizes an external MAC to provide a network path for the host

CPU. The external MII pins of the LAN9313/LAN9313i must be connected to an external MAC,

providing a communication path to the switch fabric. In PHY mode, the LAN9313/LAN9313i may be

unmanaged, SMI managed, I2C managed, or SPI managed as detailed in Section 2.3.3, "Management

Modes".

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. Once operational, if

managed, the CPU can use the I2C/Microwire interface to read or write the EEPROM.

2.3.3

Management Modes

The LAN9313/LAN9313i provides various modes of management in both MAC and PHY modes of

operation. Two separate interfaces may be used to manage the LAN9313/LAN9313i: the I2C/SPI slave

interface or the SMI/MIIM(Media Independent Interface Management) slave interface.

The I2C/SPI interface runs as either an I2C slave or SPI slave and is used as a register access path

for an external CPU.

The SMI/MIIM interface runs as either an SMI/MIIM slave or MIIM master. The master mode is used

to access an external PHYs registers under CPU control (assuming the CPU is using I2C or SPI). The

slave mode is used for register access by the CPU or external MAC and provides access to either the

internal Port 1&2 PHY registers or to all non-PHY registers (using addresses 16-31 and a non-standard

extended address map). MIIM and SMI use the same pins and protocol and differ only in that SMI

provides access to all internal registers while MIIM provides access to only the Port 1&2 PHY registers.

A special mode provides access to the Virtual PHY, which mimics the register operation of a single

port standalone PHY. This is used for software compatibility during unmanaged operation.

The selection of LAN9313/LAN9313i modes is determined at startup via the MII_mode_strap and

mngt_mode_strap[1:0] configuration straps as detailed in Table 2.1. System configuration diagrams for

each mode of the LAN9313/LAN9313i are provided in Figure 2.2.

LAN9313 Datasheet(PDF) 23 Page - SMSC Corporation

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