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LAN9303I-ABZJ

Small Form Factor Three Port 10/100 Managed Ethernet Switch with Single MII/RMII/Turbo MII

SMSC -> Microchip 

Small Form Factor Three Port 10/100 Managed Ethernet Switch with Single MII/RMII/Turbo MII

Datasheet

2.3.3

Ethernet

Magnetics

LAN9303/

LAN9303i

I2C EEPROM/

I2C

I2C slave

MII

MII

MIIM/

SMI

EEPROM

(optional)

10/100

PHY

Figure 2.2 MII MAC Mode

PHY Mode

PHY mode utilizes an external MAC to provide a network path for the CPU. PHY mode supports MII

and RMII interfaces. The external MII/RMII pins must be connected to an external MAC, providing a

communication path to the Switch Fabric. MII PHY mode can operate at 10, 100, or 200Mbps (Turbo

mode). RMII PHY mode can operate at 10 or 100Mbps. In PHY mode, the device may be SMI

managed or I2C managed as detailed in Section 2.3.4, "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 interface. Once operational, if managed, the CPU

can use the I2C interface to read or write the EEPROM.

LAN9303/

LAN9303i

I2C EEPROM/

I2C

I2C slave

MII

MII

MIIM/

SMI

EEPROM

(optional)

10/100

MAC

LAN9303/

LAN9303i

I2C EEPROM/

I2C

I2C slave

RMII

MIIM/

SMI

RMII

EEPROM

(optional)

10/100

MAC

Figure 2.3 MII/RMII PHY Mode

2.3.4 Management Modes

Various modes of management are provided in both MAC and PHY modes of operation. Two separate

interfaces may be used for management: the I2C interface or the SMI/MIIM (Media Independent

Interface Management) slave interface.

The I2C interface runs as an I2C slave. The slave mode is used as a register access path for an

external CPU. The I2C slave and I2C master EEPROM interface are shared interfaces.

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). The slave

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

Revision 1.3 (08-27-09)

20

DATASHEET

SMSC LAN9303/LAN9303i

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