lan9303m Standard Microsystems Corp., lan9303m Datasheet - Page 19

• Manufacturer Part Number: lan9303m
• Description: Small Form Factor Three Port 10/100 Managed Ethernet Switch With Dual Mii/rmii/turbo Mii
• Manufacturer: Standard Microsystems Corp.

Small Form Factor Three Port 10/100 Managed Ethernet Switch with Dual MII/RMII/Turbo MII
Datasheet
SMSC LAN9303M/LAN9303Mi
2.2.9
2.3
2.3.1
2.3.2
runs upon a pin reset (nRST), power-on reset (POR), digital reset, or upon the issuance of a EEPROM
RELOAD command.
GPIO/LED Controller
Six configurable general-purpose input/output pins are provided 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.
The GPIO pins can be alternatively configured as LED outputs to drive Ethernet status LEDs for
external indication of various attributes of the switch ports.
The LAN9303M/LAN9303Mi is designed to integrate into various embedded environments. To
accomplish compatibility with a wide range of applications, the LAN9303M/LAN9303Mi ports can
operate in the following modes:
The mode of the device is determined by the P0_MODE[2:0] (Port 0) and P1_MODE[2:0] (Port 1) pin
straps.
The device can also be placed into the following management modes:
The management mode is determined by the MNGT1_LED4P and MNGT0_LED3P pin straps. These
modes are detailed in the following sections.
Port 0 mode and management type supported by the device. Refer to
on page 128
Internal PHY Mode
Internal PHY mode (Port 1 and Port 2) utilizes the internal PHY for the network connection. The Switch
Engine MAC’s MII port is connected internally to the internal PHY in this mode. Internal PHY mode
can operate at 10Mbps or 100Mbps.
When an EEPROM is connected, the EEPROM loader can be used to load the initial device
configuration from the external EEPROM via the I
can use the I
MAC Mode
Both Port 0 and Port 1 can be configured independently into MAC mode. MAC mode utilizes an
external PHY, which is connected to the port’s MII pins, to provide an Ethernet network connection. In
this mode, the port acts as a MAC, providing a communication path between the Switch Fabric and
the external PHY. MAC mode can operate at 10, 100, or 200Mbps (Turbo mode). In MAC mode, the
device may be SMI managed or I
When an EEPROM is connected, the EEPROM loader can be used to load the initial device
configuration from the external EEPROM via the I
can use the I
Modes of Operation
Port 0 - Independently configured for MII MAC, MII PHY, RMII PHY modes
Port 1 - Independently configured for internal PHY, MII MAC, MII PHY, RMII PHY modes
Port 2 - Internal PHY mode
SMI managed
I
2
C managed
for additional information on the usage of MII signals in each supported mode.
2
2
C interface to read or write the EEPROM.
C interface to read or write the EEPROM.
2
C managed as detailed in
DATASHEET
19
Figure 2.4
2
2
C interface. Once operational, if managed, the CPU
C interface. Once operational, if managed, the CPU
displays a typical system configuration for each
Section 2.3.4, "Management
Chapter 9, "MII Data Interfaces,"
Revision 1.3 (08-27-09)
Modes".