Small Form Factor Three Port 10/100 Managed Ethernet Switch with Single MII/RMII/Turbo MII
Datasheet
3.2
Pin Descriptions
This section contains the descriptions of the device 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
Port 0 MII/RMII Pins
GPIO/LED/Configuration Straps
Serial Management/EEPROM Pins
Miscellaneous Pins
PLL Pins
Core and I/O Power and Ground Pins
Note: A list of buffer type definitions is provided in Section 3.3, "Buffer Types," on page 41.
Note: Please refer to the LAN9303/LAN9303i Reference Schematic and LANCheck Schematic
Checklist on the SMSC website for additional connection information.
Table 3.1 LAN Port 1 Pins
NUM
PINS
BUFFER
TYPE
NAME
SYMBOL
DESCRIPTION
Port 1 Ethernet
TX Negative
TXN1
AIO
Negative output of Port 1 Ethernet transmitter. See
Note 3.1.
1
1
1
1
Port 1 Ethernet
TX Positive
TXP1
RXN1
RXP1
AIO
AIO
AIO
Positive output of Port 1 Ethernet transmitter. See
Note 3.1.
Port 1 Ethernet
RX Negative
Negative input of Port 1 Ethernet receiver. See
Note 3.1.
Port 1 Ethernet
RX Positive
Positive input of Port 1 Ethernet receiver. See
Note 3.1.
Note 3.1 The pin names for the twisted pair pins apply to a normal connection. If HP Auto-MDIX is
enabled and a reverse connection is detected or manually selected, the RX and TX pins
will be swapped internally.
Table 3.2 LAN Port 2 Pins
NUM
PINS
BUFFER
TYPE
NAME
SYMBOL
DESCRIPTION
Port 2 Ethernet
TX Negative
TXN2
AIO
Negative output of Port 2 Ethernet transmitter. See
Note 3.2.
1
1
1
1
Port 2 Ethernet
TX Positive
TXP2
RXN2
RXP2
AIO
AIO
AIO
Positive output of Port 2 Ethernet transmitter. See
Note 3.2.
Port 2 Ethernet
RX Negative
Negative input of Port 2 Ethernet receiver. See
Note 3.2.
Port 2 Ethernet
RX Positive
Positive input of Port 2 Ethernet receiver. See
Note 3.2.
Revision 1.3 (08-27-09)
SMSC LAN9303/LAN9303i
DATA2S4HEET
SMSC [ SMSC CORPORATION ]
