16.2 Signal Description
The following table lists the external signals of the Ethernet Controller and describes the function
of each. The Ethernet LED signals are alternate functions for GPIO signals and default to be GPIO
signals at reset. The column in the table below titled "Pin Mux/Pin Assignment" lists the GPIO pin
placement for the LED signals. The AFSELbit in the GPIO Alternate Function Select (GPIOAFSEL)
register (page 430) should be set to choose the LED function. The number in parentheses is the
encoding that must be programmed into the PMCn field in the GPIO Port Control (GPIOPCTL)
register (page 447) to assign the LED0 and LED1 signals to the specified GPIO port pins. For more
information on configuring GPIOs, see “General-Purpose Input/Outputs (GPIOs)” on page 408. The
remaining signals (with the word "fixed" in the Pin Mux/Pin Assignment column) have a fixed pin
assignment and function.
Table 16-1. Ethernet Signals (100LQFP)
DescriptionBuffer Type
a
Pin TypePin Mux / Pin
Assignment
Pin NumberPin Name
12.4-kΩ resistor (1% precision) used internally for
Ethernet PHY.
AnalogOfixed41ERBIAS
Ethernet LED 0.TTLOPF3 (1)59LED0
Ethernet LED 1.TTLOPF2 (1)60LED1
MDIO of the Ethernet PHY.ODI/Ofixed58MDIO
RXIN of the Ethernet PHY.AnalogIfixed37RXIN
RXIP of the Ethernet PHY.AnalogIfixed40RXIP
TXON of the Ethernet PHY.TTLOfixed46TXON
TXOP of the Ethernet PHY.TTLOfixed43TXOP
Ethernet PHY XTALN 25-MHz oscillator crystal
output. Leave this pin unconnected when using a
single-ended 25-MHz clock input connected to the
XTALPPHY pin.
AnalogOfixed17XTALNPHY
Ethernet PHY XTALP 25-MHz oscillator crystal
input or external clock reference input.
AnalogIfixed16XTALPPHY
a. The TTL designation indicates the pin has TTL-compatible voltage levels.
Table 16-2. Ethernet Signals (108BGA)
DescriptionBuffer Type
a
Pin TypePin Mux / Pin
Assignment
Pin NumberPin Name
12.4-kΩ resistor (1% precision) used internally for
Ethernet PHY.
AnalogOfixedK3ERBIAS
Ethernet LED 0.TTLOPF3 (1)J12LED0
Ethernet LED 1.TTLOPF2 (1)J11LED1
MDIO of the Ethernet PHY.ODI/OfixedL9MDIO
RXIN of the Ethernet PHY.AnalogIfixedL7RXIN
RXIP of the Ethernet PHY.AnalogIfixedM7RXIP
TXON of the Ethernet PHY.TTLOfixedL8TXON
TXOP of the Ethernet PHY.TTLOfixedM8TXOP
Ethernet PHY XTALN 25-MHz oscillator crystal
output. Leave this pin unconnected when using a
single-ended 25-MHz clock input connected to the
XTALPPHY pin.
AnalogOfixedJ1XTALNPHY
759July 24, 2012
Texas Instruments-Production Data
Stellaris
®
LM3S6G65 Microcontroller
OBSOLETE: TI has discontinued production of this device.