LM3S9792 Datasheet, PDF (816/1279 Pages) Texas Instruments – Stellaris® LM3S9792 Microcontroller

Ethernet Controller
19.2
Signal Description
Table 19-1 on page 816 and Table 19-2 on page 816 list the external signals of the Ethernet Controller
and describe 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 AFSEL bit in the GPIO Alternate Function
Select (GPIOAFSEL) register (page 328) 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 346) 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 304. The remaining signals (with the word "fixed" in the Pin Mux/Pin Assignment
column) have a fixed pin assignment and function.
Table 19-1. Signals for Ethernet (100LQFP)
Pin Name
Pin Number Pin Mux / Pin Pin Type Buffer Type^a Description
Assignment
ERBIAS
33
fixed
O
Analog 12.4-kΩ resistor (1% precision) used internally for
Ethernet PHY.
LED0
59
PF3 (1)
O
TTL
Ethernet LED 0.
LED1
60
PF2 (1)
O
TTL
Ethernet LED 1.
MDIO
58
fixed
I/O
OD
MDIO of the Ethernet PHY.
RXIN
37
fixed
I
Analog RXIN of the Ethernet PHY.
RXIP
40
fixed
I
Analog RXIP of the Ethernet PHY.
TXON
46
fixed
O
TTL
TXON of the Ethernet PHY.
TXOP
43
fixed
O
TTL
TXOP of the Ethernet PHY.
XTALNPHY
17
fixed
O
Analog Ethernet PHY XTALN 25-MHz oscillator crystal
output.
XTALPPHY
16
fixed
I
Analog Ethernet PHY XTALP 25-MHz oscillator crystal
input.
a. The TTL designation indicates the pin has TTL-compatible voltage levels.
Table 19-2. Signals for Ethernet (108BGA)
Pin Name
Pin Number Pin Mux / Pin Pin Type Buffer Type^a Description
Assignment
ERBIAS
J3
fixed
O
Analog 12.4-kΩ resistor (1% precision) used internally for
Ethernet PHY.
LED0
J12
PF3 (1)
O
TTL
Ethernet LED 0.
LED1
J11
PF2 (1)
O
TTL
Ethernet LED 1.
MDIO
L9
fixed
I/O
OD
MDIO of the Ethernet PHY.
RXIN
L7
fixed
I
Analog RXIN of the Ethernet PHY.
RXIP
M7
fixed
I
Analog RXIP of the Ethernet PHY.
TXON
L8
fixed
O
TTL
TXON of the Ethernet PHY.
TXOP
M8
fixed
O
TTL
TXOP of the Ethernet PHY.
XTALNPHY
J1
fixed
O
Analog Ethernet PHY XTALN 25-MHz oscillator crystal
output.
XTALPPHY
J2
fixed
I
Analog Ethernet PHY XTALP 25-MHz oscillator crystal
input.
a. The TTL designation indicates the pin has TTL-compatible voltage levels.
816
June 14, 2010
Texas Instruments-Advance Information