LM3S6100 Datasheet, PDF (510/559 Pages) Texas Instruments – Stellaris® LM3S6100 Microcontroller

Signal Tables
Table 15-8. GPIO Pins and Alternate Functions (continued)
IO
Pin Number
Multiplexed Function
PD3
H1
PF0
M9
PF1
H12
PF2
J11
LED1
PF3
J12
LED0
Multiplexed Function
15.3
Connections for Unused Signals
Table 15-9 on page 510 show how to handle signals for functions that are not used in a particular
system implementation for devices that are in a 100-pin LQFP package. Two options are shown in
the table: an acceptable practice and a preferred practice for reduced power consumption and
improved EMC characteristics. If a module is not used in a system, and its inputs are grounded, it
is important that the clock to the module is never enabled by setting the corresponding bit in the
RCGCx register.
Table 15-9. Connections for Unused Signals (100-pin LQFP)
Function
Signal Name
Pin Number
Acceptable Practice
Preferred Practice
ERBIAS
41
Connect to GND through Connect to GND through 12.4-kΩ
12.4-kΩ resistor.
resistor.
GNDPHY
42
85
GND
GND
86
MDIO^a
58
NC
NC
RXIN
37
NC
GND
Ethernet
RXIP
40
NC
TXON
46
NC
GND
GND
TXOP
43
NC
GND
VCCPHY
36
83
84
XTALNPHY^a
17
XTALPPHY^a
16
VDD
NC
NC
VDD
NC
GND
GPIO
All unused GPIOs
-
NC
GND
No Connects
NC
-
NC
NC
OSC0
48
NC
GND
System
Control
OSC1
RST
49
NC
NC
64
Pull up as shown in Figure Connect through a capacitor to
5-1 on page 162
GND as close to pin as possible
a. Note that the Ethernet PHY is powered up by default. The PHY cannot be powered down unless a clock source is provided
and the MDIO pin is pulled up through a 10-kΏ resistor.
Table 15-10 on page 511 show how to handle signals for functions that are not used in a particular
system implementation for devices that are in a 108-pin BGA package. Two options are shown in
the table: an acceptable practice and a preferred practice for reduced power consumption and
improved EMC characteristics. If a module is not used in a system, and its inputs are grounded, it
510
June 18, 2012
Texas Instruments-Production Data