Datasheet

Table 21-9. Connections for Unused Signals (100-pin LQFP) (continued)
Preferred PracticeAcceptable PracticePin NumberSignal NameFunction
Connect to GND through
12.4-kΩ resistor.
Connect to GND through
12.4-kΩ resistor.
41ERBIAS
Ethernet
GNDGND42
85
86
GNDPHY
NCNC58MDIO
a
GNDNC37RXIN
GNDNC40RXIP
GNDNC46TXON
GNDNC43TXOP
VDDVDD36
83
84
VCCPHY
NCNC17XTALNPHY
a
GNDNC16XTALPPHY
a
GNDNC-All unused GPIOsGPIO
NCNC51HIB
Hibernate
GNDNC55VBAT
GNDNC50WAKE
GNDNC52XOSC0
NCNC53XOSC1
NCNC-NCNo Connects
GNDNC48OSC0
System
Control
NCNC49OSC1
Connect through a capacitor to
GND as close to pin as possible
Pull up as shown in Figure
5-1 on page 177
64RST
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 21-10 on page 745 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
is important that the clock to the module is never enabled by setting the corresponding bit in the
RCGCx register.
Table 21-10. Connections for Unused Signals, 108-pin BGA
Preferred PracticeAcceptable PracticePin NumberSignal NameFunction
GNDANCB1
A1
B3
B2
ADC0
ADC1
ADC2
ADC3
ADC
745June 18, 2012
Texas Instruments-Production Data
Stellaris
®
LM3S8962 Microcontroller
NRND: Not recommended for new designs.