LM3S6422 Datasheet, PDF (558/609 Pages) Texas Instruments – Stellaris® LM3S6422 Microcontroller

Signal Tables
Table 16-9. Connections for Unused Signals (100-pin LQFP) (continued)
Function
Signal Name
Pin Number
Acceptable Practice
Preferred Practice
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 165
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 16-10 on page 558 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 16-10. Connections for Unused Signals, 108-pin BGA
Function
Signal Name
Pin Number
Acceptable Practice
Preferred Practice
ADC
ADC0
B1
NC
ADC1
A1
GNDA
ERBIAS
K3
Connect to GND through
Connect to GND through
12.4-kΩ resistor.
12.4-kΩ resistor.
GNDPHY
C8
C9
GND
GND
K4
MDIO^a
L9
NC
NC
RXIN
L7
NC
GND
Ethernet
RXIP
M7
NC
TXON
L8
NC
GND
GND
TXOP
M8
NC
GND
VCCPHY
C10
D10
D11
XTALNPHY^a
J1
XTALPPHY^a
J2
VDD
NC
NC
VDD
NC
GND
GPIO
All unused GPIOs
-
NC
GND
No Connects
NC
-
NC
NC
OSC0
L11
NC
GND
System
Control
OSC1
RST
M11
NC
NC
H11
Pull up as shown in Figure Connect through a capacitor to
5-1 on page 165
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.
558
June 18, 2012
Texas Instruments-Production Data