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AM1808
SPRS653E – FEBRUARY 2010 – REVISED MARCH 2014
3.8
Unused Pin Configurations
All signals multiplexed with multiple functions may be used as an alternate function if a given peripheral is
not used. Unused non-multiplexed signals and some other specific signals should be handled as specified
in the tables below.
If NMI is unused, it should be pulled-high externally through a 10k-ohm resistor to supply DVDD3318_B.
SIGNAL NAME
USB0_DM
USB0_DP
USB0_ID
USB0_VBUS
USB0_DRVVBUS
USB0_VDDA33
USB0_VDDA18
USB0_VDDA12
USB1_DM
USB1_DP
USB1_VDDA33
USB1_VDDA18
USB_REFCLKIN
USB_CVDD
SIGNAL NAME
SATA_RXP
SATA_RXN
SATA_TXP
SATA_TXN
SATA_REFCLKP
SATA_REFCLKN
SATA_MP_SWITCH
SATA_CP_DET
SATA_CP_POD
SATA_LED
SATA_REG
SATA_VDDR
SATA_VDD
SATA_VSS
SIGNAL NAME
RTC_XI
RTC_XO
RTC_ALARM
RTC_CVDD
58
Device Overview
Table 3-30. Unused USB0 and USB1 Signal Configurations
Configuration (When USB0 and USB1 are not
used)
No Connect
No Connect
No Connect
No Connect
No Connect
No Connect
No Connect
Internal USB PHY output connected to an external 0.22-μF filter capacitor
No Connect
No Connect
No Connect
No Connect
No Connect or other peripheral function
1.2V
Table 3-31. Unused SATA Signal Configuration
Prior to silicon revision 2.0, this supply must be connected to a static 1.2V nominal supply.
For silicon revision 2.0 and later, this supply may be left unconnected for additional power
Table 3-32. Unused RTC Signal Configuration
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Configuration (When only USB1 is not used)
Use for USB0 or other peripheral function
Configuration
No Connect
No Connect
No Connect
No Connect
No Connect
No Connect
May be used as GPIO or other peripheral function
May be used as GPIO or other peripheral function
May be used as GPIO or other peripheral function
May be used as GPIO or other peripheral function
No Connect
No Connect
conservation.
VSS
Configuration
May be held high (CVDD) or low
No Connect
May be used as GPIO or other peripheral function
Connect to CVDD
Copyright © 2010–2014, Texas Instruments Incorporated
AM1808
www.ti.com
Use as USB0 function
Use as USB0 function
Use as USB0 function
Use as USB0 function
Use as USB0 function
3.3V
1.8V
VSS or No Connect
VSS or No Connect
No Connect
No Connect
1.2V
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