AM1806_16 Datasheet, PDF (54/245 Pages) Texas Instruments – AM1806 ARM® Microprocessor

AM1806
SPRS658F – FEBRUARY 2010 – REVISED MARCH 2014
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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
USB_REFCLKIN
USB_CVDD
Table 3-28. Unused USB0 Signal Configurations
Configuration
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 or other peripheral function
1.2V
SIGNAL NAME
RTC_XI
RTC_XO
RTC_ALARM
RTC_CVDD
RTC_VSS
Table 3-29. Unused RTC Signal Configuration
Configuration
May be held high (CVDD) or low
No Connect
May be used as GPIO or other peripheral function
Connect to CVDD
VSS
Table 3-30. Unused DDR2/mDDR Controller Signal Configuration
SIGNAL NAME
Configuration ⁽¹⁾
DDR_D[15:0]
No Connect
DDR_A[13:0]
No Connect
DDR_CLKP
No Connect
DDR_CLKN
No Connect
DDR_CKE
No Connect
DDR_WE
No Connect
DDR_RAS
No Connect
DDR_CAS
No Connect
DDS_CS
No Connect
DDR_DQM[1:0]
No Connect
DDR_DQS[1:0]
No Connect
DDR_BA[2:0]
No Connect
DDR_DQGATE0
No Connect
DDR_DQGATE1
No Connect
DDR_ZP
No Connect
DDR_VREF
No Connect
DDR_DVDD18
No Connect
(1) The DDR2/mDDR input buffers are enabled by default on device power up and a maximum current draw of 25mA can result on the 1.8V
supply. To minimize power consumption, the DDR2/mDDR controller input receivers should be placed in power-down mode by setting
VTPIO[14] = 1.
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