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TMS320C6748
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SPRS590G –JUNE 2009–REVISED JANUARY 2017
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Device ComparisonCopyright © 2009–2017, Texas Instruments Incorporated
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.
Table 3-32. Unused USB0 and USB1 Signal Configurations
SIGNAL NAME
Configuration (When USB0 and
USB1 are not used)
Configuration (When only USB1 is
not used)
Configuration (When USB1 is used
and USB0 is not used)
USB0_DM No Connect Use as USB0 function VSS or No Connect
USB0_DP No Connect Use as USB0 function VSS or No Connect
USB0_ID No Connect Use as USB0 function No Connect
USB0_VBUS No Connect Use as USB0 function No Connect
USB0_DRVVBU
S
No Connect Use as USB0 function No Connect
USB0_VDDA33 No Connect 3.3V 3.3V
USB0_VDDA18 No Connect 1.8V 1.8V
USB0_VDDA12 Internal USB PHY output connected to an external 0.22-μF filter capacitor
USB1_DM No Connect VSS or No Connect Use as USB1 function
USB1_DP No Connect VSS or No Connect Use as USB1 function
USB1_VDDA33 No Connect No Connect Use as USB1 function
USB1_VDDA18 No Connect No Connect Use as USB1 function
USB_REFCLKIN
No Connect or other peripheral
function
Use for USB0 or other peripheral
function
Ext Ref Clk / USB0 PHY PLL output
(see SPRUH77 Device Clocking)
USB_CVDD 1.2V 1.2V 1.2V
Table 3-33. Unused SATA Signal Configuration
SIGNAL NAME Configuration
SATA_RXP No Connect
SATA_RXN No Connect
SATA_TXP No Connect
SATA_TXN No Connect
SATA_REFCLKP No Connect
SATA_REFCLKN No Connect
SATA_MP_SWITCH May be used as GPIO or other peripheral function
SATA_CP_DET May be used as GPIO or other peripheral function
SATA_CP_POD May be used as GPIO or other peripheral function
SATA_LED May be used as GPIO or other peripheral function
SATA_REG No Connect
SATA_VDDR No Connect
SATA_VDD
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
conservation.
SATA_VSS VSS
Table 3-34. Unused RTC Signal Configuration
SIGNAL NAME Configuration
RTC_XI May be held high (CVDD) or low
RTC_XO No Connect
RTC_ALARM May be used as GPIO or other peripheral function
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