DM385, DM388
SPRS821D –MARCH 2013–REVISED DECEMBER 2013
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7.2.5 Dual Voltage I/Os
The device supports dual voltages on some of its I/Os. These I/Os are partitioned into the following
groups, and each group has its own dedicated supply pins: DVDD, DVDD_GPMC, DVDD_C, and
DVDD_SD. The supply voltage for each group can be independently powered with either 1.8 V or 3.3 V.
For the mapping between pins and power groups, see Section 3.3, Terminal Functions of the datasheet.
In addition, the I/O voltage on the DDR interface is independently selectable between 1.35 V, 1.5 V or
1.8 V to support various DDR device types.
7.2.6 I/O Power-Down Modes
On the device, there are power-down modes available for the following PHYs:
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•
•
•
•
•
Video DACs
DDR
USB
HDMI
CSI2
PCIE
When a PHY controller is in a power domain that is to be turned "OFF", software must configure the
corresponding PHY into power-down mode, prior to putting the power domain in the "OFF" state.
132
Power, Reset, Clocking, and Interrupts
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