Power Management
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Table 1-20. DSP Power Domains

PowerDomains Description
Real-TimeClock Power Domain Thisdomain powers the real-time clock digital circuits and oscillator pins ( RTC_XI,
(CVDDRTC) RTC_XO).
Nominalsupply voltage can be 1.05 V through 1.3 V. Note: This domain must be always
poweredfor proper operation.
Thisdomain cannot be regulated internally, external regulation must be provided.
CorePower Domain Thisdomain powers the digital circuits that include the C55x CPU, on-chip memory, and
(CVDD) peripherals.
Nominalsupply voltage is either 1.05 V or 1.3 V. This domain can be powered from the
on-chipDSP_LDO.
DigitalI/O Power Domain 1 Thisdomain powers all I/Os, except the EMIF I/O, USB I/O, USB oscillator I/O, some of
(DVDDEMIF) theanalog related digital pins, and the real-time clock power domain I/O.
Nominalsupply voltage can be 1.8, 2.5, 2.75, or 3.3 V.
Thisdomain cannot be powered by internal LDOs, external regulation must be provided.
DigitalI/O Power Domain 2 Thisdomain powers all EMIF I/O only.
(DVDDIO)Nominalsupply voltage can be 1.8, 2.5, 2.75, or 3.3 V.
Thisdomain cannot be powered by internal LDOs, external regulation must be provided.
RTCI/O Power Domain Thisdomain powers the WAKEUP and RTC_CLKOUT pins.
(DVDDRTC)Nominalsupply voltage can be 1.8, 2.5, 2.75, or 3.3 V.
Thisdomain cannot be powered by internal LDOs, external regulation must be provided.
PLLPower Domain Thisdomain powers the system clock generator PLL.
(VDDA_PLL)Nominalsupply voltage is 1.3 V.
Thisdomain can be powered from the on-chip analog LDO output pin (ANA_LDOO).
AnalogPower Domain Thisdomain powers the power management analog circuits and the 10-bit SAR.
(VDDA_ANA)Nominalsupply voltage is 1.3 V.
Thisdomain can be powered from the on-chip analog LDO output pin (ANA_LDOO).
Note:When externally powered, this domain must be always powered for proper
operation.
USBAnalog Power Domain Thisdomain powers the USB analog PHY.
(USB_VDDA1P3)Nominalsupply voltage is 1.3 V. This domain can be powered from on-chip USB_LDO
outputpin (USB_LDOO).
USBDigital Power Domain This domain powers the USB digital module.
(USB_VDD1P3)Nominalsupply voltage is 1.3 V. This domain can be powered from on-chip USB_LDO
outputpin (USB_LDOO).
USBOscillator Power Domain Thisdomain powers the USB oscillator.
(USB_VDDOSC)Nominalsupply voltage is 3.3 V.
Thisdomain cannot be powered by internal LDOs, external regulation must be provided.
USBTransceiver & Analog Power Thisdomain powers the USB transceiver.
Domain Nominalsupply voltage is 3.3 V.
(USB_VDDA3P3)Thisdomain cannot be powered by internal LDOs, external regulation must be provided.
USBPLL Power Domain Thisdomain powers the USB PLL.
(USB_VDDPLL )Nominal supply voltage is 3.3 V.
Thisdomain cannot be powered by internal LDOs, external regulation must be provided.
LDOIPower Domain (LDOI) Thisdomain powers LDOs, POR comparator, and I/O supply for some pins.
Nominalsupply voltage is 1.8 V through 3.6 V. Note: This domain must be always
poweredfor proper operation.
1.5.3 Clock Management

As mentioned in Section 1.3.2, there are several clock domains within the DSP. The device supports clock

gating features that allows software to disable clocks to entire clock domains or modules within a domain

in order to reduce the domain's active power consumption to very-near zero (a very small amount of logic

will still see a clock).

34 SystemControl SPRUFX5A–October 2010 –Revised November 2010
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