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Table 1-20. DSP Power Domains
Power Domains Description
Real-Time Clock Power Domain This domain powers the real-time clock digital circuits and oscillator pins ( RTC_XI,
(CV
DDRTC
) RTC_XO).
Nominal supply voltage can be 1.05 V through 1.3 V. Note: This domain must be always
powered for proper operation.
This domain cannot be regulated internally, external regulation must be provided.
Core Power Domain This domain powers the digital circuits that include the C55x CPU, on-chip memory, and
(CV
DD
) peripherals.
Nominal supply voltage is either 1.05 V or 1.3 V. This domain can be powered from the
on-chip DSP_LDO.
Digital I/O Power Domain 1 This domain powers all I/Os, except the EMIF I/O, USB I/O, USB oscillator I/O, some of
(DV
DDEMIF
) the analog related digital pins, and the real-time clock power domain I/O.
Nominal supply voltage can be 1.8, 2.5, 2.75, or 3.3 V.
This domain cannot be powered by internal LDOs, external regulation must be provided.
Digital I/O Power Domain 2 This domain powers all EMIF I/O only.
(DV
DDIO
)
Nominal supply voltage can be 1.8, 2.5, 2.75, or 3.3 V.
This domain cannot be powered by internal LDOs, external regulation must be provided.
RTC I/O Power Domain This domain powers the WAKEUP and RTC_CLKOUT pins.
(DV
DDRTC
)
Nominal supply voltage can be 1.8, 2.5, 2.75, or 3.3 V.
This domain cannot be powered by internal LDOs, external regulation must be provided.
PLL Power Domain This domain powers the system clock generator PLL.
(V
DDA_PLL
)
Nominal supply voltage is 1.3 V.
This domain can be powered from the on-chip analog LDO output pin (ANA_LDOO).
Analog Power Domain This domain powers the power management analog circuits and the 10-bit SAR.
(V
DDA_ANA
)
Nominal supply voltage is 1.3 V.
This domain 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.
USB Analog Power Domain This domain powers the USB analog PHY.
(USB_V
DDA1P3
)
Nominal supply voltage is 1.3 V. This domain can be powered from on-chip USB_LDO
output pin (USB_LDOO).
USB Digital Power Domain This domain powers the USB digital module.
(USB_V
DD1P3
)
Nominal supply voltage is 1.3 V. This domain can be powered from on-chip USB_LDO
output pin (USB_LDOO).
USB Oscillator Power Domain This domain powers the USB oscillator.
(USB_V
DDOSC
)
Nominal supply voltage is 3.3 V.
This domain cannot be powered by internal LDOs, external regulation must be provided.
USB Transceiver & Analog Power This domain powers the USB transceiver.
Domain
Nominal supply voltage is 3.3 V.
(USB_V
DDA3P3
)
This domain cannot be powered by internal LDOs, external regulation must be provided.
USB PLL Power Domain This domain powers the USB PLL.
( USB_V
DDPLL
)
Nominal supply voltage is 3.3 V.
This domain cannot be powered by internal LDOs, external regulation must be provided.
LDOI Power Domain (LDOI) This domain powers LDOs, POR comparator, and I/O supply for some pins.
Nominal supply voltage is 1.8 V through 3.6 V. Note: This domain must be always
powered for 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
System Control SPRUFX5A–October 2010–Revised November 2010
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