Analog Devices SHARC ADSP-214 Series Hardware Reference Manual page 777

General Notes on Power Savings
The following are some additional methods for reducing power.
• The lower the operation frequency, the lower the power consump-
tion. The core and peripherals should be operated at the lowest
frequency that meets the system's requirements. Active power is
proportional to the processor's core clock frequency.
• Reducing the case temperature lowers leakage power. Leakage
power increases exponentially to junction temperature.
• For core pauses programs should execute the
Note that an interrupt is required to release the processor from
.
IDLE
• Don't leave input pins floating. In some cases leakage draws cur-
rent in the region of milliamps. For more information, consult the
product specific data sheet. If an external resistor is problematic,
change the input to an output if possible (flag input).
• If a DAI/DPI pin is not being used, its pin enable (for example
DAI_PBENxx_I
be connected to low.
• Disable the S/PDIF receiver and its digital PLL from the S/PDIF
receiver. By default the S/PDIF receiver is enabled. If not required
set the
DIR_RESET
produce unwanted switching noise if enabled.
Programming Models
For SDRAM programming models, see
(ADSP-2147x/ADSP-2148x)" on page
ADSP-214xx SHARC Processor Hardware Reference
www.BDTIC.com/ADI
) and its input (
DAI_PBxx_I
bit (=1) to disable the digital PLL which may
3-17.
Power Management
instruction.
IDLE
) for its pin buffer should
"SDRAM Controller
22-13