Introduction - Analog Devices VisualDSP++ 5.0 Service Manual

Introduction

Introduction
The power management (PM) module provides access to all aspects of
dynamic power management:
• Dynamic switching from one operating mode (full-on, active,
sleep, deep sleep, and hibernate) to another
• Dynamic setting of voltage levels and clock frequencies to ensure
that an application can be tuned to achieve the best performance
while minimizing power consumption
• When coupled with the EBIU module, enables the SDRAM
settings to be adjusted upon changes to the system clock to ensure
that the best performance is obtained for the complete system.
For more information about the EBIU module, see
Interface Unit Module" on page
The module supports two strategies for setting the core and system clock
frequencies:
• For a given voltage level, the core clock (
available frequency. The system clock (
• For a given combination of core clock and system clock frequen-
cies, the valid values nearest to the chosen ones are used and the
voltage level of the processor is adjusted accordingly.
In both cases, validity checks are performed at all stages, ensuring that the
processor is not stalled or harmed.
"PM Module Operation – Getting Started" on page 3-3
basic operating stages required to use the power management module.
3-2
4-1.
SCLK
VisualDSP++ 5.0 Device Drivers and System
Services Manual for Blackfin Processors
"External Bus
) is set to the highest
CCLK
) is set accordingly.
describes the