Power supply stability can be assured either by a time delay or by an analog
measurement. Use of a time delay is risk
y, since there will always be a desire to
implement the minimum possible delay for enhanced processor response time.
Open-loop operation is simplifi ed by creating an APC module to off-load the voltage
scaling and clock management from the processor. The APC approach supports a
common software API allowing the DVS function to be easily accessed by applications
or the operating system. Providing a standard interface to the external power supply
also simplifi es system design and facilitates second-source ...
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