DVS

• As frequency varies, Vdd must vary in order to optimize energy consumption. But the SW is not aware of minimum required supply voltage for a given speed. It is a function of hw implementation, process variation and temperature

• A ring oscillator provides this translation

ARM8

16KB

cache

Co-proc

Write

buffer

V

C

O

Regulator

64KB SRAM

I/O Chip

B

U

S

Fdesired

Vdd

V battery

CPU

3.3V

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