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Overclocking

A project log for Atmel SAM G55 development board

Small, simple SAM G55 development board with extra functions

x-labzx-labz 10/20/2017 at 13:370 Comments

This experiment shows the overclocking results of the Atmel SAMG55 ARM Cortex M4F MCU.

The settings used:

- 3.3V supply voltage

- CPU clock from the external 32.768 KHz crystal multiplied by the internal PLL

- USB HID stack was running parallel 

- 16K cache

- 5 flash wait states

- application runs from on-chip flash

- test application is the encoding + decoding of a 320 sample frame with CODEC2 700C algorithm (http://www.rowetel.com/?page_id=452)

The dataset:

freq.120 MHz 130 MHz 140 MHz 150 MHz 160 MHz
encode +
decode time
28,5 ms 26,5 ms  25 ms  23 ms  21,5 ms 

120 MHz is the maximal CPU clock frequency allowed officially. The MCU was running stable at 160 MHz with continuous USB HID data communication. 

The experiment shows, that 33% overclocking is still stable. 

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