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Altera_Forum
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17 years ago

Why is the speed of operations not constant? Is the cache the reason?

Hi First of all I'm using Quartus 8.1 and the NiosII IDE 8.1. The Nios II system I set up, processes data from an ADC with the help of a FFT module I added to the processor system. The...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
17 years ago

The only difference between -s and -f I noticed is the absolut time required for an operation, but this is normal this the -f has a higher performance. The timer does not produce any interrupts. I use the Altera Interval Timer IP-core as Timestamp Timer, which is running in an endless loop. I take snapshots to determine the length of an operation e.g. like this

time1 = timestamp();

operation;

time2 = timestamp();

duration = time2 -time1;