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Altera_Forum's avatar
Altera_Forum
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16 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
16 years ago

Hi,

I verified the custom instructions separately and they have a constant duration. Your tip of changing the float to integers is very good and increases the performance. Nice!

I tried to monitor the SRAM access with the SignalTap to, but I do not have enough internal memory available in my design to monitor enough data, because the absolute times are much higher than I mentioned. 20ns and 100ns were just examples. Maybe the integer multiplication and addition reduces times so that I can monitor more valuable data.