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Altera_Forum's avatar
Altera_Forum
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15 years ago

Frequency of StratixIV

Hi, I'am so sorry if there are some mistakes in english. I try to modify the frequency of StratixIV (used the PLL in SOPC builder), always, i obtained with the clock tools the same frequency ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

Could you show a screenshot of your sopc system? Are you sure the Nios CPU is using the correct clock? You should see the pll's output used as a clock in the RTL view.

How do you measure the execution time? What is the order of magnitude of the execution times you are measuring?

What does your loop do? Some actions (ex: i/o) will have an execution time that can be rather independant from the cpu clock.