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Altera_Forum's avatar
Altera_Forum
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17 years ago

frequency of NIOS

hi,

I would like to know if the NIOS II can operate with a frequency inférier to 50 MHz (42 MHz for example)

2 Replies

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    17 years ago

    Yes. Just set the CPU frequency in the SOPC/CPU configuration and adjust your PLL or external clock to drive at the same frequency. The timing analyser should be used to confirm that you can run at the intended frequency (or what the maximum could be if you decided to increase it).

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    17 years ago

    Know that if you're using the jtag interface (debug or jtag_uart), you're minimum clock frequency has to be ~2x the maximum that the JTAG chain will be driven at (~8MHz). To be safe, you shouldn't go below 20MHz.