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Elyouss's avatar
Elyouss
Icon for New Contributor rankNew Contributor
4 years ago

Niosii PLL

Hello I'm a beginner in programming FPGA devices. I have to create several frequencies multiplier using PLL from an one Hertz input signal. With a nios processor I have to be able to make a program ...
Ash_R_Altera's avatar
Ash_R_Altera
Icon for Regular Contributor rankRegular Contributor
4 years ago

Hi,

Agree with @ak6dn comments.


However, I am curious to know why do you have such a low frequency input signal? You can use any crystal oscillator on the board of higher frequency which is within spec of FPGA PLLs and then use it to generate more frequencies internally.


Regards


  • Elyouss's avatar
    Elyouss
    Icon for New Contributor rankNew Contributor
    4 years ago

    Hi,

    because my project is to multiply the frequency from an external source and we are working on low frequencies. But yes, right now, I'm using the board's oscillator just to test my PLL in high frequency and to understand fully how to use Qsys. I want to connect the internal clock (pin G21) to one PLL and the PLL to the output pin R16 from the expansion header. But I haven't any signal when I test it on an oscilloscope. Do we have to program the nios processor with C to make an easy handling like that ?

    Best Regards