Honored ContributorI intend to design a PWM block by Freq input(interger 16bit ).
----------------------------------------------------------------------- Now I use a division IP core to caculate the counter by a fixed value divide a "16bit freq" which can reach my goal.But is it a simple way to generate the PWM by a 16bit interger Freq input?I'm really appreciate for your idea!
Honored ContributorA pwm generator has two parameters, frequency and duty cycle, so it's not clear what you want to achieve. Generating a pulse frequency proportional to control variable can be easily done by a standard NCO scheme: adding the frequency control word continuously to a phase accumulator.
Honored ContributorFvm,thanks for the quick response.I do know the NCO function in quartus,which I want to achieve is generate a adjustable freq 50% duty square waveform.And use as less logic cell as possible. I think how to process the freq value is the key.
Honored Contributorsignal freq: unsigned(15 downto 0);
signal accu: unsigned(19 downto 0);
if rising_edge(clk) then
accu <= accu + freq;
end if;
square_out <= accu(19);Exllent,Fvm.This is really I need. :)Thank you very much.
