How to produce 1hz from 4mhz clock

Replies

• 

  silverscorpion

  Well, you can try to get frequencies like 2 MHz or 1 MHz from a clock of 4 MHz. But getting it down to 1 Hz is way too difficult.
  
  Instead of trying to do so, you can try to generate a separate clock of 1 Hz with an external circuit and use it with your fpga kit. That would be the best way, I can say..
  
  Use a simple oscillator like using 555 to generate a 1 Hz clock..
• 

  debu

  @elavarasan: Its very simple. In Verilog you would:
  
  

  module oneHertzFromFour (input clk4M, output reg clk1Hz)
      reg [22:0]cnt;
      always @(posedge(clk4M)
      begin
          cnt=cnt+1;
          if(cnt==2000000)
              clk1Hz=~clk1Hz;
      end
  end module

  Hope that helps.
  
  Regards,
  
  Debu 😀
• 

  elavarasan

  Thanks Debu but can you give some ideas in gate level modelling
• 

  debu

  @elavarasan: If you synthesize the above verilog code, you will get the gate level diagram. It will be a little different for each FPGA and synthesis tool.
  
  Regards,
  
  Debu 😀
• 

  elavarasan

  Thank you Mr.Devesh.😀