How to produce 1hz from 4mhz clock

elavarasan · 2009-08-29T02:12:12+00:00

The problem is to implement the counter in FPGA kit that uses 4 mhz. But the requirement is the counter should increment exactly at 1 second that is the counter should use 1 hz clock frequency. Can anyone help me in reducing the 4 Mhz clock signal to 1 Hz clock signal by using less circuit component to implement in FPGA kit.

How to produce 1hz from 4mhz clock

elavarasan
@elavarasan-4uyrnr

Updated: Aug 29, 2009

Views: 1.1K

The problem is to implement the counter in FPGA kit that uses 4 mhz. But the requirement is the counter should increment exactly at 1 second that is the counter should use 1 hz clock frequency.

Can anyone help me in reducing the 4 Mhz clock signal to 1 Hz clock signal by using less circuit component to implement in FPGA kit.

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silverscorpion

Member • Aug 29, 2009

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..

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debu

Member • Aug 29, 2009

@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 😀

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elavarasan

Member • Aug 29, 2009

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

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debu

Member • Aug 29, 2009

@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 😀

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elavarasan

Member • Aug 29, 2009

Thank you Mr.Devesh.😀

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