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help me to find frequency divider f/3

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saikumar486

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using asynchronous counter frequency divider i.e., i need to calculate f/3 how to design ??
 

Thanks shah ! will u elaborate it !!if u don't mine but in my point of view even division is ok i.e., using one flipflop(f/2) but how to divide frequency with odd number!!
 

present_state -> next_state
00 -> 01
01 -> 10
10 -> 00

Make the 2-bit counter as shown above, bit[1] in above counter will have frequency f/3 of original counter clock. Note duty cycle is not 50%.
 
here is the code i ve wriiten for frequency divide by 3, hope it helps u...
its a vhdl program n the final result is the variable clkout.
 

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  • fdivby3.txt
    992 bytes · Views: 92

are you looking for vhdl code or a circuit diagram? make a simple mod 4 counter(you'll need two flipflops, right?). Connect the reset of both the flip flops to the output of an and gate. The AND gate will have inputs as the two outputs of the flipflops. Take the output from the second flipflop. And you have your solution
 

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