help for frequency divider

[zhangpengyu]

Hi
How can I divide frequency by odd numbers(such as 3)?



zhpy

 

[IanP]

For division by 3 use 2 JK flip-flops or for other divisions go to frequency dividers site:
**broken link removed**
Regards,
IanP

 

[zysmith]

u can design a modulo-3 counter if duty cycle don't require

 

[dolby.yang]

if you want to get a %50 duty cycle clk,you must use your source clk's posedge and negtive edge!

 

[artem]

dolby.yang is right. If 50 % duty is required
- extract pos and neg edge from input signal,
- OR them,
- give ORed output to counter with parallel loading diving by 3
- and then get the 50 percent duty by normal D trigger dividing by 2 .

 

[claint]

SNUG paper

 

[zhdwx]

please look up the book about the divider,this way is simple and better.

 

[eeeraghu]

You Can achieve the frequency divider by any odd number, but u have a no 50% duty cycle, but still u can achieve a 50 % duty cycle but it is complex in hardware wise u have to concentrate on both positve as well as negative edge of the clock, so need positive and negative edge triggered flip flops.
Regards
Raghu

 

[tom123]

for example 3, following is sample code:

always @(posedge clk or negedge rst_n)
begin
if (rst_n)
counter <= #1 2'h0;
else if (counter == 2'h2)
counter <= #1 2'h0;
else
counter <= #1 counter + 2'h1;
end

assign clk_divided_by_3 = counter[1];

Hi
How can I divide frequency by odd numbers(such as 3)?



zhpy

 

[JesseKing]

If duty cycle is require, both posedge and negedge will be used to generate you 3 frequency divider.

 

[HO_220]

For divider by odd:
you can use a PLL for obtaining any freq.
Bests.

 

[Karthikeya]

hi
i feel it is possible using a 3 bit ring counter....does ne1 agree???