example transfer 50mhz to hz

[LEDN]

an you give couple example and explain how can you do it

I want to convert 50mhz to 9000hz 
Given CLOCK_50 = 50mhz ( in pin planner)
I want to convert by using something like this 

Example code:
module Convert(CLOCK_50);

input CLOCK_50;

reg [   ] Q;

reg  CLOCK_9000;

always @ (posedge  CLOCK_50) begin
//code here convert CLOCK_50 --> CLOCK_9000hz

end
always @(posedge CLOCK_9000hz)
/// i want to this always already 9000hz.
end

@de10-lite

 @verilog 

[sstrell]

Don't do this in code.  Use a PLL instead.

[ak6dn]

Well, 50MHz is not an integral multiple of 9KHz, so the question is how close do you need to be?

1) You could just divide 50,000,000 Hz by 5,556 and get 8999.28Hz. That is within 0.008%.

2) If you need to get to exactly 9,000Hz, then you need to use a PLL to do a multiply by 9.
    So 9*50MHz is 450MHz, divided by 50,000 is exactly 9,000Hz.

Depends on your exact requirement.

[LEDN]

maybe we have wrong idea.

my idea is i want to understand the code in the always @ (posedge  CLOCK_50) begin.

For example i wrote this code

module Convert(CLOCK_50);

input CLOCK_50;

reg [ 25: 0 ] Q;  

reg  CLOCK = 0;

always @ (posedge  CLOCK_50) begin
 if (Q == 25000000 ) begin 
Q <= 0;
CLOCK = !CLOCK ;
end
else
Q <= QQ + 1;
end

So i have reg [25:0] Q.  is this Q is 25 bit???
if(Q==25000000) // is if Q == 25bit then the CLOCK = 1 hz? or 1mhz ? i dont know .

This main question i have to understand in this alway @(posedge clock_50) begin  clock_50 = 50mhz. 
i want to understand how the code work in here. if i want to get 50000000/9000 = 5555.5  or 5556
so if i want to get 9000 then i ran 
If(Q==5556)
Q<=0

CLOCK <=1;  // this is now clock == 9000hz?

[ak6dn]

First a reg [25:0] value is a 26 bit binary number, and can have a value between 0 and 2^26-1, or 67,108,863.

@(posedge clock_50) is going to toggle every 20ns (assuming a 50MHz clock input). So each count will be 20ns.

5556 * 20ns will be 111.12usec, or 8999.28 KHz.

Do you have access to a graphical verilog simulator as part of your Quartus install? That may make it easier for you to understand.

[Nurina]

Hello,

Does the above reply answer your question?

Regards,

Nurina

[Nurina]

Hello,

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