Help with reseting counet

Altera_Forum · ‎09-03-2015

Hey, I've written a simple counter code

When the cnt = 5 the

signal std_logic_vector Inc +'1'

Now I want you end this process when

It's equal to "1111";

Everytime I try to end this I see In the waveform simulation the it just beginning from" 0000" again.

What can I do?

Altera_Forum · ‎09-03-2015

Why not post the code and be a more descriptive of the problem.

Altera_Forum · ‎09-03-2015

Entity VCO is

Port(sw:in std_logic;

Clk:in std_logic;

Bit_4: out std_logic_vectot(3 downto 0));

End entity;

Architecture behave of VCO is

Signal cnt: integer range 0 to 50000000:=0;

Signal f_out: std_logic_vector(3 downto 0):=x"0";

Begin

Process (clk)

Begin

If sw = '1' then

If clk 'event and clk=' 1' then

Cnt<=cnt+1;

If cnt=5 then

F_Out<=f_out+'1';

Cnt<=0;

Elsif cnt=5 then

If f_out="1111" then

F_out<="1111"

Cnt<=0;

End if;

Elsif ='0' then

Cnt<=0;

F_out<="ZZZZ";

End if;

End process;

Bit_4<=f_out;

End;

Altera_Forum · ‎09-03-2015

I want when f_out="1111"

The counter will stop end remain on "1111"

Instead of looping end start counting from 0000 again

Altera_Forum · ‎09-03-2015

What is F_F_out - it's not declared in your code.

Assuming this is a typo - then your code will never have f_out locked at "1111" because the only situation where you check for "1111" also resets cnt.

maybe you need the

if f_out = "1111" then

To have the highest prirotiy.

On a side note - why have you got the sw signal as an asynchronous enable? this is bad practice - it should be a synchronous enable.

Altera_Forum · ‎09-03-2015

I've tried this it didn't work..

It shows me in the simulation the same thing

And I don't have sw signal

It is a toggle sw for on/off use

Altera_Forum · ‎09-03-2015

Tried what? I dont see any new code.

Have you tried this:


Process (clk) 
Begin
    If clk 'event and clk=' 1' then
        Cnt<=cnt+1;
        if f_out /= "1111" then
            If cnt=5 then
                F_Out<=f_out+'1';
                Cnt<=0;
            Elsif cnt=5 then
                If f_out="1111" then
                    F_F_out<="1111"
                    Cnt<=0;
                End if;
            End if;
        end if;
    End if;
End process;

Altera_Forum · ‎09-03-2015

--- Quote Start ---

Tried what? I dont see any new code.

Have you tried this:


Process (clk) 
Begin
    If clk 'event and clk=' 1' then
        Cnt<=cnt+1;
        if f_out /= "1111" then
            If cnt=5 then
                F_Out<=f_out+'1';
                Cnt<=0;
            Elsif cnt=5 then
                If f_out="1111" then
                    F_F_out<="1111"
                    Cnt<=0;
                End if;
            End if;
        end if;
    End if;
End process;

--- Quote End ---

Thanks man! It worked

I don't know how I didn't think about "/=" inequality