basma wrote:
> i search but didn't find any thing helpe me.
What did you search for?

> any idea plz....
This is exaclty what you need (according to your requirements):

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library IEEE;

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use IEEE.STD_LOGIC_1164.ALL;

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use IEEE.math_real.ALL;

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entity findmax is

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  port (

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    clk : in std_logic;

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    clr : in std_logic;

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    din : in real;

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    max : out real;

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  );

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end findmax ;

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architecture Behavioral of findmax is

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signal m : real := 0.0;

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begin

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  process begin

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    wait until rising_edge(clk);

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      if clr='1' then

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        m <= 0.0;

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      elsif din>m then

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        m <= din;

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      end if;    

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    end if;

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  end process;

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  max <= m;

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end Behavioral;

Of course I already added a clock and a clear signal. Otherwise (without 
clock and clear) it would look much less complicated:

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library IEEE;

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use IEEE.STD_LOGIC_1164.ALL;

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use IEEE.math_real.ALL;

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entity findmax is

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  port (

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    din : in real;

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    max : out real;

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  );

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end findmax ;

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architecture Behavioral of findmax is

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signal m : real := 0.0;

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begin

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  m <= din when m<din else m;

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  max <= m;

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end Behavioral;

jeff wrote:
> No semicolon after max: out real
Indeed, but I think that little syntax flaw will not be the biggest 
problem here...

thanks a lot lkmiller ,but i want to know how can i gave the floating 
numbers to xilinx simulation program

Basma Hassan wrote:
> but i want to know how can i gave the floating numbers to xilinx
> simulation program
And where do the numbers come from?
Where are the numbers generated and/or stored?

Lothar Miller wrote:
> Basma Hassan wrote:
>> but i want to know how can i gave the floating numbers to xilinx
>> simulation program
> And where do the numbers come from?
> Where are the numbers generated and/or stored?

i mean to test the code i should gave numbers from test bench waveform 
instead of write test bench .

Basma Hassan wrote:
> i mean to test the code i should gave numbers from test bench waveform
> instead of write test bench .
I do not understand the problem...  :-/
Please write at least 5 sentences that describe your task (including 
answers to my previous questions).

if i want to find the max value in 
(0.3251,0.2536,0.2147,0.3669.............)
how to test it and find the max value

Basma Hassan wrote:
> if i want to find the max value in
> (0.3251,0.2536,0.2147,0.3669.............)
Do you remember my unanswered questions?
Lothar Miller wrote:
> And where do the numbers come from?
> Where are the numbers generated and/or stored?

Basma Hassan wrote:
> how to test it and find the max value
Show the definition of your data at least. Is it an array of floating 
point numbers? How is this array defined?