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Altera_Forum's avatar
Altera_Forum
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10 years ago

Comparison between old value and new value

Hi All, Its a very simple question but I am unable to do that. Below is my code. I want to store signal data_o_new to signal data_o_old and then compare these signals with each other and do inc...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
10 years ago

then why not do something like this? 


signal value_ref : unsigned(Nbits-1 downto 0);
signal output_ref : unsigned(Nbits-1 downto 0);
process(clk)
begin
  if rising_edge(clk) then
    value_ref <= new_value;
    if value_ref > output_ref then
      output_ref <= output_ref +1;
    elsif value_ref < output_ref then
      output_ref <= output_ref -1;
    end if;
  end if;
end process;
op <= output_ref;

Here, the output never changes dramatically, but is gradually pulled towards your new value.