Give me some advice about this circuit

[owen_li]

Now, give you an input. It is 32 bit width. Ask you give the zero count from the beginning of the data. For example. If the input is 32'b0000_0001xxxxxx, then the
output is 7. If the input is 32'b0000_00001xxxxx, then the output is 8. Please give me some advice. Thank you!

 

[avimit]

process(data)
variable count_var : std_logic_vector(4 downto 0);
begin
count_var := (others => '0');
for i in 31 downto 0 loop
  if(data(i) = '0') then
    count_var := count_var + 1
  else
    exit
  end if;
end loop;
count_sig <= count_var;
end process;

Hope It helps,
Kr,
Avi
http://www.vlsiip.com

 

[vlsi_freak]

Hi ..

Excellent code from Amit.

But I am making a small change to the above code.

Insted of " for i in 31 downto 0 loop;

i make it as "for i in 0 to 31 loop;"

Hope it helps.

Thanks

 

[manasiw2]

Hi,
what if all the zeroes in the input are to be counted?
I think removing 'exit' will do.
Whats say?