Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

Counting the position of ones in a binary vector

I want to design a combinatorial circuit for an fpga which will count the position of ones in a 16 bit vector. eg1 if vector is 16'b0000_0000_0011_0101 then output should be 64'h0000_0000_0000_5...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

only as guide, not tested 


process(data_in)
begin
for i in 0 to 15 loop
    if data_in(i) = '0' then
          data_out(i*4:i*4+3) <= "0000";
     else
          data_out(i*4:i*4+3) <= std_logic_vector(to_unsigned(i,4));
     end if;
end loop;
end process;