Example of for-loop Statement (VHDL) - Example of for-loop Statement (VHDL) - 2022.2 English - UG901

Vivado Design Suite User Guide: Synthesis (UG901)

Document ID
UG901
Release Date
2022-11-16
Version
2022.2 English

Filename: for_loop.vhd

--

-- For-loop example

--

-- for_loop.vhd

--

library IEEE;

use IEEE.std_logic_1164.all;

use IEEE.std_logic_unsigned.all;

entity for_loop is

port(

a     : in  std_logic_vector(7 downto 0);

Count : out std_logic_vector(2 downto 0)

);

end for_loop;

architecture behavior of for_loop is

begin

process(a)

variable Count_Aux : std_logic_vector(2 downto 0);

begin

Count_Aux := "000";

for i in a'range loop

if (a(i) = '0') then

Count_Aux := Count_Aux + 1;

end if;

end loop;

Count <= Count_Aux;

end process;

end behavior;