Numarator - cod de asamblare

Numarator

Codul

library ieee;

use ieee.std_logic_1164.all;

entity num4 is

port (clk : in std_logic;

rst : in std_logic;

num : buffer std_logic_vector(3 downto 0));

end num4;

architecture simul of num4 is

function inc_bv (a: std_logic_vector) return std_logic_vector is

variable r: std_logic_vector (a'range);

variable c: std_logic;

begin

c := '1';

for i in a'range loop

r(i) := a(i) xor c;

c := a(i) and c;

end loop;

return r;

end inc_bv;

begin

process (clk, rst)

begin

if (rst = '1') then

num <= (others => '0');

elsif (clk'event and clk = '1') then

num <= inc_bv (num);

end if;

end process;

end simul;

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