ococ 发表于 2014-5-19 18:47 
贴个你modelsim仿真的图
LIBRARY ieee;
USE ieee.std_logic_1164.all;
USE ieee.std_logic_unsigned.all;
entity addr_a is
port( clk,load:in std_logic;
m:in std_logic_vector(7 downto 0);
addr:buffer std_logic_vector(23 downto 0)
);
end;
ARCHITECTURE one of addr_a is
signal dlta:std_logic_vector(23 downto 0);
signal sum:std_logic_vector(23 downto 0):=(others=>'0');
begin
process(load,m)
begin
if load'event and load='1' then
dlta(7 downto 0)<=m;
end if;
dlta(23 downto 8) <=(others=>'0');
end process;
sum <= dlta + sum;
process(clk,sum)
begin
if clk'event and clk='1' then
addr<=sum;
end if;
end process;
end one;
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