compare.vhd

来自「自己刚写的一个RISC的cpu」· VHDL 代码 · 共 32 行

library ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_arith;
use ieee.std_logic_unsigned.all;

entity compare is
       port(comp_c:in std_logic_vector(2 downto 0);
            comp_in1:in std_logic;
            comp_in2:in std_logic;
            comp_out:out std_logic
              );
end compare;
architecture one of compare is
    signal compare_temp:std_logic_vector(2 downto 0);
       begin
         process(comp_in1,comp_in2)
           begin         
                 if(comp_in1=comp_in2) then compare_temp<="010";
             elsif (comp_in1>comp_in2) then compare_temp<="100";
                else compare_temp<="001";            
            end if;
          end process;

        process(compare_temp,comp_c)
          begin
            if(comp_c=compare_temp) then comp_out<='1';
                 else comp_out<='0';
            end if;
       end process;

 end one;