comp.vhd

来自「16位CUPIP核,完全运行的好的东西,可以直接拿来用的!」· VHDL 代码 · 共 49 行

library IEEE;
use IEEE.std_logic_1164.all;
use IEEE.std_logic_arith.all;
use IEEE.std_logic_unsigned.all;
use work.cpu_lib.all;
entity comp is
port( a, b : in bit16;
	sel : in t_comp;
	compout : out std_logic);
end comp;
architecture rtl of comp is
begin
compproc: process(a, b, sel)
begin
case sel is
when eq =>if a = b then
	compout <= '1' after 1 ns;
	else
	compout <='0' after 1 ns;
end if;
when neq =>if a /= b then
	compout <= '1' after 1 ns;
	else
	compout <= '0' after 1 ns;
end if;
when gt =>if a > b then
	compout <= '1' after 1 ns;
	else
	compout <= '0' after 1 ns;
end if;
when gte =>if a >= b then
	compout <= '1'after 1 ns;
	else
	compout <= '0' after 1 ns;
end if;
when lt =>if a < b then
	compout <= '1' after 1 ns;
	else
	compout <= '0' after 1 ns;
end if;
when lte =>if a <= b then
	compout <= '1' after 1 ns;
	else 
	compout <= '0' after 1 ns;
end if;
when others =>compout <= '0' after 1 ns;
end case;
end process;
end rtl;