am2901_comps.vhd

4位MCU AM2901的完整VHDL程序

library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;

package am2901_comps is
      component ram_regs port(
              clk,rst:in std_logic;
              a,b,f:in unsigned(3 downto 0);
              dest_ctl:in std_logic_vector(2 downto 0);
              ram0,ram3:inout std_logic;
              ad,bd:buffer unsigned(3 downto 0));
      end component;
      
      component q_reg port(
              clk,rst:in std_logic;
              f:in unsigned(3 downto 0);
              dest_ctl:in std_logic_vector(2 downto 0);
              qs0,qs3:inout std_logic;
              q:buffer unsigned(3 downto 0));
      end component;

      component src_op port(
              src_ctl:in std_logic_vector(2 downto 0);
              d,ad,bd,q:in unsigned(3 downto 0);
              r,s:buffer unsigned(3 downto 0));
      end component;

      component alu port(
              r,s:in unsigned(3 downto 0);
              c_n:in std_logic;--carry or borrow
              alu_ctl:in std_logic_vector(2 downto 0);
              f:buffer unsigned(3 downto 0);
              g_bar,p_bar:buffer std_logic;
              c_n4:buffer std_logic;
              ovr:buffer std_logic);
      end component;

      component out_mux port(
              ad,f:in unsigned(3 downto 0);
              dest_ctl:in std_logic_vector(2 downto 0);
              oe:in std_logic;
              y:buffer unsigned(3 downto 0));
      end component;
end am2901_comps;