1、VHDL编程部分。代码如下：LIBRARY IEEE;USE IEEE.STD娄多骋能_LOGIC_1164.ALL;USE IEEE.STD_LOGIC_UNSIGNED.ALL;ENTITY AL炽扃仄呦U181 ISPORT (S : IN STD_LOGIC_VECTOR(3 DOWNTO 0 );A : IN STD_LOGIC_VECTOR(7 DOWNTO 0);B : IN STD_LOGIC_VECTOR(7 DOWNTO 0);F : OUT STD_LOGIC_VECTOR(7 DOWNTO 0);M : IN STD_LOGIC;CN : IN STD_LOGIC;CO : OUT STD_LOGIC );END ALU181;ARCHITECTURE behav OF ALU181 ISSIGNAL A9 : STD_LOGIC_VECTOR(8 DOWNTO 0);SIGNAL B9 : STD_LOGIC_VECTOR(8 DOWNTO 0);SIGNAL F9 : STD_LOGIC_VECTOR(8 DOWNTO 0);BEGINA9 <= '0' & A ; B9 <= '0' & B ;PROCESS(M,CN,A9,B9)BEGINCASE S ISWHEN "0000" => IF M='0' THEN F9<=A9 + CN ; ELSE F9<=NOT A9;END IF;WHEN "0001" => IF M='0' THEN F9<=(A9 or B9) + CN ; ELSE F9<=NOT(A9 OR B9);END IF;WHEN "0010" => IF M='0' THEN F9<=(A9 or (NOT B9))+ CN ; ELSE F9<=(NOT A9) AND B9;END IF;WHEN "0011" => IF M='0' THEN F9<= "000000000" - CN ; ELSE F9<="000000000";END IF;WHEN "0100" => IF M='0' THEN F9<=A9+(A9 AND NOT B9)+ CN ; ELSE F9<=NOT (A9 AND B9);END IF;WHEN "0101" => IF M='0' THEN F9<=(A9 or B9)+(A9 AND NOT B9)+CN ; ELSE F9<=NOT B9;END IF;WHEN "0110" => IF M='0' THEN F9<=(A9 - B9) - CN ; ELSE F9<=A9 XOR B9;END IF;WHEN "0111" => IF M='0' THEN F9<=(A9 or (NOT B9)) - CN ; ELSE F9<=A9 and (NOT B9);END IF;WHEN "1000" => IF M='0' THEN F9<=A9 + (A9 AND B9)+CN ; ELSE F9<=(NOT A9)and B9;END IF;WHEN "1001" => IF M='0' THEN F9<=A9 + B9 + CN ; ELSE F9<=NOT(A9 XOR B9);END IF;WHEN "1010" => IF M='0' THEN F9<=(A9 or(NOT B9))+(A9 AND B9)+CN ; ELSE F9<=B9;END IF;WHEN "1011" => IF M='0' THEN F9<=(A9 AND B9)- CN ; ELSE F9<=A9 AND B9;END IF;WHEN "1100" => IF M='0' THEN F9<=(A9 + A9) + CN ; ELSE F9<= "000000001";END IF;WHEN "1101" => IF M='0' THEN F9<=(A9 or B9) + A9 + CN ; ELSE F9<=A9 OR (NOT B9);END IF;WHEN "1110" => IF M='0' THEN F9<=((A9 or (NOT B9)) +A9) + CN ; ELSE F9<=A9 OR B9;END IF;WHEN "1111" => IF M='0' THEN F9<=A9 - CN ; ELSE F9<=A9 ;END IF;WHEN OTHERS => F9<= "000000000" ;END CASE;END PROCESS;F<= F9(7 DOWNTO 0) ; CO <= F9(8) ;END behav;
2、编译
3、波形仿真
