4 Bit Braun Multiplier VHDL Code

This page of VHDL source code section covers 4 Bit Braun Multiplier VHDL Code.

4 Bit Braun Multiplier VHDL Code

entity braun_multiplier4 is
port ( a : in std_logic_vector (3 downto 0);
b : in std_logic_vector (3 downto 0);
p : out std_logic_vector (7 downto 0));
end braun_multiplier4;
architecture behavioral of braun_multiplier4 is
signal s1,s2,s3,s4 :std_logic_vector (3 downto 0);
signal f1,f2,f3,f4 :std_logic_vector (4 downto 0);
component and21
port( a : in std_logic;
b : in std_logic;
c : out std_logic);
componentcomponent f_adder
port ( a : in std_log ic;
b : in std_logic;
c : in std_logic;
sum : out std_logic;
carry : out std_logic);
end component;
g1: for i in 0 to 3 generate
a1: and21 port map (b(0),a(i),s1(i));
p(0) <=s1(0);
end generate;
g2: for j in 0 to 3 generate
a2: and21 port map (b(1),a(j),s2(j));
end generate;
fa1: f_adder port map (s1(1),s2(0),'0',p(1),f1(0));
fa2: f_adder port map (s1(2),s2(1),'0',f1(1),f1(2));
fa3: f_adder port map (s1(3),s2(2),'0',f1(3),f1(4));
g3: for k in 0 to 3 generate
a3: and21 port map (b(2),a(k),s3(k));
end generate;
fa4: f_adder port map (s3(0),f1(0),f1(1),p(2),f2(0));
fa5: f_adder port map (s3(1),f1(2),f1(3),f2(1),f2(2));
fa6: f_adder port map (s3(2),f1(4),s2(3),f2(3),f2(4));

g4: for l in 0 to 3 generate
a3: and21 port map (b(3),a(l),s4(l));
end generate;
fa7: f_adder port map (s4(0),f2(0),f2(1),p(3),f3(0));
fa8: f_adder port map (s4(1),f2(2),f2(3),f3(1),f3(2));
fa9: f_adder port map (s4(2),f2(4),s3(3),f3(3),f3(4));
fa10: f_adder port map ('0',f3(0),f3(1),p(4),f4(0));
fa11: f_adder port map (f4(0),f3(2),f3(3),p(5),f4(1));
fa12: f_adder port map (f4(1),f3(4),s4(3),p(6),p(7));
end behavioral;


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