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n-bit multiplier vhdl code
library ieee;
use ieee.std_logic_1164.all;
entity generic_mult is
generic (N: integer; M: integer);
port ( a : in std_logic_vector(N-1 downto 0);
b : in std_logic_vector(M-1 downto 0);
prod : out std_logic_vector(M+N-1 downto 0) );
end entity generic_mult;
architecture behavioral of generic_mult is
-- Components
component mult is
port (
a : in std_logic;
b : in std_logic;
pin : in std_logic;
cin : in std_logic;
pout : out std_logic;
cout : out std_logic );
end component;
-- Signals
type mem_word is array (0 to M-1) of std_logic_vector(N-1 downto 0);
signal cin : mem_word;
signal cout : mem_word;
signal pin : mem_word;
signal pout : mem_word;
begin
m_loop: for i in 0 to M-1 generate
n_loop: for j in 0 to N-1 generate
mult_inst : mult
port map (
a => a(j),
b => b(i),
pin => pin(i)(j),
cin => cin(i)(j),
pout => pout(i)(j),
cout => cout(i)(j) );
end generate;
end generate;
cin_init: for j in 0 to N-1 generate
cin(0)(j) <= '0';
end generate;
cin_mloop: for i in 1 to M-1 generate
cin_nloop: for j in 0 to N-2 generate
cin(i)(j) <= pout(i-1)(j+1);
end generate;
cin(i)(N-1) <= cout(i-1)(N-1);
end generate;
pin_mloop: for i in 0 to M-1 generate
pin(i)(0) <= '0';
pin_nloop: for j in 1 to N-1 generate
pin(i)(j) <= cout(i)(j-1);
end generate;
end generate;
prod_loop: for j in 0 to M-1 generate
prod(j) <= pout(j)(0);
end generate;
prod(M+N-2 downto M) <= pout(M-1)(N-1 downto 1);
prod(M+N-1) <= cout(M-1)(N-1);
end behavioral;
Source: electronics.stackexchange.com
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