sir thank you for your reply on radix-4 booth multiplier.it help me alot but sir i am not able to run its VHDL program.it show me an error.our teachers r also not able to rectify that error.so i have only one solution and that is you.please sir help me either send me the rectified program or kindly suggest me some other websit by which i am able to complete my project on radix-4 booth multiplier.

the program is as follow : (if needed)


library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use IEEE.STD_LOGIC_ARITH.ALL;
use IEEE.STD_LOGIC_SIGNED.ALL;
use ieee.numeric_std.all;
---- Uncomment the following library declaration if instantiating
---- any Xilinx primitives in this code.
--library UNISIM;
--use UNISIM.VComponents.all;
entity booth_encoder is
-- generic(N : integer:=8);
Port ( a : in std_logic_vector(7 downto 0);
arg : in std_logic_vector(2 downto 0);
pprod : out std_logic_vector(15 downto 0));
end booth_encoder;
architecture Behavioral of booth_encoder is
function encoder(arg1: std_logic_vector(2 downto 0);datatd_logic_vector(7
downto 0))
return std_logic_vector is
variable temp,temp1,temp2: std_logic_vector(8 downto 0);
variable sign: std_logic;
begin
case arg1 is
when "001"|"010" =>
if data <0 then
temp:='1'& data;
else
temp:='0'&data;
end if;
when "011" =>
if data<0 then
temp1:='1'&data;
temp:=temp1(7 downto 0)&'0';
else
temp:='0'&data(6 downto 0)&'0';
end if ;
when "100" =>
if data<0 then
temp1:='1'&data;
temp2:=(not temp1)+"000000001";
temp:=(temp2(7 downto 0)&'0');
else
temp1:='0'&data;
temp2:=(not temp1)+"000000001";
temp:=(temp2(7 downto 0)&'0');
end if;
when "101"|"110" =>
if data < 0 then
temp1:='1'&data;
temp:=not(temp1)+"000000001";
else
temp1:='0'&data;
temp:=(not temp1)+"000000001";
end if;
when others =>
temp:="000000000";
--"(others=>'0');
end case;
return temp;
end encoder;
signal s1: std_logic_vector(8 downto 0);
signal s2: std_logic;
begin
s1<=encoder(arg,a);
--s2<=s1(8);
--pprod<=s2&s2&s2&s2&s2&s2&s2&s2&s1(7 downto 0);
pprod<=sxt(s1,16);
end Behavioral;



sir i am waiting for your reply.

please post here http://objectmixvhdl/ they are expert of this program
i hope they can solve your problem